Carrier Heat Pump 50RTG User Manual

Rooftop Water Source Heat Pump Units

50RTG

Installation, Start-Up, and

Service Instructions

Page

CONTENTS

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Units with Aquazone™ Complete C Control . . . . . 19

Units with Aquazone Deluxe D Control . . . . . . . . . . 19

SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19,20

Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Aquazone Deluxe D Control LED Indicators . . . . . 20

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-22

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Water Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 21

Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 21

Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 22

Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 22

Page

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

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

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

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

• STORAGE

• PROTECTION

• INSPECT UNIT

Step 3 — Location of Unit . . . . . . . . . . . . . . . . . . . . . . . . 3

Step 4 — Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . 6

Step 5 — Condensate Drain . . . . . . . . . . . . . . . . . . . . . . 6

Step 6 — Piping Connections . . . . . . . . . . . . . . . . . . . . 6

• WATER LOOP APPLICATIONS

• GROUND-WATER APPLICATIONS

• GROUND-LOOP APPLICATIONS

Step 7 — Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . 7

• SUPPLY VOLTAGE

• 208-VOLT OPERATION

• BLOWER SELECTION

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 22-25

Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Step 8 — Low Voltage Wiring. . . . . . . . . . . . . . . . . . . . 14

• THERMOSTAT CONNECTIONS

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2

• WATER FREEZE PROTECTION

• AIR COIL FREEZE PROTECTION

• ACCESSORY CONNECTIONS

• WATER SOLENOID VALVES

IMPORTANT: Read the entire instruction manual before

starting installation.

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15

System Checkout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SAFETY CONSIDERATIONS

FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .15,16

C Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

C Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

D Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Accessory Relay Configurations . . . . . 16

Water Valve (Slow Opening) . . . . . . . . . . . . . . . . . . . 16

Outside Air Damper (OAD) . . . . . . . . . . . . . . . . . . . . 16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-18

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 17

Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 18

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 18

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should

install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions of cleaning coils and filters and replacing filters. All other

operations should be performed by trained service personnel.

When working on air-conditioning equipment, observe precau-

tions in the literature, tags and labels attached to the unit, and

other safety precautions that may apply.

Improper installation, adjustment, alteration, service, main-

tenance, or use can cause explosion, fire, electrical shock or

other conditions which may cause personal injury or property

damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The

qualified installer or agency must use factory-authorized kits or

accessories when modifying this product. Refer to the individ-

ual instructions packaged with the kits or accessories when

installing.

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

PC 111 Catalog No. 535-004 Printed in U.S.A. Form 50R-2SI Pg 1 8-02 Replaces: New

Book 1

Tab 5a 5a

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

plete the procedures listed below:

7. Remove any blower support cardboard from inlet of the

blower if present.

1. Compare the electrical data on the unit nameplate with

ordering and shipping information to verify that the

correct unit has been shipped.

2. Verify that the unit is the correct model for the entering

water temperature of the job.

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

installation.

4. Verify that the refrigerant tubing is free of kinks or dents,

and that it does not touch other unit components.

5. Inspect all electrical connections. Be sure connections are

clean and tight at the terminals.

6. Compressors are internally spring-mounted. Compressors

equipped with external spring vibration isolators must

have bolts loosened and shipping clamps removed.

8. Locate and verify any accessory kit located in compressor

section.

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

remove once unit is installed.

Step 3 — Location of Unit — The following guide-

lines should be considered when choosing a location for

WSHP. Refer to Fig. 1 and 2 for unit dimensional data:

• Provide sufficient space for water, electrical and duct

connections

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

removal of filter and access panels

• Allow enough space for service personnel to perform

maintenance

Table 1 — Physical Data — Aquazone™ 50RTG03-20 Units

UNIT 50RTG

OPERATING WEIGHT (lb)

SHIPPING WEIGHT (lb)

735

750

785

800

835

850

880

900

1080

1100

1125

1150

1175

1200

1770

1800

1960

2000

REFRIGERANT TO AIR HEAT EXCHANGER

Face Area (sq ft)

7.5

9.3

10.5

Rows Deep

Copper Tube Size (in.)

No. Fins per Inch

REFRIGERANT CHARGE R-22/Ckt (oz)

NUMBER OF CIRCUITS

132

141

160

BLOWER DATA

Diameter (qty-in.)

Width (in.)

1-10

1-12

1-15

2-15

FILTER DATA

Size (in.)

Quantity

16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20

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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 gpm per ton

of cooling capacity. For proper maintenance and servicing,

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

and flow verification.

Step 4 — Mounting the Unit — For proper opera-

tion, units must be mounted on a roof curb as shown in Fig. 3.

Follow these guidelines when installing the roof curb:

1. Set unit on curb.

2. Align unit so that its return and supply air direction match

the return and supply air opening in the roof curb frame.

3. Run both the return and supply loop piping, as well as the

electrical supply line, through the pipe chase provided in

the curb.

In addition to complying with any applicable codes, consid-

er the following for system piping:

Step 5 — Condensate Drain

• Piping systems utilizing water temperatures below

1. Install a condensate trap at each unit with the top of

the trap positioned below the unit condensate drain

connection.

50 F require /₂-in. closed cell insulation on all piping

surfaces to eliminate condensation.

• All plastic to metal threaded fittings should be avoided

due to the potential 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.

• The piping system should be flushed prior to operation to

remove dirt and foreign materials from the system.

2. Design the length of the trap (water seal) based on the

amount of positive or negative pressure on the drain pan.

As a rule, 1 in. of trap is required for each inch of nega-

tive pressure on the unit.

Note that condensate is allowed to drain onto the roof.

Step 6 — Piping 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.

GROUND-WATER APPLICATIONS — In addition to com-

plying with any applicable codes, consider the following for

system piping:

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:

• Install shut-off valves for servicing.

• Install pressure-temperature plugs to measure flow and

temperature.

• Boiler drains and other valves should be connected using

a “T” connector 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.

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

pressure and temperature extremes.

• Use a backup wrench when making screw connections to

unit to prevent internal damage to piping.

• Insulation may be required on piping to avoid condensa-

tion in the case where fluid in loop piping operates at

temperatures below dew point of adjacent air.

• 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 Supply and Quantity — Check water supply. Water

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

water quality guidelines.

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 that is not the responsi-

bility of the manufacturer.

50 RTG

UNIT

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

ton is recommended. In addition to complying with any appli-

cable codes, consider the following for system piping:

• Piping materials should be limited to only polyethylene

fusion in the buried sections of the loop.

• Galvanized or steel fittings should not be used at any

time due to corrosion.

FLASHING

GASKET

ROOF

• All plastic to metal threaded fittings should be avoided

due to the potential to leak. Use a flange fitted substitute.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Pressure-temperature (P/T) plugs should be used to mea-

sure flow of pressure drop.

CURB

Fig. 3 — 50RTG Curb Installation

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AB = 452 volts

BC = 464 volts

AC = 455 volts

Step 7 — Electrical Wiring

452 + 464 + 455

Average Voltage =

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.

1371

457

Use only copper conductors for field-installed electrical

wiring. Unit terminals are not designed to accept other

types of conductors.

Determine maximum deviation from average voltage:

(AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v

Maximum deviation is 7 v.

Determine percent voltage imbalance.

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

conform to the Class II temperature limitations described in the

NEC.

Refer to unit wiring diagram Fig. 4 for a schematic of the

field connections which must be made by the installing (or

electrical) contractor.

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.

Operating voltage must be the same voltage and phase as

shown in Electrical Data shown in Table 3.

Make all final electrical connections with a length of flexi-

ble conduit to minimize vibration and sound transmission to

the building.

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:

% Voltage Imbalance = 100 x

457

= 1.53%

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

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 (as illustrated on the wiring diagram) by

switching the red (208 volt) wire with the orange (230 volt)

wire at the L1 terminal.

BLOWER SELECTION — All water source heat pumps are

factory set with the appropriate motor and sheave combination

to achieve the desired airflow performance. Performance is

selected by matching the desired performance with the appro-

priate region in Tables 4-12. Per the table notes, regions desig-

nated by A, B, C and D represent motor drive options.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

NOTE: Factory-installed sheaves are field adjustable. Refer to

Tables 4-12 for adjustment points.

Example: Supply voltage is 460-3-60.

Table 2 — Water Quality Guidelines

CONDITION

Total Hardness Calcium and magnesium carbonate should not exceed 20 grains per gallon (350 ppm).

ACCEPTABLE LEVEL

7 to 9 range for copper. Cupro-nickel may be used in the 5 to 9 range.

Iron Oxides

Iron Bacteria

Corrosion*

Less than 1 ppm.

No level allowable.

Max Allowable Level

0.5 ppm

Coaxial Metal

Ammonia, Ammonium Hydroxide

Ammonium Chloride, Ammonium Nitrate

Ammonium Sulfate

Chlorine/Chlorides

Hydrogen Sulfide†

0.5 ppm

CuNi

—

0.5 ppm

None Allowable

Brackish

Use Cupro-nickel heat exchanger when concentrations of calcium or sodium chloride are greater

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

*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 sys-

tem problems, even when both values are within ranges shown. The term pH refers to the acidity, basicity, or neutrality

of the water supply. Below 7.0, the water is considered to be acidic. Above 7.0, water is considered to be basic. Neutral

water contains a pH of 7.0.

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

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50RTG03-07 WITH ECONOMIZER AND COMPLETE C CONTROLLER

WHT

GRN

BLK

Ground

115V / 1PH

Field

Wiring

BLK

Power Supply

Refer to Data Plate

Use copper conductors only.

BLK

GFI

(Optional)

Compressor

Disconnect

Power

Distribution

Block

BLK

(Optional)

BLK

Blower Motor

Logic Module

(Damper Actuator)

MAS

GRY

BRN

150 Ohm

GRY

BLU

600 Ohm

TR1

BRN

LAR

GRY

VIO

RED

(208V)

YEL

BLK

SEE

BRN

YEL

VIO or

NOTE 7

BLK/RED

SEE

NOTE 7

(460V)

BLU

BLK

BRN

GRY

YEL

OAT

BRN

BRG

CCG

SEE

NOTE 3

WHT

TAN

BLU

LAR

24V

ORG

230V

ECR

Test Pins

BRN

YEL

Compressor

Relay

RED

BLU

BRN

GRY

VIO

LOC

FP1

SEE

NOTE 4

LOC

FP1

Compressor

Cooling

Dip Switch

FP1

FP2

Not Used

RVS

Off On

Fan

FP2

BRN

ORG

VIO

24 VAC

Common

Alarm

BRN

ECR

Status

LED

ORG

JW1

Not Used

AL1

AL2

CO 12

Typical T-stat

SEE NOTE 5

SEE NOTE 6

Microprocessor

Control Logic

Alarm

Relay

24V

EH1

EH2

NOTES:

1. Compressor and blower motor thermally protected

internally.

LEGEND

2. All wiring to the unit must comply with NEC and

local codes.

—

Alarm Relay Contacts

Blower Mtr Contactor

Circuit Breaker

Compressor Contactor

Economizer Relay

Auxiliary Heat Stage 1

Auxiliary Heat Stage 2

Enthalpy Sensor

RVS

—

Performance Monitor

3. 208/230

transformers will be connected for

Field Wiring Terminal Block

Reversing Valve Solenoid

208 v operations. For 230 v operations, discon-

nect Red lead at L1, and attach Orange lead to

L1. Close open end of Red Lead with insulating

tape.

ECR

EH1

EH2

FP1

FP2

JW1

LAR

LOC

MAS

NEC

OAT

Relay Contactor Coil

Solenoid Coil

4. FP1 jumper provides freeze protection for

WATER. When using ANTI-FREEZE solutions, cut

FP1 jumper.

5. Typical thermostat wiring shown. Refer to thermo-

stat Installation Instructions for wiring to the unit.

6. 24 v alarm signal shown. For dry alarm contact,

cut JW1 jumper and dry contact will be available

between AL1 and AL2.

7. Transformer secondary ground via Complete C

board standoffs and screws to control box.

(Ground available from top two standoffs as

shown.)

Sensor, Water Coil Freeze Protection

Sensor, Air Coil Freeze Protection

High Pressure Switch

Thermistor

Ground

Jumper, Alarm Mode

Low Ambient Relay

Loss-of-Charge Pressure Switch

Mixed Air Sensor

Field Line Voltage Wiring

Field Low Voltage Wiring

Printed Circuit Trace

National Electrical Code

Outside Air Thermostat

Fig. 4 — Typical Aquazone™ Complete C Control Wiring

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Table 3 — 50RTG Electrical Data

POWER

SUPPLY

COMPRESSOR

(each)

BLOWER

MOTOR

FLA

MAX. FUSE

OR HACR

BREAKER

MINIMUM

CIRCUIT

AMPACITY

UNIT

50RTG

Voltage

RLA

LRA

QTY

208/230

460

208/230

460

575

10.7

5.0

13.9

6.4

5.3

63.0

31.0

88.0

44.0

34.0

3.6

1.8

3.6

1.8

1.6

25 Amp

15 Amp

30 Amp

15 Amp

17.0

8.1

21.0

9.8

8.2

208/230

460

20.0

7.5

123.0

49.5

40.0

156.0

70.0

54.0

88.0

44.0

34.0

123.0

49.5

40.0

123.0

62.0

50.0

156.0

70.0

54.0

232.0

116.0

97.0

3.6

1.8

1.6

6.2

3.1

2.3

6.2

3.1

2.3

6.2

3.1

2.3

9.2

4.3

3.4

9.2

4.3

3.4

13.2

6.6

5.6

45 Amp

15 Amp

50 Amp

25 Amp

20 Amp

50 Amp

20 Amp

15 Amp

70 Amp

25 Amp

20 Amp

70 Amp

35 Amp

25 Amp

70 Amp

35 Amp

30 Amp

125 Amp

60 Amp

45 Amp

28.6

11.2

9.6

32.1

15.6

12.6

37.5

17.5

14.2

51.2

20.0

16.7

52.6

26.8

21.0

55.8

26.8

21.9

88.1

44.9

34.4

575

6.4

208/230

460

575

208/230

460

575

208/230

460

575

208/230

460

575

208/230

460

575

208/230

460

575

20.7

10.0

8.2

13.9

6.4

5.3

20.0

7.5

6.4

19.3

10.0

7.8

20.7

10.0

8.2

33.3

17.0

12.8

LEGEND

Full Load Amps

FLA

—

HACR — Heating, Air Conditioning and Refrigeration

LRA

RLA

—

Lock Rotor Amps

Rated Load Amps

NOTE: Contact factory for oversize blower motor electrical data.

Table 4 — 50RTG03 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

BHP

RPM

0.12

0.14

0.17

667

4.5

0.19

691

4.0

0.23

721

3.5

0.26

752

3.00

0.31

777

2.5

0.35

807

2.5

0.19

724

3.5

0.22

745

3.0

0.21

779

2.5

0.24

798

2.5

0.23

833

1.5

0.26

849

1.5

0.31

870

1.0

0.35

892

1.0

0.40

911

0.5

0.44

935

0.0

0.50

963

2.5

0.26

885

1.0

0.30

898

0.5

0.33

917

0.5

0.37

937

0.0

0.42

954

2.5

0.47

976

2.0

0.53

1003

2.0

0.29

933

0.0

0.32

946

0.0

0.36

963

2.5

0.41

982

2.0

0.45

997

2.0

0.51

1017

1.4

0.56

1041

1.5

0.31

980

2.0

0.35

991

2.0

0.39

1008

2.0

0.44

1025

1.5

0.33

1024

1.5

0.37

1035

1.5

0.42

1051

1.0

0.46

1066

1.0

0.52

1079

1.0

0.57

1096

0.5

0.64

1118

0.5

975

1050

1125

1200

1275

1350

1425

₅₅₀B ₆₀₉

Turns Out

5.0

3.5

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

0.14

580

4.0

0.18

619

3.5

0.22

658

4.5

0.26

688

4.0

0.29

721

3.5

0.4

763

3.0

0.17

636

3.0

0.20

670

4.5

0.24

705

4.00

0.29

732

3.5

0.32

764

3.0

0.40

803

2.5

0.25

0.28

₇₇₂A ₈₂₁

3.0

2.0

0.29

799

2.5

0.33

822

2.0

0.39

850

1.5

0.44

883

1.0

0.32

846

1.5

0.36

867

1.5

0.41

893

1.0

0.46

923

0.5

0.48

C ₁₀₃₈

1.5

0.54

1057

1.0

0.42

843

1.5

0.61

1080

1.0

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. For applications requiring higher static pressures, contact your local representative.

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Table 5 — 50RTG04 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

BHP

RPM

0.26

633

0.30

694

3.5

0.33

755

4.5

0.40

782

4.0

0.48

819

3.5

0.57

851

3.0

0.66

887

2.0

0.76

923

1.5

0.89

961

1.0

0.36

812

3.5

0.43

836

3.0

0.52

871

2.5

0.40

869

2.5

0.46

890

2.0

0.55

922

1.5

0.42

925

1.5

0.50

943

1.0

0.58

970

0.5

0.67

995

0.0

0.78

1024

3.5

0.89

1053

3.0

1.02

1086

2.5

1300

1400

1500

1600

1700

1800

1900

Turns Out

_0.33B_0.36

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

0.53

995

0.5

Operation Not Recommended

668

725

3.0

0.45

766

4.5

0.54

801

3.5

0.62

840

3.0

0.72

878

2.5

0.85

919

1.5

0.418

712

3.0

0.506

750

4.5

0.572

792

4.0

0.671

832

3.0

0.62

1017

3.5

0.65

1063

3.0

_0.61A _0.64

0.70

1040

3.5

0.81

1068

3.0

0.75

1083

1.5

0.86

1110

2.5

0.78

1125

2.0

0.89

1152

1.5

0.83

1166

1.5

0.94

1194

1.0

900

2.0

948

1.0

0.74

979

0.5

0.85

1010

0.0

0.98

1045

3.0

0.70

934

1.5

0.80

967

1.0

0.94

1003

0.0

0.94

1095

2.5

1.07

1127

2.0

0.97

1136

2.0

1.11

1166

1.5

1.01

1176

1.5

1.16

1204

1.0

1.06

1219

1.0

1.20

1242

0.5

0.80

875

2.5

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

Table 6 — 50RTG05 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

BHP

RPM

0.37

797

3.5

0.42

845

2.5

0.48

882

1.5

0.56

923

3.5

0.65

967

3.0

0.74

1005

2.0

0.84

1047

1.5

0.96

1091

4.5

0.45

892

1.5

0.53

927

3.5

0.61

966

3.0

0.69

1007

2.0

0.78

1044

1.5

0.89

1084

1.0

1.00

1126

4.0

0.50

938

3.0

0.56

971

2.5

0.65

1008

2.0

0.54

984

2.5

0.61

1015

2.0

0.69

1049

1.5

0.58

1029

1.5

0.65

1057

1.0

0.74

1090

0.5

0.84

1126

0.5

0.94

1158

0.0

1.05

1193

3.0

1.17

1231

2.5

0.63

1072

1.0

0.70

1099

0.5

0.78

1131

0.5

0.88

1164

0.0

0.98

1195

3.0

1.09

1229

2.5

1.22

1265

2.0

0.67

1114

0.5

0.75

1140

0.5

0.84

1170

0.0

0.94

1203

3.0

Operation Not

Recommended

1700

1800

1900

2000

2100

2200

2300

Turns Out

_0.44B

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

0.79

1180

0.0

836

2.5

0.52

880

1.5

0.61

926

3.5

0.69

966

3.0

0.79

1009

2.0

0.88

1208

3.0

0.98

1240

2.5

0.94

1246

2.5

_0.74A_0.78

1.03

1277

2.0

1047

1.5

1087

1.0

0.88

1120

0.5

0.99

1157

3.5

1.11

1196

3.0

0.84

1082

1.0

0.94

1120

0.5

1.06

1161

3.5

1.03

1.09

1268

2.0

1.14

1303

1.5

¹²³¹D

2.5

1.14

1264

2.0

1.20

1298

1.5

1.25

1333

1.0

0.9

1055

1.0

1.28

1299

1.5

1.33

1332

1.0

1.39

1365

0.5

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

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Table 7 — 50RTG07 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

0.42 0.46 0.51

0.56

750

4.5

0.73

793

3.5

0.88

830

3.0

0.62

792

3.5

0.78

831

3.0

0.95

865

2.0

1.12

901

1.5

1.33

939

0.5

1.56

978

5.0

1.90

1029

4.0

0.67

832

2.5

0.85

869

2.0

1.00

900

1.5

1.19

933

0.5

1.40

970

5.0

1.64

1007

4.5

1.98

1056

3.5

0.73

870

2.0

0.90

905

1.5

1.07

935

0.5

1.25

965

0.0

1.47

1000

4.5

1.72

1035

4.0

2.06

1082

3.0

0.78

908

1.5

0.97

941

0.5

1.14

969

0.0

1.33

997

4.5

1.54

1030

4.0

1.79

1064

3.5

2.13

1109

2.5

1950

2200

2400

2600

2800

3000

3250

620

4.5

664

3.5

707

2.5

Operation Not Recommended

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

0.56 0.62 0.67

1.03

975

5.0

1.21

1002

4.5

1.40

1029

4.0

1.62

1059

3.5

1.87

1091

3.0

2.22

1135

2.5

1.10

1007

3.0

1.17

1038

2.5

675

716

2.0

755

4.5

0.70 0.76 0.83

1.28

1034

4.0

1.34

1066

3.5

1.41

1097

3.0

721

2.0

758

4.5

795

3.5

0.87 0.94 0.99

1.06

868

2.0

1.27

908

1.5

1.47

1060

3.5

1.55

1090

3.0

1.63

1120

2.5

1.69

1149

2.0

1.77

1178

1.5

2.01

1203

1.0

2.28

1228

1.0

2.65

1263

0.5

765

800

3.5

835

3.0

1.07 1.13 1.20

1.69

1089

3.0

1.77

1118

2.5

1.86

1147

2.0

1.94

1175

1.5

812

3.5

845

2.5

877

2.0

1.28 1.35 1.42

1.50

949

0.5

1.83

1001

4.5

1.95

1119

2.5

2.30

1161

2.0

2.02

1147

2.0

2.39

1187

1.5

2.11

1174

1.5

2.20

1202

1.0

857

2.5

889

1.5

919

1.0

_2.48D_2.56

1.60 1.67 1.75

915

1.0

945

0.5

974

5.0

1212

1.0

1238

1.0

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

Table 8 — 50RTG08 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

0.40

482

4.5

0.51

514

0.64

549

2.5

0.81

588

1.00

623

3.5

1.20

657

2.5

1.47

699

1.5

0.45

521

3.5

0.56

550

2.5

0.69

583

4.5

0.88

619

3.5

1.07

652

3.0

1.28

685

2.0

1.56

725

1.0

0.50

559

2.0

0.62

585

4.5

0.76

615

4.0

0.55

594

4.5

0.67

619

3.5

0.83

647

3.0

1.02

679

2.0

1.21

709

1.5

1.43

739

0.5

1.73

775

5.0

0.61

629

3.5

0.74

651

3.0

0.88

677

2.0

1.09

707

1.5

1.29

736

0.5

1.51

764

5.0

1.82

799

4.5

0.66

661

2.5

0.79

683

2.0

0.95

707

1.5

1.16

735

0.5

1.36

763

5.0

1.60

790

4.5

1.89

823

4.0

0.72

693

1.5

0.86

713

1.0

1.01

736

0.5

1.23

763

5.0

1.44

789

4.5

1.67

815

4.0

1.98

847

3.5

0.77

723

1.0

0.91

742

0.5

1.08

764

5.0

1.30

789

4.5

1.52

814

4.0

1.75

839

3.5

2.07

870

3.0

0.83

751

0.0

0.98

770

4.5

1.14

791

4.5

1.38

815

4.0

1.60

839

3.5

1.84

863

3.0

2.16

892

2.5

0.87

779

4.5

1.05

797

4.0

1.22

818

4.0

1.45

841

3.5

1.67

863

3.0

1.91

886

2.5

2.24

915

2.0

0.91

806

4.0

1.10

823

3.5

1.29

843

3.5

0.98

832

3.5

1.16

848

3.0

1.35

868

3.0

1.03

858

3.0

1.21

872

2.5

1.42

894

2.5

1.67

913

2.0

1.90

934

1.5

2.17

954

1.0

1.10

883

2.5

1.27

895

2.0

1.49

915

2.0

1.74

936

1.5

1.99

956

1.0

2.26

976

0.5

2.61

1001

0.0

2400

2650

2900

3200

3450

3700

4000

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

_1.52C_1.60

0.95

649

3.0

865

3.0

890

2.5

1.83

911

2.0

2.08

932

1.5

1.14

681

2.0

1.35

712

1.0

1.64

750

0.0

1.75

887

2.5

2.00

909

2.0

2.33

937

1.5

_2.42D_2.51

958

1.0

980

0.5

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

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Table 9 — 50RTG10 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

0.69

563

4.5

0.76

596

3.5

0.83

628

2.5

1.03

664

1.5

1.28

703

4.5

1.64

750

3.5

1.99

794

4.5

2.52

848

3.5

2.96

889

3.0

0.89

658

1.5

1.10

693

4.5

1.35

730

4.0

0.96

688

1.0

1.18

721

4.0

1.43

756

3.5

1.82

799

2.5

2.18

840

4.0

2.71

891

3.0

1.02

718

4.0

1.24

748

3.5

1.51

782

2.5

1.89

823

2.0

2.27

863

3.5

2.81

912

2.5

1.09

746

3.5

1.32

775

3.0

1.58

807

2.0

1.98

847

4.0

2.35

885

3.0

2.90

933

2.0

1.16

773

3.0

1.39

801

2.5

1.66

832

1.5

2.07

870

3.5

1.22

800

2.5

1.46

827

2.0

1.75

856

1.0

2.16

892

3.0

1.29

826

2.0

1.54

852

1.0

1.83

880

0.5

2.24

915

2.5

1.36

851

1.5

1.62

876

0.5

1.90

903

0.0

2.33

937

2.0

1.43

876

0.5

1.69

900

0.0

1.99

926

2.5

2.42

958

1.5

1.50

900

0.0

1.57

923

2.5

1.85

946

2.0

2.16

971

1.5

2.61

1001

0.5

3000

3300

3600

4000

4300

4700

5000

Turns Out

B_0.96

0.89

604

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Tur ns Out

BHP

RPM

Tur ns Out

BHP

RPM

Tur ns Out

1.77

923

2.5

2.07

949

2.0

635

2.5

1.20

676

1.0

1.56

725

4.0

1.90

770

3.0

2.42

825

4.0

2.86

868

3.5

1.12

647

2.0

1.47

699

4.5

1.82

746

3.5

2.32

803

4.5

1.73

775

3.0

2.09

817

4.5

2.61

869

3.5

2.51

980

1.0

2.93

1012

0.5

_2.73D_2.83

2.45

907

2.5

2.54

929

2.0

2.64

950

1.5

971

1.0

991

1.0

Operation Not Recommended

2.76

847

3.5

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

Table 10 — 50RTG12 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

1.02

609

5.5

1.10 1.18

1.25

695

2.5

1.62

742

5.5

1.33

722

1.5

1.71

767

4.5

2.13

812

3.5

2.63

854

2.5

3.25

908

4.5

3.93

957

3.5

4.70

1007

2.5

1.41

748

5.5

1.78

792

4.0

2.23

835

3.0

2.73

876

1.5

3.36

928

4.0

4.04

976

3.0

4.82

1025

2.0

1.49

774

4.5

1.87

816

3.5

2.32

858

2.0

2.83

897

1.0

3.47

948

3.5

4.16

995

2.5

4.95

1042

1.5

1.56

800

3.5

1.96

839

2.5

2.41

879

1.5

2.93

918

4.5

3.58

968

3.5

4.27

1013

2.0

1.64

825

3.0

2.05

863

2.0

2.51

901

5.0

3.03

938

4.0

3.69

987

3.0

4.39

1031

1.5

1.72

849

2.5

2.13

886

1.5

2.61

923

4.5

3.12

959

3.5

1.80

873

1.5

2.22

908

4.5

2.70

944

4.0

3.23

978

3.0

1.88

896

1.0

1.97

919

4.5

2.40

952

3.5

2.89

985

3.0

3.43

1018

2.0

4.11

1062

1.0

2.05

942

4.0

2.49

973

3.0

2.98

1006

2.5

3.54

1037

1.5

3600

4000

4400

4800

5200

5600

6000

639

4.5

667

3.5

Turns Out

_1.38B_1.45

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

1.54

717

2.0

2.31

930

4.0

2.79

965

3.5

664

4.5

691

3.0

1.77

716

2.0

2.23

765

5.5

2.82

825

4.5

3.47

879

5.5

1.86 1.96

2.05

789

4.0

2.53

833

3.0

741

5.5

765

4.5

2.33 2.43

3.33

998

2.5

4.00

1044

1.5

788

4.0

810

3.5

_3.78D_3.89

2.93 3.04

3.14

888

5.0

3.81

938

4.0

4.58

989

3.0

846

2.5

867

5.5

1006

2.5

1025

2.0

4.62

1067

1.0

3.58 3.70

4.51

1050

1.5

899

5.0

918

4.5

Operation Not

Recommended

4.20

933

4.0

4.33 4.46

952

3.5

970

3.0

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

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Table 11 — 50RTG15 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

0.68

465

5.0

0.87

493

4.0

0.78

506

3.5

0.98

531

3.0

0.88

545

2.5

1.09

568

2.0

1.33

595

4.5

1.62

621

4.0

1.97

654

3.0

2.34

683

2.5

2.77

714

1.5

0.98

582

4.5

1.20

603

4.5

1.45

627

4.0

1.08

617

4.0

1.31

636

3.5

1.57

659

3.0

1.88

682

2.5

2.24

711

1.5

2.64

737

1.0

3.09

766

4.0

1.17

650

3.5

1.42

669

3.0

1.71

690

2.0

2.01

712

1.5

2.39

739

1.0

2.79

764

4.0

3.26

791

3.5

1.28

681

2.5

1.52

701

2.0

1.83

720

1.5

2.15

740

1.0

2.53

766

4.0

2.95

790

3.5

3.41

816

3.0

1.39

711

2.0

1.65

732

1.0

1.94

749

4.5

2.28

768

4.0

2.67

793

3.5

3.10

815

3.0

3.58

840

2.5

1.43

740

1.0

1.76

762

4.0

2.07

777

4.0

2.42

795

3.5

2.83

819

3.0

3.26

840

2.5

3.74

864

2.0

1.54

768

4.0

1.87

791

3.5

1.65

795

3.5

1.94

819

3.0

1.76

821

3.0

2.07

846

2.5

2.44

855

2.0

2.84

871

2.0

3.26

890

1.5

3.73

911

1.0

4.25

933

0.5

Operation Not

Recommended

4500

5000

5500

6000

6500

7000

7500

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

2.16

872

1.5

2.31

897

B_1.22

_2.20C_2.31

1.10

525

3.0

2.51

879

1.5

2.64

902

561

2.0

1.49

589

4.5

1.83

624

4.0

2.19

654

3.0

804

3.0

830

2.5

2.71

846

2.5

3.12

868

2.0

3.56

888

1.5

1.36

556

2.0

1.69

593

4.5

2.05

625

4.0

2.46

660

3.0

1.75

652

3.0

2.10

683

2.5

2.55

821

3.0

2.97

844

2.5

3.41

864

2.0

2.97

895

1.0

3.102

918

0.5

3.41

913

1.0

3.564

936

0.5

2.49

710

2.0

2.94

740

1.0

3.88

934

0.5

_3.91D_4.08

2.62

687

2.5

Operation Not

Recommended

887

1.5

910

1.0

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

Table 12 — 50RTG20 Blower Performance

EXTERNAL STATIC PRESSURE (in. wg)

SCFM

AIRFLOW

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

BHP

RPM

1.38

560

5.5

1.51

592

4.0

1.63

624

3.0

2.10

673

5.0

2.60

711

3.5

3.27

747

2.5

4.06

803

0.5

4.97

850

4.0

5.84

881

3.0

1.76

655

5.5

2.24

702

4.0

2.75

738

3.0

1.89

685

4.5

2.39

729

3.0

2.90

764

2.0

2.02

715

3.5

2.53

757

2.0

3.06

790

1.0

3.77

821

0.0

4.61

872

3.5

5.56

914

2.0

2.16

743

2.5

2.67

783

1.5

3.22

815

0.0

3.95

844

4.0

4.79

894

3.0

5.75

935

1.5

2.30

771

1.5

2.83

809

0.5

3.38

839

4.5

4.13

867

3.5

4.97

916

2.0

5.95

955

1.0

6.89

981

0.0

2.43

797

1.0

2.97

834

4.5

3.54

863

3.5

4.30

890

3.0

5.16

937

1.5

6.15

976

0.5

2.57

823

0.0

3.12

859

3.5

3.70

887

3.0

4.47

912

2.0

2.71

849

4.0

3.28

883

3.0

2.84

874

3.5

3.34

895

2.5

2.99

897

2.5

3.50

919

2.0

4.20

957

1.0

5.01

978

0.5

3.12

921

2.0

3.65

941

1.5

4.27

966

0.5

6,000

6,600

7,200

8,000

8,600

9,300

10,000

Turns Out

_1.83B_1.73

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

BHP

RPM

Turns Out

614

3.5

644

2.0

2.44

684

4.5

3.10

722

3.5

3.88

780

1.5

4.77

828

4.5

5.63

859

3.5

_3.86C_4.03

2.30

656

5.5

2.94

696

4.0

3.71

756

2.0

4.59

805

0.5

910

2.5

933

1.5

4.83

956

1.0

_3.44A_3.61

4.65

935

1.5

5.53

979

0.5

772

1.5

797

1.0

4.42

849

4.0

5.36

893

2.5

6.26

922

2.0

4.25

827

4.5

5.16

872

3.5

6.05

901

2.5

5.35

958

1.0

Operation Not

Recommended

_6.47D_6.68

5.43

838

4.5

942

1.5

962

0.5

LEGEND

BHP

—

Brake Horsepower

SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. Region “D” represents oversized motor and special sheaves.

5. For applications requiring higher static pressures, contact your local representative.

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Step 8 — Low Voltage Wiring

THERMOSTAT CONNECTIONS — The thermostat should

be wired directly to the Aquazone™ control board. See

Fig. 4 and 5.

WATER FREEZE PROTECTION — The Aquazone control

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 13 F when

using antifreeze in colder earth loop applications. See Fig. 6.

AIR COIL FREEZE PROTECTION — The air coil freeze

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

not need adjusting, unless using anti-freeze.

ACCESSORY CONNECTIONS — Terminal labeled A on

the control is provided to control accessory devices such as

water valves, electronic air cleaners, humidifiers, etc. This sig-

nal operates with the compressor terminal. See Fig. 7. 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.

AQUAZONE CONTROL (C Control Shown)

WATER SOLENOID VALVES — Water solenoid valves may

be used on primary secondary pump and ground water installa-

tions. A typical well water control valve wiring which can

limit waste water in a lockout condition is shown in Fig. 7. A

slow closing valve may be required to prevent water hammer.

When using a slow closing valve, special wiring conditions

need to be considered. The valve takes approximately 60 sec-

onds to open (very little water will flow before 45 seconds) and

it activates the compressor only after the valve is completely

opened by closing its end switch. When wired as shown, the

valve will have the following operating characteristics:

Fig. 6 — Typical Aquazone Control Board

Jumper Locations

Terminal Strip P2

Typical

Water

Valve

24 VAC

1. Remain open during a lockout.

Fig. 7 — Typical D Control Accessory Wiring

2. Draw approximately 25 to 35 VA through the “Y” signal

of the thermostat.

PRE-START-UP

IMPORTANT: This can overheat the anticipators of

electromechanical thermostats. Only use relay based

electronic thermostats.

System Checkout — When the installation is complete

and the system is cleaned and flushed, follow the System

Checkout procedure outlined below.

1. Voltage: Ensure that the voltage is within the utilization

range specifications of the unit compressor and fan motor.

2. System Water Temperature: Ensure that the system

water temperature is within an acceptable range to facili-

tate start-up. (When conducting this check, also verify

proper heating and cooling set points.)

3. System Water pH: Verify system water acidity

(pH = 7.5 or 8.5). Proper pH promotes the longevity of

hoses and heat exchangers.

Capacitor

Circ Brkr

Grnd

Contactor-CC

4. System Flushing: Properly clean and flush the system

periodically. Ensure that all supply and return hoses are

connected end-to-end to facilitate system flushing and

prevent fouling of the heat exchanger by system water.

Water used in the system must be potable and should not

contain dirt, piping slag, and chemical cleaning agents.

Transformer

Aquazone “C”

5. Closed-Type Cooling Tower or Open Tower with Heat

Exchanger: Check equipment for proper temperature set

points and operation.

See Note

Low Voltage

Connector

6. Verify Balanced Water Flow Rate to Heat Pump.

THERMOSTAT

WIRED DIRECTLY

TO CONTROL

BOARD

7. Standby Pump: Verify that the standby pump is properly

installed and in operating condition.

8. Access Panels: Assure that all access panels in the filter

and fan section are securely closed.

NOTE: Low voltage connector may be removed for easy installation.

9. Air Dampers: Assure that all air dampers are properly

Fig. 5 — Low Voltage Field Wiring

set.

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10. System Controls: To ensure that no catastrophic system

failures occur, verify that system controls are functioning

and that the sequencing is correct.

11. Freeze Protection for Water System: Verify that freeze

protection is provided for the building loop water system

when outdoor design conditions require it. Inadequate

freeze protection can lead to expensive tower and system

piping repairs.

D Control Jumper Settings

WATER COIL FREEZE PROTECTION (FP1) LIMIT

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

choose FP1 limit of 10 F or 30 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 10 F or 30 F. To select 30 F as the limit, DO NOT

clip the jumper. To select 10 F as the limit (for anti-freeze sys-

tems), clip the jumper.

ALARM RELAY SETTING — Select jumper 4 (JW4-AL2

Dry) for connecting 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.

LOW PRESSURE SETTING — The D Control can be con-

figured 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.

12. System Water Loop: Verify that all air is bled from the

system. Air in the system impedes unit operation and

causes corrosion in the system piping.

13. Unit Filters: To avoid system damage, check that the unit

filter is clean.

14. Unit Fans: Manually rotate fans to assure free rotation.

Ensure that fans are properly secured to the fan shaft. Do

not oil fan motors on start-up since they are lubricated at

the factory.

15. System Control Center: Examine the system control

and alarm panel for proper installation and operation to

ensure control of the temperature set-points for operation

of the system’s heat rejector and boiler (when used).

16. Miscellaneous: Note any questionable aspects of the

D Control DIP Switches — The D Control has 2 DIP

switch blocks. Each DIP switch block has 8 switches and is

labeled either S1 or S2 on the circuit board.

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

the following options for D Control configuration:

Performance Monitor (PM) — Set switch 1 to enable or dis-

able 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 D controls) or in master/slave

applications. In master/slave applications, each compressor 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 ener-

gizing during stage 2 demand.

installation.

17. Air Coil: To obtain maximum performance, the air coil

should be cleaned before starting the unit. A ten percent

solution of dishwasher detergent and water is recom-

mended for both sides of the coil. Rinse thoroughly with

water.

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.

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

cycle during Test mode.

C Control Jumper Settings (See Fig. 4)

WATER COIL FREEZE PROTECTION (FP1) LIMIT

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

choose FP1 limit of 10 F or 30 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 10 F or 30 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) for connecting 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 selec-

tion 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 applications.

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 RV (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 heat pumps with O output. Select OFF for

heat pumps with B output.

C Control DIP Switches — The C Control has 1 DIP

Dehumidification Fan Mode (Not used on 50RTG) — 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.

switch block with two switches. See Fig. 4.

PERFORMANCE MONITOR (PM) — 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.

Switch 6 — Not used.

Boilerless Operation — Switch 7 provides selection of boiler-

less 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.

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

switch is set to OFF, stage 2.

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Boilerless Changeover Temperature — Switch 8 on S1 pro-

vides 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.

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

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

ground C.

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

the NSB and OVR inputs are automatically configured 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 D control

will enter Night Low Limit (NLL) staged heating mode. The

NLL staged heating mode will then provide heating during the

NSB period.

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

used to configure accessory relay options.

Water Valve (Slow Opening) — If relay is config-

ured for Water Valve (slow opening), the relay will start 60 sec-

onds prior to starting compressor relay.

Switches 1 to 3 — These DIP switches provide selection

of Accessory 1 relay options. See Table 13 for DIP switch

combinations.

Switches 4 to 6 — These DIP switches provide selection

of Accessory 2 relay options. See Table 14 for DIP switch

combinations.

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 min-

utes following 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.

Table 13 — DIP Switch Block S2 —

Accessory 1 Relay Options

DIP SWITCH POSITION

ACCESSORY 1

RELAY OPTIONS

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.

Cycle with Fan

Digital NSB

Water Valve — Slow Opening

OAD

Off

LEGEND

NSB — Night Setback

OAD — Outside Air Damper

START-UP

Use the procedure outlined below to initiate proper unit

start-up.

NOTE: All other DIP switch combinations are invalid.

NOTE: This equipment is designed for indoor installation only.

Table 14 — DIP Switch Block S2 —

Accessory 2 Relay Options

Operating Limits

ENVIRONMENT — This equipment is designed for outdoor

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 — All units start and op-

erate with entering air at 40 F, entering water at 20 F and with

both air and water at the flow rates used.

NOTE: These operating limits are not normal or continuous

operating conditions. It is assumed that such a start-up is for

the purpose of bringing the building space up to occupancy

temperature. See Table 15 for operating limits.

DIP SWITCH POSITION

ACCESSORY 2

RELAY OPTIONS

Cycle with Fan

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 (Not used

on 50RTG) — Switch 7 provides selection of auto dehumidifi-

cation 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.

When the disconnect switch is closed, high voltage is

present in some areas of the electrical panel. Exercise

caution when working with the energized equipment.

Switch 8 — Not used.

1. Restore power to system.

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

3. Balance airflow at registers.

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. Room temperature

should be approximately 70 to 75 F dry bulb. Loop water

temperature entering the heat pumps should be between

60 and 110 F.

D Control Accessory Relay Configurations —

The following accessory relay settings are applicable for both

D controls only:

CYCLE WITH FAN — In this configuration, the relay will be

ON any time the Fan Enable relay is on.

CYCLE WITH COMPRESSOR — In this configuration, the

relay will be ON any time the Compressor relay is on.

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

(1) entering air temperature, (2) water temperature and (3)

ambient 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 15.

5. Air temperature drop across the coil should be checked

when compressor is operating. Air temperature drop

should be between 15 and 25 F.

Unit Start-Up Heating Mode

NOTE: Operate the unit in heating cycle after checking the

cooling cycle. Allow five minutes between tests for the pres-

sure or reversing valve to equalize.

1. Turn thermostat to lowest setting and set thermostat

switch to HEAT position.

Table 15 — Operating Limits — 50RTG Units

AIR LIMITS

Rated Ambient Air

Min. Entering Air

COOLING

80° F

HEATING

70° F

50° F

40° F

Rated Entering Air db/wb

Max. Entering Air db/wb

WATER LIMITS

Min. Entering Water

Normal Entering Water

Max. Entering Water

80/67° F

110/83° F

70° F

80° F

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. If temperature is within range, proceed. If tempera-

ture is outside the range, check the heating refrigerant

pressures.

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

ery at the unit grille.

25° F

85° F

115° F

25° F

70° F

115° F

LEGEND

db — Dry Bulb

wb — Wet Bulb

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

ing is acceptable.

6. Air temperature rise across the coil should be checked

when compressor is operating. Air temperature rise

should be between 20 and 30 F after 15 minutes at load.

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

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

7. Check for vibration, noise and water leaks.

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 16. Adjust the water control valve until

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

stantly varies, two pressure gages may be needed in some

applications.

If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

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.

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 an elevated level of 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.

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.

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

will start.

Flushing — Once the piping is complete, final purging and

loop charging is needed. 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:

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. Check the elevation and

cleanliness of the condensate lines; any dripping could be

a sign of a blocked line. Be sure the condensate trap in-

cludes a water seal.

4. Check the temperature of both supply and discharge

water. If temperature is within range, proceed. If tempera-

ture is outside the range, check the cooling refrigerant

pressures.

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

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

pump inlet line to prevent air from filling the line.

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

avoid air entering back into the fluid.

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

cart reservoir will allow 50 psi surges to help purge air

pockets. This maintains the pump at 50 psi.

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

ing pressure is reached.

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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.

NOTE: If air is purged from the system while using a 10 in.

PVC flush tank, only a 1 to 2 in. level drop will be noticed

since liquids are incompressible. If the level drops more than

this, flushing should continue since air is still being com-

pressed in the loop. If level is less than 1 to 2 in., reverse the

flow.

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.

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 leav-

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

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

IMPORTANT: All alcohols should be pre-mixed and

pumped from a reservoir outside of the building or

introduced under water level to prevent fumes.

8. Repeat this procedure until all air is purged.

9. Restore power.

Antifreeze may be added before, during or after the flushing

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 heat-

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

homogenous temperature.

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

Table 17. Use the percentage by volume in Table 18 to deter-

mine the amount of antifreeze to use. Antifreeze concentration

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

ter to measure specific gravity.

FREEZE PROTECTION SELECTION — The 30 F FP1 fac-

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

the unit.

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.

When complete, perform a final flush and pressurize the

loop to a static pressure of 40 to 50 psi for winter months or 15

to 20 psi for summer months.

Table 17 — Approximate Fluid Volume (gal.)

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 16.

per 100 Ft of Pipe

PIPE

DIAMETER (in.)

VOLUME (gal.)

Copper

1.25

1.5

4.1

6.4

9.2

Rubber Hose

Polyethylene

3.9

Table 16 — 50RTG Coaxial Water Pressure Drop

/ IPS SDR11

2.8

4.5

8.0

10.9

18.0

8.3

10.9

17.0

1 IPS SDR11

WATER TEMPERATURE (F)

UNIT

1 / IPS SDR11

GPM

/ IPS SDR11

50RTG

2 IPS SDR11

Pressure Drop (ft. H O)

1 / IPS SCH40

4.0

6.0

3.1

6.1

2.8

5.3

2.8

5.3

2.8

5.3

1 / IPS SCH40

2 IPS SCH40

8.0

9.9

8.9

10.0

14.3

12.9

LEGEND

5.5

8.5

4.2

8.9

3.4

7.8

3.4

7.8

3.4

7.8

IPS — Internal Pipe Size

SCH — Schedule

11.5

14.0

14.8

20.5

13.2

18.6

13.2

18.6

13.2

18.6

SDR — Standard Dimensional Ratio

NOTE: Volume of heat exchanger is approximately 1.0 gallon.

Table 18 — Antifreeze Percentages by Volume

MINIMUM TEMPERATURE FOR

7.0

11.0

15.0

18.0

10.0

15.0

20.0

24.0

11.0

17.0

22.0

27.0

14.0

22.0

30.0

36.0

17.0

25.0

34.0

40.0

21.0

32.0

42.0

51.0

31.0

47.0

62.0

74.0

8.1

16.9

28.5

38.8

3.4

10.1

16.0

22.3

4.5

9.4

14.2

20.0

8.3

17.6

29.4

39.9

4.8

9.4

13.1

22.0

5.3

11.2

18.9

25.6

2.3

6.7

10.7

14.9

3.5

8.1

12.7

18.2

5.5

11.7

19.7

26.7

3.2

6.0

10.3

13.5

2.9

7.4

11.6

16.5

6.4

13.1

20.8

28.0

5.3

11.2

18.9

25.6

2.3

6.7

10.7

14.9

3.5

8.1

12.7

18.2

5.5

11.7

19.7

26.7

3.2

6.0

10.3

13.5

2.9

7.4

11.6

16.5

6.4

13.1

20.8

28.0

5.3

11.2

18.9

25.6

2.3

6.7

10.7

14.9

3.5

8.1

12.7

18.2

5.5

11.7

19.7

26.7

3.2

6.0

10.3

13.5

2.9

7.4

11.6

16.5

6.4

13.1

20.8

28.0

FREEZE PROTECTION (F)

ANTIFREEZE

Methanol (%)

100% USP Food Grade

Propylene Glycol (%)

Cooling Tower/Boiler Systems — These systems

typically use a common loop maintained at 60 to 90 F. The use

of a closed circuit evaporative cooling tower with a secondary

heat exchanger between the tower and the water loop is recom-

mended. 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. Air separation should be located in the

piping system prior to the fluid re-entering the loop field.

5.2

10.7

17.4

24.3

10.6

21.2

34.2

46.2

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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.

Output 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.

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.

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.

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

the G input is not active during Emergency Heat mode.

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.

NOTE: On all subsequent compressor calls the random start

delay is omitted.

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.

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 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 com-

pressor 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.

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.

Units with Aquazone Deluxe D Control

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.

SYSTEM TEST

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

and Fan 2 outputs.

System testing provides the ability to check the control

operation. The control enters a 20-minute Test mode by mo-

mentarily shorting the test pins. All time delays are increased

15 times. See Fig. 4.

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.

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

Enable and Compressor relays 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.

Test Mode — To enter Test mode on C or D controls, cycle

the power 3 times within 60 seconds. The LED (light-emitting

diode) will flash a code representing the last fault when enter-

ing the Test mode. The alarm relay will also power on and off

during Test mode. See Tables 19 and 20. To exit Test mode,

short the terminals for 3 seconds or cycle the power 3 times

within 60 seconds.

NOTE: Deluxe D Control has a flashing code and alarm relay

cycling code that will both have the same numerical label.

For example, flashing code 1 will have an alarm relay cycling

code 1. Code 1 indicates the control has not faulted since the

last power off to power on sequence.

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Table 19 — C Control Current LED Status

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.

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

Off

Slow Flash

Fast Flash

C Control is non-functional

Fault Retry

Open

Aquazone™ Deluxe D Control LED Indica-

tors — There are 3 LED indicators on the D Control:

STATUS LED — Status LED indicates the current status or

mode of the D control. The Status LED light is green.

Lockout

Closed

Open

(Closed after

15 minutes)

Slow Flash

Over/Under Voltage Shutdown

Flashing Code 1 Test Mode — No fault in memory

Flashing Code 2 Test Mode — HP Fault in memory

Flashing Code 3 Test Mode — LP Fault in memory

Flashing Code 4 Test Mode — FP1 Fault in memory

Flashing Code 5 Test Mode — FP2 Fault in memory

Flashing Code 6 Test Mode — CO Fault in memory

Cycling Code 1

Cycling Code 2

Cycling Code 3

Cycling Code 4

Cycling Code 5

Cycling Code 6

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 on

and appear as 1 fast flash alternating with a 10-second pause.

See Table 21.

Test Mode — Over/Under

shutdown in memory

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 — Test Mode — FP1/

FP2 Swapped Fault in memory

SERVICE

Perform the procedures outlined below periodically, as

indicated.

LEGEND

—

Condensate Overflow

Freeze Protection

High Pressure

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.

LED — Light-Emitting Diode

—

Low Pressure

Performance Monitor

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.

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.

Table 20 — C Control LED Code and

Fault Descriptions

IMPORTANT: To avoid the release of refrigerant into the

atmosphere, the refrigerant circuit of this unit must only be

serviced by technicians which meet local, state and federal

proficiency requirements.

LED

CODE

FAULT

DESCRIPTION

No fault in memory

There has been no fault since

the last power-down to power-up

sequence

High-Pressure Switch

Low-Pressure Switch

HP Open Instantly

IMPORTANT: To prevent injury or death due to electrical

shock or contact with moving parts, open unit disconnect

switch before servicing unit.

LP open for 30 continuous sec-

onds before or during a call

(bypassed for first 60 seconds)

Freeze Protection Coax

— FP1

FP1 below Temp limit for 30 con-

tinuous seconds (bypassed for

first 60 seconds of operation)

Filters — Filters must be clean for maximum performance.

Inspect filters every month under normal operating conditions.

replace when necessary.

Freeze Protection Air Coil

— FP2

FP2 below Temp limit for 30 con-

tinuous seconds (bypassed for

first 60 seconds of operation)

Condensate overflow

Over/Under Voltage

Sense overflow (grounded) for

30 continuous seconds

IMPORTANT: Units should never be operated with-

out a filter.

"R" power supply is <19VAC or

>30VAC

(Autoreset) Shutdown

PM Warning

Performance Monitor Warning

has occurred.

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. The heat

exchanger should be kept 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 PSI during

the summer and 40 PSI during the winter.

FP1 and FP2 Thermistors FP1 temperature is higher than

are Swapped

FP2 in heating/test mode, or FP2

temperature is higher than FP1

in cooling/test mode.

LEGEND

—

Freeze Protection

High Pressure

LED — Light-Emitting Diode

—

Low Pressure

Performance Monitor

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

Check P trap frequently for proper operation.

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Table 21 — Aquazone 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

D Control is non-functional

Test Mode

Off

—

Off

—

Off

Open

Flash Last Fault Code in Memory

Flashing Code 1

Cycling Appropriate Code

Night Setback

ESD

Invalid T-stat Inputs

No Fault in Memory

HP Fault

Flashing Code 2

Flashing Code 3

Flashing Code 4

—

Open

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

Open (closed after 15 minutes)

Closed

LP Lockout

FP1 Lockout

FP2 Lockout

CO Lockout

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 contin-

ually until the fault is cleared.

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.

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.

Follow all safety codes. Wear safety glasses and rubber

gloves when using inhibited hydrochloric acid solution.

Observe and follow acid manufacturer’s instructions.

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. The application of an algaecide every three months will

typically eliminate algae problems in most locations.

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.

Refrigerant System — Verify air and water flow rates

are at proper levels before servicing. To maintain sealed circuit-

ry integrity, do not install service gauges unless unit operation

appears abnormal. Check to see that unit is within the super-

heat and subcooling ranges.

Warm solution acts faster, but cold solution is just as effec-

tive if applied for a longer period.

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.

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. 8.

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. 9.

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.

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.

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.

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.

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.

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Refrigerant Charging

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 reclaim refrigerant following accepted

practices.

VENT

PIPE

5’ APPROX

Air Coil Fan Motor Removal

3’ TO 4’

CONDENSER

Before attempting to remove fan motors or motor mounts,

place a piece of plywood over evaporator coils to prevent

coil damage.

Motor power wires need to be disconnected from motor

terminals before motor is removed from unit.

PAIL

1. Shut off unit main power supply.

2. Loosen bolts on mounting bracket so that fan belt can be

removed.

Fig. 8 — Gravity Flow Method

3. Loosen and remove the 2 motor mounting bracket bolts

on left side of bracket.

4. 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

TROUBLESHOOTING

(Fig. 10 and 11, and Table 22)

CONDENSER

When troubleshooting problems with a WSHP, consider the

following.

TANK

REMOVE WATER

REGULATING VALVE

Thermistor — A thermistor may be required for single-

phase units where starting the unit is a problem due to low

voltage. See Fig. 10 for thermistor nominal resistance.

RETURN

FINE MESH

SCREEN

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. 11.

Fig. 9 — Forced Circulation Method

Checking System Charge — Units are shipped with

full operating charge. If recharging is necessary:

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.0

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.

2. Connect pressure gage to discharge line near compressor.

3. After unit conditions have stabilized, read head pressure

on discharge line gage.

NOTE: Operate unit a minimum of 15 minutes before

checking charge.

4. From standard field-supplied Pressure-Temperature chart

for R-22, find equivalent saturated condensing

temperature.

5. Read liquid line temperature on thermometer; then

subtract from saturated condensing temperature. The dif-

ference equals subcooling temperature.

0.0

20.0

40.0

60.0

80.0 100.0 120.0 140.0

Temperature (F)

6. ADD refrigerant to raise the temperature or REMOVE

refrigerant (using standard practices) to lower the temper-

ature (allow a tolerance of ± 3° F), as required.

Fig. 10 — Thermistor Nominal Resistance

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AIR

COIL

SUCTION

°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. 11 — FP1 and FP2 Thermistor Location

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Table 22 — Troubleshooting

FAULT

HEATING COOLING

POSSIBLE CAUSE

SOLUTION

Main Power Problems

Green Status LED Off

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.

HP Fault — Code 2

High Pressure

Reduced or no water flow in Check pump operation or valve operation/setting.

cooling

Check water flow adjust to proper flow rate.

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 Tables 4-12.

Air temperature out of range Bring return air temperature within design parameters.

in heating

Overcharged with refrigerant Check superheat/subcooling vs typical operating condition.

Bad HP switch

Insufficient charge

Check switch continuity and operation. Replace.

Check for refrigerant leaks.

LP/LOC Fault — Code 3

Low Pressure/Loss of

Charge

Compressor pump down at Check charge and start-up water flow.

start-up

FP1 Fault — Code 4

Water Freeze Protection

Reduced or no water flow in Check pump operation or water valve operation/setting.

heating

Plugged strainer or filter. Clean or replace.

Check water flow adjust to proper flow rate.

Inadequate antifreeze level Check antifreeze density with hydrometer.

Improper freeze protect set- Clip JW2 jumper for antifreeze (10 F) use.

ting (30 F vs 10 F)

Water temperature out of

range

Bring water temperature within design parameters.

Bad thermistor

Reduced or no airflow in

cooling

Check temperature and impedance correlation.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check Tables 4-12.

FP2 Fault — Code 5

Air Coil Freeze

Protection

Air temperature out of range Too much cold vent air. Bring entering air temperature within

design parameters.

Improper freeze protect set- Normal airside applications will require 30°F only.

ting (30 F 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.

Condensate Fault —

Code 6

Check slope of unit toward outlet.

Poor venting. Check vent location.

Moisture on sensor

Under voltage

Check for moisture shorting to air coil.

Over/Under Voltage —

Code 7

(Auto Resetting)

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.

Check for poor water flow or airflow.

Over voltage

Performance Monitor —

Code 8

Heating mode FP2>125 F

Cooling mode FP1>125 F

OR FP2< 40 F

FP1 and FP2

Thermistors — Code 9

FP1 temperature is higher

than FP2 temperature

FP2 temperature is higher

than FP1 temperature

Swap FP1 and FP2 thermistors.

No Fault Code Shown

Unit Short Cycles

No compressor operation

Compressor overload

Control board

See scroll compressor rotation section.

Check and replace if necessary.

Reset power and check operation.

Dirty air filter

Unit in 'Test Mode'

Unit selection

Compressor overload

Thermostat position

Unit locked out

Check and clean air filter.

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.

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.

LEGEND

RV — Reversing Valve

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Table 22 — Troubleshooting (cont)

FAULT

HEATING COOLING

POSSIBLE CAUSE

SOLUTION

Only Compressor Runs

Thermostat wiring

Fan motor relay

Check G wiring at heat pump. Jumper G and R for fan operation.

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

Thermostat wiring

Check Y and W wiring at heat pump. Jumper Y and R for compressor

operation in test mode.

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 Tables 4-12.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Tables 4-12.

Reduced or no airflow in

cooling

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 Check superheat and subcooling. Replace metering device.

Check superheat and subcooling .

Defective reversing valve

Thermostat improperly

located

Perform RV touch test.

Check location and for air drafts behind thermostat.

Unit undersized

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Perform Scaling check and clean if necessary.

Scaling in water heat

exchanger

Inlet water too hot or cold

Check load, loop sizing, loop backfill, ground moisture.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Tables 4-12.

High Head Pressure

Reduced or no airflow in

heating

Reduced or no water flow in Check pump operation or valve operation/setting.

cooling

Check water flow and adjust to proper flow rate.

Inlet water too hot

Check load, loop sizing, loop backfill, ground moisture.

Air temperature out of range Bring return air temperature within design parameters.

in heating

Scaling in water heat

exchanger

Perform Scaling check and clean if necessary.

Unit overcharged

Check superheat and subcooling. Reweigh in charge.

Vacuum system and reweigh in charge.

Non-condensables in

system

Restricted metering device Check superheat and subcooling. Replace metering device.

Low Suction Pressure

Reduced 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.

Water temperature out of

range

Bring water temperature within design parameters.

Reduced 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 Tables 4-12.

Air temperature out of range Too much cold vent air. Bring entering air temperature within design

parameters.

Insufficient charge

Airflow too high

Poor performance

Airflow too high

Unit oversized

Check for refrigerant leaks.

Check blower Tables 4-12.

See 'Insufficient Capacity'.

Check blower Tables 4-12.

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Low discharge air

temperature in heating

High humidity

LEGEND

RV — Reversing Valve

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

PC 111 Catalog No. 535-004 Printed in U.S.A. Form 50R-2SI Pg 26 8-02 Replaces: New

Book 1

Tab 5a 5a

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50RTG

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

VALVE

COAX

°F

LIQUID LINE

°F

PSI

°F

PSI

WATER IN

WATER OUT

LOOK UP PRESSURE DROP IN TABLE 16

TO DETERMINE FLOW RATE

COOLING CYCLE ANALYSIS

PSI

°F

SAT

AIR

COIL

SUCTION

°F

COMPRESSOR

DISCHARGE

EXPANSION

VALVE

COAX

°F

LIQUID LINE

°F

PSI

WATER IN

WATER OUT

LOOK UP PRESSURE DROP IN TABLE 16

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.

*97B0014N02*

97B0014N02

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

Book

Tab

PC 111

Catalog No. 535-004

Printed in U.S.A.

Form 50R-2SI

Pg CL-2

8-02

Replaces: New

5a 5a

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