Carrier Heat Pump 50PTH User Manual

AQUAZONE™

50PTH, PTV, PTD026-072

Two-Stage Water Source Heat Pumps

with PURON^®Refrigerant (R-410A)

Installation, Start-Up, and Service Instructions

Page

CONTENTS

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-38

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 34

Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 34

Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 34

Unit Start-Up with WSHP Open Controls . . . . . . . . 36

Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 38

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 38

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-42

Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Units with Aquazone™ Complete C Control . . . . . 39

Units with Aquazone Deluxe D Control . . . . . . . . . . 39

Units with WSHP Open Multiple Protocol. . . . . . . . 39

Page

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . .1,2

GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Step 1 — Check Jobsite. . . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• STORAGE

• PROTECTION

• INSPECT UNIT

Step 3 — Locate Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

• FIELD CONVERSION OF DISCHARGE AIR

Step 4 — Mount the Unit . . . . . . . . . . . . . . . . . . . . . . . . . 9

• HORIZONTAL UNIT

• VERTICAL UNITS

Step 5 — Check Duct System . . . . . . . . . . . . . . . . . . . . 9

• SOUND ATTENUATION

• EXISTING DUCT SYSTEM

COMPLETE C AND DELUXE D BOARD

Step 6 — Install Condensate Drain . . . . . . . . . . . . . . . 9

• HORIZONTAL UNIT

SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42,43

Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

WSHP Open Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 43

Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Aquazone Deluxe D Control LED Indicators . . . . . 43

• VERTICAL UNITS

• VENTING

Step 7 — Pipe Connections . . . . . . . . . . . . . . . . . . . . . 10

• WATER LOOP APPLICATIONS

• GROUND-WATER APPLICATIONS

• GROUND-LOOP APPLICATIONS

• INSTALLATION OF SUPPLY AND RETURN HOSE

KIT

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44,45

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Water Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 44

Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Compressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Fan Motors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 44

Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 45

Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 45

Replacing the WSHP Open Controller’s

Step 8 — Wire Field Power Supply . . . . . . . . . . . . . . 12

• POWER CONNECTION

• SUPPLY VOLTAGE

• 208-VOLT OPERATION

• 460-VOLT OPERATION

• WSHP OPEN WIRING

Step 9 — Wire Field Controls. . . . . . . . . . . . . . . . . . . . 25

• THERMOSTAT CONNECTIONS

• WATER FREEZE PROTECTION

• AIR COIL FREEZE PROTECTION

• ACCESSORY CONNECTIONS

• WATER SOLENOID VALVES

Step 10 — Operate ECM Interface Board . . . . . . . . 27

• STANDALONE — NO DDC CONTROLS

• WSHP OPEN CONTROLS

Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 45-53

Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

WSHP Open Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Thermostatic Expansion Valves . . . . . . . . . . . . . . . . . . 46

Stopped or Malfunctioned ECM Motor. . . . . . . . . . . . 50

Moisture Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29,30

System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FIELD SELECTABLE INPUTS. . . . . . . . . . . . . . . . . 30-33

Complete C Control Jumper Settings. . . . . . . . . . . . 30

Deluxe D Control Jumper Settings . . . . . . . . . . . . . . 30

Complete C Control DIP Switches. . . . . . . . . . . . . . . 30

Deluxe D Control DIP Switches. . . . . . . . . . . . . . . . . . 30

Units with Modulating Hot Water Reheat

(HWR) Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

• STANDALONE — NO DDC CONTROLS

• WSHP OPEN CONTROLS

APPENDIX A — WSHP OPEN SCREEN

CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 54-59

50PTH,PTV,PTD START-UP

CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1, CL-2

IMPORTANT: Read the entire instruction manual before

starting installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical

• HWR APPLICATION CONSIDERATIONS

• HWR COMPONENT FUNCTIONS

Deluxe D Control Accessory

Relay Configurations. . . . . . . . . . . . . . . . . . . . . . . . . 32

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500079-01 Printed in U.S.A. Form 50PT-4SI Pg 1 7-10 Replaces: 50PT-3SI

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8. Provide an unobstructed path to the unit within the closet

or mechanical room. Space should be sufficient to allow

removal of unit if necessary.

9. Provide ready access to water valves and fittings, and

screwdriver access to unit side panels, discharge collar,

and all electrical connections.

10. Where access to side panels is limited, pre-removal of the

control box side mounting screws may be necessary for

future servicing.

INSPECT UNIT — To prepare the unit for installation, com-

plete the procedures listed below:

1. Compare the electrical data on the unit nameplate with

ordering and shipping information to verify that the

correct unit has been shipped.

2. Do not remove the packaging until the unit is ready for

installation.

3. Verify that the unit’s refrigerant tubing is free of kinks or

dents, and that it does not touch other unit components.

STORAGE — If the equipment is not needed immediately at

the jobsite, it should be left in its shipping carton and stored in a

clean, dry area of the building or in a warehouse. Units must be

stored in an upright position at all times. If carton stacking is

necessary, stack units a maximum of 3 high. Do not remove

any equipment from its shipping package until it is needed for

installation.

PROTECTION — Once the units are properly positioned on

the jobsite, cover them with either a shipping carton, vinyl film,

or an equivalent protective covering. Cap open ends of pipes

stored on the jobsite. This precaution is especially important in

areas where painting, plastering, or spraying of fireproof mate-

rial, etc. is not yet complete. Foreign material that accumulates

within the units can prevent proper start-up and necessitate

costly clean-up operations.

4. Inspect all electrical connections. Be sure connections are

clean and tight at their terminations.

5. Loosen compressor bolts until the compressor rides freely

on springs. Remove shipping restraints.

6. Remove the four / in. shipping bolts from compressor

support plate (two bolts on each side) to maximize vibra-

tion and sound alternation.

CAUTION

Failure to remove shipping brackets from spring-mounted

compressors will cause excessive noise and could cause

component failure due to added vibration.

7. Remove any blower support cardboard from inlet of the

blower.

8. Locate and verify any accessory kit located in compressor

and/or blower section.

9. Remove any access panel screws that may be difficult to

remove once unit is installed.

Before installing any of the system components, be sure to

examine each pipe, fitting, and valve, and remove any dirt or

foreign material found in or on these components.

CAUTION

DO NOT store or install units in corrosive environments or

in locations subject to temperature or humidity extremes

(e.g., attics, garages, rooftops, etc.). Corrosive conditions

and high temperature or humidity can significantly reduce

performance, reliability, and service life. Always move

units in an upright position. Tilting units on their sides may

cause equipment damage.

Table 1 — Physical Data — 50PTH, PTV, PTD026-072 Units

UNIT 50PTH, PTV, PTD

COMPRESSOR (1 each)

FACTORY CHARGE R-410A (oz)

026

038

049

Two-Stage, Scroll

064

072

144

156

ECM FAN MOTOR AND BLOWER

Fan Motor Type

VAR

11x10

VAR

11x10

VAR

11x10

Fan Motor (Hp)

Blower Wheel Size (D x W) (in.)

9 x 7

11 x 10

COAXIAL COIL VOLUME (gal.)

WATER CONNECTION SIZE (FPT) (in.)

HWG CONNECTION SIZE (FPT) (in.)

.76

.92

1.24

1.56

VERTICAL

Air Coil

Dimensions (H x W) (in.)

Filter Standard — 1-in. Throwaway

(Qty — Size) (in.)

Weight (lb)

28 x 20

28 x 25

32 x 25

36 x 25

1 — 16 x 30

1 — 20 x 30

1 — 16 x 30

1 — 20 x 30

1 — 28 x 24

1 — 28 x 30

2 — 16 x 30

Operating

Packaged

266

276

327

337

416

426

443

453

443

453

HORIZONTAL

Air Coil

Dimensions (H x W) (in.)

Filter Standard — 1-in. Throwaway

(Qty — Size) (in.)

Weight (lb)

18 x 31

20 x 25

20 x 40

20 x 45

1 — 12 x 20

1 — 20 x 24

1 — 18 x 20

1 — 20 x 24

2 — 18 x 18

2 — 20 x 24

Operating

Packaged

266

276

327

337

416

426

443

453

443

453

LEGEND

ECM

HWG — Hot Water Generator

VAR Variable Speed

—

Electronically Commutated Motor

—

NOTE: All units have spring compressor mountings, TXV (thermostatic expan-

sion valve) expansion devices, and

and / -in. electrical knockouts.

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LEGEND

ASP

BSP

CAP

CSP

FPT

—

Alternate Service Panel

Blower Service Panel

Control Access Panel

Compressor Service Panel

Female Pipe Thread

Service

CSP

Front

Service Access

HWG — Hot Water Generator

HWR Hot Water Reheat

Access

Front

Service Access

Left Return

—

Power Supply

3/4” Knockout

Service Access

Right Return

1/2”

Knockout

1.6”

CSP

ASP

3.25”

Low Voltage

1/2” Knockout

CAP

Left

Discharge

Right

Discharge

Condensate

3/4” FPT

Condensate

3/4” FPT

Back

Discharge

Back

Discharge

Size

BSP

Blower

Outlet

BSP

Blower

Outlet

, 072

Y Configuration - Left Return/Back Discharge

P Configuration - Right Return/Back Discharge - Air Coil Opening

Blower

Outlet

BSP

Left

View

ASP

CSP

BSP

Right

View

Blower

Outlet

Front

W Configuration - Left Return/Right Discharge - Air Coil Opening

N Configuration - Right Return/Left Discharge - Air Coil Opening

Air Coil

1.1”

Air Coil

Right

View

CSP

ASP

Front

W Configuration - Left Return/Right Discharge - Air Coil Opening

N Configuration - Right Return/Left Discharge - Air Coil Opening

WATER

CONNEC-

TIONS (in.)

- UNITS

DISCHARGE CONNECTIONS (in.) RETURN CONNECTION

OVERALL CABINET

WATER CONNECTIONS (in.)

(in.)

ELECTRICAL

KNOCKOUTS (in.)

DUCT FLANGE INSTALLED

USING AIR COIL

OPENING (in.)

( 0.10 in.)

WITH HWR

50PTH

UNIT

/ -in. / -in. / -in.

Loop

Water

FPT

HWG

FPT

(in.)

Cond Cond Cond

(LH

rtn)

Supply Supply (RH

Height Width rtn)

Return Return

Width Height

Width Depth Height

Out

Low

Ext Power

Loop Loop

in D out E

(in.)

HWG HWG Cond-

Voltage Pump Supply

Out ensate

026

038

049

22.4

25.4

62.2

71.2

76.2

81.2

19.3

21.3

2.1 10.0 13.9 16.9

3.4 10.8 14.6 18.9

3.4 10.8 15.6 18.9

3.5

3.4

2.1 10.0

3.6

6.1

8.6

3.6 2.0 12.5

3.1 1.2 19.0

15.5 3.6 2.0 33.8

17.5 3.1 1.0 34.8

17.5 3.1 1.0 39.8

17.5 3.1 1.0 44.8

16.2 2.3 1.5

18.2 3.1 1.5

5.96 13.13 3.4

5.96 13.13 3.6

064,072 25.4

NOTES:

1. Condensate connection is stainless steel

AIRFLOW CONFIGURATION

in. female pipe thread (FPT).

2. Unit shipped with top and bottom filter rack and is not suitable for duct connection without

CODE

RETURN

Right

Left

DISCHARGE

Left

additional support.

3. Discharge flange is factory-installed.

4. Hanger kit is factory-installed.

5. Shaded areas are recommended service areas, not required.

6. Discharge can be modified in field. Return cannot be modified.

Back

Right

Left

Back

Fig. 1 — 50PTH026-072 Dimensional Data

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3/8” threaded rods

(by others)

FilterAccess

Return Air

(Ductwork

not shown)

Thermostat

Wiring

Field-supplied transition to

minimize pressure loss

Balancing Valve (field-

installed accessory)

Power Wiring

Stainless steel

braid hose

Supply Air

with integral

“J” swivel

Low Pressure Drop Water

Control Valve (optional)

(field-installed accessory)

Unit Power

Building

Loop

Flexible

Connection

Insulated supply duct with

at least one 90 degree elbow

to reduce air noise

Unit Power

Disconnect

(by others)

Water Out

Water In

Field-Supplied

Electric Heat

(if applicable)

(field-supplied)

Ball Valve with optional

Unit Hanger

integral P/Tplug (typical for supply

(field-installed

accessory)

(factory-

Aux Electric

and return piping) (field-installed accessory)

supplied)

Heat Disconnect

3/8” Threaded

Rod (by others)

Vibration Isolator

(white-compressor end

and red-blower end)

Washer

(by others)

Double Hex Nuts

(by others)

Integral hanger support-

pre-attached in factory

UNIT HANGER ISOLATION DETAIL

Fig. 2 — Typical Installation — 50PTH Unit

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LEGEND

Field-Installed

ASP

BSP

CAP

CSP

FPT

—

Alternate Service Panel

Blower Service Panel

Control Access Panel

Compressor Service Panel

Female Pipe Thread

High Voltage

Discharge Flange

(shipped loose inside

blower section)

Access Panels

Filter Bracket

HWG — Hot Water Generator

HWR

—

Hot Water Reheat

Low Voltage

Air Coil

ASP

BSP

CAP

2ʼ Service Access

CSP

Air Coil Side

K - Configuration - Right Return

/Top Discharge

J - Configuration - Left Return

/Top Discharge

(Top View)

2ʼ Service Access

Isometric View

1.00”

Air Coil

1.68”

Condensate

Power Supply

3/4” FPT

3/4”

HV Knockout

CAP

1.63”

1/2”

Knockout

1.18”

CSP

Low Voltage

1/2”

ASP

LV Knockout

CSP

Back

Front

K - Configuration - Right Return -

Air Coil Opening

J - Configuration - Left Return -

Air Coil Opening

Front View

(Right Side View)

(Left Side View)

WATER

CONNEC-

DISCHARGE CONNECTIONS (in.)

DUCT FLANGE INSTALLED

( 0.10 in.)

RETURN CONNECTION

USING AIR COIL OPENING

(in.)

OVERALL CABINET

(in.)

ELECTRICAL

KNOCKOUTS (in.)

WATER CONNECTIONS (in.)

TIONS (in.)

- UNITS

WITH HWR

50PTV

UNIT

/ -in.

Loop

Water

FPT

HWG

FPT

(in.)

Cond Cond Cond

(LH

rtn)

Supply Supply (RH

Width Depth rtn)

Return Return

Depth Height

Width Depth Height

Out

Low

Ext

Power

Loop Loop

in D out E

(in.)

HWG HWG Cond-

Voltage Pump Supply

Out ensate

026

038

049

22.4

25.4

25.6

30.6

48.5

50.5

54.5

58.5

2.1

3.4

10.0 13.9 16.9

10.8 15.6 18.9

7.8

2.1 10.0

5.96 13.13

3.6

6.1

8.6

7.2

6.4

5.8

6.3

14.0

18.0

14.0

18.0

4.9 2.2

5.3 2.2

21.1

26.1

27.2

31.2

35.2

1.0

064,

072

NOTES:

AIRFLOW CONFIGURATION

1. Condensate connection is stainless steel

in. female pipe thread (FPT).

2. Unit shipped with top and bottom filter rack and is not suitable for duct connection without

additional support.

3. Discharge flange is field-installed.

4. Shaded areas are recommended service areas, not required.

CODE

RETURN

Left

DISCHARGE

Top

Right

Fig. 3 — 50PTV Dimensional Data

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LEGEND

ASP

BSP

CAP

CSP

FPT

—

Alternate Service Panel

Blower Service Panel

Control Access Panel

Compressor Service Panel

Female Pipe Thread

HWG — Hot Water Generator

HWR

—

Hot Water Reheat

WATER

CONNEC-

TIONS (in.)

DISCHARGE CONNECTIONS (in.)

DUCT FLANGE INSTALLED

( 0.10 in.)

OVERALL CABINET

(in.)

ELECTRICAL

KNOCKOUTS (in.)

RETURN CONNECTION (in.)

USING AIR COIL OPENING

WATER CONNECTIONS (in.)

- UNITS

WITH HWR

50PTD

UNIT

Cond

/ -in.

Loop

HWG

Cond

Water

FPT

(in.)

(LH

rtn)

Supply Supply (RH

Width Depth rtn)

Return Return

Depth Height

Width Depth Height

Low

Ext

Power

Loop Loop

in D out E

(in.)

HWG HWG Cond-

In Out

Voltage Pump Supply

Out ensate

026

038

049

22.4

25.4

25.6

30.6

52.5

54.5

58.5

62.5

2.1 10.0 13.9 16.9

3.4 10.8 15.6 18.9

3.6

2.1 10.0

5.96 13.13

3.6

6.1

8.6

6.7 8.4

7.2 9.0

10.1

13.4

9.1

12.9

10.8 2.2

10.4 2.2

21.1

26.1

27.2

31.4

35.2

1.0

064,072 25.4

NOTES:

AIRFLOW CONFIGURATION

1. Condensate connection is stainless steel

in. female pipe thread (FPT).

2. Unit shipped with top and bottom filter rack and is not suitable for duct connection without

additional support.

3. Downflow unit does not have discharge flange, and is rated for zero clearance installation.

4. Shaded areas are recommended service areas, not required.

CODE

RETURN

Left

DISCHARGE

Bottom

Right

Fig. 4 — 50PTD Dimensional Data

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• Provide adequate clearance for filter replacement and

drain pan cleaning. Do not block filter access with pip-

ing, conduit or other materials. Refer to Fig. 1, 3, and 4

for dimensional data.

• Provide access for fan and fan motor maintenance and

for servicing the compressor and coils without removing

the unit.

• Provide an unobstructed path to the unit within the closet

or mechanical room. Space should be sufficient to allow

removal of the unit, if necessary.

• In limited side access installations, pre-removal of the

control box side mounting screws will allow control box

removal for future servicing.

Supply Air

Building

Loop

Flexible

Connection

Water

Out

Return

Air

Water

Balancing Valve

(field-installed

accessory)

Stainless steel

braid hose

with integral

“J” swivel

(field-installed

accessory)

Low Pressure

Drop Water

Control Valve

(optional)

Power

• Provide access to water valves and fittings and screw-

driver access to the unit side panels, discharge collar and

all electrical connections.

Thermostat

Wiring

(field-installed

accessory)

Ball Valve with optional

NOTE: Correct placement of the horizontal unit can play an

important part in minimizing sound problems. Since duct-

work is normally applied to these units, the unit can be

placed so that the principal sound emission is outside the oc-

cupied space in sound-critical applications. A fire damper

may be required by the local code if a fire wall is penetrated.

integral P/T plug

Compressor

Access Panel

(typical for supply and

return piping) (field-Installed

accessory)

NOTE: Ball valve with integral pressure temperature plug recommended.

Fig. 5 — Typical Vertical Installation — 50PTV Unit

FIELD CONVERSION OF DISCHARGE AIR — The dis-

charge air of the 50PTH horizontal units can be converted

between side and back discharge in the field. The conversion

process is the same for right and left return configurations. See

Fig. 7 and 8.

NOTE: It is not possible to convert return air between left or

right return models in the field due to refrigerant piping

changes.

Building

Loop

Flexible

Connection

Water

Out

Water

Stainless

Return

Air

steel

braid hose

with

Balancing Valve

(field-installed

accessory)

integral ”J”

swivel(field-

installed

accessory)

Water

Connection End

Low Pressure

Drop Water

Control Valve

(optional)

Return Air

Power

Thermostat

(field-installed

accessory)

Wiring

Supply

Duct

Compressor

Ball Valve with

optional integral

Access Panel

Flexible

P/T plug (typical for

supply and return

piping)(field-installed

accessory)

Connection

Side Discharge

Water

Connection End

Supply Air

NOTE: Ball valve with integral pressure temperature plug recommended.

Return Air

Drain

Fig. 6 — Typical Downflow Installation —

50PTD Unit

Step 3 — Locate Unit — The following guidelines

should be considered when choosing a location for a WSHP:

• Units are for indoor use only.

Back Discharge

Discharge Air

• Locate in areas where ambient temperatures are between

39 F and 102 F and relative humidity is no greater than

75%.

• Provide sufficient space for water, electrical and duct

connections.

• Locate unit in an area that allows easy access and removal

of filter and access panels.

• Allow enough space for service personnel to perform

maintenance.

Fig. 7 — Conversion Right Return,

Side Discharge to Back Discharge

Preparation — The unit should be on the ground in a well lit

area. Hung units should be taken down to ground level before

converting.

Side to Back Discharge Conversion

1. Remove screws to free the top and discharge panels. Set

screws aside for later use. See Fig. 8.

• Return air must be able to freely enter the space if unit needs

to be installed in a confined area such as a closet.

2. Remove the access panel and set aside.

• Install the unit on a piece of rubber, neoprene or other

mounting pad material for sound isolation. The pad

3. Lift the discharge panel from side of unit and rotate it to

back using care not to damage blower wiring.

4. Check blower wire routing and connections for undue

tension or contact with sheet metal edges. Re-route if

necessary.

should be at least / in. [10 mm] to / in. [13 mm] in

thickness. Extend the pad beyond all four edges of the

unit.

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5. Check refrigerant tubing for contact with other compo-

nents. Adjust if necessary.

6. Reinstall top panel using screws set aside in Step 1.

NOTE: Location for some screws at bottom of discharge

panel may have to be changed.

7. Manually spin fan wheel to check for obstructions.

Adjust for any obstruction found.

8. Replace access panel.

Remove Screws

Water

Connection End

Return Air

Fig. 9 — 50PTV Units Mounted With

Vibration Absorption Pad

Side Discharge

Water

Connection End

Step 5 — Check Duct System — Size the duct sys-

tem to handle the design airflow quietly.

Rotate

Return Air

NOTE: Depending on the unit, the fan wheel may have a ship-

ping support installed at the factory. This must be removed

before operating unit.

SOUND ATTENUATION — To eliminate the transfer of

vibration to the duct system, a flexible connector is recom-

mended for both discharge and return air duct connections on

metal duct systems. The supply and return plenums should in-

clude internal duct liner of fiberglass or be made of duct board

construction to maximize sound attenuation of the blower.

Installing the WSHP unit to uninsulated ductwork in an uncon-

ditioned space is not recommended since it will sweat and

adversely affect the unit’s performance.

Move to Side

Replace Screws

Water

Connection End

To reduce air noise, at least one 90-degree elbow could be

included in the supply and return air ducts, provided system

performance is not adversely impacted. The blower speed can

also be changed in the field to reduce air noise or excessive air-

flow, provided system performance is not adversely impacted.

Return Air

Drain

EXISTING DUCT SYSTEM — If the unit is connected to

existing ductwork, consider the following:

• Verify that the existing ducts have the proper capacity to

handle the unit airflow. If the ductwork is too small, install

larger ductwork.

Discharge Air

Back Discharge

Fig. 8 — Conversion Left Return,

Side Discharge to Back Discharge

• Check existing ductwork for leaks and repair as necessary.

NOTE: Local codes may require ventilation air to enter the

space for proper indoor air quality. Hard-duct ventilation

may be required for the ventilating air supply. If hard

ducted ventilation is not required, be sure that a proper air

path is provided for ventilation air to unit to meet ventila-

tion requirement of the space.

Back to Side Discharge Conversion — Follow instructions

above for Side to Back Discharge Conversion, noting the

panels would be reversed.

Step 4 — Mount the Unit

HORIZONTAL UNIT (50PTH) — Horizontal units should

be mounted using the factory-installed hangers. Proper attach-

ment of hanging rods to building structure is critical for safety.

See Fig. 1. Rod attachments must be able to support the weight

of the unit. See Table 1 for unit operating weights.

VERTICAL UNITS (50PTV,PTD) — Vertical and downflow

units are available in left or right return air configurations. See

Fig. 3 and 4. Mount the unit (except 50PTD) on a vibration

absorption pad slightly larger than the entire base to minimize

vibration transmission. It is not necessary to mount the unit on

the floor. See Fig. 9.

Step 6 — Install Condensate Drain

HORIZONTAL UNIT (50PTH) — Slope the unit toward the

drain at / in. See Fig. 10. If it is not possible to meet the re-

quired pitch, install a condensate at the unit to pump conden-

sate to building drain.

Horizontal units are not internally trapped, therefore an ex-

ternal trap is necessary. Install each unit with its own individual

trap and means to flush or blow out the condensate drain line.

Do not install units with a common trap or vent. See Fig. 11 for

typical condensate connections.

NOTE: Never use a pipe size smaller than the connection.

NOTE: Some codes require the use of a secondary drain pan

under vertical units. Check local codes for more information.

VERTICAL UNITS (50PTV,PTD) — Each unit uses a con-

densate hose inside all cabinets as a trapping loop, therefore an

external trap is not necessary. See Fig. 12.

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Each unit must be installed with its own individual vent and

means to flush or blow out the condensate drain line. Do not in-

stall units with a common trap or vent.

• Be sure to support the line where anticipated sagging from

the condensate or when “double trapping” may occur.

• If condensate pump is present on unit, be sure drain connec-

tions have a check valve to prevent back flow of condensate

into other units.

Step 7 — Pipe Connections — Depending on the

application, there are 3 types of WSHP piping systems to

choose from: water loop, ground-water and ground loop. Refer

to Piping Section of Carrier System Design Manual for addi-

tional information.

1/4” Pitch for

Drainage

All WSHP units use low temperature soldered female pipe

thread fittings for water connections to prevent annealing and

out-of-round leak problems which are typically associated with

high temperature brazed connections. Refer to Table 1 for con-

nection sizes. When making piping connections, consider the

following:

• Use a backup wrench when making screw connections to

unit to prevent internal damage to piping.

Pitch Toward

Drain

• Insulation may be required on piping to avoid condensation

in the case where fluid in loop piping operates at tempera-

tures below dew point of adjacent air.

Drain Connection

Fig. 10 — Horizontal Unit Pitch

• Piping systems that contain steel pipes or fittings may be

subject to galvanic corrosion. Dielectric fittings may be

used to isolate the steel parts of the system to avoid galvanic

corrosion.

WATER LOOP APPLICATIONS — Water loop applications

usually include a number of units plumbed to a common pip-

ing system. Maintenance to any of these units can introduce air

into the piping system. Therefore, air elimination equipment

comprises a major portion of the mechanical room plumbing.

The flow rate is usually set between 2.25 and 3.5 gpm per

ton of cooling capacity. For proper maintenance and servicing,

pressure-temperature (P/T) ports are necessary for temperature

and flow verification.

Cooling tower/boiler systems typically utilize a common

loop maintained at 60 to 95 F. The use of a closed circuit evap-

orative cooling tower with a secondary heat exchange between

the tower and the water loop is recommended. If an open type

cooling tower is used continuously, chemical treatment and fil-

tering will be necessary.

NOTE: Trap should be deep enough to offset maximum unit static

difference. A 4-in. trap is recommended.

In addition to complying with any applicable codes, consid-

er the following for system piping:

Fig. 11 — Trap Condensate Drain

• Piping systems using water temperatures below 50 F

3/4” Copper FPT/PVC

3/4” PVC

require / -in. closed cell insulation on all piping surfaces to

Vent

eliminate condensation.

1/2”

• Avoid all plastic to metal threaded fittings due to the poten-

1/4” per foot

slope to drain

tial to leak. Use a flange fitted substitute.

• Teflon tape thread sealant is recommended to minimize

internal fouling of the heat exchanger.

• Use backup wrench. Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Flush the piping system prior to operation to remove dirt

and foreign materials from the system.

1/2”

Water

Connections

Alternate

Condensate

Location

GROUND-WATER APPLICATIONS — Typical ground-

water piping is shown in Fig. 13. In addition to complying

with any applicable codes, consider the following for sys-

tem piping:

NOTE: Unit does not need to be sloped toward drain.

• Install shut-off valves for servicing.

Fig. 12 — Vertical Condensate Connection

• Install pressure-temperature plugs to measure flow and

temperature.

VENTING — Install a vent in the condensate line of any

application that may allow dirt or air to collect in the line. Con-

sider the following:

• Connect boiler drains and other valves using a “T” connec-

tor to allow acid flushing for the heat exchanger.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Use PVC SCH80 or copper piping material.

• Always install a vent where an application requires a long

horizontal run.

• Always install a vent where large units are working against

higher external static pressure and to allow proper drainage

for multiple units connected to the same condensate main.

NOTE: PVC SCH40 should not be used due to system high

pressure and temperature extremes.

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Water

Flow

Control

Regulator

(field-installed

accessory)

Valve

Pressure

Tank

(field-installed

accessory)

Water Out

Water In

From Pump

Shut-Off

Valve (field-installed accessory)

Strainer (field-installed accessory)

(16 to 20 mesh recommended for

filter sediment)

Boiler

Drains

(field-installed)

Fig. 13 — Typical Ground-Water Piping Installation

Water Supply and Quantity — Check water supply. Water

supply should be plentiful and of good quality. See Table 2 for

water quality guidelines.

5. Refer to Table 3. Do not exceed the minimum bend radius

for the hose selected. Exceeding the minimum bend radi-

us may cause the hose to collapse, which reduces water

flow rate. Install an angle adapter to avoid sharp bends

in the hose when the radius falls below the required

minimum.

IMPORTANT: Failure to comply with the above required

water quality and quantity limitations and the closed-

system application design requirements may cause damage

to the tube-in-tube heat exchanger. This damage is not the

responsibility of the manufacturer.

NOTE: Piping must comply with all applicable codes.

Insulation is not required on loop water piping except where

the piping runs through unheated areas or outside the building

or when the loop water temperature is below the minimum ex-

pected dew point of the pipe ambient. Insulation is required if

loop water temperature drops below the dew point.

In all applications, the quality of the water circulated

through the heat exchanger must fall within the ranges listed in

the Water Quality Guidelines table. Consult a local water treat-

ment firm, independent testing facility, or local water authority

for specific recommendations to maintain water quality within

the published limits.

GROUND-LOOP APPLICATIONS — Temperatures between

25 and 110 F and a cooling capacity of 2.25 to 3 gpm of flow

per ton is recommended. In addition to complying with any

applicable codes, consider the following for system piping:

CAUTION

Do not bend or kink supply lines or hoses.

Pipe joint compound is not necessary when Teflon threaded

tape is pre-applied to hose assemblies or when flared-end

connections are used. If pipe joint compound is preferred, use

compound only in small amounts on the male pipe threads of

the fitting adapters. Prevent sealant from reaching the flared

surfaces of the joint.

NOTE: When anti-freeze is used in the loop, assure that it is

compatible with Teflon tape or pipe joint compound employed.

Maximum allowable torque for brass fittings is 30 ft-lb. If a

torque wrench is not available, tighten finger-tight plus one

quarter turn. Tighten steel fittings as necessary.

Optional pressure-rated hose assemblies designed specifi-

cally for use with Carrier units are available. Similar hoses can

be obtained from alternate suppliers. Supply and return hoses

are fitted with swivel-joint fittings at one end to prevent kink-

ing during installation.

• Limit piping materials to only polyethylene fusion in the

buried sections of the loop.

• Do not use galvanized or steel fittings at any time due to

corrosion.

• Avoid all plastic to metal threaded fittings due to the poten-

tial to leak. Use a flange fitted substitute.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Use pressure-temperature (P/T) plugs to measure flow of

pressure drop.

INSTALLATION OF SUPPLY AND RETURN HOSE

KIT — Follow these piping guidelines.

1. Install a drain valve at the base of each supply and return

riser to facilitate system flushing.

CAUTION

2. Install shutoff/balancing valves and unions at each unit to

permit unit removal for servicing.

3. Place strainers at the inlet of each system circulating

pump.

Backup wrench is required when tightening water connec-

tions to prevent water line damage.

4. Select the proper hose length to allow slack between con-

nection points. Hoses may vary in length by +2% to –4%

under pressure.

Refer to Fig. 14 for an illustration of a supply/return hose

kit. Male adapters secure hose assemblies to the unit and risers.

Install hose assemblies properly and check them regularly to

avoid system failure and reduced service life.

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Table 2 — Water Quality Guidelines

MATERIAL*

CONDITION

CLOSED RECIRCULATING†

OPEN LOOP AND RECIRCULATING WELL**

Scaling Potential — Primary Measurement

Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.

pH/Calcium

Hardness Method

All

N/A

pH < 7.5 and Ca Hardness, <100 ppm

Index Limits for Probable Scaling Situations (Operation outside these limits is not recommended.)

Scaling indexes should be calculated at 150 F for direct use and HWG applications, and at 90 F for indirect HX use. A monitoring plan should be

implemented.

Ryznar Stability Index

6.0 - 7.5

If >7.5 minimize steel pipe use.

–0.5 to +0.5

All

N/A

Langelier Saturation Index

All

N/A

If <–0.5 minimize steel pipe use.

Based upon 150 F HWG and direct well, 85 F indirect well HX.

Iron Fouling

Iron Fe (Ferrous)

<0.2 ppm (Ferrous)

All

N/A

(Bacterial Iron Potential)

If Fe (ferrous) >0.2 ppm with pH 6 - 8, O <5 ppm check for iron bacteria.

Iron Fouling

<0.5 ppm of Oxygen

Above this level deposition will occur.

Corrosion Prevention††

6 - 8.5

Minimize steel pipe below 7 and no open tanks with pH <8.

<0.5 ppm

6 - 8.5

All

Monitor/treat as needed.

Hydrogen Sulfide (H S)

At H S>0.2 ppm, avoid use of copper and cupronickel piping or HXs.

N/A

Rotten egg smell appears at 0.5 ppm level.

Copper alloy (bronze or brass) cast components are okay to <0.5 ppm.

Ammonia Ion as Hydroxide,

Chloride, Nitrate and Sulfate

Compounds

<0.5 ppm

All

Maximum Chloride Levels

Maximum allowable at maximum water temperature.

50 F (10 C)

75 F (24 C)

100 F (38 C)

Copper

Cupronickel

304 SS

N/A

<20 ppm

<150 ppm

<400 ppm

<1000 ppm

>1000 ppm

<250 ppm

<550 ppm

>550 ppm

<150 ppm

<375 ppm

>375 ppm

316 SS

Titanium

Erosion and Clogging

Particulate Size and Erosion

<10 ppm of particles and a

maximum velocity of 6 fps.

Filtered for maximum

800 micron size.

<10 ppm (<1 ppm “sandfree” for reinjection) of particles and a maximum velocity

of 6 fps. Filtered for maximum 800 micron size. Any particulate that is not

removed can potentially clog components.

All

Brackish

Use cupronickel heat exchanger when concentrations of calcium or sodium chlo-

ride are greater than 125 ppm are present. (Seawater is approximately 25,000

ppm.)

N/A

LEGEND

††If the concentration of these corrosives exceeds the maximum allowable

level, then the potential for serious corrosion problems exists.

Sulfides in the water quickly oxidize when exposed to air, requiring that no

agitation occur as the sample is taken. Unless tested immediately at the

site, the sample will require stabilization with a few drops of one Molar zinc

acetate solution, allowing accurate sulfide determination up to 24 hours

after sampling. A low pH and high alkalinity cause system problems, even

when both values are within ranges shown. The term pH refers to the acid-

ity, basicity, or neutrality of the water supply. Below 7.0, the water is consid-

ered to be acidic. Above 7.0, water is considered to be basic. Neutral water

contains a pH of 7.0.

HWG — Hot Water Generator

—

Heat Exchanger

N/A

Design Limits Not Applicable Considering Recirculating

Potable Water

—

Application Not Recommended

Stainless Steel

*Heat exchanger materials considered are copper, cupronickel, 304 SS

(stainless steel), 316 SS, titanium.

†Closed recirculating system is identified by a closed pressurized piping

system.

To convert ppm to grains per gallon, divide by 17. Hardness in mg/l is

equivalent to ppm.

**Recirculating open wells should observe the open recirculating design

considerations.

Step 8 — Wire Field Power Supply

WARNING

Table 3 — Metal Hose Minimum Bend Radii

HOSE DIAMETER (in.)

MINIMUM BEND RADII (in.)

2 /

To avoid possible injury or death due to electrical shock,

open the power supply disconnect switch and secure it in

an open position during installation.

5 /

Swivel

Brass

Fitting

Brass

Fitting

Rib Crimped

CAUTION

Use only copper conductors for field-installed electrical

wiring. Unit terminals are not designed to accept other

types of conductors.

Length

(2 ft Length Standard)

MPT

Fig. 14 — Supply/Return Hose Kit

All field-installed wiring, including the electrical ground,

MUST comply with the National Electrical Code (NEC) as

well as applicable local codes. In addition, all field wiring must

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conform to the Class II temperature limitations described in the

NEC.

452 + 464 + 455

Average Voltage =

Refer to unit wiring diagrams Fig. 15-24 for a schematic of

the field connections, which must be made by the installing (or

electrical) contractor. For Deluxe D with WSHP Open controls

3-phase units and Complete C with Open controls single-phase

and 3-phase units contact Application Engineering. Refer to

Table 4 for fuse sizes.

1371

= 457

Determine maximum deviation from average voltage:

(AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v

Consult the unit wiring diagram located on the inside of the

compressor access panel to ensure proper electrical hookup.

The installing (or electrical) contractor must make the field

connections when using field-supplied disconnect.

Maximum deviation is 7 v.

Operating voltage must be the same voltage and phase as

shown in electrical data shown in Table 4.

Make all final electrical connections with a length of flexi-

ble conduit to minimize vibration and sound transmission to

the building.

Determine percent voltage imbalance.

% Voltage Imbalance = 100 x

457

= 1.53%

POWER CONNECTION — Make line voltage connection

by connecting the incoming line voltage wires to the line

side of the compressor contactor terminal as shown in

Fig. 25. See Table 4 for amperage ratings to provide correct

wire and maximum overcurrent protection sizing.

SUPPLY VOLTAGE — Operating voltage to unit must be

within voltage range indicated on unit nameplate.

On 3-phase units, voltages under load between phases must

be balanced within 2%. Use the following formula to deter-

mine the percentage voltage imbalance:

This amount of phase imbalance is satisfactory as it is

below the maximum allowable 2%.

Operation on improper line voltage or excessive phase

imbalance constitutes abuse and may cause damage to electri-

cal components.

NOTE: If more than 2% voltage imbalance is present, contact

your local electric utility.

208-VOLT OPERATION — All 208-230 volt units are factory

wired for 208 volts. The transformers may be switched to

230-volt operation by switching the red (208 volt) wire with

the orange (230 volt) wire at the L1 terminal.

% Voltage Imbalance

max voltage deviation from average voltage

460-VOLT OPERATION — Units using 460-v and an ECM

(electronically commutated motor) fan motor, modulating

HWR, and/or internal secondary pump will require a neutral

wire from the supply side in order to feed accessory with

265-v.

= 100 x

average voltage

Example: Supply voltage is 460-3-60.

AB = 452 volts

BC = 464 volts

AC = 455 volts

Table 4 — 50PTH,PTV,PTD Electrical Data

COMPRESSOR

UNITS WITH HWR

50PTH,

PTV, PTD

UNITS

FAN

MOTOR

FLA

MIN

MAX

FUSE/

HACR

VOLTAGE

MIN/MAX

TOTAL

REHEAT TOTAL

MIN

MAX

V-PH-Hz*

CIRCUIT

AMPS

UNIT FLA

RLA

LRA

PUMP

UNIT

CIRCUIT FUSE/

FLA

AMP

18.0

26.0

19.1

10.4

34.6

24.9

16.0

40.1

30.1

19.2

42.1

HACR

026

038

208/230-1-60

208/230-3-60

460-3-60

208/230-1-60

208/230-3-60

460-3-60

208/230-1-60

208/230-3-60

460-3-60

197/254

414/506

197/254

414/506

197/254

414/506

197/254

10.3

16.7

11.2

4.5

52.0

82.0

58.0

4.3

4.1

7.0

6.9

7.0

6.9

7.0

14.6

21.0

15.5

8.6

28.2

20.5

13.3

32.6

24.6

15.9

34.2

17.2

25.2

18.3

9.7

33.5

23.9

14.9

39.0

29.0

18.2

41.0

0.8

15.4

21.8

16.3

9.3

29.0

0.7

21.2

13.5

6.4

96.0

88.0

41.0

1.07

29.3

21.6

14.4

33.7

25.7

17.7

35.3

049

25.6

17.6

9.0

118.0

123.0

62.0

064

072

208/230-1-60

27.2

150.0

LEGEND

FLA — Full Load Amps

*The 460-v units using an ECM (electronically commutated motor) fan

motor, modulating HWR, and/or an internal secondary pump will require

a neutral wire from the supply side in order to feed the accessory with

265-v.

HACR — Heating, Air Conditioning and Refrigeration

LRA — Locked Rotor Amps

RLA — Rated Load Amps

HWR — Hot Water Reheat

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a50-8363

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a50-8364

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a50-8570

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a50-8571

D B

5 3

L E

G n d

n e R t +

E E G R

E I T W H

B L A C K

R E

t - R n e

+ 1 2

To WSHP Controller

Rnet Terminals (J13)

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CAPACITOR

COMPLETE C CONTROL

COMPRESSOR CONTACTOR

LINE

L O A D

ECM CONTROL

BOARD

TRANSFORMER

Fig. 25 — 50PTH,PTV,PTD Typical Single-Phase Line Voltage Power Connection

WSHP OPEN WIRING — The WSHP Open controller will Table 6 — SPT Sensors

be factory mounted to the unit control panel and wired to the

Complete C or Deluxe D control board, however, the system

wiring will need to be completed utilizing WSHP Open con-

troller wiring diagrams and the Third Party Integration (TPI)

Guide. Factory installation includes harness, LWT (leaving

water temperature), supply air, and condensate sensor.

PART

SENSOR

FEATURES

NUMBER

SPT

Standard

• Local access port

• No operator control

SPS

• Slide potentiometer to adjust set point

• Manual on button to override schedule

• LED to show occupied status

• Local access port

SPT Plus

SPT Pro

SPPL

SPP

• LCD display

WARNING

• Manual on button to override schedule

• Warmer and cooler buttons to adjust set point

• Info button to cycle through zone and outside

air temperatures, set points, and local override

time

Disconnect all power to the unit before performing mainte-

nance or service. Unit may automatically start if power is

not disconnected. Failure to follow this warning could

cause personal injury, death, and/or equipment damage.

• Local access port

• LCD display

• Manual on button to override schedule

• Warmer and cooler buttons to adjust set point

• Info button to cycle through zone and outside

air temperatures, set points, and local override

time

Wiring Sensors to Inputs — Sensors can be wired to the

WSHP Open controller’s inputs. See Table 5.

All field control wiring that connects to the WSHP Open con-

troller must be routed through the raceway built into the corner

post. The raceway provides the UL required clearance between

high and low-voltage wiring.

SPT Pro

Plus

SPPF

• Local access port

• Fan speed*

*The SPT Pro Plus fan speed adjustment has no effect in this application.

Wire SPT sensors to the WSHP Open controller’s Rnet

port. An Rnetbus can consist of any of the following combina-

tions of devices wired in a daisy-chain configuration:

1. Pass control wires through the hole provided in the corner

post.

• 1 SPT Plus, SPT Pro, or SPT Pro Plus sensor

• 1 to 4 SPT Standard sensors

2. Feed the wires through the raceway to the WSHP Open

controller.

3. Connect the wires to the removable Phoenix connectors.

4. Reconnect the connectors to the board.

Field-Supplied Sensor Hardware — The WSHP Open con-

troller is configurable with the following field-supplied sen-

sors. See Table 5.

• 1 to 4 SPT Standard sensors and 1 SPT Plus, SPT Pro, or

SPT Pro Plus sensor

• Any of the above combinations, plus up to 2 BACview

Handheld but no more than 6 total devices

NOTE: If the Rnetbus has multiple SPT Standard sensors, each

sensor must be given a unique address on the Rnetbus. See the

Carrier Open Sensor Installation Guide.

Use the specified type of wire and cable for maximum signal

integrity. See Table 7.

Table 5 — Field-Supplied Sensors for

WSHP Open Controller

SENSOR

NOTES

Space Temperature Sensor

(SPT)

Field Installed (Must be used with

WSHP Open controller.)

Table 7 — Rnet Wiring Specifications

RNET WIRING SPECIFICATIONS

Outdoor Air

Network Sensor

Temperature Sensor

4 conductor, unshielded, CMP,

Description

plenum rated cable

Indoor Air Quality Sensor

(Separate Sensor)

Required only for demand

control ventilation.

Conductor

Maximum Length

18 AWG

500 ft

Space Relative

Humidity Sensor

Separate Sensor

Jacket: white

Wiring: black, white, green, red

Recommended Coloring

NOTE: BACview Handheld or Virtual BACview can be used as the user

interface.

UL Temperature

Voltage

32 to 167 F

For specific details about sensors, refer to the literature sup-

plied with the sensor.

300-vac, power limited

UL: NEC CL2P, or better

Listing

Wiring a SPT Sensor — A WSHP Open controller is connect-

ed to a wall-mounted space temperature (SPT) sensor to moni-

tor room temperature using a Molex plug.

The WSHP Open system offers the following SPT sensors.

See Table 6.

LEGEND

AWG — American Wire Gage

CMP — Communications Plenum Cable

NEC — National Electrical Code

— Underwriters Laboratories

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To wire the SPT sensor to the controller:

Wiring a Relative Humidity (RH) Sensor — The RH sensor

is used for zone humidity control (dehumidification) if the

WSHP unit has a dehumidification device. If not, the sensor

only monitors humidity.

1. Partially cut , then bend and pull off the outer jacket of

the Rnet cable(s), being careful not to nick the inner

insulation.

NOTE: Do not use a relative humidity sensor and CO sensor

2. Strip about / in. of the inner insulation from each wire.

on the same zone controller if both sensors are powered off the

board. If sensors are externally powered, both sensors may be

used on the same zone controller.

See Fig. 26.

OUTER JACKET

If the cable used to wire the RH sensor to the controller will

be less than 100 ft, an unshielded 22 AWG (American Wire

Gage) cable should be used. If the cable will be greater than

100 ft, a shield 22 AWG cable should be used. The cable

should have a maximum length of 500 ft.

To wire the RH sensor to the controller:

1. Strip the outer jacket from the cable for at least 4 inches.

a50-8443

.25 IN.

INNER INSULATION

Fig. 26 — Rnet Cable Wire

3. Wire each terminal on the sensor to the same terminal on

the controller. See Fig. 15-24. Table 8 shows the recom-

mended Rnet wiring scheme.

2. Strip / in. of insulation from each wire.

3. Wire the sensor to the controller.

Table 8 — Rnet Wiring

Step 9 — Wire Field Controls

THERMOSTAT CONNECTIONS — The thermostat

should be wired directly to the ECM control board. See

Fig. 27.

WIRE

Red

Black

White

Green

TERMINAL

+12-v

.Rnet–

Rnet+

Gnd

WATER FREEZE PROTECTION — The Aquazone™ con-

trol allows the field selection of source fluid freeze protection

points through jumpers. The factory setting of jumper JW3

(FP1) is set for water at 30 F. In earth loop applications, jumper

JW3 should be clipped to change the setting to 10 F when

using antifreeze in colder earth loop applications. See Fig. 28.

NOTE: The extended range option should be selected

with water temperatures below 60 F to prevent internal

condensation.

NOTE: The wire should be connected to the terminal shown.

Wiring a Supply Air Temperature (SAT) Sensor

SAT sensor is required for reheat applications.

If the cable used to wire the SAT sensor to the controller

will be less than 100 ft, an unshielded 22 AWG (American

Wire Gage) cable should be used. If the cable will be greater

than 100 ft, a shield 22 AWG cable should be used. The cable

should have a maximum length of 500 ft.

To wire the SAT sensor to the controller:

1. Wire the sensor to the controller. See Fig. 15-24.

2. Verify that the Enable SAT jumper is on.

—

The

AIR COIL FREEZE PROTECTION — The air coil freeze

protection jumper JW2 (FP2) is factory set for 30 F and should

not need adjusting.

3. Verify that the Enable SAT and Remote jumper is in the

left position.

ACCESSORY CONNECTIONS — Terminal A on the control

is provided to control accessory devices such as water valves,

electronic air cleaners, humidifiers, etc. This signal operates

with the compressor terminal. See Fig. 29. Refer to the specific

unit wiring schematic for details.

NOTE: The A terminal should only be used with 24-volt

signals — not line voltage signals.

WATER SOLENOID VALVES — An external solenoid

valve(s) should be used on ground water installations to shut

off flow to the unit when the compressor is not operating. A

slow closing valve may be required to help reduce water

hammer. Figure 29 shows typical wiring for a 24-vac external

solenoid valve. Figures 30 and 31 illustrate typical slow closing

water control valve wiring for Taco 500 Series and Taco ESP

Series valves. Slow closing valves take approximately 60 sec.

to open (very little water will flow before 45 sec.). Once fully

open, an end switch allows the compressor to be energized (on-

ly on valves with end switches). Only relay or triac based elec-

tronic thermostats should be used with slow closing valves.

When wired as shown, the slow closing valve will operate

properly with the following notations:

Wiring an Indoor Air Quality (IAQ) Sensor

—

An IAQ

sensor monitors CO levels. The WSHP Open controller uses

this information to adjust the outside-air dampers to provide

proper ventilation. An IAQ sensor can be wall-mounted or

mounted in a return air duct. (Duct installation requires an aspi-

rator box assembly.)

The sensor has a range of 0 to 2000 ppm and a linear 4 to

20 mA output. This is converted to 1 to 5 vdc by a 250-ohm,

/ watt, 2% tolerance resistor connected across the zone con-

troller’s IAQ input terminals.

NOTE: Do not use a relative humidity sensor and CO sensor

on the same zone controller if both sensors are powered off the

board. If sensors are externally powered, both sensors may be

used on the same zone controller.

If the cable used to wire the IAQ sensor to the controller

will be less than 100 ft, an unshielded 22 AWG (American

Wire Gage) cable should be used. If the cable will be greater

than 100 ft, a shield 22 AWG cable should be used. The cable

should have a maximum length of 500 ft.

To wire the IAQ sensor to the controller:

1. Wire the sensor to the controller. See Fig. 15-24.

1. The valve will remain open during a unit lockout.

2. The valve will draw approximately 25 to 35 VA through

the “Y” signal of the thermostat.

2. Install a field-supplied 250-ohm, / watt, 2% tolerance

IMPORTANT: Connecting a water solenoid valve can

overheat the anticipators of electromechanical thermo-

stats. Only use relay based electronic thermostats.

resistor across the controller’s RH/IAQ and Gnd

terminals.

3. Verify the the RH/IAQ jumper is set to 0 to 5 vdc.

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CAPACITOR

COMPLETE C CONTROL

COMPRESSOR CONTACTOR

a50-8141

LINE

A D

L O

CFM

SW1

TRANSFORMER

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

OFF

DEHUM

TB1

Y2 Y1

DH AL1

AL1

THERMOSTAT CONNECTION

Fig. 27 — Low Voltage Field Wiring

a50-7764tf

a50-8441

AMV

TACO VALVE

HEATER SWITCH

AQUAZONE CONTROL (Complete C Shown)

THERMOSTAT

Fig. 28 — Typical Aquazone™ Control Board

Jumper Locations

Fig. 30 — AMV Valve Wiring

TERMINAL STRIP P2

TYPICAL

WATER

VALVE

24 VAC

a50-8442

Fig. 31 — Taco SBV Valve Wiring

Fig. 29 — Typical Accessory Wiring

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Dehumidification Mode — The dehumidification mode

setting provides field selection of humidity control. When op-

erating in the normal mode, the cooling airflow settings are de-

termined by the cooling tap setting in Table 12.

Step 10 — Operate ECM Interface Board

STANDALONE — NO DDC CONTROLS — The ECM

fan is controlled by an interface board that converts thermostat

inputs and field selectable cfm settings to signals used by the

ECM (electronically commutated motor) controller. See

Fig. 32.

Table 12 — Dehumidificaton Mode Settings

DIP SWITCH

TAP SETTING

NOTE: Power must be off to the unit for at least three seconds

before the ECM will recognize a speed change. The motor will

recognize a change in the CFM Adjust or Dehumidification

mode settings while the unit is powered.

SW9

NORM

Dehumid

OFF

When dehumidification is enabled, there is a reduction in

airflow in cooling to increase the moisture removal of the heat

pump. The Dehumidification mode can be enabled in two

ways:

There are four different airflow settings from lowest airflow

rate (speed tap 1) to the highest airflow rate (speed tap 4).

Tables 9-13 indicate settings for the ECM interface board, fol-

lowed by detailed information for each setting.

1. Constant Dehumidification mode: When the Dehumidifi-

cation mode is selected via DIP switch, the ECM will

operate with a multiplier applied to the cooling CFM

settings (approximately 20 to 25% lower airflow). Any

time the unit is running in the Cooling mode, it will oper-

ate at the lower airflow to improve latent capacity. The

“DEHUM” LED will be illuminated at all times. Heating

airflow is not affected.

CAUTION

When the disconnect switch is closed, high voltage is pres-

ent in some areas of the electrical panel. Exercise caution

when working with energized equipment.

Cooling — The cooling setting determines the cooling (nor-

mal) cfm for all units with ECM motor. Cooling (normal) set-

ting is used when the unit is not in Dehumidification mode. Tap

1 is the lowest cfm setting, while tap 4 is the highest cfm set-

ting. To avoid air coil freeze-up, tap 1 may not be used if the

Dehumidification mode is selected. See Table 9.

NOTE: Do not select Dehumidification mode if cooling

setting is tap 1.

2. Automatic (humidistat-controlled) Dehumidification

mode: When the Dehumidification mode is selected

via DIP switch AND a humidistat is connected to termi-

nal DH, the cooling airflow will only be reduced when

the humidistat senses that additional dehumidification is

required. The DH terminal is reverse logic. Therefore,

a humidistat (not dehumidistat) is required. The

“DEHUM” LED will be illuminated only when the hu-

midistat is calling for Dehumidification mode. Heat-

Table 9 — Cooling Settings

DIP SWITCH

TAP SETTING

SW1

OFF

SW2

OFF

ing

airflow is not affected.

NOTE: Do not select Dehumidification mode if cooling

setting is tap 1.

OFF

Heating — The heating setting determines the heating cfm

for 50PTH,PTV,PTD units. Tap 1 is the lowest cfm setting,

while tap 4 is the highest cfm setting. See Table 10.

1/4" SPADE

CONNECTIONS

TO COMPLETE C OR

DELUXE D BOARD

THERMOSTAT

INPUT LEDS

Table 10 — Heating Settings

DIP SWITCH

TAP SETTING

SW3

OFF

SW4

OFF

CFM COUNTER

THERMOSTAT

CONNECTIONS

1 FLASH PER 100 CFM

OFF

ECM MOTOR

LOW VOLTAGE

CONNECTOR

CFM Adjust — The CFM Adjust setting allows four selec-

tions. The NORM setting is the factory default position. The +

or – settings adjust the airflow by ±15%. The + or – settings are

used to “fine tune” airflow adjustments. The TEST setting runs

the ECM at 70% torque, which causes the motor to operate

like a standard PSC motor, and disables the cfm counter. See

Table 11.

DEHUMIDIFICATION

LED

Table 11 — CFM Adjust Settings

FAN SPEED SELECTION DIP SWITCH

DIP SWITCH

TAP SETTING

Fig. 32 — ECM Interface Board Physical Layout

SW7

OFF

SW8

OFF

TEST

–

NORM

OFF

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Table 13 — Blower Performance Data

FAN

MOTOR

(hp)

COOLING MODE (cfm)

Stage 1 Stage 2 Fan

DEHUMIDIFICATION MODE (cfm)

HEATING MODE (cfm)

50PT

MAX ESP

TAP

SETTING

UNIT SIZE (in. wg)

Stage 1

Stage 2

Fan

Stage 1

Stage 2

Fan

810

725

620

950

850

730

475

425

370

300

700

630

540

450

870

780

670

560

1020

920

790

660

1050

980

910

850

630

560

490

—

870

780

670

—

1140

1020

870

—

1300

1160

1000

—

740

660

570

—

1090

980

840

—

1350

1210

1040

—

1600

1430

1230

—

475

425

370

—

700

630

540

—

870

780

670

—

1020

920

790

—

920

825

710

1060

950

820

475

425

370

300

700

630

540

450

870

780

670

560

1020

920

790

660

1050

980

910

850

026

038

049

064

072

0.50

0.75

520

610

600

690

1120

1000

860

1400

1250

1080

900

1120

1000

860

1400

1250

1080

900

730

1460

1300

1120

940

1670

1500

1280

1080

1620

1500

1400

1320

1730

1550

1330

1120

2050

1825

1580

1320

2190

1950

1830

1700

1560

1400

1200

1010

1860

1650

1430

1200

1690

1600

1400

1240

1850

1650

1430

1200

2280

2050

1750

1470

2230

2100

1850

1620

1270

1170

1100

—

1650

1520

1420

—

1050

980

910

—

WSHP OPEN CONTROLS — The ECM fan is controlled by

an interface board that converts the fan speed outputs from the

WSHP Open control board to the signal used by the ECM mo-

tor (see Fig 35). The indicator LEDs allow the service techni-

cian to view the airflow mode that the WSHP Open control is

commanding. The table below indicates the illuminated LEDs

for each fan mode.

Table 14A). The fan speed and airflow is independent from the

compressor capacity control. During Fan Only operation, the

fan will operate at the Fan Only airflow value specified in the

table for the appropriate tap setting. Once either cooling or

heating is required and the compressor is energized, the fan

will increase the minimum airflow across the coil to the value

defined by the low fan selection. Coil freeze protection and ex-

cessive discharge air temperature protection are integral parts

of the WSHP Open controller function so the fan airflow can

increase to medium or high airflow as required and indepen-

dent of compressor capacity to prevent excessively hot or cold

supply air temperature and coil freeze-up. The selection of the

high fan airflow setting is independent of the other fan airflow

settings and is defined in Table 14B. The high airflow must be

chosen so that it is equal to or greater than the medium fan air-

flow. Therefore the tap setting for high fan (SW5 and SW6)

MUST equal or exceed the tap chosen for the SW3 and SW4.

ECM INDICATORS LEDs

SPEED

Fan Only

Low Fan

Med Fan

High Fan

G + Y1

G + Y1 + Y2

G + Y1 +W

NOTE: Power must be off to the unit for at least three seconds

before the ECM will recognize a speed change. The motor will

recognize a change in the CFM Adjust setting (SW7 and SW8)

while the unit is powered.

Dehumidification — When Dehumidification is used, the fan

operates at the airflow setting defined by the Medium Fan air-

flow setting and the tap position of SW3 and SW4.

CFM Adjust — The CFM Adjust setting allows the balancer

to fine tune the actual airflow. SW7 and SW8 are used to set

the CFM Adjustment if necessary. The NORM setting is the

factory default. The (+) or (-) settings provide the ability to ad-

just the airflow by either +15% or -15% as needed. A test posi-

tion is also provided but should not be used (see Table 11).

The WSHP Open controller provides four different airflow

settings which can be set between the lowest airflow (tap 1) to

the highest airflow (tap 4). The lowest three airflow settings

(Fan Only, Low, and Medium) are set using SW3 and SW 4

while the highest airflow (High) is set independently using

SW5 and SW6. This provides the ability to better adjust the fan

performance of the unit to meet the required load conditions.

Cooling and Heating — The SW3 and SW4 DIP switch set-

tings determine the fan airflow (cfm) to be used during normal

Fan Only, Cooling, Heating, and Dehumidification modes (see

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Table 14A — WSHP Open — Fan Only / Low Fan and Med Fan Airflow

50PT UNIT MAX FAN MOTOR

SW 3

(SW 1)

SW 4

(SW 2)

COOLING AND

HEATING LOW FAN

COOLING AND

HEATING MED FAN

TAP SETTING

FAN ONLY

SIZE

ESP

OFF

475

425

370

300

700

630

540

450

870

780

670

560

1020

920

780

660

1050

980

910

850

920

825

1050

950

0.5

OFF

710

600

1120

1000

860

820

690

1400

1250

1080

900

1850

1650

1430

1200

2280

2040

1750

1470

2230

2100

1850

1620

OFF

0.5

OFF

730

OFF

1560

1400

1200

1010

1860

1650

1430

1200

1600

1400

1240

0.75

OFF

NOTE: Factory default setting shown bold.

IMPORTANT: The tap setting for high fan MUST equal or exceed the

tap setting for fan only/low/med fan

Table 14B — WSHP Open — High Fan Airflow

50PT UNIT SIZE MAX ESP

FAN MOTOR HP

TAP SETTING

SW 5

OFF

SW 6

OFF

COOLING AND HEATING HIGH FAN

1060

950

0.5

OFF

820

690

OFF

1400

1350

1850

1660

1430

1350

2280

2050

1750

1470

2230

2100

1870

1670

OFF

0.75

OFF

NOTE: Factory default setting shown bold.

IMPORTANT: The tap setting for high fan MUST equal or exceed the

tap setting for fan only/low/med fan

5. Air is purged from closed loop system.

6. System is balanced as required. Monitor if necessary.

7. Isolation valves are open.

PRE-START-UP

8. Water control valves or loop pumps are wired.

9. Condensate line is open and correctly pitched.

10. Transformer switched to lower voltage tap if necessary.

11. Blower rotates freely — shipping support is removed.

12. Blower speed is on correct setting.

13. Air filter is clean and in position.

14. Service/access panels are in place.

15. Return-air temperature is between 40 to 80 F heating and

50 to 110 F cooling.

System Checkout — When the installation is complete,

follow the system checkout procedure outlined below before

starting up the system. Be sure:

1. Voltage is within the utilization range specifications of the

unit compressor and fan motor and voltage is balanced

for 3-phase units.

2. Fuses, breakers and wire are correct size.

3. Low voltage wiring is complete.

4. Piping and system flushing is complete.

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16. Air coil is clean.

17. Control field-selected settings are correct.

AIR COIL — To obtain maximum performance, clean the air

coil before starting the unit. A 10% solution of dishwasher

detergent and water is recommended for both sides of the coil.

Rinse thoroughly with water.

NOTE: The alarm relay will not cycle during Test mode if

switch is set to OFF, stage 2.

SWITCH 3 — Not used.

DDC OUTPUT AT EH2 — Switch 4 provides a selection for

Direct Digital Control (DDC) operation. If set to DDC output

at EH2, the EH2 terminal will continuously output the last

fault code of the controller. If the control is set to EH2 Normal,

then EH2 will operate as standard electric heat output. Set the

switch to ON to set the EH2 to normal. Set the switch to OFF

to set the DDC output at EH2.

FACTORY SETTING — Switch 5 is set to ON. Do not

change the switch to OFF unless instructed to do so by the

factory.

FIELD SELECTABLE INPUTS

Jumpers and DIP (dual in-line package) switches on the

control board are used to customize unit operation and can be

configured in the field.

IMPORTANT: Jumpers and DIP switches should only

be clipped when power to control board has been turned

off.

Deluxe D Control DIP Switches — The Deluxe D

control has 2 DIP (dual in-line package) switch banks. Each

bank has 8 switches and is labeled either S1 or S2 on the cir-

cuit board. See Fig. 16, 18, 20, 22, and 23.

DIP SWITCH BANK 1 (S1) — This set of switches offers

the following options for Deluxe D control configuration:

Performance Monitor (PM) — The PM is a unique feature

that monitors water temperature and will display a warning

when heat pump is beyond typical operating range. Set switch 1

to enable or disable performance monitor. To enable the PM, set

the switch to ON. To disable the PM, set the switch to OFF.

Compressor Relay Staging Operation — Switch 2 will en-

able or disable compressor relay staging operation. The com-

pressor relay can be set to turn on with stage 1 or stage 2 call

from the thermostat. This setting is used with dual stage units

(units with 2 compressors and 2 Deluxe D controls) or in mas-

ter/slave applications. In master/slave applications, each com-

pressor and fan will stage according to its switch 2 setting. If

switch is set to stage 2, the compressor will have a 3-second

delay before energizing during stage 2 demand.

Complete C Control Jumper Settings

WATER COIL FREEZE PROTECTION (FP1) LIMIT

SETTING — Select jumper 3 (JW3-FP1 Low Temp) to

choose FP1 limit of either 30 F or 10 F. To select 30 F as the

limit, DO NOT clip the jumper. To select 10 F as the limit, clip

the jumper.

AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-

TING — Select jumper 2 (JW2-FP2 Low Temp) to choose

FP2 limit of either 30 F or 10 F. To select 30 F as the limit, DO

NOT clip the jumper. To select 10 F as the limit, clip the

jumper.

ALARM RELAY SETTING — Select jumper 1 (JW1-AL2

Dry) to either connect alarm relay terminal (AL2) to 24 vac (R)

or to remain as a dry contact (no connection). To connect AL2

to R, DO NOT clip the jumper. To set as dry contact, clip the

jumper.

Deluxe D Control Jumper Settings

NOTE: If DIP switch is set for stage 2, the alarm relay will not

cycle during Test mode.

WATER COIL FREEZE PROTECTION (FP1) LIMIT

SETTING — Select jumper 3 (JW3-FP1 Low Temp) to

choose FP1 limit of either 30 F or 10 F. To select 30 F as the

limit, DO NOT clip the jumper. To select 10 F as the limit, clip

the jumper.

AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-

TING — Select jumper 2 (JW2-FP2 Low Temp) to choose

FP2 limit of either 30 F or 10 F. To select 30 F as the limit, DO

NOT clip the jumper. To select 10 F as the limit, clip the

jumper.

ALARM RELAY SETTING — Select jumper 4 (JW4-AL2

Dry) to either connect alarm relay terminal (AL2) to 24 vac (R)

or to remain as a dry contact (no connection). To connect AL2

to R, DO NOT clip the jumper. To set as dry contact, clip the

jumper.

Heating/Cooling Thermostat Type — Switch 3 provides se-

lection of thermostat type. Heat pump or heat/cool thermostats

can be selected. Select OFF for heat/cool thermostats. When in

heat/cool mode, Y1 is used for cooling stage 1, Y2 is used for

cooling stage 2, W1 is used for heating stage 1 and O/W2 is

used for heating stage 2. Select ON for heat pump thermostats.

In heat pump mode, Y1 used is for compressor stage 1, Y2 is

used for compressor stage 2, W1 is used for heating stage 3 or

emergency heat, and O/W2 is used for reversing valve (heating

or cooling) depending upon switch 4 setting.

O/B Thermostat Type — Switch 4 provides selection for heat

pump O/B thermostats. O is cooling output. B is heating out-

put. Select ON for thermostats with O output. Select OFF for

thermostats with B output.

LOW PRESSURE SETTING — The Deluxe D control can

be configured for Low Pressure Setting (LP). Select jumper 1

(JW1-LP Norm Open) for choosing between low pressure

input normally opened or closed. To configure for normally

closed operation, DO NOT clip the jumper. To configure for

normally open operation, clip the jumper.

Dehumidification Fan Mode — Switch 5 provides selection

of normal or dehumidification fan mode. Select OFF for

dehumidification mode. The fan speed relay will remain OFF

during cooling stage 2. Select ON for normal mode. The fan

speed relay will turn on during cooling stage 2 in normal mode.

Output — Switch 6 provides selection for DDC operation. If

set to DDC output at EH2, the EH2 terminal will continuously

output the last fault code of the controller. If the control is set to

EH2 normal, then the EH2 will operate as standard electric

heat output. Set the switch to ON to set the EH2 to normal. Set

the switch to OFF to set the DDC output at EH2.

Boilerless Operation — Switch 7 provides selection of boil-

erless operation and works in conjunction with switch 8. In

boilerless operation mode, only the compressor is used for

heating when FP1 is above the boilerless changeover tempera-

ture set by switch 8 below. Select ON for normal operation or

select OFF for boilerless operation.

Complete C Control DIP Switches — The Com-

plete C control has 1 DIP (dual in-line package) switch bank

with five switches labeled SW1. See Fig. 15, 17 , 19, and 21.

PERFORMANCE MONITOR (PM) — The PM is a unique

feature that monitors water temperature and will display a warn-

ing when heat pump is beyond typical operating range. Refer to

Control Operation section for detailed information. DIP switch

1 will enable or disable this feature. To enable the PM, set the

switch to ON. To disable the PM, set the switch to OFF.

STAGE 2 — DIP switch 2 will enable or disable compressor

delay. Set DIP switch to OFF for stage 2 in which the compres-

sor will have a 3-second delay before energizing.

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Boilerless Changeover Temperature — Switch 8 on S1

provides selection of boilerless changeover temperature set

point. Select OFF for set point of 50 F or select ON for set

point of 40 F.

If switch 8 is set for 50 F, then the compressor will be used

for heating as long as the FP1 is above 50 F. The compressor

will not be used for heating when the FP1 is below 50 F and the

compressor will operates in emergency heat mode, staging on

EH1 and EH2 to provide heat. If a thermal switch is being used

instead of the FP1 thermistor, only the compressor will be used

for heating mode when the FP1 terminals are closed. If the FP1

terminals are open, the compressor is not used and the control

goes into emergency heat mode.

DIP SWITCH BANK 2 (S2) — This set of DIP switches is

used to configure accessory relay options. See Fig. 16, 18, 20,

22, and 23.

Switches 1 to 3 — These DIP switches provide selection of

Accessory 1 relay options. See Table 15A for DIP switch

combinations.

pump. The reversing valve ("O" signal) is energized in cool-

ing, along with the compressor contactor(s) and blower relay.

In the heating mode, the reversing valve is deenergized.

Almost any thermostat will activate the heat pump in heating

or cooling modes. The Deluxe D microprocessor board, which

is standard with the HWR option, will accept either heat pump

(Y,O) thermostats or non-heat pump (Y,W) thermostats.

The reheat mode requires either a separate humidistat/

dehumidistat or a thermostat that has an integrated dehumidifi-

cation function for activation. The Deluxe D board is config-

ured to work with either a humidistat or dehumidistat input to

terminal “H” (DIP switch settings for the Deluxe D board are

shown in Table 16). Upon receiving an “H” input, the Deluxe

D board will activate the cooling mode and engage reheat.

Table 16 — Humidistat/Dehumidistat Logic and

Deluxe D DIP Switch Settings

Reheat

Sensor

2.1 2.2 2.3

Off Off Off

Logic

(ON) - H (OFF) - H

Humidistat

Reverse

0 VAC

24 VAC

0 VAC

Switches 4 to 6 — These DIP switches provide selection of

Accessory 2 relay options. See Table 15B for DIP switch

combinations.

Dehumidistat Off On Off Standard 24 VAC

Table 17 shows the relationship between thermostat input

signals and unit operation. There are four operational inputs for

single-stage units and six operational inputs for dual-stage

units:

Table 15A — DIP Switch Block S2 —

Accessory 1 Relay Options

• Fan Only

DIP SWITCH POSITION

ACCESSORY 1

RELAY OPTIONS

• Cooling Stage 1

• Cooling Stage 2

• Heating Stage 1

• Heating Stage 2

• Reheat Mode

WSHP OPEN CONTROLS — A heat pump equipped with

the hot water reheat option and the WSHP Open controller,

operates in three modes: Cooling, Heating and Dehumidifica-

tion. Cooling and Heating modes follow the standard water

source heat pump operation with the reversing valve control-

ling the operating mode (Heating or Cooling) and the compres-

sor.

Cycle with Fan

Digital NSB

Water Valve — Slow Opening

OAD

Reheat — Humidistat

Reheat — Dehumidistat

Off

LEGEND

NSB — Night Setback

OAD — Outside Air Damper

NOTE: All other DIP switch combinations are invalid.

Table 15B — DIP Switch Block S2 —

Accessory 2 Relay Options

The hot water reheat option uses the Deluxe D board and

the optional humidity sensor to provide dehumidification oper-

ation that is separate from the standard heating or cooling cy-

cle. The Dehumidification mode is active when the value of the

humidity sensor exceeds the appropriate (occupied or unoccu-

pied) humidity setpoint in the WSHP Open controller. When

this occurs, the WSHP Open controller outputs a signal to the

H terminal of the Deluxe D board which starts dehumidifica-

tion with hot water reheat. The WSHP Open controller also

sets the fan to operate at the airflow defined by the medium fan

speed and the tap setting of SW3 and SW4. Dehumidification

is ONLY active when neither cooling nor heating is required

and the humidity sensor value exceeds the humidity setpoint.

Also, both the HWR option and the Optional RH sensor must

be set to Enable in the WSHP Open control for dehumidifica-

tion.

HWR APPLICATION CONSIDERATIONS — Unlike

most hot gas reheat options, the HWR option will operate

over a wide range of entering-water temperatures (EWTs).

Special flow regulation (water regulating valve) is not

required for low EWT conditions. However, below 55 F,

supply-air temperatures cannot be maintained at 72 F

because the cooling capacity exceeds the reheat coil capac-

ity at low water temperatures. Below 55 F, essentially all

water is diverted to the reheat coil (no heat of rejection to

the building loop). Although the HWR option will work fine

with low EWTs, overcooling of the space may result with

well water systems or, on rare occasions, with ground loop

(geothermal) systems (NOTE: Extended range units are

required for well water and ground loop systems). Since

dehumidification is generally only required in cooling, most

DIP SWITCH POSITION

ACCESSORY 2

RELAY OPTIONS

Cycle with Compressor

Digital NSB

Water Valve — Slow Opening

OAD

Off

LEGEND

NSB — Night Setback

OAD — Outside Air Damper

NOTE: All other switch combinations are invalid.

Auto Dehumidification Mode or High Fan Mode — Switch 7

provides selection of auto dehumidification fan mode or high

fan mode. In auto dehumidification fan mode, the fan speed

relay will remain off during cooling stage 2 if terminal H is

active. In high fan mode, the fan enable and fan speed relays will

turn on when terminal H is active. Set the switch to ON for auto

dehumidification fan mode or to OFF for high fan mode.

Factory Setting — Switch 8 is set to ON. Do not change the

switch to OFF unless instructed to do so by the factory.

Units with Modulating Hot Water Reheat

(HWR) Option

STANDALONE — NO DDC CONTROLS — A heat

pump equipped with hot water reheat (HWR) can operate in

three modes: cooling, cooling with reheat, and heating. The

cooling and heating modes are like any other water source heat

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ground loop systems will not experience overcooling of the

supply-air temperature. If overcooling of the space is a con-

cern (e.g., computer room well water application), auxiliary

heating may be required to maintain space temperature

when the unit is operating in the dehumidification mode.

Water source heat pumps with HWR should not be used as

makeup air units. These applications should use equipment

specifically designed for makeup air.

CYCLE WITH FAN — In this configuration, the accessory

relay 1 will be ON any time the Fan Enable relay is on.

CYCLE WITH COMPRESSOR — In this configuration, the

accessory relay 2 will be ON any time the Compressor relay is

on.

DIGITAL NIGHT SET BACK (NSB) — In this configura-

tion, the relay will be ON if the NSB input is connected to

ground C.

HWR COMPONENT FUNCTIONS — The proportional

controller operates on 24 VAC power supply and automatically

adjusts the water valve based on the supply-air sensor. The

supply-air sensor senses supply-air temperature at the blower

inlet, providing the input signal necessary for the proportional

control to drive the motorized valve during the reheat mode of

operation. The motorized valve is a proportional actuator/three-

way valve combination used to divert the condenser water

from the coax to the hydronic reheat coil during the reheat

mode of operation. The proportional controller sends a signal

to the motorized valve based on the supply-air temperature

reading from the supply air sensor.

The loop pump circulates condenser water through the hy-

dronic reheat coil during the reheat mode of operation (refer to

Fig. 33). In this application, the loop pump is only energized

during the reheat mode of operation. The hydronic coil is uti-

lized during the reheat mode of operation to reheat the air to the

set point of the proportional controller. Condenser water is di-

verted by the motorized valve and pumped through the hydron-

ic coil by the loop pump in proportion to the control set point.

The amount of reheating is dependent on the set point and how

far from the set point the supply air temperature is. The factory

set point is 70 to 75 F, generally considered "neutral" air.

NOTE: If there are no relays configured for digital NSB, then

the NSB and override (OVR) inputs are automatically config-

ured for mechanical operation.

MECHANICAL NIGHT SET BACK — When NSB input is

connected to ground C, all thermostat inputs are ignored. A

thermostat set back heating call will then be connected to the

OVR input. If OVR input becomes active, then the Deluxe D

control will enter night low limit (NLL) staged heating mode.

The NLL staged heating mode will then provide heating dur-

ing the NSB period.

WATER VALVE (SLOW OPENING) — If relay is configured

for Water Valve (slow opening), the relay will start 60 seconds

prior to starting compressor relay.

OUTSIDE AIR DAMPER (OAD) — If relay is configured for

OAD, the relay will normally be ON any time the Fan Enable

relay is energized. The relay will not start for 30 minutes fol-

lowing a return to normal mode from NSB, when NSB is no

longer connected to ground C. After 30 minutes, the relay will

start if the Fan Enable is set to ON.

CAUTION

To avoid equipment damage, DO NOT leave system filled

in a building without heat during the winter unless anti-

freeze is added to system water. Condenser coils never

fully drain by themselves and will freeze unless winterized

with antifreeze.

Deluxe D Control Accessory Relay Configura-

tions — The following accessory relay settings are applica-

ble for Deluxe D control:

Table 17 — HWR Operating Modes

INPUT

Off

OUTPUT

MODE

On/Off

Off

Y2*

Off

On/Off

Off

On/Off

Off

Y2*

Off

On/Off

Off

On/Off

Reheat

Off

No Demand

Fan Only

Off

Cooling Stage 1

Cooling Stage 2

Cooling and Dehumidistat

Dehumidistat Only

Heating Stage 1

†

Heating Stage 2

Heating and Dehumidistat**

Off

*Not applicable for single stage units; Full load operation for dual capacity

**Deluxe D is programmed to ignore the H demand when the unit is in heating

units.

mode.

†Cooling input takes priority over dehumidify input.

NOTE: On/Off is either on or off.

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Water Out

(To Water Loop)

a50-8145

Refrigerant In

(Cooling)

Mixing Valve

Water In

(From Water Loop)

Internal Pump

COAX

Refrigerant Out

(Cooling)

Leaving

Air

Entering Air

Reheat

Coil

NOTE: All components shown are

internal to the heat pump unit.

Evaporator Coil

Fig. 33 — HWR Schematic

3. Balance airflow at registers.

START-UP

4. Adjust all valves to the full open position and turn on the

line power to all heat pump units.

5. Operate unit in the cooling cycle first, then the heating

cycle. Refer to Table 18 for unit operating limits. Al-

low 15 minutes between cooling and heating tests for

pressure to equalize.

NOTE: Two factors determine the operating limits of a unit:

entering-air temperature and water temperature. Whenever any

of these factors are at a minimum or maximum level, the other

two factors must be at a normal level to ensure proper unit

operation. See Table 18.

Use the procedure outlined below to initiate proper unit

start-up.

NOTE: This equipment is designed for indoor installation only.

Operating Limits

ENVIRONMENT — This equipment is designed for indoor

installation ONLY. Extreme variations in temperature, humidi-

ty and corrosive water or air will adversely affect the unit per-

formance, reliability and service life.

POWER SUPPLY — A voltage variation of ± 10% of name-

plate utilization voltage is acceptable.

UNIT STARTING CONDITIONS — Units start and operate

in an ambient temperature of 45 F with entering-air tempera-

ture at 50 F, entering-water temperature at 60 F and with both

air and water at the flow rates used.

NOTE: These operating limits are not normal or continuous

operating conditions. Assume that such a start-up is for the

purpose of bringing the building space up to occupancy tem-

perature. See Table 18 for operating limits.

Table 18 — Operating Limits —

50PTH, PTV, PTD Units

AIR LIMITS

Min. Ambient Air

Rated Ambient Air

Max. Ambient Air

Min. Entering Air

Rated Entering Air db/wb

Max. Entering Air db/wb

WATER LIMITS

COOLING (F)

HEATING (F)

100

80/67

110/83

Min. Entering Water

Normal Entering Water

Max. Entering Water

LEGEND

50-110

120

30-70

WARNING

When the disconnect switch is closed, high voltage is pres-

ent in some areas of the electrical panel. Exercise caution

when working with the energized equipment.

—

Dry Bulb

Wet Bulb

NOTE: Value in heating column is dry bulb only. Any wet bulb reading is

acceptable.

1. Restore power to system.

2. Turn thermostat fan position to ON. Blower should start.

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4. Check the temperature of both supply and discharge

water. Compare to Tables 20-23. If temperature is within

range, proceed. If temperature is outside the range, check

the cooling refrigerant pressures in Tables 20-23.

5. Check air temperature drop across the coil when com-

pressor is operating. Air temperature drop should be

between 15 and 25 F.

Scroll Compressor Rotation — It is important to be

certain compressor is rotating in the proper direction. To

determine whether or not compressor is rotating in the proper

direction:

1. Connect service gages to suction and discharge pressure

fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge

Unit Start-Up Heating Mode

pressure should rise, as is normal on any start-up.

NOTE: Operate the unit in heating cycle after checking the

cooling cycle. Allow 5 minutes between tests for the pressure

or reversing valve to equalize.

If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

1. Turn off power to the unit. Install disconnect tag.

2. Reverse any two of the unit power leads.

3. Reapply power to the unit and verify pressures are correct.

The suction and discharge pressure levels should now move

to their normal start-up levels.

When the compressor is rotating in the wrong direction, the

unit makes more noise and does not provide cooling.

After a few minutes of reverse operation, the scroll com-

pressor internal overload protection will open, thus activating

the unit lockout. This requires a manual reset. To reset, turn the

thermostat on and then off.

1. Turn thermostat to lowest setting and set thermostat

switch to HEAT position.

2. Slowly turn the thermostat to a higher temperature until

the compressor activates.

3. Check for warm air delivery at the unit grille within a few

minutes after the unit has begun to operate.

4. Check the temperature of both supply and discharge

water. Compare to Tables 20-23. If temperature is within

range, proceed. If temperature is outside the range, check

the heating refrigerant pressures in Tables 20-23.

5. Once the unit has begun to run, check for warm air deliv-

ery at the unit grille.

6. Check air temperature rise across the coil when compres-

sor is operating. Air temperature rise should be between

20 and 30 F after 15 minutes at load.

NOTE: There is a 5-minute time delay before the compressor

will start.

Unit Start-Up Cooling Mode

1. Adjust the unit thermostat to the warmest position.

Slowly reduce the thermostat position until the compres-

sor activates.

2. Check for cool air delivery at unit grille a few minutes

after the unit has begun to operate.

3. Verify that the compressor is on and that the water flow

rate is correct by measuring pressure drop through the

heat exchanger using P/T plugs. See Table 19. Check the

elevation and cleanliness of the condensate lines; any

dripping could be a sign of a blocked line. Be sure the

condensate trap includes a water seal.

7. Check for vibration, noise and water leaks.

Table 19 — Water Temperature Change

Through Heat Exchanger

COOLING

RISE (F)

HEATING

DROP (F)

WATER FLOW RATE (GPM)

Min

Max

Min

Max

For Closed Loop: Ground Source or

Cooling/Boiler Systems at 3 gpm/ton

For Open Loop: Ground Water Systems at

1.5 gpm/ton

Table 20 — Typical 50PTH,PTV,PTD026 Unit Operating Pressures and Temperatures

FULL LOAD COOLING WITHOUT HWG ACTIVE

Water

FULL LOAD HEATING WITHOUT HWG ACTIVE

Water

ENTERING

WATER

TEMP (F)

(EWT)

WATER

FLOW

(Gpm/Ton)

Air

Temp

Drop (F)

Air

Suction Discharge Super-

Sub-

cooling

(F)

Suction Discharge Super-

Sub-

cooling

(F)

Temp

Rise

(F)

Temp

Drop

(F)

Temp

Rise (F)

Pressure Pressure

heat

(F)

Pressure Pressure

heat

(F)

(psig)

1.5

2.25

1.5

2.25

118-128

128-138

159-179

146-166

132-152

186-206

172-192

158-178

25-30

18-23

9-14

7-12

8-13

6-11

16.7-18.7

12.3-14.3

7.9- 9.9

16.3-18.3

12.1-14.1

7.8- 9.8

19-25

20-26

19-25

20-26

73- 83

75- 85

78- 88

102-112

106-116

110-120

273-293

275-295

277-297

302-322

303-323

305-325

6-11

8-12

3- 8

6-11

5.9- 7.9

4.2- 6.2

2.7- 4.7

8.9-10.9

6.7- 8.7

4.5- 6.5

16-22

17-23

18-24

22-28

23-29

1.5

2.25

136-146

281-301

267-287

253-273

7-12

5-10

4- 9

15.7-17.7

11.6-13.6

7.6- 9.6

19-25

128-138

134-144

141-151

330-350

332-352

334-354

10-15

8-13

11.3-13.3

8.5-10.5

5.8- 7.8

27-34

28-35

1.5

2.25

139-149

368-388

354-374

340-360

6-11

7-12

5-10

14.9-16.9

11.0-13.0

7.2- 9.2

18-24

162-172

166-176

171-181

367-387

372-392

377-397

14-19

15-20

17-22

10-15

14.4-16.4

10.8-12.8

7.1- 9.1

33-41

34-42

1.5

2.25

143-153

465-485

450-470

433-453

6-11

7-12

5-10

13.9-15.9

10.2-12.2

6.5- 8.5

17-23

—

110

LEGEND

HWG — Hot Water Generator

— No heating operation in this temperature range

— Dry Bulb

—

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Table 21 — Typical 50PTH,PTV,PTD038 Unit Operating Pressures and Temperatures

FULL LOAD COOLING WITHOUT HWG ACTIVE

Water

FULL LOAD HEATING WITHOUT HWG ACTIVE

Water

ENTERING

WATER

TEMP (F)

(EWT)

WATER

FLOW

(Gpm/Ton)

Air

Temp

Drop (F)

Air

Temp

Rise (F)

Suction Discharge Super-

Sub-

cooling

(F)

Suction Discharge Super-

Sub-

cooling

(F)

Temp

Rise

(F)

Temp

Drop

(F)

Pressure Pressure

heat

(F)

Pressure Pressure

heat

(F)

(psig)

1.5

2.25

1.5

2.25

120-130

119-129

129-139

128-138

156-176

148-168

138-158

225-245

211-231

197-217

25-30

15-20

9-14

8-13

10-15

9-14

22.1-24.1

16.8-18.8

10.5-12.5

21.9-23.9

16.1-18.1

10.3-12.3

18-24

19-25

18-24

19-25

69- 79

73- 83

76- 86

96-106

100-110

105-115

293-313

297-317

300-320

322-342

326-346

331-351

7-12

10-15

14-19

17-22

8.9-10.9

6.7- 8.7

4.5- 6.5

12.2-14.2

9.3-11.3

6.4- 8.4

17-23

18-24

19-25

23-29

24-30

1.5

2.25

136-146

135-145

302-322

283-303

265-285

9-14

13-18

12-17

21.5-23.5

15.8-17.8

10.0-12.0

18-24

19-25

123-133

129-139

135-145

352-372

358-378

364-384

11-16

19-24

15-17

11.6-13.6

8.2-10.2

28-35

29-36

30-37

1.5

2.25

140-150

390-410

369-389

349-369

7-12

8-13

13-18

8-13

20.5-22.5

14.9-16.9

9.3-11.3

17-23

157-167

169-179

181-191

390-410

399-419

408-428

13-18

18-23

21-23

36-44

37-45

39-47

13-18 16.5-21.5 15.5-17.5

14-19

15-20

10.5-12.5

1.5

2.25

145-155

488-508

467-487

447-467

7-12

8-13

13-18

8-13

19.0-21.0

14.0-16.0

9.0-11.0

17-23

—

110

LEGEND

HWG — Hot Water Generator

— No heating operation in this temperature range

— Dry Bulb

—

Table 22 — Typical 50PTH,PTV,PTD049 Unit Operating Pressures and Temperatures

FULL LOAD COOLING WITHOUT HWG ACTIVE

Water

FULL LOAD HEATING WITHOUT HWG ACTIVE

Water

ENTERING

WATER

FLOW

(Gpm/Ton)

Air

Temp

Drop (F)

Air

Temp

Rise (F)

WATER

TEMP (F)

(EWT)

Suction Discharge Super-

Sub-

cooling

(F)

Suction Discharge Super-

Sub-

cooling

(F)

Temp

Rise

(F)

Temp

Drop

(F)

Pressure Pressure

heat

(F)

Pressure Pressure

heat

(F)

(psig)

1.5

2.25

1.5

2.25

112-122

111-121

125-135

123-133

122-132

187-207

167-187

147-167

242-262

224-244

205-225

22-27

23-28

13-18

14-19

12-17

11-16

10-15

9-14

7-12

20.7-22.7

15.5-17.5

10.2-12.2

20.9-22.9

15.6-17.6

10.2-12.2

18-24

19-25

66- 76

69- 79

72- 82

93-103

98-108

103-113

286-306

289-309

292-312

314-334

320-340

326-346

7-12

8-13

9-14

10-15

8-10

6- 8

4- 6

11.5-13.5

8.7-10.7

5.9- 7.9

18-24

19-25

23-29

24-30

25-31

1.5

2.25

133-143

132-142

131-141

310-330

290-310

270-290

8-13

9-14

8-13

7-12

5-10

20.5-22.5

15.2-17.2

9.9-11.9

19-25

123-133

130-140

137-147

344-364

354-374

361-381

9-14

15-17

11.5-13.5

7.9- 9.9

28-35

29-36

30-37

1.5

2.25

138-148

137-147

136-146

396-416

374-394

352-372

7-12

6-11

4- 9

19.2-21.2

14.3-16.3

9.3-11.3

18-24

165-175

175-185

185-195

390-410

401-421

413-433

13-18

15-20

17-22

8-13

19.6-21.6

15-17

10.3-12.3

37-45

38-46

39-47

1.5

2.25

144-154

143-153

142-152

497-517

472-492

447-467

7-12

5-10

4- 9

3- 8

18.0-20.0

13.3-15.3

8.5-10.5

17-23

—

110

LEGEND

HWG — Hot Water Generator

— No heating operation in this temperature range

— Dry Bulb

—

Table 23 — Typical 50PTH,PTV,PTD064,072 Unit Operating Pressures and Temperatures

FULL LOAD COOLING WITHOUT HWG ACTIVE

Water

FULL LOAD HEATING WITHOUT HWG ACTIVE

Water

ENTERING

WATER

FLOW

(Gpm/Ton)

Air

Temp

Drop (F)

Air

Temp

Rise (F)

WATER

TEMP (F)

(EWT)

Suction Discharge Super-

Sub-

cooling

(F)

Suction Discharge Super-

Sub-

cooling

(F)

Temp

Rise

(F)

Temp

Drop

(F)

Pressure Pressure

heat

(F)

Pressure Pressure

heat

(F)

(psig)

1.5

2.25

1.5

2.25

117-127

116-126

115-125

128-138

126-136

125-135

170-190

143-163

135-155

238-258

222-242

205-225

27-32

28-33

29-34

16-21

21-26

26-31

15-20

13-18

12-17

14-19

13-18

12-17

18.2-20.2

12.6-14.6

7.0- 9.0

20.5-22.5

14.9-16.9

9.2-11.2

17-23

21-27

66- 76

69- 79

72- 82

90-100

95-105

99-109

282-302

285-305

289-309

310-330

313-333

316-336

10-16

11-17

9-14

8-10

6- 8

4- 6

11.3-13.3

8.5-10.5

5.7- 7.7

19-25

20-26

24-30

25-31

26-32

10-15

12-17

1.5

2.25

135-145

134-144

133-143

315-335

296-316

276-296

10-15

12-17

15-20

14-19

13-18

11-16

21.0-23.0

15.5-17.5

10.0-12.0

22-28

115-125

120-130

126-136

337-357

341-361

345-365

12-18

14-19

15-20

14-16

10.6-12.6

7.3- 9.3

28-35

29-36

30-37

1.5

2.25

139-149

138-148

408-428

386-406

364-384

10-15

15-20

13-18

11-16

20.1-22.1

14.8-16.8

9.5-11.5

21-27

157-167

161-171

166-176

390-410

394-414

398-418

15-20

14-19

15-20

18.2-20.2

13.9-15.9

9.6-11.6

37-45

38-46

39-47

1.5

2.25

144-154

143-153

142-152

515-535

493-513

469-489

8-13

14-19

13-18

12-17

19.0-21.0

14.0-16.0

9.0-11.0

20-26

—

110

LEGEND

HWG — Hot Water Generator

— No heating operation in this temperature range

— Dry Bulb

—

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b. To program the beginning and end dates, scroll

down to the beginning month and press the enter

key. The softkeys (INCR and DECR) will activate

to increment the month in either direction, Jan,

Feb, March, etc.

c. Use number keys to select the day of month and

year.

Unit Start-Up with WSHP Open Controls —

The WSHP Open is a multi-protocol (default BACnet*) con-

troller with extensive features, flexible options and powerful

capabilities. The unit comes from the factory pre-programmed

and needs minimal set up to function in a BAS (Building

Automation System) system or provide additional capabilities

to Carrier's WSHP product line. Most settings on the controller

have factory defaults set for ease of installation. There are a

few settings that must be configured in the field and several

settings that can be adjusted if required by unique job condi-

tions. Refer to Appendix A — WSHP Open Screen Configura-

d. Push the OK softkey to finalize the data.

6. To view configuration settings:

a. Select the Config softkey.

tion. In order to configure the unit, a BACview display is

b. Select the Service Config softkey. Scroll through

the factory settings by using the up and down

arrow keys. See below for factory settings.

required. See Fig. 34.

NOTE: If the WSHP Open control has lost its programming,

all display pixels will be displayed on the SPT sensor. See the

WSHP Third Party Integration Guide.

Only the following settings will need to be

checked.

When the unit is OFF, the SPT sensor will indicate OFF.

When power is applied, the SPT sensor will indicate tempera-

ture in the space at 78 F.

• # of Fan Speeds — This should be set to "1" for

units with PSC motors and set to "3" for units with

ECM motors.

• Compressor Stages — This should be set to "1."

• Factory Dehumidification Reheat Coil — This

should be set to "none" unless the modulating hot

water reheat option is supplied in the unit, then set

to "installed."

To start-up a unit with WSHP Open controls:

1. To plug in the BACview handheld display into a SPT

sensor, point the two ears on the connector up and tilt the

bottom of the plug toward you. Insert the plug up into the

SPT sensor while pushing the bottom of the plug away

from you.

• The condenser water limit needs to be verified

depending on design parameters and application,

whether geothermal or boiler/tower.

2. BACview should respond with "Establishing Connec-

tion." The Home screen will then appear on the display

showing operating mode and space temperature. Press

any button to continue.

7. To view unit configuration settings:

a. Select the Unit Configuration softkey, then select

Unit.

See Appendix A — WSHP Open Screen Configuration

for the hierarchal structure of the WSHP Open controller.

All functions of the controller can be set from the Home

screen.

b. Scroll through the unit settings by using the up and

down arrow keys. Unit settings include:

• Fan Mode: Default Continuous

• Fan Delay:

3. When the Login is requested, type 1111 and push the OK

softkey. The Logout will then be displayed to indicate the

password was accepted.

• Minimum SAT Cooling: Default 50 F

• Maximum SAT Heating: Default 110 F

• Filter Service Alarm: Must be set from 0 to 9999 hr

4. To set the Clock if it is not already displayed:

8. To set local schedules:

a. Select System Settings from the Home screen, then

press Clockset.

b. Scroll to hour, minute and second using the arrow

keys. Use the number keypad to set actual time.

c. Scroll to day, month and year using arrow keys.

Use number keypad to set date.

a. Select the Schedule softkey from the Configuration

screen, then press enter.

b. Select Weekly, then press enter (7 schedules

available).

c. Select day and press enter.

d. Press enter again and select ADD or DEL (DECR

or INCR) set schedule.

5. To set Daylight Savings Time (DST):

a. Push the DST softkey. The display will indicate

02:00:060 which is equal to 2:00AM.

e. Enter ON/OFF time, then press continue.

a50-8444

Fig. 34 — BACview Display Interface

*Sponsored by ASHRAE (American Society of Heating, Refrigerat-

ing and Air Conditioning Engineers).

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f. Press OK to apply and save to a particular day of

the week.

g. Continue to add the same or different schedule spe-

cific days of the week.

the water level in the flush cart tank to drop below the

pump inlet line in order to prevent air from filling the line.

3. Maintain a fluid level in the tank above the return tee in

order to avoid air entering back into the fluid.

4. Shutting off the return valve that connects into the flush

cart reservoir will allow 50 psig surges to help purge air

pockets. This maintains the pump at 50 psig.

To add exceptions to the schedule:

i. Press Add softkey.

ii. Select exception type from following:

• Date

5. To purge, keep the pump at 50 psig until maximum

pumping pressure is reached.

• Date Range

6. Open the return valve to send a pressure surge through

the loop to purge any air pockets in the piping system.

7. A noticeable drop in fluid level will be seen in the flush

cart tank. This is the only indication of air in the loop.

• Week-N-Day

• Calender Reference

9. Go back to Home Screen.

10. Remove BACview cable from SPT sensor by reversing

NOTE: If air is purged from the system while using a

10 in. PVC flush tank, the level drop will only be 1 to

2 in. since liquids are incompressible. If the level drops

more than this, flushing should continue since air is still

being compressed in the loop. If level is less than 1 to

2 in., reverse the flow.

the process in Step 1.

11. Perform system test.

Flow Regulation — Flow regulation can be accom-

plished by two methods. Most water control valves have a flow

adjustment built into the valve. By measuring the pressure drop

through the unit heat exchanger, the flow rate can be deter-

mined. See Table 24. Adjust the water control valve until the

flow of 1.5 to 2 gpm is achieved. Since the pressure constantly

varies, two pressure gages may be needed in some

applications.

8. Repeat this procedure until all air is purged.

9. Restore power.

Antifreeze may be added before, during, or after the flush-

ing process. However, depending on when it is added in the

process, it can be wasted. Refer to the Antifreeze section for

more detail.

Loop static pressure will fluctuate with the seasons. Pres-

sures will be higher in the winter months than during the warm-

er months. This fluctuation is normal and should be considered

when charging the system initially. Run the unit in either

heating or cooling for several minutes to condition the loop to a

homogenous temperature.

When complete, perform a final flush and pressurize the

loop to a static pressure of 40 to 50 psig for winter months or

15 to 20 psig for summer months.

Table 24 — Coaxial Water Pressure Drop

WATER TEMPERATURE (F)

UNIT 50PTH, PTV,

GPM

30 F

50 F

70 F

90 F

PTD

Pressure Drop (psi)

4.0

6.0

7.0

8.0

4.0

6.0

8.0

9.0

5.5

1.5

3.1

4.1

5.1

1.2

2.6

4.5

5.7

1.1

2.2

3.9

4.5

0.5

1.9

3.9

4.8

1.3

2.6

3.4

4.3

1.0

2.5

4.2

5.2

0.9

2.1

3.6

4.2

0.3

1.8

3.5

4.3

1.1

2.3

3.0

3.8

0.8

2.3

4.0

4.8

0.8

2.0

3.2

3.8

0.2

1.7

3.2

3.9

1.0

2.1

2.7

3.4

0.6

2.1

3.7

4.4

0.7

1.8

3.1

3.5

0.1

1.6

2.9

3.5

026

038

049

After pressurization, be sure to remove the plug from the

end of the loop pump motor(s) to allow trapped air to be

discharged and to ensure the motor housing has been flooded.

Be sure the loop flow center provides adequate flow through

the unit by checking pressure drop across the heat exchanger.

Compare the results to the data in Table 24.

8.3

11.0

12.0

7.0

10.5

14.0

15.0

Antifreeze — In areas where entering loop temperatures

drop below 40 F or where piping will be routed through areas

subject to freezing, antifreeze is needed.

064,072

Alcohols and glycols are commonly used as antifreeze

agents. Freeze protection should be maintained to 15 F below

the lowest expected entering loop temperature. For example, if

the lowest expected entering loop temperature is 30 F, the

leaving loop temperature would be 22 to 25 F. Therefore, the

freeze protection should be at 15 F (30 F – 15 F = 15 F).

An alternative method is to install a flow control device.

These devices are typically an orifice of plastic material de-

signed to allow a specified flow rate that are mounted on the

outlet of the water control valve. Occasionally these valves

produce a velocity noise that can be reduced by applying some

back pressure. To accomplish this, slightly close the leaving

isolation valve of the well water setup.

IMPORTANT: All alcohols should be pre-mixed and

pumped from a reservoir outside of the building or

introduced under water level to prevent fuming.

WARNING

To avoid possible injury or death due to electrical shock,

open the power supply disconnect switch and secure it in

an open position before flushing system.

Calculate the total volume of fluid in the piping system. See

Table 25. Use the percentage by volume in Table 26 to deter-

mine the amount of antifreeze to use. Antifreeze concentration

should be checked from a well-mixed sample using a hydrom-

eter to measure specific gravity.

FREEZE PROTECTION SELECTION — The 30 F FP1

factory setting (water) should be used to avoid freeze damage

to the unit.

Flushing — Once the piping is complete, units require final

purging and loop charging. A flush cart pump of at least 1.5 hp

is needed to achieve adequate flow velocity in the loop to purge

air and dirt particles from the loop. Flush the loop in both direc-

tions with a high volume of water at a high velocity. Follow the

steps below to properly flush the loop:

Once antifreeze is selected, the JW3 jumper (FP1) should

be clipped on the control to select the low temperature (anti-

freeze 13 F) set point to avoid nuisance faults.

1. Verify power is off.

2. Fill loop with water from hose through flush cart before

using flush cart pump to ensure an even fill. Do not allow

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Table 25 — Approximate Fluid Volume (gal.)

per 100 Ft of Pipe

HEATING STAGE 2 — To enter Stage 2 mode, terminal W is

active (Y is already active). Also, the G terminal must be

active or the W terminal is disregarded. The compressor relay

will remain on and EH1 is immediately turned on. EH2 will

turn on after 10 minutes of continual stage 2 demand.

NOTE: EH2 will not turn on (or if on, will turn off) if FP1 tem-

perature is greater than 45 F and FP2 is greater than 110 F.

LOCKOUT MODE — The status LED will flash fast in

Lockout mode and the compressor relay will be turned off

immediately. Lockout mode can be “soft” reset via the Y input

or can be “hard” reset via the disconnect. The last fault causing

the lockout is stored in memory and can be viewed by entering

test mode.

PIPE

DIAMETER (in.)

VOLUME (gal.)

Copper

1.25

1.5

4.1

6.4

9.2

Rubber Hose

Polyethylene

3.9

/ IPS SDR11

2.8

4.5

8.0

10.9

18.0

8.3

10.9

17.0

1 IPS SDR11

1 / IPS SDR11

/ IPS SDR11

2 IPS SDR11

1 / IPS SCH40

2 IPS SCH40

LEGEND

LOCKOUT WITH EMERGENCY HEAT — While in Lock-

out mode, if W becomes active, then Emergency Heat mode

will occur.

IPS

— Internal Pipe Size

SCH — Schedule

SDR — Standard Dimensional Ratio

EMERGENCY HEAT — In Emergency Heat mode, terminal

W is active while terminal Y is not. Terminal G must be active

or the W terminal is disregarded. EH1 is immediately turned

on. EH2 will turn on after 5 minutes of continual emergency

heat demand.

NOTE: Volume of heat exchanger is approximately 1.0 gallon.

Table 26 — Antifreeze Percentages by Volume

MINIMUM TEMPERATURE FOR

FREEZE PROTECTION (F)

ANTIFREEZE

Methanol (%)

Units with Aquazone Deluxe D Control

EXTENDED COMPRESSOR OPERATION MONITOR —

If the compressor has been on for 4 continuous hours the con-

trol will automatically turn off the compressor relay and wait

the short cycle time protection time. All appropriate safeties,

including the low-pressure switch, will be monitored. If all

operations are normal and the compressor demand is still pres-

ent, the control will turn the compressor back on.

STANDBY/FAN ONLY — The compressor will be off. The

Fan Enable, Fan Speed, and reversing valve (RV) relays will be

on if inputs are present. If there is a Fan 1 demand, the Fan

Enable will immediately turn on. If there is a Fan 2 demand,

the Fan Enable and Fan Speed will immediately turn on.

100% USP Food Grade

Propylene Glycol (%)

Ethenol

Cooling Tower/Boiler Systems — These systems

typically use a common loop temperature maintained at 60 to

95 F. Carrier recommends using a closed circuit evaporative

cooling tower with a secondary heat exchanger between the

tower and the water loop. If an open type cooling tower is used

continuously, chemical treatment and filtering will be necessary.

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems — These systems al-

low water temperatures from 30 to 110 F. The external loop

field is divided up into 2 in. polyethylene supply and return

lines. Each line has valves connected in such a way that upon

system start-up, each line can be isolated for flushing using

only the system pumps. Locate air separation in the piping sys-

tem prior to the fluid re-entering the loop field.

NOTE: DIP switch 5 on S1 does not have an effect upon Fan 1

and Fan 2 outputs.

HEATING STAGE 1 — In Heating Stage 1 mode, the Fan

Enable and Compressor relays are turned on immediately.

Once the demand is removed, the relays are turned off and the

control reverts to Standby mode. If there is a master/slave or

dual compressor application, all compressor relays and related

functions will operate per their associated DIP switch 2 setting

on S1.

OPERATION

Power Up Mode — The unit will not operate until all the

inputs, terminals and safety controls are checked for normal

operation.

NOTE: The compressor will have a 5-minute anti-short cycle

upon power up.

HEATING STAGE 2 — In Heating Stage 2 mode, the Fan

Enable and Compressor relays are remain on. The Fan Speed

relay is turned on immediately and turned off immediately

once the demand is removed. The control reverts to Heating

Stage 1 mode. If there is a master/slave or dual compressor

application, all compressor relays and related functions will

operate per their associated DIP switch 2 setting on S1.

Units with Aquazone™ Complete C Control

STANDBY — Y and W terminals are not active in Standby

mode, however the O and G terminals may be active, depend-

ing on the application. The compressor will be off.

COOLING — Y and O terminals are active in Cooling mode.

After power up, the first call to the compressor will initiate a

5 to 80 second random start delay and a 5-minute anti-short

cycle protection time delay. After both delays are complete, the

compressor is energized.

NOTE: On all subsequent compressor calls the random start

delay is omitted.

HEATING STAGE 1 — Terminal Y is active in heating

stage 1. After power up, the first call to the compressor will

initiate a 5 to 80 second random start delay and a 5-minute

anti-short cycle protection time delay. After both delays are

complete, the compressor is energized.

HEATING STAGE 3 — In Heating Stage 3 mode, the Fan

Enable, Fan Speed and Compressor relays remain on. The EH1

output is turned on immediately. With continuing Heat Stage 3

demand, EH2 will turn on after 10 minutes. EH1 and EH2 are

turned off immediately when the Heating Stage 3 demand is re-

moved. The control reverts to Heating Stage 2 mode.

The output signal EH2 will be off if FP1 is greater than 45 F

AND FP2 (when shorted) is greater than 110 F during Heating

Stage 3 mode. This condition will have a 30-second recogni-

tion time. Also, during Heating Stage 3 mode, EH1, EH2, Fan

Enable, and Fan Speed will be ON if G input is not active.

EMERGENCY HEAT — In Emergency Heat mode, the Fan

Enable and Fan Speed relays are turned on. The EH1 output is

turned on immediately. With continuing Emergency Heat de-

mand, EH2 will turn on after 5 minutes. Fan Enable and Fan

Speed relays are turned off after a 60-second delay. The control

reverts to Standby mode.

NOTE: On all subsequent compressor calls the random start

delay is omitted.

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Output EH1, EH2, Fan Enable, and Fan Speed will be ON if

the G input is not active during Emergency Heat mode.

Occupancy Input Contact — The WSHP Open controller has

the capability to use an external dry contact closure to deter-

mine the occupancy status of the unit. The Occupancy Sched-

ules will need to be disabled in order to utilize the occupancy

contact input.

COOLING STAGE 1 — In Cooling Stage 1 mode, the Fan

Enable, compressor and RV relays are turned on immediately.

If configured as stage 2 (DIP switch set to OFF) then the com-

pressor and fan will not turn on until there is a stage 2 demand.

The Fan Enable and compressor relays are turned off immedi-

ately when the Cooling Stage 1 demand is removed. The con-

trol reverts to Standby mode. The RV relay remains on until

there is a heating demand. If there is a master/slave or dual

compressor application, all compressor relays and related func-

tions will track with their associated DIP switch 2 on S1.

COOLING STAGE 2 — In Cooling Stage 2 mode, the Fan

Enable, compressor and RV relays remain on. The Fan Speed

relay is turned on immediately and turned off immediately

once the Cooling Stage 2 demand is removed. The control

reverts to Cooling Stage 1 mode. If there is a master/slave or

dual compressor application, all compressor relays and related

functions will track with their associated DIP switch 2 on S1.

NIGHT LOW LIMIT (NLL) STAGED HEATING — In NLL

staged Heating mode, the override (OVR) input becomes ac-

tive and is recognized as a call for heating and the control will

immediately go into a Heating Stage 1 mode. With an addition-

al 30 minutes of NLL demand, the control will go into Heating

Stage 2 mode. With another additional 30 minutes of NLL

demand, the control will go into Heating Stage 3 mode.

NOTE: Scheduling can only be controlled from one source.

BAS (Building Automation System) On/Off

—

BAS

system that supports network scheduling can control the unit

through a network communication and the BAS scheduling

function once the Occupancy Schedules have been disabled.

NOTE: Scheduling can either be controlled via the unit or the

BAS, but not both.

INDOOR FAN — The indoor fan will operate in any one of

three modes depending on the user configuration selected.

Fan mode can be selected as Auto, Continuous, or Always

On. In Auto mode, the fan is in intermittent operation during

both occupied and unoccupied periods. Continuous fan mode

is intermittent during unoccupied periods and continuous dur-

ing occupied periods. Always On mode operates the fan con-

tinuously during both occupied and unoccupied periods. In the

default mode, Continuous, the fan will be turned on whenever

any one of the following is true:

• The unit is in occupied mode as determined by its occu-

pancy status.

• There is a demand for cooling or heating in the unoccu-

pied mode.

• There is a call for dehumidification (optional).

When power is reapplied after a power outage, there will be

a configured time delay of 5 to 600 seconds before starting the

fan. There are also configured fan delays for Fan On and Fan

Off. The Fan On delay defines the delay time (0 to 30 seconds;

default 10) before the fan begins to operate after heating or

cooling is started while the Fan Off delay defines the delay

time (0 to 180 seconds; default 45) the fan will continue to op-

erate after heating or cooling is stopped. The fan will continue

to run as long as the compressors, heating stages, or the dehu-

midification relays are on. If the SPT failure alarm or conden-

sate overflow alarm is active; the fan will be shut down imme-

diately regardless of occupancy state or demand.

Automatic Fan Speed Control — The WSHP Open controller

is capable of controlling up to three fan speeds using the ECM

(electronically commutated motor). The motor will operate at

the lowest speed possible to provide quiet and efficient fan op-

eration with the best latent capability. The motor will increase

speed if additional cooling or heating is required to obtain the

desired space temperature set point. The control increases the

motor's speed as the space temperature rises above the cooling

or below the heating set point. The amount of space tempera-

ture increase above or below the set point required to increase

the fan speed is user configurable in the set point.

Units with WSHP Open Multiple Protocol —

The WSHP Open multi-protocol controller will control me-

chanical cooling, heating and waterside economizer outputs

based on its own space temperature input and set points. An

optional CO IAQ (indoor air quality) sensor mounted in the

space can maximize the occupant comfort. The WSHP Open

controller has its own hardware clock that is automatically set

when the heat pump software is downloaded to the board. Oc-

cupancy types are described in the scheduling section below.

The following sections describe the functionality of the WSHP

Open multi-protocol controller. All point objects referred to in

this sequence of operation will be referenced to the objects as

viewed in the BACview handheld user interface.

SCHEDULING — Scheduling is used to start/stop the unit

based on a time period to control the space temperature to spec-

ified occupied heating and cooling set points. The controller is

defaulted to control by occupied set points all the time, until ei-

ther a time schedule is configured with BACview , Field Assis-

tant, i-Vu Open, or a third party control system to enable/dis-

able the BAS (Building Automation System) on/off point. The

local time and date must be set for these functions to operate

properly. The occupancy source can be changed to one of the

following:

Occupancy Schedules — The controller will be occupied 24/7

until a time schedule has been configured using either Field

The Low Fan speed range is configured by the width of the

Yellow (for cooling) and Light Blue (for heating) setpoint

bands. The fan will operate at low speed as long as the space

temperature remains within the yellow or light blue band

range. The Medium Fan speed range is determined by the Or-

ange and Dark Blue setpoint band. The fan will operate at me-

dium speed when the space temperature enters this range. If the

space temperature rises or falls into the red range, the fan will

operate at High Fan speed.

Assistant, i-Vu Open, BACview or a third party control sys-

tem to enable/disable the BAS on/off point. The BAS point can

be disabled by going to Config, then Unit, then Occupancy

Schedules and changing the point from enable to disable then

clicking OK.

NOTE: This point must be enabled in order for the i-Vu Open,

Field Assistant, or BACview control system to assign a time

schedule to the controller.

Schedule_schedule — The unit will operate according to the

schedule configured and stored in the unit. The schedule is

As the temperature returns toward setpoint, a configurable

hysteresis is used to prevent the fan from changing speeds er-

ratically. The default value is 0.5° F (shown above).

Also, the control will increase the fan speed as the Supply

Air Temperature approaches the configured Minimum or Max-

imum SAT limits.

Fan Speed Control (During Heating) — Whenever heat is re-

quired and active, the control continuously monitors the sup-

ply-air temperature to verify it does not rise above the config-

accessible via the BACview Handheld tool, i-Vu Open, or

Field Assistant control system. The daily schedule consists of a

start/stop time (standard or 24-hour mode) and seven days of

the week, starting with Monday and ending on Sunday. To

enter a daily schedule, navigate to Config, then Sched, then

enter BACview Admin Password (1111), then go to

schedule_schedule. From here, enter either a Weekly or Excep-

tion schedule for the unit.

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ured maximum heating SAT limit (110 F default). As the SAT

approaches this value, the control will increase the fan speed as

required to ensure the SAT will remain within the limit. This

feature provides the most quiet and efficient operation by oper-

ating the fan at the lowest speed possible.

Fan Speed Control (During Cooling) — Whenever mechani-

cal cooling is required and active, the control continuously

monitors the supply-air temperature to verify it does not fall be-

low the configured minimum cooling SAT limit (50 F default).

As the SAT approaches this value, the control will increase the

fan speed as required to ensure the SAT will remain within the

limit. The fan will operate at lowest speed to maximize latent

capacity during cooling.

COOLING — The WSHP Open controller will operate one or

two stages of compression to maintain the desired cooling set

point. The compressor outputs are controlled by the PI (propor-

tional-integral) cooling loop and cooling stages capacity algo-

rithm. They will be used to calculate the desired number of

stages needed to satisfy the space by comparing the space tem-

perature (SPT) to the appropriate cooling set point. The water

side economizer, if applicable, will be used for first stage cool-

ing in addition to the compressor(s). The following conditions

must be true in order for the cooling algorithm to run:

HEATING — The WSHP Open controller will operate one or

two stages of compression to maintain the desired heating set

point. The compressor outputs are controlled by the heating PI

(proportional-integral) loop and heating stages capacity algo-

rithm. They will be used to calculate the desired number of

stages needed to satisfy the space by comparing the space tem-

perature (SPT) to the appropriate heating set point. The follow-

ing conditions must be true in order for the heating algorithm to

run:

• Heating is set to Enable.

• Cooling mode is not active and the compressor time

guard has expired.

• Condensate overflow input is normal.

• If occupied, the SPT is less than the occupied heating set

point.

• Space temperature reading is valid.

• If unoccupied, the SPT is less than the unoccupied heat-

ing set point.

• OAT (if available) is less than the heating lockout

temperature.

If all the above conditions are met, the heating outputs will

be energized as required, otherwise they will be deenergized. If

the heating is active and should the SAT approach the maxi-

mum SAT limit, the fan will be indexed to the next higher

speed. Should this be insufficient, and the SAT rises further

reaching the maximum heating SAT limit, the fan will be

indexed to the maximum speed. If the SAT still continues to

rise 5F above the maximum limit, all heating stages will be

disabled.

• Cooling is set to Enable.

• Heating mode is not active and the compressor time

guard has expired.

• Condensate overflow input is normal.

• If occupied, the SPT is greater than the occupied cooling

set point.

• Space temperature reading is valid.

• If unoccupied, the SPT is greater than the unoccupied

cooling set point.

• If economizer cooling is available and active and the

economizer alone is insufficient to provide enough cool-

ing.

• OAT (if available) is greater than the cooling lockout

temperature.

During Heating mode, the reversing valve output will be

held in the heating position (either B or O type as configured)

even after the compressor is stopped. The valve will not switch

position until the Cooling mode is required.

The configuration screens contain the maximum SAT

parameter as well as heating lockout based on outdoor-air

temperature (OAT); both can be adjusted to meet various

specifications.

If all the above conditions are met, the compressors will be

energized as required, otherwise they will be deenergized. If

cooling is active and should the SAT approach the minimum

SAT limit, the fan will be indexed to the next higher speed.

Should this be insufficient and if the SAT falls further (equal to

the minimum SAT limit), the fan will be indexed to the maxi-

mum speed. If the SAT continues to fall 5F below the mini-

mum SAT limit, all cooling stages will be disabled.

During Cooling mode, the reversing valve output will be

held in the cooling position (either B or O type as configured)

even after the compressor is stopped. The valve will not switch

position until the Heating mode is required.

The configuration screens contain the minimum SAT

parameter as well as cooling lockout based on outdoor-air

temperature (OAT) Both can be adjusted to meet various

specifications.

There is a 5-minute off time for the compressor as well as a

5-minute time delay when staging up to allow the SAT to

achieve a stable temperature before energizing a second stage

of capacity. Likewise, a 45-second delay is used when staging

down.

After a compressor is staged off, it may be restarted again

after a normal time-guard period of 5 minutes and if the sup-

ply-air temperature has increased above the minimum supply-

air temperature limit.

The WSHP Open controller provides a status input to moni-

tor the compressor operation. The status is monitored to deter-

mine if the compressor status matches the commanded state.

This input is used to determine if a refrigerant safety switch or

other safety device has tripped and caused the compressor to

stop operating normally. If this should occur, an alarm will be

generated to indicate the faulted compressor condition.

There is a 5-minute off time for the compressor as well as a

5-minute time delay when staging up to allow the SAT to

achieve a stable temperature before energizing a second stage

of capacity. Likewise, a 45-second delay is used when staging

down.

After a compressor is staged off, it may be restarted again

after a normal time-guard period of 5 minutes and if the sup-

ply-air temperature has fallen below the maximum supply air

temperature limit.

The WSHP Open controller provides a status input to moni-

tor the compressor operation. The status is monitored to deter-

mine if the compressor status matches the commanded state.

This input is used to determine if a refrigerant safety switch or

other safety device has tripped and caused the compressor to

stop operating normally. If this should occur, an alarm will be

generated to indicate the faulted compressor condition. Also, if

auxiliary heat is available (see below), the auxiliary heat will

operate to replace the reverse cycle heating and maintain the

space temperature as required.

AUXILIARY HEAT — The WSHP Open controller can con-

trol a two-position, modulating water, or steam valve connect-

ed to a coil on the discharge side of the unit and supplied by a

boiler or a single-stage ducted electric heater in order to main-

tain the desired heating set point. Should the compressor capac-

ity be insufficient or a compressor failure occurs, the auxiliary

heat will be used. Unless the compressor fails, the auxiliary

heat will only operate to supplement the heat provided by the

compressor if the space temperature falls more than one degree

below the desired heating set point (the amount is configu-

rable). The heat will be controlled so the SAT will not exceed

the maximum heating SAT limit.

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Auxiliary Modulating Hot Water/Steam Heating Reheat

— The control can modulate a hot water or steam valve con-

nected to a coil on the discharge side of the unit and supplied

by a boiler in order to maintain the desired heating set point

should the compressor capacity be insufficient or a compressor

failure occurs. Unless a compressor fault condition exists, the

valve will only operate to supplement the heat provided by the

compressor if the space temperature falls more than one degree

below the desired heating set point. The valve will be con-

trolled so the SAT will not exceed the maximum heating SAT

limit.

Two-Position Hot Water/Steam Heating Reheat — The con-

trol can operate a two-position, NO or NC, hot water or steam

valve connected to a coil on the discharge side of the unit and

supplied by a boiler in order to maintain the desired heating set

point should the compressor capacity be insufficient or a com-

pressor failure occurs. Unless a compressor fault condition ex-

ists, the valve will only open to supplement the heat provided

by the compressor if the space temperature falls more than one

degree below the desired heating set point. The valve will be

controlled so the SAT will not exceed the maximum heating

SAT limit. The heat stage will also be subject to a 2-minute

minimum OFF time to prevent excessive valve cycling.

Single Stage Electric Auxiliary Heat — The control can op-

erate a field-installed single stage of electric heat installed on

the discharge side of the unit in order to maintain the desired

heating set point should the compressor capacity be insufficient

or a compressor failure occurs. Unless a compressor fault con-

dition exists, the heat stage will only operate to supplement the

heat provided by the compressor if the space temperature falls

more than one degree below the desired heating set point. The

heat stage will be controlled so the SAT will not exceed the

maximum heating SAT limit. The heat stage will also be sub-

ject to a 2-minute minimum OFF time to prevent excessive

cycling.

units that are equipped with the modulating hot water reheat

(HWR) option. This function requires an accessory space rela-

tive humidity sensor. When using a relative humidity sensor to

control dehumidification during occupied or unoccupied times,

the dehumidification set points are used accordingly. When the

indoor relative humidity becomes greater than the dehumidifi-

cation set point, a dehumidification demand will be acknowl-

edged. Once acknowledged, the dehumidification output will

be energized, bringing on the supply fan (medium speed), me-

chanical cooling, and the integral hot water reheat coil. The

controls will engage Cooling mode and waste heat from the

compressor cooling cycle will be returned to the reheat coil si-

multaneously, meaning that the reversing valve is causing the

compressor to operate in the Cooling mode. During Cooling

mode, the unit cools, dehumidifies, and disables the HWR coil;

however, once the call for cooling has been satisfied and there

is still a call for dehumidification, the unit will continue to op-

erate using the reheat mode and HWR coil.

WATERSIDE ECONOMIZER — The WSHP Open control-

ler has the capability of providing modulating or two-position

water economizer operation (for a field-installed economizer

coil mounted to the entering air side of the unit and connected

to the condenser water loop) in order to provide free cooling

(or preheating) when water conditions are optimal. Water econ-

omizer settings can be accessed through the equipment status

screen. The following conditions must be true for economizer

operation:

• SAT reading is available.

• LWT reading is available.

• If occupied, the SPT is greater than the occupied cooling

set point or less than the occupied heating set point and

the condenser water is suitable.

• Space temperature reading is valid.

• If unoccupied, the SPT is greater than the unoccupied

cooling set point or less than the unoccupied heating set

point and the condenser water is suitable.

INDOOR AIR QUALITY (IAQ) AND DEMAND CON-

TROLLED VENTILATION (DCV) — If the optional in-

door air quality sensor is installed, the WSHP Open controller

can maintain indoor air quality via a modulating OA damper

providing demand controlled ventilation. The control operates

the modulating OA damper during occupied periods. The con-

Modulating Water Economizer Control — The control has

the capability to modulate a water valve to control condenser

water flowing through a coil on the entering air side of the unit.

Cooling — The purpose is to provide an economizer cooling

function by using the water loop when the entering water loop

temperature is suitable (at least 5F below space temperature).

If the water loop conditions are suitable, then the valve will

modulate open as required to maintain a supply-air temperature

that meets the load conditions. Should the economizer coil ca-

pacity alone be insufficient for a period greater than 5 minutes,

or should a high humidity condition occur, then the compressor

will also be started to satisfy the load. Should the SAT ap-

proach the minimum cooling SAT limit, the economizer valve

will modulate closed during compressor operation.

Heating — Additionally, the control will modulate the water

valve should the entering water loop temperature be suitable

for heating (at least 5F above space temperature) and heat is

required. The valve will be controlled in a similar manner ex-

cept to satisfy the heating requirement. Should the economizer

coil capacity alone be insufficient to satisfy the space load con-

ditions for more than 5 minutes, then the compressor will be

started to satisfy the load. Should the SAT approach the maxi-

mum heating SAT limit, the economizer valve will modulate

closed during compressor operation.

trol monitors the CO level and compares it to the configured

set points, adjusting the ventilation rate as required. The control

provides proportional ventilation to meet the requirements of

ASHRAE (American Society of Heating, Refrigerating and

Air Conditioning Engineers) specifications by providing a base

ventilation rate and then increasing the rate as the CO level in-

creases. The control will begin to proportionally increase venti-

lation when the CO level rises above the start ventilation set

point and will reach the full ventilation rate when the CO level

is at or above the maximum set point. A user-configurable min-

imum damper position ensures that proper base ventilation is

delivered when occupants are not present. The IAQ configura-

tions can be accessed through the configuration screen. The

following conditions must be true in order for this algorithm to

run:

• Damper control is configured for DCV.

• The unit is in an occupied mode.

• The IAQ sensor reading is greater than the DCV start

control set point.

The control has four user adjustable set points: DCV start

control set point, DCV maximum control set point, minimum

damper position, and DCV maximum damper position.

Two-Position OA Damper — The control can be configured

to operate a ventilation damper in a two-position ventilation

mode to provide the minimum ventilation requirements during

occupied periods.

Two-Position Water Economizer Control — The control has

the capability to control a NO or NC, two-position water valve

to control condenser water flow through a coil on the entering

air side of the unit.

Cooling — The purpose is to provide a cooling economizer

function directly from the condenser water loop when the en-

tering water loop temperature is suitable (at least 5 F below

space temperature). If the optional coil is provided and the wa-

ter loop conditions are suitable, then the valve will open to pro-

DEHUMIDIFCATION — The WSHP Open controller will

provide occupied and unoccupied dehumidification only on

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vide cooling to the space when required. Should the capacity

be insufficient for a period greater than 5 minutes, or should a

high humidity condition occur, then the compressor will be

started to satisfy the load. Should the SAT reach the minimum

cooling SAT limit, the economizer valve will close during

compressor operation.

Heating — Additionally, the economizer control will open the

water valve should the entering water loop temperature be suit-

able for heating (at least 5 F above space temperature) and

heat is required. The valve will be controlled in a similar man-

ner except to satisfy the heating requirement. Should the coil

capacity be insufficient to satisfy the space load for more than

5 minutes, then the compressor will be started to satisfy the

load. Should the SAT reach the maximum heating SAT limit,

the economizer valve will close during compressor operation.

Table 27 — Complete C Control Current LED

Status and Alarm Relay Operations

LED STATUS

DESCRIPTION OF OPERATION

ALARM RELAY

Normal Mode

Open

Cycle

(closed 5 sec.,

open 25 sec.)

Normal Mode with

PM Warning

Complete C Control is

non-functional

Off

Open

Slow Flash

Fast Flash

Fault Retry

Lockout

Open

Closed

Open,

(Closed after

15 minutes)

Slow Flash

Over/Under Voltage Shutdown

Flashing Code 1 Test Mode — No fault in memory

Cycling Code 1

Test Mode —

HP Fault in memory

Flashing Code 2

Cycling Code 2

Test Mode —

DEMAND LIMIT — The WSHP Open controller has the

ability to accept three levels of demand limit from the network.

In response to a demand limit, the unit will decrease its heating

set point and increase its cooling set point to widen the range in

order to immediately lower the electrical demand. The amount

of temperature adjustment in response is user adjustable for

both heating and cooling and for each demand level. The re-

sponse to a particular demand level may also be set to zero.

Flashing Code 3

Cycling Code 3

Cycling Code 4

Cycling Code 5

Cycling Code 6

LP Fault in memory

Test Mode —

FP1 Fault in memory

Test Mode —

FP2 Fault in memory

Test Mode —

CO Fault in memory

Test Mode — Over/Under

shutdown in memory

Flashing Code 4

Flashing Code 5

Flashing Code 6

Flashing Code 7

Cycling Code 7

Cycling Code 8

Cycling Code 9

Flashing Code 8

Flashing Code 9

Test Mode — PM in memory

Test Mode — FP1/FP2

Swapped Fault in memory

CONDENSER WATER LINKAGE — The control pro-

vides optimized water loop operation using an universal con-

troller (UC) open loop controller. Loop pump operation is auto-

matically controlled by WSHP equipment occupancy sched-

ules, unoccupied demand and tenant override conditions.

Positive pump status feedback prevents nuisance fault trips.

The condenser water linkage operates when a request for con-

denser water pump operation is sent from each WSHP to the

loop controller. This request is generated whenever any WSHP

is scheduled to be occupied, is starting during optimal start (for

warm-up or pull down prior to occupancy), there is an unoccu-

pied heating or cooling demand, or a tenant pushbutton over-

ride. At each WSHP, the water loop temperature and the loop

pump status is given. The WSHP will NOT start a compressor

until the loop pumps are running or will shutdown the com-

pressors should the pumps stop. This prevents the WSHP from

operating without water flow and thus tripping out on refriger-

ant pressure, causing a lockout condition. The WSHP Open

controller control will prevent this from occurring. Also, the

loop controller can be configured to start the pumps only after a

configurable number of WSHPs are requesting operation (from

1-"N"). This can be used to prevent starting the entire loop op-

eration for only one WSHP. Meanwhile, the WSHPs will not

operate if the loop pump status is off and therefore the WSHP

compressor will not run.

LEGEND

—

Condensate Overflow

Freeze Protection

High Pressure

Light-Emitting Diode

Low Pressure

Performance Monitor

LED

NOTES:

1. Slow flash is 1 flash every 2 seconds.

2. Fast flash is 2 flashes every 1 second.

3. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by

a 10-second pause. This sequence will repeat continually until the fault is

cleared.

Table 28 — Complete C Control LED Code and

Fault Descriptions

LED

CODE

FAULT

DESCRIPTION

No fault in memory

There has been no fault since

the last power-down to power-

up sequence

HP switch opens instantly

LP switch opens for

30 continuous seconds before

or during a call (bypassed for

first 60 seconds)

FP1 below Temp limit for

30 continuous seconds

(bypassed for first 60 seconds of

operation)

High-Pressure Switch

Low-Pressure Switch

Freeze Protection Coax

— FP1

COMPLETE C AND DELUXE D BOARD

SYSTEM TEST

Freeze Protection Air Coil — FP2 below Temp limit for

FP2

30 continuous seconds

(bypassed for first 60 seconds of

operation)

Sense overflow (grounded) for

30 continuous seconds

"R" power supply is <19VAC or

>30VAC

Performance Monitor Warning

has occurred.

Test mode provides the ability to check the control opera-

tion in a timely manner. The control enters a 20-minute test

mode by momentarily shorting the test terminals. All time de-

lays are sped up 15 times. The following operations are com-

mon to both Complete C and Deluxe D controls.

Condensate overflow

Over/Under Voltage

(Autoreset) Shutdown

PM Warning

Test Mode — To enter Test mode, cycle the fan 3 times

within 60 seconds. The LED will flash a code representing the

last fault when entering the Test mode. The alarm relay will

also power on and off during Test mode. See Tables 27 and 28.

To exit Test mode, short the terminals for 3 seconds or cycle

the fan 3 times within 60 seconds.

NOTE: The flashing code and alarm relay cycling code will

both have the same numerical label. For example, flashing

code 1 will have an alarm relay cycling code 1. Code 1 indi-

cates the control has not faulted since the last power off to

power on sequence.

FP1 and FP2

FP1 temperature is higher than

FP2 in heating/test mode, or

FP2 temperature is higher than

FP1 in cooling/test mode.

Thermistors are swapped

LEGEND

—

Freeze Protection

High Pressure

LED

—

Light-Emitting Diode

Low Pressure

Performance Monitor

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Once tests are complete, set unit test back to disable. Unit will

automatically reset to disable after 1 hour.

WSHP Open Test Mode — To enter WSHP Open test

mode, navigate from the BACview home screen to the config-

uration screen. Choose the service screen and enable unit test.

The controller will then test the following:

FAN TEST — Tests all fan speeds, sequences fan from low to

high, and operates each speed for one minute. Resets to disable

on completion.

COMPRESSOR TEST — Tests compressor cooling and

heating operation. Sequences cooling stage 1 then cooling

stage 2 followed by heating stage 2 then reduces capacity to

heating stage 1. Operates for 1 minute per step.

DEHUMIDIFICATION TEST — Tests dehumidification

mode. Operates for 2 minutes.

Retry Mode — In Retry mode, the status LED will start to

flash slowly to signal that the control is trying to recover from

an input fault. The control will stage off the outputs and try to

again satisfy the thermostat used to terminal Y. Once the ther-

mostat input calls are satisfied, the control will continue normal

operation.

NOTE: If 3 consecutive faults occur without satisfying the

thermostat input call to terminal Y, the control will go into

lockout mode. The last fault causing the lockout is stored in

memory and can be viewed by entering Test mode.

Aquazone™ Deluxe D Control LED Indica-

tors — There are 3 LED indicators on the Deluxe D control:

STATUS LED — Status LED indicates the current status or

mode of the D control. The Status LED light is green.

TEST LED — Test LED will be activated any time the D

control is in test mode. The Test LED light is yellow.

FAULT LED — Fault LED light is red. The fault LED will

always flash a code representing the last fault in memory. If

there is no fault in memory, the fault LED will flash code 1 and

appear as one fast flash alternating with a 10-second pause.

See Table 29.

AUXILIARY HEATING TEST — Tests auxiliary heat.

Sequences fan on and enables heating coil for 1 minute.

H O ECONOMIZER TEST — Tests entering/returning

water loop economizer operation. Sequences fan and opens

economizer water valve for one minute.

OPEN VENT DAMPER 100% TEST — Tests outside air

(OA) damper operation.

PREPOSITION OA DAMPER — Prepositions OA damper

actuator to set proper preload.

NOTE: The auxiliary heating test, H O economizer test, open

vent damper 100% test, and preposition OA damper features

will not be visible on the screen unless configured.

Table 29 — Aquazone Deluxe D Control Current LED Status and Alarm Relay Operations

STATUS LED

(Green)

TEST LED

(Yellow)

DESCRIPTION

Normal Mode

FAULT LED (Red)

Flash Last Fault Code in Memory

Flashing Code 8

ALARM RELAY

Off

Open

Cycle (closed 5 sec,

open 25 sec, …)

Normal Mode with PM

Off

Deluxe D Control

is non-functional

Off

Open

Test Mode

Night Setback

ESD

—

Flash Last Fault Code in Memory

Flashing Code 1

Cycling Appropriate Code

Flashing Code 2

Flashing Code 3

Flashing Code 4

—

Open

Invalid T-stat Inputs

No Fault in Memory

HP Fault

—

Off

Slow Flash

Fast Flash

Flashing Code 2

Flashing Code 3

Flashing Code 4

Flashing Code 5

Flashing Code 6

Flashing Code 7

Flashing Code 2

Flashing Code 3

LP Fault

FP1 Fault

FP2 Fault

CO Fault

Open

Over/Under Voltage

HP Lockout

LP Lockout

FP1 Lockout

FP2 Lockout

CO Lockout

Open (closed after 15 minutes)

Closed

Flashing Code 4

Flashing Code 5

Flashing Code 6

LEGEND

NOTES:

1. If there is no fault in memory, the Fault LED will flash code 1.

2. Codes will be displayed with a 10-second Fault LED pause.

3. Slow flash is 1 flash every 2 seconds.

CO — Condensate Overflow

ESD — Emergency Shutdown

FP — Freeze Protection

HP — High Pressure

LP — Low Pressure

PM — Performance Monitor

4. Fast flash is 2 flashes every 1 second.

5. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes

followed by a 10-second pause. This sequence will repeat con-

tinually until the fault is cleared.

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SERVICE

Compressor — Conduct annual amperage checks to en-

sure that amp draw is no more than 10% greater than indicated

on the serial plate data.

Perform the procedures outlined below periodically, as

indicated.

Fan Motors — All units have lubricated fan motors. Fan

motors should never be lubricated unless obvious, dry

operation is suspected. Periodic maintenance oiling is NOT

recommended as it will result in dirt accumulating in the excess

oil and cause eventual motor failure. Conduct annual dry oper-

ation check and amperage check to ensure amp draw is no

more than 10% greater than indicated on serial plate data.

WARNING

To prevent injury or death due to electrical shock or contact

with moving parts, open unit disconnect switch before ser-

vicing unit.

IMPORTANT: When a compressor is removed from this

unit, system refrigerant circuit oil will remain in the com-

pressor. To avoid leakage of compressor oil, the refrigerant

lines of the compressor must be sealed after it is removed.

Condensate Drain Cleaning — Clean the drain line

and unit drain pan at the start of each cooling season. Check

flow by pouring water into drain. Be sure trap is filled to main-

tain an air seal.

Air Coil Cleaning — Remove dirt and debris from evap-

orator coil as required by condition of the coil. Clean coil with

a stiff brush, vacuum cleaner, or compressed air. Use a fin

comb of the correct tooth spacing when straightening mashed

or bent coil fins.

IMPORTANT: All refrigerant discharged from this unit

must be recovered without exception. Technicians must fol-

low industry accepted guidelines and all local, state and fed-

eral statutes for the recovery and disposal of refrigerants.

Condenser Cleaning — Water-cooled condensers may

require cleaning of scale (water deposits) due to improperly

maintained closed-loop water systems. Sludge build-up may

need to be cleaned in an open water tower system due to

induced contaminants.

IMPORTANT: To avoid the release of refrigerant into the

atmosphere, the refrigerant circuit of this unit must only be

serviced by technicians who meet local, state and federal

proficiency requirements.

Local water conditions may cause excessive fouling or

pitting of tubes. Condenser tubes should therefore be cleaned at

least once a year, or more often if the water is contaminated.

Filters — Filters must be clean for maximum performance.

Inspect filters every month under normal operating conditions.

Replace when necessary.

Proper water treatment can minimize tube fouling and

pitting. If such conditions are anticipated, water treatment

analysis is recommended. Refer to the Carrier System Design

Manual, Part 5, for general water conditioning information.

IMPORTANT: Units should never be operated without

a filter.

Water Coil — Keep all air out of the water coil. Check

open loop systems to be sure the well head is not allowing air

to infiltrate the water line. Always keep lines airtight.

Inspect heat exchangers regularly, and clean more frequent-

ly if the unit is located in a “dirty” environment. Keep the heat

exchanger full of water at all times. Open loop systems should

have an inverted P trap placed in the discharge line to keep

water in the heat exchanger during off cycles. Closed loop

systems must have a minimum of 15 psig during the summer

and 40 psig during the winter.

CAUTION

Follow all safety codes. Wear safety glasses and rubber

gloves when using inhibited hydrochloric acid solution.

Observe and follow acid manufacturer’s instructions.

Clean condensers with an inhibited hydrochloric acid solu-

tion. The acid can stain hands and clothing, damage concrete,

and, without inhibitor, damage steel. Cover surroundings to

guard against splashing. Vapors from vent pipe are not harmful,

but take care to prevent liquid from being carried over by the

gases.

Check P trap frequently for proper operation.

CAUTION

Warm solution acts faster, but cold solution is just as effec-

tive if applied for a longer period.

To avoid fouled machinery and extensive unit clean-up,

DO NOT operate units without filters in place. DO NOT

use equipment as a temporary heat source during

construction.

GRAVITY FLOW METHOD — Do not add solution faster

than vent can exhaust the generated gases.

When condenser is full, allow solution to remain overnight,

then drain condenser and flush with clean water. Follow acid

manufacturer’s instructions. See Fig. 35.

FORCED CIRCULATION METHOD — Fully open vent

pipe when filling condenser. The vent may be closed when

condenser is full and pump is operating. See Fig. 36.

Regulate flow to condenser with a supply line valve. If

pump is a nonoverloading type, the valve may be fully closed

while pump is running.

Condensate Drain Pans — Check condensate drain

pans for algae growth twice a year. If algae growth is apparent,

consult a water treatment specialist for proper chemical treat-

ment. Applying an algaecide every three months will typically

eliminate algae problems in most locations.

Refrigerant System — Verify air and water flow rates

are at proper levels before servicing. To maintain sealed circuit-

ry integrity, do not install service gages unless unit operation

appears abnormal.

Check to see that unit is within the superheat and subcool-

ing temperature ranges shown in Tables 20-23. If the unit is not

within these ranges, recover and reweigh in refrigerant charge.

For average scale deposit, allow solution to remain in con-

denser overnight. For heavy scale deposit, allow 24 hours.

Drain condenser and flush with clean water. Follow acid manu-

facturer’s instructions.

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Refrigerant Charging

WARNING

FILL CONDENSER WITH

CLEANING SOLUTION. DO

NOT ADD SOLUTION

MORE RAPIDLY THAN

VENT CAN EXHAUST

GASES CAUSED BY

PAIL

To prevent personal injury, wear safety glasses and gloves

when handling refrigerant. Do not overcharge system —

this can cause compressor flooding.

FUNNEL

CHEMICAL ACTION.

1”

PIPE

NOTE: Do not vent or depressurize unit refrigerant to atmo-

sphere. Remove and recover refrigerant following accepted

practices.

VENT

PIPE

5’ APPROX

3’ TO 4’

Air Coil Fan Motor Removal

CAUTION

CONDENSER

Before attempting to remove fan motors or motor mounts,

place a piece of plywood over evaporator coils to prevent

coil damage.

Disconnect motor power wires from motor terminals before

motor is removed from unit.

1. Shut off unit main power supply.

PAIL

Fig. 35 — Gravity Flow Method

2. Loosen bolts on mounting bracket so that fan belt can be

removed.

3. Loosen and remove the 2 motor mounting bracket bolts

on left side of bracket.

Slide motor/bracket assembly to extreme right and lift out

through space between fan scroll and side frame. Rest motor on

a high platform such as a step ladder. Do not allow motor to

hang by its power wires.

GAS VENT

PUMP

PRIMING

CONN.

GLOBE

VALVES

SUCTION

SUPPLY

PUMP

SUPPORT

1” PIPE

CONDENSER

Replacing the WSHP Open Controller’s Bat-

tery — The WSHP Open controller’s 10-year lithium

CR2032 battery provides a minimum of 10,000 hours of data

retention during power outages.

TANK

REMOVE WATER

REGULATING VALVE

RETURN

NOTE: Power must be ON to the WSHP Open controller

when replacing the battery, or the date, time and trend data will

be lost.

1. Remove the battery from the controller, making note of

the battery's polarity.

FINE MESH

SCREEN

Fig. 36 — Forced Circulation Method

Checking System Charge — Units are shipped with

full operating charge. If recharging is necessary:

2. Insert the new battery, matching the battery's polarity

with the polarity indicated on the WSHP Open controller.

1. Insert thermometer bulb in insulating rubber sleeve on

liquid line near filter drier. Use a digital thermometer for

all temperature measurements. DO NOT use a mercury

or dial-type thermometer.

TROUBLESHOOTING

2. Connect pressure gage to discharge line near compressor.

3. After unit conditions have stabilized, read head pressure

on discharge line gage.

When troubleshooting problems with a WSHP, consider the

following:

Thermistor — A thermistor may be required for single-

phase units where starting the unit is a problem due to low

voltage. See Fig. 37 for thermistor nominal resistance.

NOTE: Operate unit a minimum of 15 minutes before

checking charge.

4. From standard field-supplied Pressure-Temperature chart

for R-410A refrigerant, find equivalent saturated con-

densing temperature.

5. Read liquid line temperature on thermometer; then

subtract from saturated condensing temperature. The dif-

ference equals subcooling temperature.

Control Sensors — The control system employs 2 nom-

inal 10,000 ohm thermistors (FP1 and FP2) that are used for

freeze protection. Be sure FP1 is located in the discharge fluid

and FP2 is located in the air discharge. See Fig. 38.

6. Compare the subcooling temperature with the normal

temperature listed in Tables 20-23. If the measured liquid

line temperature does not agree with the required liquid

line temperature, ADD refrigerant to raise the tempera-

ture or REMOVE refrigerant (using standard practices) to

lower the temperature (allow a tolerance of ± 3° F).

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important for the most efficient operation of the unit and for the

life of the compressor.

Packaged heat pumps typically use one bi-flow TXV to me-

ter refrigerant in both modes of operation. When diagnosing

possible TXV problems it may be helpful to reverse the refrig-

erant flow to assist with the diagnosis.

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.0

Geothermal and water source heat pumps are designed to

operate through a wide range of entering-water temperatures

that will have a direct effect on the unit refrigerant oper-

ating pressures. Therefore, diagnosing TXV problems can be

difficult.

TXV FAILURE — The most common failure mode of a TXV

is when the valve fails while closed. Typically, a TXV uses

spring pressure to close the valve and an opposing pressure,

usually from a diaphragm, to open the valve. The amount of

pressure exerted by the diaphragm will vary, depending on the

pressure inside of the sensing bulb. As the temperature of and

pressure within the bulb decreases, the valve will modulate

closed and restrict the refrigerant flow through the valve. The

result is less refrigerant in the evaporator and an increase in the

superheat. As the temperature at the bulb increases the dia-

phragm pressure will increase, which opens the valve and

allows more refrigerant flow and a reduction in the superheat.

0.0

20.0

40.0

60.0

80.0 100.0 120.0 140.0

Temperature (degF)

Fig. 37 — Thermistor Nominal Resistance

WSHP Open Controller — With the WSHP Open con-

troller option, the 100 most recent alarms can be viewed using

the BACview alarm status and alarm history.

To view the alarms:

If the sensing bulb, connecting capillary, or diaphragm

assembly are damaged, pressure is lost and the spring will force

the valve to a closed position. Often, the TXV will not close

completely so some refrigerant flow will remain, even if inade-

quate flow for the heat pump to operate.

1. Navigate to the Alarm Status screen from the Home

screen using the arrow softkeys. The screen will display

the current alarm status, either normal or Alarm, and al-

low for scrolling through the unit’s alarm status.

2. From the Alarm Status screen, press the Alarm softkey to

view the 100 most recent alarms which are labeled with

date and time for easy reference.

The TXV sensing bulb must be properly located, secured,

and insulated as it will attempt to control the temperature of the

line to which it is connected. The sensing bulb must be located

on a dedicated suction line close to the compressor. On a pack-

aged heat pump, the bulb may be located almost any place on

the tube running from the compressor suction inlet to the

reversing valve. If the bulb is located on a horizontal section, it

should be placed in the 10:00 or 2:00 position for optimal

performance.

NOTE: Active faults can be viewed by scrolling down,

these faults indicate a possible bad sensor or some condi-

tion which may not merit an alarm.

3. To view alarms which have been corrected, scroll down

through the Alarm screen to Return Top Normal screen.

NOTE: Alarms are automatically reset once alarm con-

dition has been corrected.

See Table 32 for possible alarm cause and solution.

CAUTION

Use caution when tightening the strap. The strap must be

tight enough to hold the bulb securely but caution must be

taken not to over-tighten the strap, which could dent, bend,

collapse or otherwise damage the bulb.

Thermostatic Expansion Valves — Thermostat-

ic expansion valves (TXV) are used as a means of metering the

refrigerant through the evaporator to achieve a preset superheat

at the TXV sensing bulb. Correct superheat of the refrigerant is

AIR

COIL

SUCTION

AIRFLOW

(°F)

AIRFLOW

(°F)

COMPRESSOR

THERMISTOR

EXPANSION

VALVE

COAX

DISCHARGE

FP2

FP1

CONDENSATE

OVERFLOW

(CO)

LIQUID

LINE

WATER IN

WATER OUT

AIR COIL

WATER

COIL

PROTECTION

FREEZE

PROTECTION

LEGEND

COAX

—

Coaxial Heat Exchanger

Airflow

Refrigerant Liquid Line Flow

Fig. 38 — FP1 and FP2 Thermistor Location

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The bulb must be secured to the pipe using a copper strap.

The use of heat transfer paste between the bulb and the pipe

will also help ensure optimum performance.

Diagnostics—Several tests may be required to determine if

a TXV has failed. The following tools may be required for

testing:

The bulb must also be properly insulated to eliminate any

influence on valve operation by the surrounding conditions.

Cork tape is the recommended insulation as it can be molded

tight to the bulb to prevent air infiltration.

1. Refrigerant gage manifold compatible with the refriger-

ant in the system

2. Digital thermometer, preferably insulated, with wire leads

that can be connected directly to the tubing

Causes of TXV Failure — The most common causes of TXV

failure are:

3. Refrigerant pressure-temperature chart for the refrigerant

used

1. A cracked, broken, or damaged sensing bulb or capillary

can be caused by excessive vibration of the capillary dur-

ing shipping or unit operation.

To determine that a TXV has failed, verify the following:

• The suction pressure is low and the valve is non-responsive.

The TXV sensing bulb can be removed from the suction

line and warmed by holding the bulb in your hand. This

action should result in an increase in the suction pressure

while the compressor is operating. The sensing bulb can

also be chilled by immersion in ice water, which should

result in a decrease in the suction pressure while the

compressor is operating. No change in the suction pres-

sure would indicate a nonresponsive valve.

If the sensing bulb is damaged or if the capillary is

cracked or broken, the valve will be considered failed and

must be replaced. Replacement of the TXV “power head”

or sensing bulb, capillary, diaphragm assembly is possi-

ble on some TXVs. The power head assembly screws

onto most valves, but not all are intended to be replace-

able. If the assembly is not replaceable, replace the entire

valve.

• Simultaneous LOW suction pressure, HIGH refrigerant

2. Particulate debris within the system can be caused by sev-

eral sources including contaminated components, tubing,

and service tools, or improper techniques used during

brazing operations and component replacement.

subcooling and HIGH superheat.

• LOW suction pressure, LOW subcooling and HIGH super-

heat may indicate an undercharge of refrigerant. HIGH sub-

cooling and LOW superheat may indicate an overcharge of

refrigerant. The suction pressure will usually be normal or

high if there is an overcharge of refrigerant.

• LOW suction pressure and frosting of the valve and/or

equalizer line may indicate a failed valve. However, these

symptoms may also indicate an undercharge of refrigerant.

Calculate the subcooling and superheat to verify a failed

valve or refrigerant charge issue.

Problems associated with particulate debris can be com-

pounded by refrigerant systems that use POE (polyol es-

ter oil). POE oil has solvent-like properties that will clean

the interior surfaces of tubing and components. Particu-

lates can be released from interior surfaces and may mi-

grate to the TXV strainer, which can lead to plugging of

the strainer.

3. Corrosive debris within the system may happen after a

failure, such as a compressor burn out, if system was not

properly cleaned.

Repair

WARNING

4. Noncondensables may be present in the system. Non-

condensables includes any substance other than the

refrigerant or oil such as air, nitrogen, or water. Contami-

nation can be the result of improper service techniques,

use of contaminated components, and/or improper evacu-

ation of the system.

Symptoms — The symptoms of a failed TXV can be varied

and will include one or more of the following:

• Low refrigerant suction pressure

Puron refrigerant (R-410A) operates at higher pressure

than R-22, which is found in other WSHPs. Tools such as

manifold gages must be rated to withstand the higher pres-

sures. Failure to use approved tools may result in a failure

of tools, which can lead to severe damage to the unit, injury

or death.

WARNING

• High refrigerant superheat

• High refrigerant subcooling

Most TXVs are designed for a fixed superheat setting and

are therefore considered non-adjustable. Removal of the

bottom cap will not provide access for adjustment and can

lead to damage to the valve or equipment, unintended vent-

ing of refrigerant, personal injury, or possibly death.

• TXV and/or low pressure tubing frosting

• Equalizer line condensing and at a lower temperature than

the suction line or the equalizer line frosting

• FP1 faults in the heating mode in combination with any of

the symptoms listed above

• FP2 faults in the cooling mode in combination with any of

the symptoms listed above. Some symptoms can mimic a

failed TXV but may actually be caused be another problem.

CAUTION

Always recover the refrigerant from the system with suit-

able approved tools, recovery equipment, and practices

prior to attempting to remove or repair any TXV.

Before conducting an analysis for a failed TXV the follow-

ing must be verified:

• Confirm that there is proper water flow and water tempera-

ture in the heating mode.

CAUTION

• Confirm that there is proper airflow and temperature in the

Use caution when tightening the strap. The strap must be

tight enough to hold the bulb securely but caution must be

taken not to over-tighten the strap, which could dent, bend,

collapse or otherwise damage the bulb.

cooling mode.

• Ensure coaxial water coil is clean on the inside; this applies

to the heating mode and may require a scale check.

• Refrigerant may be undercharged. To verify, subcooling and

superheat calculations may be required.

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IMPORTANT: Repair of any sealed refrigerant system

requires training in the use of refrigeration tools and proce-

dures. Repair should only be attempted by a qualified ser-

vice technician. A universal refrigerant handling certificate

will be required. Local and/or state license or certificate

may also be required.

CAUTION

Puron refrigerant (R-410A) requires the use of synthetic

lubricant (POE oil). Do not use common tools on systems

that contain R-22 refrigerants or mineral oil. Contamina-

tion and failure of this equipment may result.

See Tables 30-32 for additional troubleshooting

information.

IMPORTANT: Due to the hygroscopic nature of the

POE oil in Puron refrigerant (R-410A) and other envi-

ronmentally sound refrigerants, any component replace-

ment must be conducted in a timely manner using

caution and proper service procedure for these types of

refrigerants. A complete installation instruction will be

included with each replacement TXV/filter drier assem-

bly. It is of critical importance these instructions are

carefully understood and followed. Failure to follow

these instructions can result in a system that is contami-

nated with moisture to the extent that several filter drier

replacements may be required to properly dry the

system.

CAUTION

Disconnect power from unit before removing or replacing

connectors, or servicing motor. Wait 5 minutes after dis-

connecting power before opening motor.

Table 30 — ECM Troubleshooting

FAULT

DESCRIPTION

SOLUTION

Motor rocks slightly when

starting

Motor will not start

This is normal start-up for ECM.

Check power at motor.

No movement

Check low voltage (24-vac R to C) at motor.

Check low voltage connections (G,Y, W, R, C) at motor.

Check for unseated pins in connectors on motor harness. See Fig. 39.

Test with a temporary jumper between R and G.

Check motor for tight shaft.

Perform motor/control replacement check.

Run moisture check. See Moisture Check section in Troubleshooting.

Check for loose or non-compliant motor mount.

Make sure blower wheel is tight on shaft.

Motor rocks

Perform motor/control replacement check.

Motor oscillates up and down

while being tested off of blower

It is normal for motor to oscillate with no load on shaft.

Motor starts, but runs erratically Varies up and down or intermittent Check line voltage for variation or “sag.”

Check low voltage connections (G,Y, W, R, C) at motor, unseated pins in motor harness

connectors. See Fig. 39.

Check “Bk” for erratic cfm command (in variable speed applications).

Check system controls, thermostat.

Perform moisture check. See Moisture Check section in Troubleshooting.

If removing panel or filter reduces “puffing,” reduce restriction or reduce maximum airflow.

“Hunts” or “puffs” at high cfm

(speed)

Stays at low cfm despite system

call for cool or heat cfm

Check low voltage (thermostat) wires and connections.

Verify fan is not in delay mode. Wait until delay is complete.

Check to see if “R” is missing/not connected at motor.

Perform motor/control replacement check.

Stays at high cfm

Check to see if “R” is missing/not connected at motor.

Verify fan is not in delay mode. Wait until delay is complete.

Perform motor/control replacement check.

Blower will not shut off

Noisy blower or cabinet

Check to see if there is current leakage from controls into G, Y, or W. Check for Triac switched

thermostat or solid state relay.

Excessive noise

Determine if it’s air, cabinet, duct, or motor noise.

Check for loose blower housing, panels, etc.

If high static is creating high blower speed, check for air whistling through seams in ducts,

cabinets, or panels.

If high static is creating high blower speed, check for cabinet/duct deformaton.

“Hunts” or “puffs” at high cfm

(speed)

If removing panel or filter reduces “puffing,” reduce restriction or reduce maximum airflow.

Evidence of moisture

Motor failure or malfunction has

occurred and moisture is present

Replace motor and perform moisture check. See Moisture Check section in Troubleshooting.

Perform moisture check. See Moisture Check section in Troubleshooting.

Evidence of moisture present

inside air mover

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a50-8448

Fig. 39 — ECM Pin Connectors

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Stopped or Malfunctioned ECM Motor — Refer

to Fig. 40 to determine the possible cause of a stopped or mal-

functioned ECM motor. Follow the instructions in the boxes.

a50-8447

Fig. 40 — ECM Troubleshooting Flow Diagram

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• Check if condensate drain is plugged.

• Check for low airflow (too much latent capacity).

• Check for undercharged condition.

Moisture Check — To perform moisture check:

• Check that connectors are orientated “down” (or as recom-

mended by equipment manufacturer).

• Arrange harnesses with “drip loop” under motor.

• Check and plug leaks in return ducts, cabinet.

Table 31 — Good Practices

DO NOT

Check motor, controls wiring, and connections thoroughly before replac- Automatically assume the motor is bad.

ing motor.

Orient connectors down so water cannot get in. Install “drip loops.”

Locate connectors above 7 and 4 o’clock positions.

Use authorized motor and control model numbers for replacement.

Replace one motor or control model number with another (unless

replacement is authorized).

Keep static pressure to a minimum by:

Use high pressure drop filters.

Use restricted returns.

•

Using high efficiency, low-static filters.

Keeping filters clean.

Designing ductwork for minimum static and maximum comfort.

Improving ductwork when replacement is necessary.

Size equipment wisely.

Oversize system then compensate with low airflow.

Check orientation before inserting motor connectors.

Plug in power connector backwards.

Force plugs.

Table 32 — WSHP Troubleshooting

FAULT

Main Power Problems

HEATING COOLING

POSSIBLE CAUSE

Green Status LED Off

SOLUTION

Check line voltage circuit breaker and disconnect.

Check for line voltage between L1 and L2 on the contactor.

Check for 24 vac between R and C on controller.

Check primary/secondary voltage on transformer.

Check pump operation or valve operation/setting.

Check water flow adjust to proper flow rate.

HP Fault — Code 2

High Pressure

Reduced or no water flow in cooling

Water temperature out of range in

cooling

Bring water temperature within design parameters.

Reduced or no airflow in heating

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

Dirty air coil — construction dust etc.

External static too high. Check blower performance per Tables 9-13.

Air temperature out of range in heating Bring return-air temperature within design parameters.

Overcharged with refrigerant

Check superheat/subcooling vs typical operating condition per

Tables 20-23.

Bad HP switch

Insufficient charge

Compressor pump down at start-up

Check switch continuity and operation. Replace.

Check for refrigerant leaks.

Check charge and start-up water flow.

LP/LOC Fault — Code 3

Low Pressure/Loss of

Charge

FP1 Fault — Code 4

Water Freeze Protection

Reduced or no water flow in heating Check pump operation or water valve operation/setting.

Plugged strainer or filter. Clean or replace.

Check water flow adjust to proper flow rate.

Inadequate antifreeze level

Improper freeze protect setting (30F Clip JW2 jumper for antifreeze (10F) use.

vs 10F)

Check antifreeze density with hydrometer.

Water temperature out of range

Bad thermistor

Reduced or no airflow in cooling

Bring water temperature within design parameters.

Check temperature and impedance correlation.

Check for dirty air filter and clean or replace.

FP2 Fault — Code 5

Air Coil Freeze Protection

Check fan motor operation and airflow restrictions.

External static too high. Check blower performance per Tables 9-13.

Air temperature out of range

Too much cold vent air. Bring entering air temperature within design

parameters.

Improper freeze protect setting (30F Normal airside applications will require 30 F only.

vs 10F)

Bad thermistor

Blocked drain

Improper trap

Poor drainage

Check temperature and impedance correlation.

Check for blockage and clean drain.

Check trap dimensions and location ahead of vent.

Check for piping slope away from unit.

Check slope of unit toward outlet.

Condensate Fault —

Code 6

Poor venting. Check vent location.

Moisture on sensor

Check for moisture shorting to air coil.

LEGEND

LED — Light-Emitting Diode

— Reversing Valve

TXV — Thermostatic Expansion Valve

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Table 32 — WSHP Troubleshooting (cont)

FAULT

Over/Under Voltage —

Code 7 (Auto Resetting)

HEATING COOLING

POSSIBLE CAUSE

Under voltage

SOLUTION

Check power supply and 24 vac voltage before and during operation.

Check power supply wire size.

Check compressor starting.

Check 24 vac and unit transformer tap for correct power supply voltage.

Check power supply voltage and 24 vac before and during operation.

Check 24 vac and unit transformer tap for correct power supply voltage.

Check for poor airflow or overcharged unit.

Over voltage

Performance Monitor —

Code 8

Heating mode FP2>125F

Cooling mode FP1>125F OR

FP2<40F

Check for poor water flow or airflow.

FP1 and FP2 Thermistors

— Code 9

FP1 temperature is higher

than FP2 temperature.

Swap FP1 and FP2 thermistors.

FP2 temperature is higher

than FP1 temperature.

No Fault Code Shown

No compressor operation

Compressor overload

Control board

See Scroll Compressor Rotation section.

Check and replace if necessary.

Reset power and check operation.

Reverse position of thermistors.

Swapped Thermistor —

Code 9

FP1 and FP2 swapped

Unit Short Cycles

Dirty air filter

Check and clean air filter.

Unit in 'Test Mode'

Unit selection

Reset power or wait 20 minutes for auto exit.

Unit may be oversized for space. Check sizing for actual load of space.

Check and replace if necessary.

Compressor overload

Thermostat position

Unit locked out

Only Fan Runs

Ensure thermostat set for heating or cooling operation.

Check for lockout codes. Reset power.

Compressor overload

Thermostat wiring

Check compressor overload. Replace if necessary.

Check Y and W wiring at heat pump. Jumper Y and R for compressor

operation in Test mode.

Only Compressor Runs

Thermostat wiring

Check G wiring at heat pump. Jumper G and R for fan operation.

Check Y and W wiring at heat pump. Jumper Y and R for compressor

operation in test mode.

Fan motor relay

Jumper G and R for fan operation. Check for line voltage across BR

contacts.

Check fan power enable relay operation (if present).

Check for line voltage at motor. Check capacitor.

Fan motor

Unit Does Not Operate in

Cooling

Reversing valve

Set for cooling demand and check 24 vac on RV coil and at control.

If RV is stuck, run high pressure up by reducing water flow and while

operating, engage and disengage RV coil voltage to push valve.

Thermostat setup

Thermostat wiring

Dirty filter

Check for 'O' RV setup not 'B'.

Check O wiring at heat pump. Jumper O and R for RV coil 'Click'.

Replace or clean.

Insufficient Capacity/

Not Cooling or Heating

Properly

Reduced or no airflow in heating Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower performance per Tables 9-13.

Reduced or no airflow in cooling Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower performance per Tables 9-13.

Leaky ductwork

Check supply and return air temperatures at the unit and at distant duct

registers if significantly different, duct leaks are present.

Low refrigerant charge

Restricted metering device

Defective reversing valve

Check superheat and subcooling per Tables 20-23.

Check superheat and subcooling per Tables 20-23. Replace.

Set for cooling demand and check 24 vac on RV coil and at control.

If RV is stuck, run high pressure up by reducing water flow and while

operating, engage and disengage RV coil voltage to push valve.

Thermostat improperly located

Unit undersized

Check location and for air drafts behind thermostat.

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Scaling in water heat exchanger Perform condenser cleaning.

Inlet water too hot or cold Check load, loop sizing, loop backfill, ground moisture.

LEGEND

LED — Light-Emitting Diode

— Reversing Valve

TXV — Thermostatic Expansion Valve

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Table 32 — WSHP Troubleshooting (cont)

FAULT

HEATING COOLING

POSSIBLE CAUSE

SOLUTION

High Head Pressure

Reduced or no airflow in heating Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower performance per Tables 9-13.

Check pump operation or valve operation/setting.

Reduced or no water flow in

cooling

Check water flow adjust to proper flow rate. See Tables 19 and 24.

Check load, loop sizing, loop backfill, ground moisture.

Bring return-air temperature within design parameters.

Inlet water too hot

Air temperature out of range in

heating

Scaling in water heat exchanger Perform condenser cleaning.

Unit overcharged

Check superheat and subcooling. Reweigh in charge.

Noncondensables in system

Restricted metering device

Reduced water flow in heating

Remove refrigerant, evacuate system and charge unit.

Check superheat and subcooling per Tables 20-23. Replace.

Check pump operation or water valve operation/setting.

Plugged strainer or filter. Clean or replace.

Low Suction Pressure

Check water flow adjust to proper flow rate.

Water temperature out of range

Reduced airflow in cooling

Bring water temperature within design parameters.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower performance per Tables 9-13.

Air temperature out of range

Too much cold vent air. Bring entering air temperature within design

parameters.

Insufficient charge

Too high airflow

Poor performance

Too high airflow

Unit oversized

Check for refrigerant leaks.

Check blower performance per Tables 9-13.

See “Insufficient Capacity.”

Low Discharge Air

Temperature in Heating

High Humidity

Check blower performance per Tables 9-13

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Low Refrigerant Suction

Pressure

Normal operation

Check/compare with unit Installation Manual for typical operating temper-

atures and pressures chart.

Reduced water flow

Check pump operation.

Check strainer or filter.

Improper flow regulator.

Water temperature out of range

Bring water temperature within proper range.

Conduct water quality analysis.

Scaling in water to refrigerant

heat exchanger

Reduced airflow

Check for dirty air filter.

Check for dirty air coil.

Check fan motor operation.

External static pressure exceeds fan operating parameters.

Space temperature too cold.

Return air temperature below

minimum

Excessive fresh air.

Supply air bypassing to return air Check for leaking ductwork.

stream (zone systems).

Insufficient refrigerant charge

Locate and repair leak.

Improperly located TXV sensing Locate bulb on suction line between reversing valve and compressor.

bulb

Failed or restricted metering

device

Failed TXV power head, capillary or sensing bulb.

Plugged TXV strainer.

High Refrigerant Superheat

Insufficient refrigerant charge

Locate and repair leak.

Improperly located TXV sensing Locate bulb on suction line between reversing valve and compressor.

bulb

Failed or restricted metering

device

Failed TXV power head, capillary or sensing bulb.

Plugged TXV strainer.

High Refrigerant

Subcooling

Excessive refrigerant charge

Remove refrigerant as needed.

Failed or restricted metering

device

Failed TXV power head, capillary or sensing bulb.

Plugged TXV strainer.

TXV and/or Low Pressure

Tubing Frosting

Normal operation

May occur when entering water temperature is close to minimum.

Locate and repair leak.

Insufficient refrigerant charge

Failed or restricted metering

device

Failed TXV power head, capillary or sensing bulb.

Plugged TXV strainer.

Equalizer Line Condensing

or Frosting

Failed or restricted metering

device

Failed TXV power head, capillary or sensing bulb.

Plugged TXV strainer.

LEGEND

LED — Light-Emitting Diode

— Reversing Valve

TXV — Thermostatic Expansion Valve

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APPENDIX A — WSHP OPEN SCREEN CONFIGURATION

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

EDITABLE

RANGE

DEFAULT

NOTES

Off, Fan Only, Economize,

Cooling, Heating, Cont Fan,

Test, Start Delay, Dehumidify

Operating Mode

Displays unit operating mode



SPT

SAT

Displays SPT

Displays SAT

Condenser Leaving

Temperature

Displays leaving condenser

water temperature



Displays entering condenser

water temperature (Value

will not update when compressor

is operating)

Condenser Entering

Temperature



Off/Low Speed/

Medium Speed

High Speed/On

Fan

Displays fan speed status

Equipment

Status

No Password

Required

Compressor Capacity

Damper Position

0 - 100%

Displays compressor capacity

Displays current damper position

(Viewable only if Ventilation DMP

Type = 2 position or DCV)

H O Economizer

Displays position of economizer valve

Displays position of auxiliary

reheat valve (Viewable only if Leaving

Air Auxiliary Heat Type = 2 position,

1 stage Elect or Modulating)

Auxiliary Heat

0 - 100%

Displays space RH% (Viewable only if

Humidity Sensor = Installed)

Space RH

0 - 100%

Displays if dehumidification is active

(Viewable only if Factory

Dehumidification Reheat = Installed)

Dehumidification

Inactive/Active

IAQ CO

0 - 9999 ppm

Normal/Alarm

Displays the space CO level

Displays current space

temperature condition

SPT Alarm Status

Displays the SPT that

exceeded the alarm limit (when SPT

alarm above is in Alarm)



Alarming SPT

Displays the SPT alarm limit that was

exceeded; causing the alarm condition

(when SPT alarm above is in Alarm)

SPT Alarm Limit

Displays the status of the Rnet

SPT sensor - ALARM is displayed

should the sensor fail to communicate

with the control module

SPT Sensor Alarm

Status

Normal/Alarm

IAQ Alarm Status

Normal/Alarm

Current IAQ/ventilation condition

Current compressor condition

Current SAT condition

Compressor Alarm

Status

No Password

Required

Alarm Status

SAT Alarm Status

Condensate Overflow

Alarm Status

Current status of the condensate

drain (overflow switch)

Condenser Water Tem-

perature Alarm Status

Current status of the

condenser water

Normal/Alarm

Filter Alarm Status

Normal/Alarm

Current filter condition

Space RH Alarm Status

Current space RH condition

Current status of the OAT

broadcast function

OAT Alarm Status

Normal/Alarm

Airside Linkage Status

Current linkage status if enabled

Condenser Water

Linkage

Current linkage status if enabled



SAT

Display SAT



SAT Offset

-9.9 - 10.0

Used to correct sensor reading

Leaving Condenser

Water Temperature

Displays Leaving Condenser

Water Temperature



Leaving CW Offset

-9.9 - 10.0

Used to correct sensor reading

Sensor

Calibration

Admin Password

level access only

Rnet Sensor

Temperature



Displays SPT



Rnet Offset

-9.9 - 10.0

Used to correct sensor reading

Displays Space RH value

RH Sensor Offset

-15% - 15%

0 %

Used to correct sensor reading

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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APPENDIX A — WSHP OPEN SCREEN CONFIGURATION (cont)

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

EDITABLE

RANGE

DEFAULT

NOTES

Off, Fan Only,Economize,

Cooling, Heating, Cont Fan, Test,

Start Delay, Dehumidify

Operating Mode

Displays unit operating mode

Displays how the fan is configured

to operate

Fan Operating Mode

Occupancy Status

Auto/Continuous/Always On

Unoccupied/Occupied

Displays the current occupancy status

Always Occupied/Local Schedule/

BACnet Schedule/BAS Keypad/

Occupied Contact/Holiday Schedule/

Override Schedule/Pushbutton

Override/Unoccupied None

Displays the origin of the

occupancy control

Occupancy Control

Outside Air

Displays OAT (Viewable only if OAT

is a network broadcast)



Temperature

SPT

Displays SPT

Normal/Above Limit/Below

Limit/Sensor Failure

SPT Status

Displays the SPT status

Displays the connection status

of the Rnet sensor

SPT Sensor Status

Condensate Overflow

Cooling Set Point

Inactive/Connected

Normal/Alarm

Displays the status of the

condensate overflow

Displays the actual set point

being used for cooling control



Displays the actual set point

being used for heating control

Heating Set Point

Unit

Maintenance

No Password

required

Displays the offset values from the Rnet

user set point adjustment that is being

applied to the configured set points



Set Point Adjustment

Auxiliary Heat Control

Set Point

Displays the calculated set point being

used for auxiliary heating control



H O Economizer

Control Set Point

Displays the calculated set point being

used for economizer control

Calculated IAQ/

Ventilation Damper

position

Displays the ventilation damper

position calculated by the DCV control

Active Compressor

Stages

Displays the actual number of

compressor stages operating

0/1/2



SAT

Displays SAT

Used to reset the filter alarm timer after

the filter has been cleaned or replaced

Reset Filter Alarm

No/Yes

Displays the state of the condensate

overflow switch contact

Overflow Contact

Closed/Open

Displays the state of the external/

remote occupancy input switch contact

Occupancy Contact

Provides capability to force the

equipment to operate in an

occupied or unoccupied mode

Inactive/Occupied/

Unoccupied

BAS/Keypad Override

OAT Input

Inactive

Displays if an OAT value is being

received from the Network

N/A / Network

BACnet

Keypad Configuration

Password

See TPI

Mapping

Changes password

See TPI

System Settings

Network

BACnet Time Master

Clock Set

See TPI

Changes clock/time setting

Override Schedules

Pushbutton Override

Inactive/Active Occupied

Inactive/Active Occupied/Active

Unoccupied

Keypad Override

Occupancy

Maintenance

No Password

required

Used to display the active and

inactive occupancy control inputs

Schedules

Occupancy Contact

BAS on/off

Inactive/Active Occupied

Local Occupancy

Schedules

Disable/Enable

Enable

Disable

Local Holiday

Schedules

User/Admin

Password level

access

Used to define which occupancy inputs

are used to determine

Schedule

Configuration

Local Override

Schedules

occupancy mode.

BACnet Occupancy

Schedules

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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APPENDIX A — WSHP OPEN SCREEN CONFIGURATION (cont)

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

Occupied Heating

Occupied Cooling

Unoccupied Heating

Unoccupied Cooling

EDITABLE

RANGE

DEFAULT

NOTES

Defines the Occupied

Heating Set Point



40 - 90

55 - 99

40 - 90

55 - 99

Defines the Occupied

Cooling Set Point

Defines the Unoccupied

Heating Set Point

Defines the Unoccupied

Cooling Set Point

Effective Heating

Set Point

Takes into effect bias (maximum

allowable set point deviation)



0 - 10

Effective Cooling

Set Point

Takes into effect bias (maximum

allowable set point deviation)



Uses historical data to calculate

ramp up time so as to be at set point

at occupied/unoccupied time

Optimal Start

Configuration

Set Points

Defines the control set point used

during occupied periods (Viewable

only if Humidity Sensor = Installed/

Determines when to start

User/Admin

Password level

access

Occupied RH

Set Point

0 - 100%

65%

Dehumidification when occupied)

Defines the control set point used

during unoccupied periods

(Viewable only if Humidity Sensor =

Installed/Determines when to start

Dehumidification when unoccupied)

Unoccupied RH

Set Point

0 - 100%

90%

Defines the control set point used to

start increasing ventilation during

occupied periods (Viewable only if

Ventilation DMP Type = DCV)

DCV CTRL Start

Set Point

0 - 9999 ppm

500 ppm

Defines the control set point

used to define where the ventilation

will reach its maximum limit during

DCV Max CTRL

Set Point

0 - 9999 ppm

1050 ppm occupied periods (Viewable only if

Ventilation DMP Type = DCV/Used

to determine DCV ending control

point)

Defines the start time for an

Start Time

End Time

Mon

00:00 - 23:59

00:00 - 24:00

No/Yes

06:00

occupied period

Defines the ending time of an

18:00

occupied period

Determines if this day is included

Yes

Configuration

Schedule

in this schedule

Determines if this day is included

Tue

No/Yes

Yes

in this schedule

User/Admin

Password level

access

Determines if this day is included

Wed

No/Yes

Yes

in this schedule

Determines if this day is included

Thur

No/Yes

Yes

in this schedule

Determines if this day is included

Weekly Schedule

Fri

No/Yes

Yes

in this schedule

Determines if this day is included

Sat

No/Yes

in this schedule

Determines if this day is included

Sun

No/Yes

in this schedule

Defines the start month of this

Start Month

Start Day

Start Time

End Month

End Day

End Time

0 - 12

hoilday schedule

Configuration

Schedule

Defines the start day of this holiday

0 - 31

schedule

Determines the start time for this

00:00 - 23:59

0 - 12

0:00

User/Admin

Password level

access

schedule

Defines the month to end this

hoilday schedule

Defines the day to end this holiday

0 - 31

Exception

Schedules 1 - 12

schedule

Determines the time to end this

00:00 - 24:00

0:00

schedule

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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APPENDIX A — WSHP SCREEN OPEN CONFIGURATION (cont)

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

EDITABLE

RANGE

DEFAULT

NOTES

Auto= Intermittant operation during both

occupied and unoccupied periods/

Continuous = Intermittant during unoccupied

periods and continuous during occupied

periods/Always on = fan operates

continuously during both occupied and

unoccupied periods

Auto/Continuous/

Always On

Fan Mode

Continuous

Defines the delay time before the fan begins

to operate after heating or cooling is started

Fan On Delay

Fan Off Delay

0 - 30 sec

10 sec

45 sec

Defines the amount of time the fan will

continue to operate after heating or

cooling is stopped

0 - 180 sec

Provides capability to manually

disable heating operation

Heating Enable

Cooling Enable

Disable/Enable

Enable

Provides capability to manually

disable cooling operation

Minimum SAT in

Cooling

Defines the minimum acceptable operating

temperature for the Supply Air



40 - 60

Configuration

Maximum SAT in

Heating

Defines the maximum acceptable operating

temperature for the Supply Air



80 - 140

110

Admin Password

level access only

Normally set to 100% if 2 position damper

type or set to minimum ventilation position if

damper type = DCV

Damper Ventilation

Position

0 - 100%

100%

Unit

Configuration

DCV Maximum Vent

Position

Usually set at 100% - Used to limit maximum

damper opening in DCV mode

0 - 100%

100%

Filter Alarm Timer

0 - 9999 hrs

0 hrs

Disables Filter Alarm if set to 0

Pushbutton Override

Disable/Enable

Enable

Enables Override Feature on Rnet sensor

SPT Sensor Set Point

Adjustment

Enables Set Point adjustment capability

on Rnet Sensor

Disable/Enable

Enable

Cooling is locked out when OAT is less than

configured value and OAT is actively being

broadcast

Lockout Cooling if

OAT <



-65 - 80

35 - 150

-65

Heating is locked out when OAT is greater

than configured value and OAT is actively

being broadcast

Lockout Heating if

OAT >



150

Power Fail Restart

Delay

0 - 600 sec

60 sec

Enable

Delay before equipment starts

Occupancy Schedules

Disable/Enable

Enables unit occupied

Used to enforce minimum

set point separation



Set Point Separation

2 - 9

Used to enable test mode. Will automatically

reset to disable after 1 hour

Test Mode

Fan Test

Disable/Enable

Disable

Used to test all fan speeds. Sequences fan

from low to high and operates each speed for

1 minute. Resets to disable on completion

Off/Low Speed/Medium

Speed/High Speed/On

Fan Speed

Displays current fan operation

Used to test compressor cooling and heating

operation. Sequences cooling stage 1, then

stage 2, then heating stage 2 and reduces

capacity to stage 1. Operates for 1 minute per

step. Resets to disable on completion.

Compressor Test

Disable/Enable

Disable

Used to test dehumification mode -

Operates for 2 minutes. Resets to

disable on completion.

Configuration

Service

Dehumidification Test

Testing Compressor

Disable/Enable

Inactive/Heating/Cooling/

Dehumidify/TimeGard

Wait

Admin Password

level access only

Displays compressor test mode

Used to test auxiliary heat.

Sequences fan on and enables

heating coil for 1 minute. Resets to

disable on completion

Aux Heating Test

Disable/Enable

Disable

Test

Used to test entering/return air water loop

economizer coil operation. Sequences fan on

and opens economizer coil water valve for 1

minute. Resets to disable on completion

H O Economizer Test

Preposition OA

Damper

Used to preposition OA damper

actuator to set proper preload

Disable/Enable

Disable

Open Vent

Damper 100%

Used to test OA damper operation

Displays SAT



SAT

Displays Leaving Condenser

Water Temperature

LCWT

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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APPENDIX A — WSHP SCREEN OPEN CONFIGURATION (cont)

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

EDITABLE

RANGE

DEFAULT

NOTES

Used to set number of

fan motor speeds

# of Fan Speeds

1,2,3

When set to Fan On, G output is

energized when ever any fan speed

is active (required for ECM and Fan

control board). When set to Fan

Low, output is only energized for

Low Speed

G Output Type

Fan On/Fan Low

Fan On

Defines the number of

stages of compression

Compressor Stages

Reversing Valve Type

One Stage/Two Stages

One Stage

O type

None

Determines reversing valve

signal output type

O type output/B type output

Leaving Air Auxiliary

Heat Type

None/2-Position HW/1 Stage

Electric/Modulating HW

Determines Auxiliary

Reheat Coil Type

Entering Air Water

Economizer Type

Determines Entering Air

Economizer Coil Type

None/2-Position/Modulating

Normally Closed/Normally Open

None/2-Position/DCV

None

2-Position Water

Valve Type

Normally

Closed

Determines type of 2-position

water valve used

Modulating Water

Valve Type

Normally

Closed

Determines type of modulating

water valve used

Ventilation Damper

Type

Determines type of ventilation

damper control to be used

None

0-10 volt

None

Used to determine ventilation

damper output signal range

(closed - open)

Damper Actuator Type

Humidity Sensor

(0-10 volt)/(2-10 volt)

None/Installed

Set to Installed if humidity

sensor is present

Configuration

Admin Password

level access only

Set to Installed if factory-installed

dehumidification reheat coil

is present

Factory Dehumidifica-

tion Reheat Coil

None/Installed

None

Service

Configuration

Occupancy

Input Logic

Occupied

Used to determine external occu-

Occupied Open/Occupied Closed

5 - 600 seconds

CLOSED pancy switch contact occupied state

Condensate Switch

Alarm Delay

Delay before equipment alarms on

10 sec

high condensate level

Condensate Switch

Alarm State

Alarm

CLOSED

Determine Alarm state of

condensate switch input

Alarm OPEN/Alarm CLOSED

Minimum Condenser

Water Temperature in

Heating

Determines the minimum

acceptable water loop temperature

to start heating



25 - 60

Maximum Condenser

Water Temperature in

Heating

Determines the maximum

acceptable water loop temperature

to start heating



65 - 100

Minimum Condenser

Water Temperature in

Cooling

Determines the minimum

acceptable water loop temperature

to start cooling



30 - 60

Maximum Condenser

Water Temperature in

Cooling

Determines the maximum

acceptable water loop temperature

to start cooling

85 - 120

IAQ sensor

Minimum output current (mA)

for IAQ sensor

0 - 5 ma

4 ma

20 ma

minimum input

IAQ sensor

maximum input

Maximum output current (mA) for

IAQ sensor

5 - 20 ma

IAQ sensor

minimum output

Corresponding value in ppm for

minimum output current

0 - 9999 ppm

0 ppm

IAQ sensor

maximum output

Corresponding value in ppm for

maximum output current

2000 ppm

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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APPENDIX A — WSHP SCREEN OPEN CONFIGURATION (cont)

PASSWORD

LEVEL

SCREEN NAME

POINT NAME

EDITABLE

RANGE

DEFAULT

NOTES

Defines the hysteresis applied above

the cooling and below the heating set

points before an alarm condition will

occur

SPT Occupied Alarm

Hysteresis



2 - 20

Used to calculate the delay time before

an alarm is generated after the alarm

condition occurs

SPT Alarm Delay

0 - 30 min per degree

10 min

SPT Unoccupied Low

Alarm Temperature

Defines the fixed unoccupied

ow SPT alarm limit



35 - 90

SPT Unoccupied High

Alarm Temperature

Defines the fixed unoccupied

high SPT alarm limit



45 - 100

SAT Low SAT

Alarm Limit

Defines the fixed minimum

SAT alarm limit



15 - 90

SAT High SAT

Alarm Limit

Defines the fixed maximum

SAT alarm limit



90 - 175

120

Defines the delay time before an alarm

is generated after the alarm condition

occurs

Condensate Overflow

Alarm Delay

5 - 600 sec

45% - 100%

10 sec

100%

5 min

Space Humidity Occupied

High Alarm Limit

Defines the fixed occupied

high space RH alarm limit

Used to calculate the delay time before

an alarm is generated after the alarm

condition occurs

Space Humidity Alarm

Delay

0 - 30 min per % RH

Configuration

Space Humidity Unoccu- Admin Password

Defines the fixed unnoccupied

high space RH alarm limit

45% - 100%

0 - 9999 ppm

100%

pied High Alarm Limit

level access only

Alarm

Configuration

IAQ/Ventilation Occupied

High Alarm Limit

Defines the fixed occupied high

space IAQ/Ventilation alarm limit

1100 ppm

Used to calculate the delay time before

0.25 min an alarm is generated after the alarm

condition occurs

IAQ/Ventilation

Alarm Delay

0.1 - 1.0 min per ppm

Determines if the SPT alarm is

Ignore

Rnet Sensor SPT Alarm

Rnet Sensor SAT Alarm

Ignore/Display

displayed on the local Rnet sensor

Determines if the SAT alarm is

Ignore

displayed on the local Rnet sensor

Determines if the Compressor Lockout

Rnet Sensor Compressor

Lockout Alarm

Ignore/Display

Display

alarm is displayed on the local Rnet

sensor

Determines if the Condenser Water

Temperature alarm is displayed on the

local Rnet sensor

Rnet Sensor Condenser

Water Temperature Alarm

Determines if the Condensate

Overflow alarm is displayed on the

local Rnet sensor

Rnet Sensor Condensate

Overflow Alarm

Ignore/Display

Display

Ignore

Rnet Sensor Dirty

Filter Alarm

Determines if the Dirty Filter alarm is

displayed on the local Rnet sensor

Determines if the High Space

RH alarm is displayed on the

local Rnet sensor

Rnet Sensor Space

High Humidity Alarm

Loop Control Network

Number

See TPI

Configuration

Linkage

Loop Control Network

Address

Number of Linked Heat

Pumps

LEGEND

BAS — Building Automation System

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

OAT — Outdoor Air Temperature

— Relative Humidity

SAT — Supply Air Temperature

SPT — Space Temperature

TPI — Third Party Integration

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500079-01

Printed in U.S.A.

Form 50PT-4SI

Pg 62

7-10

Replaces: 50PT-3SI

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50PTH,PTV,PTD

START-UP CHECKLIST

CUSTOMER:___________________________

MODEL NO.:___________________________

JOB NAME: _______________________________________

SERIAL NO.:____________________

DATE:_________

I. PRE-START-UP

DOES THE UNIT VOLTAGE CORRESPOND WITH THE SUPPLY VOLTAGE AVAILABLE? (Y/N)

HAVE THE POWER AND CONTROL WIRING CONNECTIONS BEEN MADE AND TERMINALS

TIGHT? (Y/N)

HAVE WATER CONNECTIONS BEEN MADE AND IS FLUID AVAILABLE AT HEAT EXCHANGER?

(Y/N)

HAS PUMP BEEN TURNED ON AND ARE ISOLATION VALVES OPEN? (Y/N)

HAS CONDENSATE CONNECTION BEEN MADE AND IS A TRAP INSTALLED? (Y/N)

IS AN AIR FILTER INSTALLED? (Y/N)

II. START-UP

IS FAN OPERATING WHEN COMPRESSOR OPERATES? (Y/N)

IF 3-PHASE SCROLL COMPRESSOR IS PRESENT, VERIFY PROPER ROTATION PER INSTRUCTIONS.

(Y/N)

UNIT VOLTAGE — COOLING OPERATION

PHASE AB VOLTS

PHASE BC VOLTS

(if 3 phase)

PHASE CA VOLTS

(if 3 phase)

PHASE AB AMPS

PHASE BC AMPS

(if 3 phase)

PHASE CA AMPS

(if 3 phase)

CONTROL VOLTAGE

IS CONTROL VOLTAGE ABOVE 21.6 VOLTS? (Y/N)

IF NOT, CHECK FOR PROPER TRANSFORMER CONNECTION.

TEMPERATURES

FILL IN THE ANALYSIS CHART ATTACHED.

COAXIAL HEAT COOLING CYCLE:

EXCHANGER

FLUID IN

FLUID OUT

AIR OUT

PSI

FLOW

HEATING CYCLE:

FLUID IN

AIR COIL

COOLING CYCLE:

AIR IN

HEATING CYCLE:

AIR IN

AIR OUT

CL-1

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HEATING CYCLE ANALYSIS

PSI

°F

SAT

AIR

COIL

SUCTION

°F

COMPRESSOR

DISCHARGE

EXPANSION

COAX

VALVE

°F

a50-8449

LIQUID LINE

°F

PSI

°F

PSI

FLUID IN

FLUID OUT

LOOK UP PRESSURE DROP IN TABLES 20-23

TO DETERMINE FLOW RATE

COOLING CYCLE ANALYSIS

PSI

°F

SAT

AIR

COIL

SUCTION

°F

COMPRESSOR

DISCHARGE

EXPANSION

COAX

VALVE

°F

a50-8450

LIQUID LINE

°F

PSI

FLUID OUT

FLUID IN

LOOK UP PRESSURE DROP IN TABLES 20-23

TO DETERMINE FLOW RATE

HEAT OF EXTRACTION (ABSORPTION) OR HEAT OF REJECTION =

FLOW RATE (GPM) x TEMP. DIFF. (DEG. F) x

FLUID FACTOR* =

(Btu/hr)

SUPERHEAT = SUCTION TEMPERATURE – SUCTION SATURATION TEMPERATURE

(DEG F)

SUBCOOLING = DISCHARGE SATURATION TEMPERATURE – LIQUID LINE TEMPERATURE

(DEG F)

*Use 500 for water, 485 for antifreeze.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500079-01

Printed in U.S.A.

Form 50PT-4SI

Pg CL-2

7-10

Replaces: 50PT-3SI

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