York Predator Dm090 User Manual

INSTALLATION

MANUAL

SINGLE PACKAGE AIR CONDITIONERS AND

SINGLE PACKAGE ELECTRIC UNITS

DM090, 120 and 150

CONTENTS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . .5

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

REFERENCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

APPROVALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

START-UP (COOLING). . . . . . . . . . . . . . . . . . . . . . . . . .37

NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . .39

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . .39

7-1/2 TO 12-1/2 TON

(380V, 3 Phase, 60 HZ)

See following pages for a complete Table of Contents.

NOTES, CAUTIONS AND WARNINGS

The installer should pay particular attention to the words:

NOTE, CAUTION, and WARNING. Notes are intended to

clarify or make the installation easier. Cautions are given

to prevent equipment damage. Warnings are given to alert

installer that personal injury and/or equipment damage

may result if installation procedure is not handled properly.

CAUTION: READ ALL SAFETY GUIDES BEFORE YOU

BEGIN TO INSTALL YOUR UNIT.

SAVE THIS MANUAL

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LIST OF FIGURES

Pg.# Fig. #

UNIT SHIPPING BRACKET . . . . . . . . . . . . . . . . . . . . 10

Fig. #

Pg.#

13 SIDE PANELS WITH HOLE PLUGS . . . . . . . . . . . . . 16

14 RETURN DOWNFLOW PLENUM WITH PANEL . . . 16

15 DISCHARGE PANEL IN PLACE . . . . . . . . . . . . . . . . 16

16 CONDENSATE DRAIN . . . . . . . . . . . . . . . . . . . . . . . 16

17 ELECTRONIC THERMOSTAT FIELD WIRING . . . . 18

18 FIELD WIRING 24 VOLT THERMOSTAT . . . . . . . . . 18

19 FIELD WIRING DISCONNECT . . . . . . . . . . . . . . . . . 19

20 ENTHALPY SET POINT CHART . . . . . . . . . . . . . . . . 23

21 HONEYWELL ECONOMIZER CONTROL W7212 . . 23

22 BELT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 24

23 DRY COIL DELTA P . . . . . . . . . . . . . . . . . . . . . . . . . 32

24 BASIC TROUBLESHOOTING FLOWCHART . . . . . . 40

CONDENSER COVERING . . . . . . . . . . . . . . . . . . . . 10

COMPRESSOR SECTION . . . . . . . . . . . . . . . . . . . . . 10

PREDATOR COMPONENT LOCATION . . . . . . . . . 11

UNIT 4 POINT LOAD . . . . . . . . . . . . . . . . . . . . . . . . . 12

UNIT 6 POINT LOAD . . . . . . . . . . . . . . . . . . . . . . . . . 12

UNIT CENTER OF GRAVITY . . . . . . . . . . . . . . . . . . . 12

UNIT DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 13

BOTTOM DUCT OPENINGS (FROM ABOVE) . . . . . 14

10 REAR DUCT DIMENSIONS . . . . . . . . . . . . . . . . . . . . 14

11 PREDATOR ROOF CURB DIMENSIONS . . . . . . . . 15

12 SUNLINE™ TO PREDATOR TRANSITION ROOF

CURBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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LIST OF TABLES

Pg.# Tbl.#

Tbl.#

Pg.#

UNIT VOLTAGE LIMITATIONS . . . . . . . . . . . . . . . . . 11

UNIT TEMPERATURE LIMITATIONS . . . . . . . . . . . . 11

UNIT WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6 POINT LOAD WEIGHT . . . . . . . . . . . . . . . . . . . . . . 12

4 POINT LOAD WEIGHT . . . . . . . . . . . . . . . . . . . . . . 12

UNIT CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . 13

CONTROL WIRE SIZES . . . . . . . . . . . . . . . . . . . . . . . 17

20 10 TON OPTIONAL MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 26

21 12-1/2 TON STANDARD MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 27

22 12-1/2 TON OPTIONAL MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 27

23 7-1/2 TON STANDARD MOTOR SIDE SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 28

24 7-1/2 TON OPTIONAL MOTOR SIDE SHOT

ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT

POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 19

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 28

25 10 TON STANDARD MOTOR DOWN SHOT

ELECTRICAL DATA - DM090 (7-1/2 TON) WITH

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 29

POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 19

26 10 TON OPTIONAL MOTOR DOWN SHOT

10 ELECTRICAL DATA - DM120 (10 TON) WITHOUT

POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 29

27 12-1/2 TON STANDARD MOTOR SIDE SHOT

11 ELECTRICAL DATA - DM120 (10 TON) WITH POWER

CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . . . . . 20

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 30

28 12-1/2 TON OPTIONAL MOTOR SIDE SHOT

12 ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT

POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 30

29 INDOOR BLOWER SPECIFICATIONS . . . . . . . . . . . 31

30 ADDITIONAL STATIC RESISTANCE . . . . . . . . . . . . 33

31 MOTOR SHEAVE DATUM DIAMETERS . . . . . . . . . . 33

32 ELECTRIC HEAT LIMIT SETTING . . . . . . . . . . . . . . 36

33 ELECTRIC HEAT ANTICIPATOR SETPOINTS . . . . 36

13 ELECTRICAL DATA - DM150 (12-1/2 TON) WITH

POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20

14 PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

15 MINIMUM SUPPLY AIR CFM . . . . . . . . . . . . . . . . . . . 21

16 SUPPLY AIR LIMITATIONS . . . . . . . . . . . . . . . . . . . . 24

34 7.5 TON STANDARD EFFICIENCY SUPERHEAT

CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

17 7-1/2 TON STANDARD MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 25

35 10 TON STANDARD EFFICIENCY SUPERHEAT

CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

18 7-1/2 TON OPTIONAL MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 25

36 12.5 TON STANDARD EFFICIENCY SUPERHEAT

CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

19 10 TON STANDARD MOTOR DOWN SHOT

BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 26

37 UNIT CONTROL BOARD FLASH CODES . . . . . . . . 40

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GENERAL

REFERENCE

Additional information is available in the following reference

forms:

YORK Predator units are single package air conditioners

designed for outdoor installation on a rooftop or slab and for

non-residential use. These units can be equipped with factory

or field installed electric heaters for heating applications.

• General Installation - DM090 - 150, 035-17311-002

• Pre-start & Post-start Check List - 035-18466-000

These units are completely assembled on rigid, permanently

attached base rails. All piping, refrigerant charge, and electri-

cal wiring is factory installed and tested. The units require

electric power and duct connections. The electric heaters

have nickel-chrome elements and utilize single-point power

connection.

• Economizer Accessory -

Downflow Factory Installed, 035-18286-000

Downflow Field Installed, 035-18285-000

Horizontal Field Installed, 035-18287-000

• Motorized Outdoor Air Damper 035-18283-000

• Manual Outdoor Air Damper (0-100%) 035-18282-000

• Manual Outdoor Air Damper (0-35%) 035-18281-000

• Electric Heater Accessory 035-17291-001

SAFETY CONSIDERATIONS

Due to system pressure, moving parts, and electrical compo-

nents, installation and servicing of air conditioning equipment

can be hazardous. Only qualified, trained service personnel

should install, repair, or service this equipment. Untrained

personnel can perform basic maintenance functions of clean-

ing coils and filters and replacing filters.

• Unit Renewal Parts List 035-17288-000

APPROVALS

Design certified by CSA as follows:

Observe all precautions in the literature, labels, and tags

accompanying the equipment whenever working on air condi-

tioning equipment. Be sure to follow all other applicable

safety precautions and codes.

1. For use as a cooling only unit, cooling unit with supple-

mental electric heat or a forced air furnace.

2. For outdoor installation only.

Wear safety glasses and work gloves. Use quenching cloth

and have a fire extinguisher available during brazing opera-

tions.

3. For installation on combustible material and may be

installed directly on combustible flooring or, in the U.S.,

on wood flooring or Class A, Class B or Class C roof cov-

ering materials .

INSPECTION

As soon as a unit is received, it should be inspected for possi-

ble damage during transit. If damage is evident, the extent of

the damage should be noted on the carrier’s freight bill. A

separate request for inspection by the carrier’s agent should

be made in writing.

This product must be installed in strict compliance

with the enclosed installation instructions and any

applicable local, state, and national codes including,

but not limited to, building, electrical, and mechanical

codes.

This furnace is not to be used for temporary heating

of buildings or structures under construction.

Incorrect installation may create a condition where the

operation of the product could cause personal injury

or property damage.

Before performing service or maintenance opera-

tions on unit, turn off main power switch to unit. Elec-

trical shock could cause personal injury. Improper

installation, adjustment, alteration, service or main-

tenance can cause injury or property damage. Refer

to this manual. For assistance or additional informa-

tion consult a qualified installer, service agency.

The installer should pay particular attention to the words:

NOTE, CAUTION, and WARNING. NOTES are intended to

clarify or make the installation easier. CAUTIONS are given

to prevent equipment damage. WARNINGS are given to alert

installer that personal injury and/or equipment damage may

result if installation procedure is not handled properly.

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NOMENCLATURE

6½ - 12½ Ton Predator Model Number Nomenclature

D M 090 C00 A 3 A AA 3

Product Generation

3 = Third Generation

4 = Fourth Generation

Product Category

D = Air Cond., Single Package

Product Identifier

Voltage

Additional Options

Installation Options

M = R-22 Standard Efficiency

A = No Options Installed

B = Option 1

C = Option 2

(See Next Page)

3 = 380-3-60

D = Options 1 & 2

E = Option 3

F = Option 4

Nominal Cooling Capacity - MBH

090 = 7-½ Ton

120 = 10 Ton

150 = 12-½ Ton

G = Options 1 & 3

H = Options 1 & 4

J = Options 1, 2 & 3

K = Options 1, 2 & 4

L = Options 1, 3 & 4

M = Options 1, 2, 3 & 4

N = Options 2 & 3

P = Options 2 & 4

Q = Options 2, 3 & 4

R = Options 3 & 4

S = Option 5

Heat Type & Nominal Heat Capacity

C00 = Cooling Only. Suitable for field installed electric heat

Electric Heat Options

T = Options 1 & 5

U = Options 1, 3 & 5

V = Options 1, 4 & 5

W = Options 1, 3, 4 & 5

X = Options 3 & 5

Y = Options 4 & 5

Z = Options 3, 4 & 5

E09 = 9 kW Electric Heat

E18 = 18 kW Electric Heat

E24 = 24 kW Electric Heat

E36 = 36 kW Electric Heat

E54 = 54 kW Electric Heat

Options

1 = Disconnect

2 = Non-Pwr’d Conv Outlet

3 = Smoke Detector S. A.

4 = Smoke Detector R. A.

5 = Pwr’d Conv Outlet

Airflow

A = Standard Motor

B = Standard Motor/Economizer/Barometric Relief (Downflow only)

C = Standard Motor/Economizer/Power Exhaust (Downflow only)

D = Standard Motor/Motorized Damper (Downflow only)

E = Standard Motor/Horizontal Economizer (No Barometric Relief or Power Exhaust)

F = Standard Motor/Slab Economizer/Power Exhaust (Downflow only)

G = Standard Motor/Slab Economizer/Barometric Relief (Downflow only)

L = Standard Motor/BAS Ready Econ (NoBASController)/Barometric Relief w/2" Pleated Filters (Downflow only)

M = Standard Motor/BAS Ready Econ (NoBASController)/Power Exhaust w/2" Pleated Filters (Downflow only)

N = High Static Motor

P = High Static Motor/Economizer/Barometric Relief (Downflow only)

Q = High Static Motor/Economizer/Power Exhaust (Downflow only)

R = High Static Motor/Motorized Damper (Downflow only)

S = High Static Motor/Horizontal Economizer (No Barometric Relief or Power Exhaust)

T = High Static Motor/Slab Economizer/Power Exhaust (Downflow only)

U =High Static Motor/Slab Economizer/Barometric Relief (Downflow only)

Y = High Static Motor/BAS Ready Econ (NoBASController)/Barometric Relief w/2" Pleated Filters (Downflow only)

Z = High Static Motor/BAS Ready Econ (NoBASController)/Power Exhaust w/2" Pleated Filters (Downflow only)

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NOMENCLATURE, ADDITONAL OPTIONS:

AA None

AB Phase Monitor

AC Coil Guard

AD Dirty Filter Switch

AE Phase Monitor & Coil Guard

AF Phase Monitor & Dirty Filter Switch

AG Coil Guard & Dirty Filter Switch

AH Phase Monitor, Coil Guard, & Dirty Filter Switch

CA CPC Controller with Dirty Filter Switch & Air Proving Switch

CB CPC Controller, DFS, APS & Phase Monitor

CC CPC Controller, DFS, APS & Coil Guard

CD CPC Controller, DFS, APS, Phase Monitor, & Coil Guard

CE CPC Controller, DFS, APS & Technicoat Cond. Coil

CF CPC Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor

CG CPC Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard

CH CPC Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard

CJ CPC Controller, DFS, APS & Technicoat Evap. Coil

CK CPC Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor

CL CPC Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard

CM CPC Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard

CN CPC Controller, DFS, APS & Technicoat Evap. & Cond Coils

CP CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor

CQ CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard

CR CPC Controller, DFS, APS, Technicoat Cond Coils, Phase Monitor, & 2” Pleated Filters

CV CPC Controller, DFS, APS, & 2” Pleated Filters

CX CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, Coil Guard

HA Honeywell Excel 10 Controller with Dirty Filter Switch & Air Proving Switch

HB Honeywell Excel 10 Controller, DFS, APS & Phase Monitor

HC Honeywell Excel 10 Controller, DFS, APS & Coil Guard

HD Honeywell Excel 10 Controller, DFS, APS, Phase Monitor, & Coil Guard

HE Honeywell Excel 10 Controller, DFS, APS & Technicoat Cond. Coil

HF Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor

HG Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard

HH Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard

HJ Honeywell Excel 10 Controller, DFS, APS & Technicoat Evap. Coil

HK Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor

HL Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard

HM Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard

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HN Honeywell Excel 10 Controller, DFS, APS & Technicoat Evap. & Cond Coils

HP Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor

HQ Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard

HR Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard

JA Johnson UNT Controller with Dirty Filter Switch & Air Proving Switch

JB Johnson UNT Controller, DFS, APS & Phase Monitor

JC Johnson UNT Controller, DFS, APS & Coil Guard

JD Johnson UNT Controller, DFS, APS, Phase Monitor, & Coil Guard

JE Johnson UNT Controller, DFS, APS & Technicoat Cond. Coil

JF Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor

JG Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard

JH Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard

Johnson UNT Controller, DFS, APS & Technicoat Evap. Coil

JK Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor

JL Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard

JM Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard

JN Johnson UNT Controller, DFS, APS & Technicoat Evap. & Cond Coils

JP Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor

JQ Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard

JR Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard

NA Novar ETC-3 Controller with Dirty Filter Switch & Air Proving Switch

NB Novar ETC-3 Controller, DFS, APS & Phase Monitor

NC Novar ETC-3 Controller, DFS, APS & Coil Guard

ND Novar ETC-3 Controller, DFS, APS, Phase Monitor, & Coil Guard

NE Novar ETC-3 Controller, DFS, APS & Technicoat Cond. Coil

NF Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor

NG Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard

NH Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard

NJ Novar ETC-3 Controller, DFS, APS & Technicoat Evap. Coil

NK Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor

NL Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard

NM Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard

NN Novar ETC-3 Controller, DFS, APS & Technicoat Evap. & Cond Coils

NP Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor

NQ Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard

NR Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard

TA Technicoat Condenser Coil

TB Technicoat Condenser Coil & Phase Monitor

TC Technicoat Condenser Coil & Coil Guard

TD Technicoat Condenser Coil & Dirty Filter Switch

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TE Technicoat Condenser Coil, Phase Monitor, & Coil Guard

TF Technicoat Condenser Coil, Phase Monitor, & Dirty Filter Switch

TG Technicoat Condenser Coil, Coil Guard, & Dirty Filter Switch

TH Technicoat Condenser Coil, Phase Monitor, Coil Guard, & Dirty Filter Switch

TJ Technicoat Evaporator Coil

TK Technicoat Evaporator Coil & Phase Monitor

TL Technicoat Evaporator Coil & Coil Guard

TM Technicoat Evaporator Coil & Dirty Filter Switch

TN Technicoat Evaporator Coil, Phase Monitor, & Coil Guard

TP Technicoat Evaporator Coil, Phase Monitor, & Dirty Filter Switch

TQ Technicoat Evaporator Coil, Coil Guard, & Dirty Filter Switch

TR Technicoat Evaporator Coil, Phase Monitor, Coil Guard, & Dirty Filter Switch

TS Technicoat Evaporator & Condenser Coils

TT Technicoat Evaporator & Condenser Coils & Phase Monitor

TU Technicoat Evaporator & Condenser Coils & Coil Guard

TV Technicoat Evaporator & Condenser Coils & Dirty Filter Switch

TW Technicoat Evaporator & Condenser Coils, Phase Monitor, & Coil Guard

TX Technicoat Evaporator & Condenser Coils, Phase Monitor, & Dirty Filter Switch

TY Technicoat Evaporator & Condenser Coils, Coil Guard, & Dirty Filter Switch

TZ Technicoat Evaporator & Condenser Coils, Phase Monitor, Coil Guard, & Dirty Filter Switch

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INSTALLATION

INSTALLATION SAFETY INFORMATION

Read these instructions before continuing this appliance

installation. This is an outdoor combination heating and cool-

ing unit. The installer must assure that these instructions are

made available to the consumer and with instructions to

retain them for future reference.

1. Install this furnace only in a location and position as

specified on Page 11 of these instructions.

2. This equipment is not to be used for temporary heating

of buildings or structures under construction.

PRECEDING INSTALLATION

Toolless

Doorknobs

1. Remove the two screws holding the brackets in the front,

rear and compressor side fork-lift slots.

Installation

Instruction

Packet

Bracket

Turn down

Screws

FIGURE 3 - COMPRESSOR SECTION

LIMITATIONS

FIGURE 1 - UNIT SHIPPING BRACKET

These units must be installed in accordance with the follow-

ing:

2. Turn each bracket toward the ground and the protective

plywood covering will drop to the ground.

In U.S.A.:

3. Remove the condenser coil external protective covering

prior to operation.

1. National Electrical Code, ANSI/NFPA No. 70 - Latest

Edition

4. Remove the toolless doorknobs and instruction packet

prior to installation.

2. Local building codes, and

3. Local plumbing and waste water codes, and

4. Other applicable local codes.

Condenser

Coil External

Protective

Covering

Refer to Tables 1 & 2 for unit application data.

If components are to be added to a unit to meet local codes,

they are to be installed at the dealer’s and/or customer’s

expense.

Barometric

Relief Hood in

Shipping Loca-

tion (if included)

Size of unit for proposed installation should be based on heat

loss/heat gain calculation made according to the methods of

Air Conditioning Contractors of America (ACCA).

FIGURE 2 - CONDENSER COVERING

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Simplicity™ Control board

w/screw connector

Disconnect location

(optional disconnect switch)

for T-stat wiring and

network connection

Filter access (2” throw-away)

Terminal block for

hi-voltage connection

Filter drier (solid

core)

Condenser

section

Second model name-

plate inside hinged

access panel

Belt-drive

blower motor

Slideout motor

& blower

assembly for

easy access

adjustment &

service

Dual stage

cooling for

max. comfort

Compressor #2

access (high-

efficiency com-

pressor with

Compressor #1 access (high-

efficiency compressor w/

crankcase heater))

crankcase heater

Slide-out drain pan

with steel 3/4” FPT

connection

Base rails w/fork-

lift slots (3 sides)

and lifting holes)

Roof curbs in eight- and fourteen-inch

heights. Roof curbs for transitioning from

York Sunline™ footprint to the DM

Series footprint are also available

(field-installed accessory)

Side entry power

and control wiring

knockouts

Tool-less door

latch

FIGURE 4 - PREDATOR^®COMPONENT LOCATION

TABLE 1: UNIT VOLTAGE LIMITATIONS

4. For ground level installation, use a level concrete slab

with a minimum thickness of 4 inches. The length and

width should be at least 6 inches greater than the unit

base rails. Do not tie slab to the building foundation.

Power Rating

Minimum

Maximum

380

350

418

5. Roof structures must be able to support the weight of the

unit and its options/accessories. Unit must be installed

on a solid, level roof curb or appropriate angle iron

frame.

TABLE 2: UNIT TEMPERATURE LIMITATIONS

Temperature

Min.

Max.

6. Maintain level tolerance to 1/2” across the entire width

and length of unit.

Wet Bulb Temperature (°F) of Air on

Evaporator Coil

RIGGING AND HANDLING

Dry Bulb Temperature (°F) of Air on

0^*

125

Condenser Coil

Exercise care when moving the unit. Do not remove any

packaging until the unit is near the place of installation. Rig

the unit by attaching chain or cable slings to the lifting holes

provided in the base rails. Spreader bars, whose length

exceeds the largest dimension across the unit, MUST be

used across the top of the unit.

A low ambient accessory is available for operation

down to -20°F.

LOCATION

Use the following guidelines to select a suitable location for

these units:

1. Unit is designed for outdoor installation only.

If a unit is to be installed on a roof curb other than a

YORK roof curb, gasketing must be applied to all

surfaces that come in contact with the unit under-

side.

2. Condenser coils must have an unlimited supply of air.

Where a choice of location is possible, position the unit

on either north or east side of building.

3. Suitable for mounting on roof curb.

Unitary Products Group

035-17311-003-A-0704

TABLE 4: 6 POINT LOAD WEIGHT

Location (lbs.)^*

Model

Before lifting, make sure the unit weight is distrib-

uted equally on the rigging cables so it will lift evenly.

DM090

DM120

DM150

158

168

180

142

151

161

128

136

145

187

198

212

207

219

235

230

244

262

Units may be moved or lifted with a forklift. Slotted openings

in the base rails are provided for this purpose.

Weights include largest gas heat option.

LENGTH OF FORKS MUST BE A MINIMUM OF 60

INCHES.

TABLE 5: 4 POINT LOAD WEIGHT

Location (lbs.)^*

Model

DM090

DM120

DM150

230

245

262

197

209

224

287

305

327

336

357

382

All panels must be secured in place when the unit is

lifted.

Weights include largest gas heat option.

The condenser coils should be protected from rig-

ging cable damage with plywood or other suitable

material.

FIGURE 6 - UNIT 6 POINT LOAD

FIGURE 5 - UNIT 4 POINT LOAD

TABLE 3: UNIT WEIGHTS

Shipping Weight^*(lb.) Operating Weight^†(lb.)

Model

1056

1121

1200

1051

1116

1195

DM090

DM120

DM150

Econ.

FIGURE 7 - UNIT CENTER OF GRAVITY

CLEARANCES

All units require particular clearances for proper operation

and service. Installer must make provisions for adequate

ventilation air in accordance with applicable provisions of the

local building codes. Refer to Table 6 for clearances required

for combustible construction, servicing, and proper unit oper-

ation.

w/ PE

150

148

Elec. Heat

Weights include largest gas heat option.

54kW heater.

†.

Unitary Products Group

035-17311-003-A-0704

Do not permit overhanging structures or shrubs to

obstruct condenser air discharge outlet, combustion

air inlet or vent outlets.

FIGURE 8 - UNIT DIMENSIONS

TABLE 6: UNIT CLEARANCES

NOTE: A one-inch clearance must be provided between

any combustible material and the supply ductwork

for a distance of 3 feet from the unit.

Top^*

72”

36”

Right

12”

36”

0”

Front

Left

Rear^†

Bottom^‡

DETAIL B

Units must be installed outdoors. Overhanging struc-

ture or shrubs should not obstruct condenser air dis-

charge outlet.

†.

To remove the slide-out drain pan, a rear clearance of

sixty inches is required. If space is unavailable, the

drain pan can be removed through the front by separat-

ing the corner wall.

‡.

Units may be installed on combustible floors made from

wood or class A, B or C roof covering materials.

DETAIL C

DETAIL A

Unitary Products Group

035-17311-003-A-0704

32-11/16

6-13/16

Supply

Air

6-13/16

Return

Air

27-1/2

LEFT

21-3/16

19-3/16

17-3/16

12-15/16

7-1/8

FRONT

14-

23/32

Bottom

Power, Control

and

Convenience

Outlet Wiring

Entries

Bottom Gas

Supply Entry

Bottom

Condensate

Entry

16-3/8

18-1/16

19-5/8

63-1/2

FIGURE 9 - BOTTOM DUCT OPENINGS (FROM ABOVE)

FIGURE 10 - REAR DUCT DIMENSIONS

Unitary Products Group

035-17311-003-A-0704

DUCTWORK

DUCT COVERS

Ductwork should be designed and sized according to the

methods in Manual D of the Air Conditioning Contractors of

America (ACCA) or as recommended by any other recog-

nized authority such as ASHRAE or SMACNA.

Units are shipped with the side duct openings covered and a

covering over the bottom of the unit. For bottom duct applica-

tion, no duct cover changes are necessary. For side duct

application, remove the side duct covers and install over the

bottom duct openings. The panels removed from the side

duct connections are designed to be reused by securing each

panel to its respective downflow opening. But keep in mind

that the supply panel is installed with the painted surface UP,

facing the heat exchanger, while the return panel is installed

with the painted surface DOWN, facing the downflow duct

opening. The supply panel is secured with the bracket

(already in place from the factory) and two screws. It’s a snug

fit for the panel when sliding it between the heat exchanger

and unit bottom, but there is room. The return panel is

secured with four screws.

A closed return duct system should be used. This will not

preclude use of economizers or outdoor fresh air intake. The

supply and return air duct connections at the unit should be

made with flexible joints to minimize noise.

The supply and return air duct systems should be designed

for the CFM and static pressure requirements of the job. They

should NOT be sized to match the dimensions of the duct

connections on the unit.

Refer to 9 for bottom air duct openings. Refer to Figure 10 for

rear air duct openings.

FIGURE 11 - PREDATOR^®ROOF CURB DIMENSIONS

FIGURE 12 - SUNLINE™ TO PREDATOR^®TRANSITION ROOF CURBS

Unitary Products Group

035-17311-003-A-0704

CONDENSATE DRAIN

The side condensate drain is reversible and maybe re-ori-

ented to the rear of the cabinet to facilitate condensate pip-

ing. A condensate drain connection is available through the

base pan for piping inside the roof curb. Trap the connection

per Figure 16. The trap and drain lines should be protected

from freezing.

When fastening ductwork to side duct flanges on

unit, insert screws through duct flanges only. DO

NOT insert screws through casing. Outdoor duct-

work must be insulated and water-proofed.

Plumbing must conform to local codes. Use a sealing com-

pound on male pipe threads. Install condensate drain line

from the 3/4 inch NPT female connection on the unit to an

open drain.

FIGURE 13 - SIDE PANELS WITH HOLE PLUGS

Note orientation. Panel is “insulation” side up.

FIGURE 16 - CONDENSATE DRAIN

COMPRESSORS

The compressors are mounted on elastomer insulators. The

mounting bolts have been fully tightened for shipping.

Do not loosen the compressor mounting bolts.

FIGURE 14 - RETURN DOWNFLOW PLENUM WITH

PANEL

FILTERS

Two-inch filters are supplied with each unit. One-inch filters

may be used with no modification to the filter racks. Filters

must always be installed ahead of evaporator coil and must

be kept clean or replaced with same size and type. Dirty fil-

ters reduce the capacity of the unit and result in frosted coils

or safety shutdown. All units use four (4) 20”x25”x2” filters.

The unit should not be operated without filters properly

installed.

Make sure that panel latches are properly positioned

on the unit to maintain an airtight seal.

FIGURE 15 - DISCHARGE PANEL IN PLACE

Unitary Products Group

035-17311-003-A-0704

THERMOSTAT WIRING

The thermostat should be located on an inside wall approxi-

mately 56 inches above the floor where it will not be subject

to drafts, sun exposure or heat from electrical fixtures or

appliances. Follow the manufacturer's instructions enclosed

with thermostat for general installation procedure. Seven (7)

color-coded, insulated wires should be used to connect the

thermostat to the unit. Refer to Table 7 for control wire sizing

and maximum length.

Avoid damage to internal components if drilling

holes for disconnect mounting.

NOTE: Since not all local codes allow the mounting of a dis-

connect on the unit, please confirm compliance with

local code before mounting a disconnect on the unit.

TABLE 7: CONTROL WIRE SIZES

Electrical line must be sized properly to carry the load. USE

COPPER CONDUCTORS ONLY. Each unit must be wired

with a separate branch circuit fed directly from the meter

panel and properly fused.

Maximum Length^*

Wire Size

18 AWG

150 Feet

From the unit to the thermostat and back to the unit.

Refer to Figures 17, 18 and 19 for typical field wiring and to

the appropriate unit wiring diagram mounted inside control

doors for control circuit and power wiring information.

POWER AND CONTROL WIRING

Field wiring to the unit, fuses, and disconnects must conform

to provisions of National Electrical Code (NEC), ANSI/NFPA

No. 70 – Latest Edition (in U.S.A.), current Canadian Electri-

cal Code C221, and/or local ordinances. The unit must be

electrically grounded in accordance with NEC and CEC as

specified above and/or local codes.

When connecting electrical power and control wiring

to the unit, water-proof connectors must be used so

that water or moisture cannot be drawn into the unit

during normal operation. The above water-proofing

conditions will also apply when installing a field sup-

plied disconnect switch.

Voltage tolerances which must be maintained at the com-

pressor terminals during starting and running conditions are

indicated on the unit Rating Plate and Table 1.

The internal wiring harnesses furnished with this unit are an

integral part of the design certified unit. Field alteration to

comply with electrical codes should not be required. If any of

the wire supplied with the unit must be replaced, replacement

wire must be of the type shown on the wiring diagram and the

same minimum gauge as the replaced wire.

POWER WIRING DETAIL

Units are factory wired for the voltage shown on the unit

nameplate. Refer to Electrical Data Tables 8 through 13 size

power wiring, fuses, and disconnect switch.

A disconnect must be utilized for these units. Factory

installed disconnects are available. If installing a disconnect

Power wiring is brought into the unit through the side of the

unit or the basepan inside the curb.

(field supplied or York International supplied accessory),

refer to Figure 4 for the recommended mounting location.

Unitary Products Group

035-17311-003-A-0704

(

)

FIGURE 17 - ELECTRONIC THERMOSTAT FIELD WIRING

FIGURE 18 - FIELD WIRING 24 VOLT THERMOSTAT

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035-17311-003-A-0704

FIGURE 19 - FIELD WIRING DISCONNECT

TABLE 8: ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET

Min.

MCA

Max

Fuse*

Size

Max Fuse*

Size

Supply

Blower

Pwr

Exh

Pwr

OD Fan

Motors

Circuit

w/Power

Compressors

Conv

Electric Heater Actual Heater

Ampacity Exhaust

(Amps) (Amps)

1.5 1.5

HP HP HP HP HP HP HP

w/Power

Voltage

Motor FLA Motor Outlet

Model No.

Amps

(Amps)

Exhaust

RLA

ea.

LRA

ea.

FLA

ea.

1.5

FLA

None

20.7 21.7 22.9 23.9 25 25

25.3 26.6 28.1 29.3 30 30

32.4 33.6 35.1 36.4 35 35

44.3 45.6 47.1 48.3 45 50

2TP04520950

2TP04521850

2TP04522450

2TP04523650

5.6

11.3

8.5

380

7.1

54.0

0.8

3.1

4.1

2.2

0.0

17.2

22.8

32.4

21.3

Maximum HACR breaker of the same AMP size is applicable.

TABLE 9: ELECTRICAL DATA - DM090 (7-1/2 TON) WITH POWER CONVENIENCE OUTLET

Min.

MCA

Max

Fuse*

Size

Max Fuse*

Size

Supply

Blower

Pwr

Exh

Pwr

OD Fan

Motors

Circuit

w/Power

Compressors

Conv

Electric Heater Actual Heater

Ampacity Exhaust

(Amps) (Amps)

1.5 1.5

HP HP HP HP HP HP HP

w/Power

Exhaust

Voltage

Motor FLA Motor Outlet

Model No.

Amps

(Amps)

RLA

ea.

LRA

ea.

FLA

ea.

1.5

FLA

None

28 29.2 30.2 30 35

2TP04520950

2TP04521850

2TP04522450

2TP04523650

5.6

11.3

8.5

380

7.1

54.0

0.8

3.1

4.1

2.2

6.3

17.2

22.8

32.4

33.2 34.5 36 37.2 35 35

40.2 41.5 43 44.2 45 45

52.2 53.5 55 56.2 60 60

21.3

Maximum HACR breaker of the same AMP size is applicable.

Unitary Products Group

035-17311-003-A-0704

TABLE 10: ELECTRICAL DATA - DM120 (10 TON) WITHOUT POWER CONVENIENCE OUTLET

MCA

Max

Fuse*

Size

Max Fuse*

Size

Supply

Blower Motor Exh

FLA

Pwr

Min. Circuit

Ampacity

(Amps)

OD Fan

Motors

w/Power

Exhaust

(Amps)

Compressors

Conv

Electric Heater Actual Heater

w/Power

Exhaust

Voltage

Motor Outlet

Model No.

Amps

(Amps)

RLA

ea.

LRA

ea.

FLA

ea.

FLA

HP HP HP HP HP HP HP

None

33.2 34.4 35.4 36.6 40 45

33.6 35.1 36.4 37.9 40 45

45.6 47.1 48.3 49.8 50 50

69.3 70.8 72.1 73.6 70 80

2TP04521850

2TP04522450

2TP04523650

2TP04525450

11.3

17.2

22.8

32.4

51.4

380

11.5

75.0

1.6

4.1

5.3

2.2

0.0

21.3

33.8

Maximum HACR breaker of the same AMP size is applicable.

TABLE 11: ELECTRICAL DATA - DM120 (10 TON) WITH POWER CONVENIENCE OUTLET

MCA

Max

Fuse*

Size

Max Fuse*

Size

Supply

Blower Motor Exh

FLA

Pwr

Min. Circuit

Ampacity

(Amps)

OD Fan

Motors

w/Power

Exhaust

(Amps)

Compressors

Conv

Electric Heater Actual Heater

w/Power

Exhaust

Voltage

Motor Outlet

Model No.

Amps

(Amps)

RLA

ea.

LRA

ea.

FLA

ea.

FLA

HP HP HP HP HP HP HP

None

39.5 40.7 41.7 42.9 50 50

41.5 43 44.2 45.7 50 50

53.5 55 56.2 57.7 60 60

77.2 78.7 79.9 81.4 80 80

2TP04521850

2TP04522450

2TP04523650

2TP04525450

11.3

17.2

22.8

32.4

51.4

380

11.5

75.0

1.6

4.1

5.3

2.2

6.3

21.3

33.8

Maximum HACR breaker of the same AMP size is applicable.

TABLE 12: ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET

Min.

MCA

Max

Fuse*

Size

Max Fuse*

Size

Supply

Blower

Pwr

Exh

Pwr

OD Fan

Motors

Circuit

w/Power

Compressors

Conv

Electric Heater Actual Heater

Ampacity Exhaust

(Amps) (Amps)

w/Power

Exhaust

Voltage

Motor FLA Motor Outlet

Model No.

Amps

(Amps)

RLA

ea.

LRA

ea.

FLA

ea.

FLA

HP HP HP HP HP HP HP

None

36.0 38.8 38.2 41.0 45 50

36.0 38.8 38.2 41.4 45 50

47.1 50.6 49.8 53.3 50 60

70.8 74.3 73.6 77.1 80 80

2TP045E11850

2TP045E12450

2TP045E13650

2TP045E15450

11.3

17.2

22.8

32.4

51.4

380

12.2

88.0

1.6

5.3

8.1

2.2

0.0

21.3

33.8

Maximum HACR breaker of the same AMP size is applicable.

TABLE 13: ELECTRICAL DATA - DM150 (12-1/2 TON) WITH POWER CONVENIENCE OUTLET

MCA

Max

Max Fuse*

Size

Supply

Blower Motor Exh

FLA

Pwr

Min. Circuit

Ampacity

(Amps)

OD Fan

Motors

w/Power

Exhaust

(Amps)

Fuse*

Compressors

Conv

Electric Heater Actual Heater

Size

w/Power

Exhaust

Voltage

Motor Outlet

Model No.

Amps

(Amps)

RLA

ea.

LRA

ea.

FLA

ea.

FLA

HP HP HP HP HP HP HP

None

42.3 45.1 44.5 47.3 50 50

43 46.5 45.7 49.2 50 50

55 58.5 57.7 61.2 60 60

78.7 82.2 81.4 84.9 80 90

2TP045E11850

2TP045E12450

2TP045E13650

2TP045E15450

11.3

17.2

22.8

32.4

51.4

380

12.2

88.0

1.6

5.3

8.1

2.2

6.3

21.3

33.8

Maximum HACR breaker of the same AMP size is applicable.

Unitary Products Group

035-17311-003-A-0704

TABLE 14: PHYSICAL DATA

Models

120

Component

090

150

Blower, Centrifugal (Dia. X Wd. in.)

15 x 15

Evaporator

Blower

Motor, Standard (HP)

Motor, Optional (HP)

Rows

1-1/2

Fins per Inch

Evaporator

Height (in.)

Coil

10.6

13.2

Face Area (ft. each)

Propeller Dia. (in., each)

Motor (HP, each)

CFM, Nominal (each)

Rows (each)

1/3

3400

3/4

4400

3/4

4400

Condenser

Fan

(2 per Unit)

Condenser

Coil

(2 per unit)

Fins per Inch

Height (in. each)

9.2

4/12

4/6

14.5

6/12

14.5

10/12

11/0

Face Area (ft. each)

System 1 (lb./oz.)

System 2 (lb./oz.)

Refrigerant

Charge

Quantity

Type

Recip

25x20x2

Recip

25x20x2

Scroll

25x20x2

Compressors

Air Filters

Size (Wd. x Ht. x Thickness in.)

Number Per Unit

OPTIONS/ACCESSORIES

TABLE 15: MINIMUM SUPPLY AIR CFM

ELECTRIC HEAT ACCESSORIES

Heater

Unit Model Size, Nominal Tons

7.5 10

Minimum Supply Air CFM

Electric heaters are available as field installed accessories.

Refer to electric heat instructions for installation. These heat-

ers mount in the heat compartment with the heating elements

extending into the supply air chamber. All electric heaters are

fused and intended for use with single point power supply.

12.5

Voltage

2250

N/A

2250

N/A

3000

3750

ELECTRIC HEAT OPTION

380

The factory-installed heaters are wired for single point power

supply. Power supply need only be brought into the single

point terminal block.

These CSA approved heaters are located within the central

compartment of the unit with the heater elements extending

into the supply air chamber.

MOTORIZED OUTDOOR DAMPER

The Motorized Outdoor Damper can be a factory installed

option or a field installed accessory. If factory installed, refer

to the instructions included with the outdoor air hood to com-

plete the assembly. Field installed Motorized Outdoor

Damper accessories include complete instructions for instal-

lation.

Fuses are supplied, where required, by the factory. Some kW

sizes require fuses and other do not. Refer to Table 15 for

minimum CFM limitations and to Tables 8 through 13 for elec-

trical data.

Unitary Products Group

035-17311-003-A-0704

ECONOMIZER

ON position and then OFF or energize and de-energize

terminals “R” to “G”.

The Economizer can be a factory installed option or a field

installed accessory. If factory installed, refer to the instruc-

tions included with the outdoor air hood to complete the

assembly. Field installed Economizer accessories include

complete instructions for installation.

•

With the thermostat set to the indoor fan ON position or

terminals “R” to “G” energized, turn the Minimum Posi-

tion Adjusting screw (located on the damper control

module) counterclockwise until the desired minimum

damper position has been attained.

There are two Economizer options:

ENTHALPY SET POINT ADJUSTMENT

1. Down Flow application with barometric relief hood

standard.

The enthalpy set point may now be set by selecting the

desired set point shown in the Enthalpy Set Point Adjustment

Figure 20. Adjust as follows:

2. Horizontal Flow application that requires the purchase of

a barometric relief hood.

POWER EXHAUST

•

For a single enthalpy operation carefully turn the set

point adjusting screw (found on the damper control mod-

ule) to the "A", "B", "C" or "D" setting corresponding to

the lettered curve of the Enthalpy Set Point Adjustment

Figure 20.

The Power Exhaust can be a factory installed option or a field

installed accessory. If factory installed, refer to the instruc-

tions included with the outdoor air hood to complete the

assembly. Field installed Power Exhaust accessories include

complete instructions for installation.

•

For a dual enthalpy operation, carefully turn the set point

adjusting screw fully clockwise past the "D" setting.

The Power Exhaust factory installed option is for Down Flow

application only.

POWER EXHAUST DAMPER SET POINT (WITH OR WITH-

OUT POWER EXHAUST)

There are two field installed Power Exhaust accessories:

1. Down Flow application.

•

With no power exhaust option, adjust the Exhaust Air

Adjustment Screw fully clockwise. This will allow 2nd

stage cooling to operate.

2. Horizontal Flow application that requires the purchase of

a barometric relief hood.

•

With power exhaust option, each building pressurization

requirement will be different. The point at which the

power exhaust comes on is determined by the econo-

mizer damper position (Percent Open). The Exhaust Air

Adjustment Screw should be set at the Percent Open of

the economizer damper at which the power exhaust is

needed. It can be set from 0 to 100% damper open.

RAIN HOOD

All of the hood components, including the filters, the gasket-

ing and the hardware for assembling, are packaged and

located between the condenser coil section and the main unit

cabinet, if the unit has factory installed options. If field

installed accessories are being installed all parts necessary

for the installation comes in the accessory.

INDOOR AIR QUALITY AQ

Indoor Air Quality (indoor sensor input): Terminal AQ accepts

a +2 to +10 Vdc signal with respect to the (AQ1) terminal.

When the signal is below it's set point, the actuator is allowed

to modulate normally in accordance with the enthalpy and

mixed air sensor inputs. When the AQ signal exceeds it's set

point setting and there is no call for free cooling, the actuator

is proportionately modulated from the 2 to 10 Vdc signal, with

2 Vdc corresponding to full closed and 10 Vdc corresponding

to full open. When there is no call for free cooling, the damper

position is limited by the IAQ Max damper position setting.

When the signal exceeds it's set point (Demand Control Ven-

tilation Set Point) setting and there is a call for free cooling,

the actuator modulates from the minimum position to the full

open position based on the highest call from either the mixed

air sensor input or the AQ voltage input.

ECONOMIZER AND POWER EXHAUST SET POINT

ADJUSTMENTS AND INFORMATION

Remove the top rear access panel from the unit. Locate the

economizer control module, where the following adjustments

will be made.

Extreme care must be exercised in turning all set

point, maximum and minimum damper positioning

adjustment screws to prevent twisting them off.

MINIMUM POSITION ADJUSTMENT

•

Optional CO Space Sensor Kit Part # 2AQ04700324

•

Check that the damper blades move smoothly without

binding; carefully turn the Minimum Position Adjust

screw (found on the damper control module) fully clock-

wise and then set the thermostat indoor fan switch to the

Optional CO Sensor Kit Part # 2AQ04700424

Replace the top rear access panel on the unit.

Unitary Products Group

035-17311-003-A-0704

CONTROL POINT

APPROX. ⁰F (⁰C)

AT 50% RH

CONTROL

CURVE

85 90 95 100 105 110

(29) (32) (35) (38) (41) (43)

73 (23)

70 (21)

67 (19)

63 (17)

(27)

(24)

(21)

(18)

(16)

(13)

(10)

(7)

(4)

(2)

40 45

(4) (7)

65 70 75 80

(24) (27)

105 110

(41) (43)

(2)

50 55 60

(10) (13) (16)

85 90

(29) (32)

100

(38)

(21)

(18)

(35)

APPROXIMATE DRY BULB TEMPERATURE - ⁰F (⁰C)

FIGURE 20 - ENTHALPY SET POINT CHART

Exhaust Air

Adjustment

Screw

EXH

Set

TR1

Exhaust Air LED

Damper Min.

Position

Screw

Vac

HOT

Vac

COM

EXH

Min

Pos

Indoor Air Quality

Max. Adjustment

Screw

IAQ

Max

Indoor Air Quality

LED

IAQ

AQ1

SO+

Indoor Air Quality

Min. Adjustment

Screw

IAQ

Min

Free

Cool

Free Cooling LED

SR+

EF1

Economizer Enthalpy

Set Point Adjustment

Screw

FIGURE 21 - HONEYWELL ECONOMIZER CONTROL W7212

Unitary Products Group

035-17311-003-A-0704

PHASING

Predator units are properly phased at the factory. Check for

proper compressor rotation. If the blower or compressors

rotate in the wrong direction at start-up, the electrical connec-

tion to the unit is misphased. Change the phasing of the Field

Line Connection at the factory or field supplied discon-

nect to obtain proper rotation. (Scroll compressors operate in

only one direction. If the scroll is drawing low amperage, has

similar suction and discharge pressures, or producing a high

noise level, the scroll is misphased.)

* NEVER LOOSEN

SPAN LENGTH

DEFL. FORCE

Scroll compressors require proper rotation to oper-

ate correctly. Units are properly phased at the fac-

tory. Do not change the internal wiring to make the

blower condenser fans, or compressor rotate cor-

rectly.

BLOWER ROTATION

Check for proper supply air blower rotation. If the blower is

rotating backwards, the line voltage at the unit point of power

connection is misphased (See ‘PHASING’).

FIGURE 22 - BELT ADJUSTMENT

TABLE 16: SUPPLY AIR LIMITATIONS

Unit Size

Minimum

Maximum

090

120

150

2250

3000

3750

5000

6250

Procedure for adjusting belt tension:

1. Loosen six nuts (top and bottom) A.

2. Adjust by turning (B).

3. Never loosen nuts (C).

BELT TENSION

4. Use belt tension checker to apply a perpendicular

force to one belt at the midpoint of the span as

shown. Deflection distance of 4mm (5/32”) is

obtained.

The tension on the belt should be adjusted as shown in

Figure 22.

To determine the deflection distance from normal

position, use a straight edge from sheave to sheave

as reference line. The recommended deflection

force is as follows:

Tension new belts at the max. deflection force rec-

ommended for the belt section. Check the belt ten-

sion at least two times during the first 24 hours of

operation. Any retensioning should fall between the

min. and max. deflection force values.

5. After adjusting retighten nuts (A).

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 17: 7-1/2 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.2

0.4

0.6

0.8

1.0

3715 1573 1.69

3510 1490 1.60

3146 1351 1.45

2622 1167 1.25

3634 1434 1.54

3320 1313 1.41

2910 1169 1.25

2404 1013 1.09

3431 1265 1.36

3079 1145 1.23

2621 1005 1.08

3218 901 0.97

2832 810 0.87

2307 706 0.76

3024 976 1.05

2586 860 0.92

3650 1657 1.78

3334 1522 1.63

2903 1352 1.45

2356 1159 1.24

2054

858

0.92

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 18: 7-1/2 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

3992 1904 2.04 3798 1679 1.80

3930 2017 2.16 3734 1786 1.92 3486 1552 1.66

3947 2176 2.33 3670 1895 2.03 3394 1641 1.76 3084 1401 1.50

4138 2384 2.56 3623 2009 2.15 3323 1742 1.87 2971 1477 1.58 2591 1236 1.33

4126 2430 2.61 3643 2145 2.30 3224 1820 1.95 2889 1569 1.68 2466 1306 1.40

3613 2238 2.40 3143 1921 2.06 2748 1621 1.74 2369 1385 1.49

3099 2039 2.19 2636 1714 1.84 2195 1424 1.53

2586 1833 1.97

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 19: 10 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.2

0.4

0.6

0.8

1.0

3896 1639 1.76 3688 1453 1.56 3447 1268 1.36

4040 2076 2.23 4005 1934 2.07 3790 1698 1.82 3569 1508 1.62 3333 1330 1.43 3057 1147 1.23

3890 2006 2.15 3697 1790 1.92 3427 1550 1.66 3152 1356 1.45

3620 1882 2.02 3324 1629 1.75 2972 1380 1.48

3227 1708 1.83

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 20: 10 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

1.6

4965 3485 3.74 4875 3150 3.38 4613 2739 2.94 4322 2374 2.55 4156 2106 2.26 3907 1860 1.99

4876 3416 3.66 4651 2997 3.21 4359 2582 2.77 4038 2220 2.38 3860 1966 2.11 3590 1724 1.85

4713 3291 3.53 4387 2823 3.03 4077 2417 2.59 3719 2059 2.21 3541 1827 1.96 3242 1584 1.70

4476 3116 3.34 4084 2632 2.82 3768 2245 2.41 3365 1892 2.03 3197 1691 1.81

4165 2898 3.11 3741 2427 2.60 3432 2070 2.22

3779 2646 2.84 3359 2212 2.37 3069 1895 2.03

3319 2372 2.54

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 21: 12-1/2 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

5078 3630 3.89 4809 3103 3.33 4594 3053 3.27 4360 2478 2.66 4090 2093 2.24 3812 1798 1.93

4865 3456 3.71 4584 2961 3.17 4349 2912 3.12 4106 2318 2.49 3814 1964 2.11

4642 3284 3.52 4356 2828 3.03 4089 2776 2.98 3840 2137 2.29

4408 3114 3.34 4124 2705 2.90 3815 2647 2.84

4164 2947 3.16 3889 2592 2.78

3910 2787 2.99

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 22: 12-1/2 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

5994 5400 5.79 5565 4369 4.69 5488 4169 4.47 5264 3599 3.86 4990 3085 3.31 4738 2812 3.02

5824 5216 5.59 5368 4186 4.49 5289 3991 4.28 5049 3437 3.69 4763 2937 3.15 4491 2655 2.85

5641 5022 5.39 5170 4012 4.30 5076 3807 4.08 4822 3272 3.51 4528 2790 2.99 4235 2497 2.68

5444 4819 5.17 4971 3846 4.12 4847 3618 3.88 4584 3103 3.33 4286 2644 2.83 3969 2340 2.51

5233 4609 4.94 4771 3687 3.95 4604 3426 3.67 4335 2933 3.15 4035 2499 2.68

5009 4394 4.71 4571 3537 3.79 4346 3233 3.47 4074 2762 2.96 3777 2356 2.53

4771 4174 4.48 4370 3395 3.64 4074 3040 3.26 3802 2590 2.78

4520 3951 4.24 4169 3262 3.50 3786 2850 3.06

4255 3728 4.00 3966 3137 3.36

3976 3505 3.76 3763 3020 3.24

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 23: 7-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

3736 1476 1.58 3487 1284 1.38 3231 1109 1.19 3001 970

1.04

3572 1514 1.62 3389 1339 1.44 3094 1151 1.23 2764

972

1.04 2446 824

0.88

3422 1558 1.67 3179 1364 1.46 2889 1164 1.25 2554

985

1.06

2891 1347 1.44 2372 1088 1.17 2050

2017 1051 1.13

922

0.99

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 24: 7-1/2 TON OPTIONAL MOTOR SIDE SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

3910 1726 1.85

3857 1842 1.98 3597 1430 1.53

3804 1957 2.10 3503 1689 1.81 3172 1430 1.53

3774 2088 2.24 3406 1778 1.91 3032 1497 1.61 2248 1143 1.23

3327 1866 2.00 2926 1578 1.69 2160 1217 1.31

3270 1971 2.11 2537 1544 1.66 2043 1296 1.39

3196 2077 2.23 2460 1651 1.77

2426 1768 1.90

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 25: 10 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.2

0.4

0.6

0.8

1.0

3896 1639 1.76 3688 1453 1.56 3447 1268 1.36

4040 2076 2.23 4005 1934 2.07 3790 1698 1.82 3569 1508 1.62 3333 1330 1.43 3057 1147 1.23

3890 2006 2.15 3697 1790 1.92 3427 1550 1.66 3152 1356 1.45

3620 1882 2.02 3324 1629 1.75 2972 1380 1.48

3227 1708 1.83

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 26: 10 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

1.6

4965 3485 3.74 4875 3150 3.38 4613 2739 2.94 4322 2374 2.55 4156 2106 2.26 3907 1860 1.99

4876 3416 3.66 4651 2997 3.21 4359 2582 2.77 4038 2220 2.38 3860 1966 2.11 3590 1724 1.85

4713 3291 3.53 4387 2823 3.03 4077 2417 2.59 3719 2059 2.21 3541 1827 1.96 3242 1584 1.70

4476 3116 3.34 4084 2632 2.82 3768 2245 2.41 3365 1892 2.03 3197 1691 1.81

4165 2898 3.11 3741 2427 2.60 3432 2070 2.22

3779 2646 2.84 3359 2212 2.37 3069 1895 2.03

3319 2372 2.54

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

Unitary Products Group

035-17311-003-A-0704

* †

TABLE 27: 12-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

5201 3162 3.39 4966 2796 3.00 4681 2405 2.58 4355 2054 2.20

0.4

0.6

0.8

1.0

1.2

1.4

5220 3395 3.64 4942 2980 3.20 4657 2608 2.80 4358 2230 2.39 4007 1890 2.03

4944 3194 3.43 4661 2806 3.01 4378 2572 2.76 4016 2057 2.21

5003 3490 3.74 4647 2988 3.20 4380 2636 2.83 4030 2257 2.42

4724 3290 3.53 4363 2875 3.08 4012 2505 2.69

4428 3040 3.26

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

* †

TABLE 28: 12-1/2 TON OPTIONAL MOTOR SIDE SHOT BLOWER PERFORMANCE

TURNS OPEN^**

ESP^‡

W^††

CFM

BHP CFM

BHP

CFM

BHP CFM

BHP

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

6447 5315 5.70 6207 4760 5.1046 5966 4205 4.51 5717 3716 3.98 5470 3307 3.55

6110 4917 5.27 5965 4464

5772 4519 4.85 5741 4274

4.79

4.58

4.34

4.13

3.94

3.71

3.47

3.07

5740 4023 4.31 5430 3501 3.75 5126 3054 3.28

5503 3821 4.10 5162 3294 3.53 4849 2870 3.08

5244 3611 3.87 4882 3101 3.33 4530 2667 2.86

4941 3387 3.63 4589 2906 3.12 4225 2502 2.68

4651 3178 3.41 4284 2716 2.91 3858 2280 2.45

4365 2983 3.20 3951 2516 2.70 3491 2058 2.21

6235 5521 5.92 5628 4407 4.73 5474 4048

5881 5137 5.51 5384 4205 4.51 5248 3854

5695 4950 5.31 5123 3996 4.29 5014 3670

5471 4728 5.07 4919 3828 4.11 4732 3460

5242 4514 4.84 4656 3611 3.87 4438 3240

4954 4231 4.54 4339 3380 3.62 3905 2861

3998 2740 2.94 3618 2316 2.48

3631 2497 2.68

4585 3934 4.22 4022 3149 3.38

4217 3637 3.90

3848 3340 3.58

Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.

Blower performance includes two-inch throwaway filters.

†.

‡.

ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been

deducted from the total static pressure of the blower.

**.

“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.

W = Watts

††.

NOTES FOR TABLE 17 THROUGH TABLE 28:

•

Blower performance includes dry coil and two-inch

filters.

Blower performance for gas heat includes the maximum

number of heat tubes available for each tonnage.

•

ESP (External Static Pressure) given is that available for

the supply and return air duct system. All internal resis-

tances have been deducted from the total static pressure

of the blower.

Unitary Products Group

035-17311-003-A-0704

TABLE 29: INDOOR BLOWER SPECIFICATIONS

MOTOR

RPM Eff.

1-1/2 1725 80% 1.15

MOTOR SHEAVE

BLOWER SHEAVE

MODEL

DM090

DM120

DM150

BELT

SF Frame Datum Dia. (in.) Bore (in.) Model Datum Dia. (in.) Bore (in.) Model

3.4 - 4.4

4.3 - 5.3

7/8

1VM50

1VP56

9.0

7.5

8.5

7.0

6.7

AK94

AK79

AK89

AK74

BK77

A57

A55

A56

A54

BX55

1725 80% 1.15

1725 87% 1.15

7/8

184T

1 1/8

AIR BALANCE

Start the supply air blower motor. Adjust the resistances in both the supply and the return air duct systems to balance the air

distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other

than the equipment installer.

CHECKING AIR QUANTITY

METHOD ONE

METHOD TWO

1. Remove the dot plugs from the duct panel (for location of

the dot plugs see Figure 10).

1. Drill two 5/16 inch holes, one in the return air duct as

close to the inlet of the unit as possible, and another in

the supply air duct as close to the outlet of the unit as

possible.

2. Insert eight-inches of 1/4 inch metal tubing into the air-

flow on both sides of the indoor coil.

2. Using the whole drilled in step 1, insert eight inches of

1/4 inch metal tubing into the airflow of the return and

supply air ducts of the unit.

NOTE: The tubes must be inserted and held in a position

perpendicular to the air flow so that velocity pres-

sure will not affect the static pressure readings.

NOTE: The tubes must be inserted and held in position per-

pendicular to the airflow so that velocity pressure

will not affect the static pressure readings.

3. Use an Inclined Manometer or Magnehelic to determine

the pressure drop across a dry evaporator coil. Since the

moisture on an evaporator coil can vary greatly, measur-

ing the pressure drop across a wet coil under field condi-

tions could be inaccurate. To assure a dry coil, the

compressors should be de-activated while the test is

being run.

3. Use an Inclined Manometer or Magnehelic to determine

the pressure drop across the unit. This is the External

Static Pressure (ESP). In order to obtain an accurate

measurement, be certain that the air filters are clean.

4. Determine the number of turns the variable motor

sheave is open.

NOTE: De-energize the compressors before taking any test

measurements to assure a dry evaporator coil.

5. Select the correct blower performance table for the unit

from Tables 17 - 28. Tables are presented for horizontal

and downflow configuration.

4. The CFM through the unit can be determined from the

pressure drop indicated by the manometer by referring to

Figure 23. In order to obtain an accurate measurement,

be certain that the air filters are clean.

6. Determine the unit Measured CFM from the Blower Per-

formance Table, External Static Pressure and the num-

ber of turns the variable motor sheave is open.

5. To adjust Measured CFM to Required CFM, see ’SUP-

PLY AIR DRIVE ADJUSTMENT’.

7. To adjust Measured CFM to Required CFM, see ’SUP-

PLY AIR DRIVE ADJUSTMENT’.

6. After readings have been obtained, remove the tubes

and replace the dot plugs.

8. After reading has been obtained, remove the tubes and

seal holes.

NOTE: With the addition of field installed accessories

repeat this procedure.

Failure to properly adjust the total system air quan-

tity can result in extensive blower damage.

Failure to properly adjust the total system air quan-

tity can result in extensive blower damage.

Unitary Products Group

035-17311-003-A-0704

FIGURE 23 - DRY COIL DELTA P

SUPPLY AIR DRIVE ADJUSTMENT

EXAMPLE

A 12.5 ton unit was selected to deliver 4,000 CFM with a 3

HP motor, but the unit is delivering 3,800 CFM. The variable

pitch motor sheave is set at 2 turns open.

Before making any blower speed changes review

the installation for any installation errors, leaks or

undesirable systems effects that can result in loss of

airflow.

Use the equation to determine the required DD for the new

motor sheave,

4,000 CFM

3,800 CFM

• 4.0 in. = 4.21 in.

(

)

Even small changes in blower speed can result in

substantial changes in static pressure and BHP.

BHP and AMP draw of the blower motor will

increase by the cube of the blower speed. Static

pressure will increase by the square of the blower

speed. Only qualified personnel should make blower

speed changes, strictly adhering to the fan laws.

Use Table 31 to locate the DD nearest to 4.21 in. Close the

sheave to 1 turn open.

New BHP

= (Speed increase)³• BHP at 3,800 CFM

At unit start-up, the measured CFM may be higher or lower

than the required CFM. To achieve the required CFM, the

speed of the drive may have adjusted by changing the datum

diameter (DD) of the variable pitch motor sheave as

described below:

= (Speed increase)³• Original BHP

= New BHP

Required CFM

Measured CFM

New motor Amps

(

• Existing DD = New DD

)

= (Speed increase)³• Amps at 3,800 CFM

Use the following tables and the DD calculated per the above

equation to adjust the motor variable pitch sheave.

= (Speed increase)³• Original Amps

= New Amps

Unitary Products Group

035-17311-003-A-0704

TABLE 30: ADDITIONAL STATIC RESISTANCE

Electric Heat KW^†

† ‡

CFM

Cooling Only

Economizer

2300

2500

2700

2900

3100

3300

3500

3700

3900

4100

4300

4500

4700

4900

5100

5300

5500

5700

5900

6100

6300

0.08

0.09

0.11

0.12

0.14

0.16

0.18

0.20

0.23

0.25

0.28

0.30

0.33

0.36

0.39

0.42

0.45

0.48

0.52

0.56

0.60

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

0.12

0.13

0.15

0.17

0.19

0.21

0.23

0.25

0.28

0.30

0.33

0.35

0.38

0.41

0.44

0.47

0.50

0.08

0.09

0.10

0.11

0.13

0.14

0.16

0.18

0.20

0.22

0.24

0.26

0.29

0.31

0.34

0.37

0.40

0.43

0.46

0.49

0.53

0.09

0.10

0.12

0.13

0.15

0.17

0.19

0.21

0.23

0.25

0.28

0.30

0.33

0.35

0.38

0.41

0.44

0.47

0.50

0.53

0.56

0.10

0.11

0.13

0.14

0.16

0.18

0.20

0.22

0.24

0.26

0.29

0.31

0.34

0.37

0.40

0.43

0.46

0.49

0.53

0.56

0.59

0.13

0.14

0.16

0.18

0.20

0.22

0.24

0.26

0.28

0.31

0.34

0.37

0.40

0.43

0.46

0.49

0.53

0.56

0.59

0.62

0.65

Add these resistance values to the available static resistance in the respective Blower Performance Tables.

†.

‡.

Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.

The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return

air duct system is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

OPERATION

TABLE 31: MOTOR SHEAVE DATUM DIAMETERS

1VM50x7/8

(1-1/2, 2 & 3 HP Motor)

1VP56x1-1/8

(5 HP Motor)

SEQUENCE OF OPERATIONS OVERVIEW

Datum

Turns Open

Datum

Diameter

Turns Open

For the Predator series of units, the thermostat makes a cir-

Diameter

cuit between "R" and "Y1" for the first stage of cooling.

1/2

4.4

4.3

4.2

4.1

4.0

3.9

3.8

3.7

3.6

3.5

3.4

1-1/2

5.3

5.2

The call is passed to the Unit Control Board (UCB), which

then determines whether the requested operation is available

and, if so, which components to energize.

5.1

1-1/2

2-1/2

5.0

4.9

When the "W1" call is sensed, the indoor air blower is ener-

gized following a specified heating delay.

2-1/2

3-1/2

4.8

4.7

If at any time a call for both heating and cooling are present,

the heating operation will be performed. If operating, the cool-

ing system is halted as with a completion of a call for cooling.

Heating always takes priority.

3-1/2

4-1/2

4.6

4.5

4-1/2

5-1/2

4.4

4.3

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035-17311-003-A-0704

pleted. The UCB energizes the blower motor (if the fan switch

on the room thermostat is set in the "AUTO" position) and

drives the economizer dampers from fully closed to their min-

imum position. If the enthalpy of the outdoor air is below the

set point of the enthalpy controller (previously determined),

"Y1" energizes the economizer. The dampers will modulate to

maintain a constant supply air temperature as monitored by

the discharge air sensor. If the outdoor air enthalpy is above

the set point, "Y1" energizes compressor #1.

COOLING SEQUENCE OF OPERATION

CONTINUOUS BLOWER

By setting the room thermostat fan switch to "ON," the supply

air blower will operate continuously.

INTERMITTENT BLOWER

With the room thermostat fan switch set to "AUTO" and the

system switch set to either the "AUTO" or "HEAT" settings,

the blower is energized whenever a cooling or heating opera-

tion is requested. The blower is energized after any specified

delay associated with the operation.

When the thermostat calls for "second-stage" cooling, the low

voltage control circuit from "R" to "Y2" is completed. The UCB

energizes the first available compressor. If the enthalpy of the

outdoor air is below the set point of the enthalpy controller

(i.e. first stage has energized the economizer), "Y2" will ener-

gize compressor #1. If the outdoor air is above the set point,

"Y2" will energize compressor #2.

When energized, the indoor blower has a minimum run time

of 30 seconds. Additionally, the indoor blower has a delay of

10 seconds between operations.

Once the thermostat has been satisfied, it will de-energize

“Y1” and “Y2”. If the compressors have satisfied their mini-

mum run times, the compressors and condenser fans are de-

energized. Otherwise, the unit operates each cooling system

until the minimum run times for the compressors have been

completed. Upon the final compressor de-energizing, the

blower is stopped following the elapse of the fan off delay for

cooling, and the economizer damper goes to the closed posi-

tion. If the unit is in continues fan operation, the economizer

damper goes to the minimum position.

NO OUTDOOR AIR OPTIONS

When the thermostat calls for the first stage of cooling, the

low-voltage control circuit from “R” to “Y1” and “G” is com-

pleted. The UCB energizes the economizer (if installed and

free cooling is available) or the first available compressor^*

and the condenser fans. For first stage cooling, compressor

#1 is energized. If compressor #1 is unavailable, compressor

#2 is energized. After completing the specified fan on delay

for cooling, the UCB will energize the blower motor.

ECONOMIZER WITH DUAL ENTHALPY SENSORS -

When the thermostat calls for the second stage of cooling,

the low-voltage control circuit from “R” to “Y2” is completed.

The control board energizes the first available compressor. If

free cooling is being used for the first stage of cooling, com-

pressor #1 is energized. If compressor #1 is active for first

stage cooling or the first compressor is locked-out, compres-

sor #2 is energized. In free-cooling mode, if the call for the

second stage of cooling continues for 20 minutes, compres-

sor #2 is energized, provided it has not been locked-out.

The operation with the dual enthalpy sensors is identical to

the single sensor except that a second enthalpy sensor is

mounted in the return air. This return air sensor allows the

economizer to choose between outdoor air and return air,

whichever has the lowest enthalpy value, to provide maxi-

mum operating efficiency.

ECONOMIZER WITH POWER EXHAUST -

A unit equipped with an economizer (single or dual enthalpy)

and a power exhaust operates as specified above with one

addition. The power exhaust motor is energized 45 seconds

after the actuator position exceeds the exhaust fan set point

on the economizer control. When the power exhaust is oper-

ating, the second stage of mechanical cooling will not oper-

ate. As always, the "R" to "G" connection provides minimum

position but does not provide power exhaust operation.

If there is an initial call for both stages of cooling, the UCB will

delay energizing compressor #2 by 30 seconds in order to

avoid a power rush.

Once the thermostat has been satisfied, it will de-energize Y1

and Y2. If the compressors have satisfied their minimum run

times, the compressors and condenser fans are de-ener-

gized. Otherwise, the unit operates each cooling system until

the minimum run times for the compressors have been com-

pleted. Upon the final compressor de-energizing, the blower

is stopped following the elapse of the fan off delay for cooling.

MOTORIZED OUTDOOR AIR DAMPERS -

This system operation is the same as the units with no out-

door air options with one exception. When the "R" to "G" cir-

cuit is complete, the motorized damper drives open to a

position set by the thumbwheel on the damper motor. When

the "R" to "G" circuit is opened, the damper spring returns

fully closed.

* To be available, a compressor must not be locked-out due

to a high or low-pressure switch or freezestat trip and the

Anti-Short Cycle Delay (ASCD) must have elapsed.

ECONOMIZER WITH SINGLE ENTHALPY SENSOR -

When the room thermostat calls for "first-stage" cooling, the

low voltage control circuit from "R" to "G" and "Y1" is com-

Unitary Products Group

035-17311-003-A-0704

COOLING OPERATION ERRORS

LOW AMBIENT COOLING

To determine when to operate in low ambient mode, the UCB

has a pair of terminals connected to a temperature-activated

switch set at 45ºF. When the low ambient switch is closed

and the thermostat is calling for cooling, the UCB will operate

in the low ambient mode.

Each cooling system is monitored for operation outside of the

intended parameters. Errors are handled as described below.

All system errors override minimum run times for compres-

sors.

HIGH-PRESSURE LIMIT SWITCH

Low ambient mode operates the compressors in this manner:

10 minutes on, 5 minutes off. The indoor blower is operated

throughout the cycle. The 5-minute off period is necessary to

defrost the indoor coil.

During cooling operation, if a high-pressure limit switch

opens, the UCB will de-energize the associated compressor,

initiate the ASCD (Anti-short cycle delay), and, if the other

compressor is idle, stop the condenser fans. If the call for

cooling is still present at the conclusion of the ASCD, the

UCB will re-energize the halted compressor.

Low ambient mode always begins with compressor opera-

tion. Compressor minimum run time may extend the minutes

of compressor operation. The defrost cycle will begin immedi-

ately following the elapse of the minimum run time.

Should a high-pressure switch open three times within two

hours of operation, the UCB will lock-out the associated com-

pressor and flash a code (see 37). If the other compressor is

inactive, the condenser fans will be de-energized.

When operating in low ambient mode, the UCB will not lock-

out the compressors due to a freezestat trip. However, a

freezestat trip will de-energize the associated compressor. If

the call for cooling is still present at the end of the ASCD and

the freezestat has closed, the unit will resume operation.

LOW-PRESSURE LIMIT SWITCH

The low-pressure limit switch is not monitored during the ini-

tial 30 seconds of a cooling system's operation. For the fol-

lowing 30 seconds, the UCB will monitor the low-pressure

switch to ensure it closes. If the low-pressure switch fails to

close after the 30-second monitoring phase, the UCB will de-

energize the associated compressor, initiate the ASCD, and,

if the other compressor is idle, stop the condenser fans.

SAFETY CONTROLS

The unit control board monitors the following inputs for each

cooling system:

1. A suction line freezestat to protect against low evapora-

tor temperatures due to a low airflow or a low return air

temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).

Once the low-pressure switch has been proven (closed dur-

ing the 30-second monitor period described above), the UCB

will monitor the low-pressure limit switch for any openings. If

the low-pressure switch opens for greater than 5 seconds,

the UCB will de-energize the associated compressor, initiate

the ASCD, and, if the other compressor is idle, stop the con-

denser fans.

2. A high-pressure switch to protect against excessive dis-

charge pressures due to a blocked condenser coil or a

condenser motor failure, (opens at 405 ± 10 psig or 440

± 10 psig depending on unit model).

3. A low-pressure switch to protect against loss of refriger-

ant charge, (opens at 7 ± 3 psig or 22 ± 5 psig).

If the call for cooling is still present at the conclusion of the

ASCD, the UCB will re-energize the halted compressor.

The above pressure switches are hard-soldered to the unit.

The refrigeration systems are independently monitored and

controlled. On any fault, only the associated system will be

affected by any safety/preventive action. The other refrigerant

system will continue in operation unless it is affected by the

fault as well.

Should a low-pressure switch open three times within one

hour of operation, the UCB will lock-out the associated com-

pressor and flash a code (37). If the other compressor is inac-

tive, the condenser fans will be de-energized.

The unit control board monitors the temperature limit switch

of electric heat units and the temperature limit switch and the

gas valve of gas furnace units.

FREEZESTAT

During cooling operation, if a freezestat opens, the UCB will

de-energize the associated compressor, initiate the ASCD,

and, if the other compressor is idle, stop the condenser fans.

If the call for cooling is still present at the conclusion of the

ASCD, the UCB will re-energize the halted compressor.

COMPRESSOR PROTECTION

In addition to the external pressure snitches, the compres-

sors also have inherent (internal) protection. If there is an

abnormal temperature rise in a compressor, the protector will

open to shut down the compressor. The UCB incorporates

features to minimize compressor wear and damage. An Anti-

Short Cycle Delay (ASCD) is utilized to prevent operation of

Should a freezestat open three times within two hours of

operation, the UCB will lock-out the associated compressor

and flash a code (37). If the other compressor is inactive, the

condenser fans will be de-energized.

Unitary Products Group

035-17311-003-A-0704

a compressor too soon after its previous run. Additionally, a

minimum run time is imposed any time a compressor is ener-

gized.

Limit Setting Table 32. It resets automatically. The limit switch

operates when a high temperature condition, caused by inad-

equate supply air flow occurs, thus shutting down the heater

and energizing the blower.

The ASCD is initiated on unit start-up and on any compressor

reset or lock-out.

TABLE 32: ELECTRIC HEAT LIMIT SETTING

FLASH CODES

LIMIT

UNIT (TONS)

VOLTAGE

HEATER kW

SWITCH

OPENS °F

The UCB will initiate a flash code associated with errors

within the system. Refer to UNIT CONTROL BOARD FLASH

CODES 37.

7.5

150

130

RESET

7.5, 10, 12.5

10, 12.5

Remove the call for cooling, by raising thermostat setting

higher than the conditioned space temperature. This resets

any pressure or freezestat flash codes.

380

ELECTRIC HEATING SEQUENCE OF OPERATIONS

The following sequence describes the operation of the elec-

tric heat section.

FLASH CODES

The UCB will initiate a flash code associated with errors

within the system. Refer to UNIT CONTROL BOARD FLASH

CODES Table 37.

Two-stage heating:

a. Upon a call for first stage heat by the thermostat, the

heater relay (RA) will be energized. After completing

the specified fan on delay for heating, the UCB will

energize the blower motor. If the second stage of

heat is required, heater relay (RB) will be energized.

After completing the specified fan on delay for heat-

ing, the UCB will energize the blower motor.

RESET

Remove the call for heating by lowering the thermostat set-

ting lower than the conditioned space temperature.This

resets any flash codes.

ELECTRIC HEAT ANTICTPATOR SETPOINTS

b. The thermostat will cycle the electric heat to satisfy

the heating requirements of the conditioned space.

It is important that the anticipator setpoint be correct. Too

high of a setting will result in longer heat cycles and a greater

temperature swing in the conditioned space. Reducing the

value below the correct setpoint will give shorter “ON” cycles

and may result in the lowering of the temperature within the

conditioned space. Refer to Table 33 for the required electric

heat anticipator setting.

ELECTRIC HEATING OPERATION ERRORS

TEMPERATURE LIMIT

If the UCB senses zero volts from the high temperature limit,

the indoor blower motor is immediately energized.

TABLE 33: ELECTRIC HEAT ANTICIPATOR

SETPOINTS

This limit is monitored regardless of unit operation status, i.e.

the limit is monitored at all times.

SETTING, AMPS

If the temperature limit opens three times within one hour, it

will lock-on the indoor blower motor and a flash code is initi-

ated (See Table 37).

0.13

0.1

SAFETY CONTROLS

The UCB monitors the temperature limit switch of electric

heat units.

The control circuit includes the following safety controls:

LIMIT SWITCH (LS)

This control is located inside the heater compartment and is

set to open at the temperature indicated in the Electric Heat

Unitary Products Group

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OPERATING INSTRUCTIONS

START-UP (COOLING)

1. Turn unit electrical power on.

PRESTART CHECK LIST

NOTE: Prior to each cooling season, the crankcase heaters

must be energized at least 10 hours before the sys-

tem is put into operation.

After installation has been completed:

1. Check the electrical supply voltage being supplied. Be

sure that it is the same as listed on the unit nameplate.

2. Set the room thermostat setting to lower than the room

temperature.

2. Set the room thermostat to the off position.

3. Turn unit electrical power on.

3. First stage compressors will energize after the built-in

time delay (five minutes).

4. The second stage of the thermostat will energize second

stage compressor if needed.

4. Set the room thermostat fan switch to on.

5. Check indoor blower rotation.

POST START CHECK LIST

1. Verify proper system pressures for both circuits.

•

If blower rotation is in the wrong direction. Refer to

Phasing Section in general information section.

2. Measure the temperature drop across the evaporator

coil.

Check blower drive belt tension.

CHARGING THE UNIT

These units should be charged using the superheat method.

Super heat charging data is shown in Tables 34 thru 36.

6. Check the unit supply air (CFM).

7. Measure evaporator fan motor's amp draw.

8. Set the room thermostat fan switch to off.

9. Turn unit electrical power off.

When charging each system, superheat data should be taken

at the compressor inlet.

TABLE 34: 7.5 TON STANDARD EFFICIENCY SUPERHEAT CHARGING

Superheat at Compressor Suction (°F)

Airflow = 3000 CFM

Outdoor

Temp (°F)

Indoor WB Temp (°F)

16.3

13.8

11.3

8.9

6.4

5.8

5.3

19.1

16.5

13.9

11.4

8.8

7.9

7.1

6.3

5.5

24.8

22.0

19.2

16.3

13.5

12.2

10.8

9.0

10.6

13.5

22.0

19.3

16.6

13.9

11.1

10.1

9.0

27.7

24.7

21.8

18.8

15.9

14.3

12.7

10.4

8.1

29.1

26.5

24.0

21.4

18.9

17.2

15.6

13.5

11.4

9.3

30.5

28.4

26.2

24.0

21.9

20.2

18.5

16.6

14.6

12.7

10.8

32.0

30.2

28.4

26.6

24.8

23.1

21.5

19.7

17.9

16.1

14.3

33.4

32.0

30.6

29.2

27.8

26.1

24.4

22.8

21.2

19.5

17.9

8.4

11.1

6.1

8.7

6.4

100

105

110

115

7.7

6.4

7.3

5.1

5.5

5.9

7.2

Unitary Products Group

035-17311-003-A-0704

TABLE 35: 10 TON STANDARD EFFICIENCY SUPERHEAT CHARGING

Superheat at Compressor Suction (°F)

Airflow = 4000 CFM

Outdoor

Temp (°F)

Indoor WB Temp (°F)

23.2

19.0

14.7

10.5

6.3

5.6

25.6

22.0

18.4

14.8

11.1

9.9

8.7

6.7

28.4

25.4

22.4

19.5

16.5

15.0

13.4

10.8

8.1

19.6

20.8

22.0

24.4

20.5

16.6

12.6

8.7

7.8

6.8

5.3

26.9

23.5

20.2

16.9

13.6

12.0

10.5

8.1

29.9

27.3

24.7

22.0

19.4

17.9

16.3

13.5

10.6

7.7

31.4

29.2

26.9

24.6

22.4

20.8

19.3

16.2

13.1

10.0

6.9

32.9

31.0

29.1

27.2

25.3

23.7

22.2

18.9

15.5

12.2

8.9

14.4

16.0

17.5

9.3

11.1

12.9

6.3

8.4

100

105

110

115

5.7

5.5

TABLE 36: 12.5 TON STANDARD EFFICIENCY SUPERHEAT CHARGING

Superheat at Compressor Suction (°F)

Airflow = 5000 CFM

Outdoor

Temp (°F)

Indoor WB Temp (°F)

33.9

30.2

26.4

23.5

20.6

17.2

13.8

9.9

34.5

31.0

27.5

24.7

22.0

18.8

15.5

11.8

8.0

35.1

31.8

28.6

26.0

23.4

20.3

17.2

13.6

10.0

8.2

35.7

32.7

29.6

27.2

24.8

21.9

19.0

15.5

12.0

9.8

36.3

33.5

30.7

28.4

26.2

23.5

20.7

17.4

14.0

11.5

9.0

36.9

34.3

31.8

29.7

27.6

25.0

22.4

19.2

16.0

13.2

10.3

37.5

35.2

32.8

30.9

29.0

26.6

24.2

21.1

18.0

14.8

11.7

38.1

36.0

33.9

32.1

30.4

28.2

25.9

23.0

20.0

16.5

13.0

38.7

36.8

35.0

33.4

31.8

29.7

27.6

24.8

22.0

18.2

14.3

39.3

37.7

36.0

34.6

33.2

31.3

29.4

26.7

24.0

19.8

15.7

39.9

38.5

37.1

35.8

34.6

32.9

31.1

28.6

26.0

21.5

17.0

100

105

110

115

6.0

4.8

6.5

3.7

5.0

6.3

7.7

Unitary Products Group

035-17311-003-A-0704

NORMAL MAINTENANCE

TROUBLESHOOTING

Troubleshooting of components may require open-

ing the electrical control box with the power con-

nected to the unit. Use extreme care when

working with live circuits! Check the unit name-

plate for the correct line voltage and set the voltme-

ter to the correct range before making any

connections with line terminals.

Prior to any of the following maintenance proce-

dures, shut off all power to the unit to prevent per-

sonal injury.

Periodic maintenance normally consists of chang-

ing or cleaning filters.

When not necessary, shut off all electric power to the

unit prior to any of the following maintenance proce-

dures so as to prevent personal injury.

GENERAL

FILTERS

Inspect once a month. Replace disposable or clean perma-

nent type as necessary. DO NOT replace permanent type

with disposable.

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and dan-

gerous operation which could cause injury to person

and/or damage unit components. Verify proper oper-

ation after servicing.

MOTORS

Indoor fan and outdoor fan motors are permanently lubricated

and require no maintenance.

OUTDOOR COIL

Dirt should not be allowed to accumulate on the outdoor coil

surface or other parts in the air circuit. Cleaning should be as

often as necessary to keep coil clean. Use a brush, vacuum

cleaner attachment, or other suitable means. If water is used

to clean coil, be sure power to the unit is shut off prior to

cleaning. Service access is provided in the front and rear

condenser compartment panels to provide improved access

PREDATOR^®FLASH CODES

Various flash codes are utilized by the unit control board

(UCB) to aid troubleshooting. Flash codes are distinguished

by the short on and off cycle used (approximately 200ms on

and 200ms off). To show normal operation, the control board

flashes a 1 second on, 1 second off “heartbeat” during normal

operation. This is to verify that the UCB is functioning cor-

rectly. Do not confuse this with an error flash code. To prevent

confusion, a 1-flash, flash code is not used.

to the condenser coils.

Current alarms are flashed on the UCB LED. The alarm his-

tory can be checked by pressing and releasing the ALARMS

button on the UCB. The UCB will cycle through the last five

(5) alarms, most recent to oldest, separating each alarm flash

code by approximately 2 seconds.

Do not remove service panels or attempt to clean

the interior of the condenser section when the unit

is powered and/or operating. Shut off all power to

the unit prior to cleaning or maintenance of the

condenser section internals.

In some cases, it may be necessary to “zero” the ASCD for

the compressors in order to perform troubleshooting. To reset

all ASCDs for one cycle, press and release the UCB TEST

button once.

NOTE: Exercise care when cleaning the coil so that the coil

fins are not damaged. Do not permit the outdoor air

discharge to be obstructed by overhanging struc-

tures of shrubs.

Unitary Products Group

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TABLE 37: UNIT CONTROL BOARD FLASH CODES

Flash Code

Description

On Steady

Heart Beat

1 Flash

Control Failure - Replace Control

Normal Operation

Not Applicable

2 Flashes

3 Flashes

4 Flashes

5 Flashes

6 Flashes

7 Flashes

8 Flashes

Control waiting ASCD

HPS1 - Compressor Lock out

HPS2 - Compressor Lock out

LPS1 - Compressor Lock out

LPS2 - Compressor Lock out

FS1 - Compressor Lock out

FS2 - Compressor Lock out

Ignition Control Locked Out/

9 Flashes

10 Flashes

11 Flashes

Ignition Control Failure / Limit Switch Trip / No Jumper Plug in Heat Section

Compressors Locked Out On Low

Outdoor Air Temperature

Compressors Locked Out Because The

Economizer Is Using Free Cooling

12 Flashes

13 Flashes

14 Flashes

OFF

Fan Overload Switch Trip - Not Applicable On This Unit *

Compressor Held Off Due To Low Voltage*

EEPROM Storage Failure (Control Failure)

No Power or Control Failure

These flash codes do not represent alarms.

Monitored

Loss of

Call for

Heating?

Yes

Call for

Heating?

Systems

Programming?

Yes

Heat Off

Problem?

Yes

Program

Unit

Control

Board

Call for 2nd

Stage

Cooling

Call for

Heat

Trip/Failure

Yes

Energize ID

Call for

First

Monitor

Blower Motor

Cooling?

Stage?

Yes

Call for 1st

Stage

Cooling

Yes

Turn off ID

Blower Motor

Fan on

>30 secs?

Fan off

>10 secs?

Yes

Lossof Call

for ID Blower?

Call for

ID Blower?

Loss of Call

for Cooling?

Cool Off

FIGURE 24 - BASIC TROUBLESHOOTING FLOWCHART

Unitary Products Group

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On calls for cooling, the supply air blower motor is operating

but compressor #1 is not (the room thermostat fan switch is in

the “AUTO” position):

COOLING TROUBLESHOOTING GUIDE

On calls for cooling, if the compressors are operating but the

supply air blower motor does not energize after a short delay

(the room thermostat fan switch is in the “AUTO” position):

1. If installed, check the position of the economizer blades.

If the blades are open, the economizer is providing free

cooling and the compressors will not immediately oper-

ate. If both stages of cooling are requested simulta-

neously and the economizer provides free cooling,

following a short delay compressor #1 will be energized

unless it is locked out. If compressor #1 is locked out,

compressor #2 is energized. Compressor #2 is always

energized in place of compressor #1 when compressor

#1 is requested but locked out.

1. Turn the thermostat fan switch to the ON position. If the

supply air blower motor does not energize, go to Step 3.

2. If the blower motor runs with the fan switch in the ON

position but will not run after the first compressor has

energized when the fan switch is in the AUTO position,

check the room thermostat for contact between R and G

in the AUTO position during calls for cooling.

3. If the supply air blower motor does not energize when

the fan switch is set to ON, check that line voltage is

being supplied to the contacts of the M3, contactor, and

that the contactor is pulled in. Check for loose wiring

between the contactor and the supply air blower motor.

2. If no economizer is installed or the economizer is not

opening to provide free cooling and compressor #1 does

not energize on a call for cooling, check for line voltage

at the compressor contactor, M1, and that the contactor

is pulled in. Check for loose wiring between the contac-

tor and the compressor.

4. If M3 is pulled in and voltage is supplied to M3, lightly

touch the supply air blower motor housing. If it is hot, the

motor may be off on internal protection. Cancel any

thermostat calls and set the fan switch to AUTO. Wait for

the internal overload to reset. Test again when cool.

3. If M1 is pulled in and voltage is supplied at M1, lightly

touch the compressor housing. If it is hot, the compres-

sor may be off on inherent protection. Cancel any calls

for cooling and wait for the internal overload to reset.

Test again when cool.

5. If M3 is not pulled in, check for 24 volts at the M3 coil. If

24 volts are present at M3 but M3 is not pulled in,

replace the contactor.

4. If M1 is not pulled in, check for 24 volts at the M1 coil. If

24 volts are present and M1 is not pulled in, replace the

contactor.

6. Failing the above, if there is line voltage supplied at M3,

M3 is pulled in, and the supply air blower motor still does

not operate, replace the motor.

5. Failing the above, if voltage is supplied at M1, M1 is

pulled in, and the compressor still does not operate,

replace the compressor.

7. If 24 volts is not present at M3, check that 24 volts is

present at the UCB supply air blower motor terminal,

“FAN”. If 24 volts is present at the FAN, check for loose

wiring between the UCB and M3.

6. If 24 volts is not present at M1, check for 24 volts at the

UCB terminal, C1. If 24 volts is present, check for loose

wiring between C1 and the compressor contactor.

8. If 24 volts is not present at the “FAN” terminal, check for

24 volts from the room thermostat. If 24 volts are not

present from the room thermostat, check for the follow-

ing:

7. If 24 volts is not present at the C1 terminal, check for 24

volts from the room thermostat at the UCB Y1 terminal.

If 24 volts is not present from the room thermostat, check

for the following:

a. Proper operation of the room thermostat (contact

between R and G with the fan switch in the ON posi-

tion and in the AUTO position during operation

calls).

a. 24 volts at the thermostat Y1 terminal

b. Proper wiring between the room thermostat and the

UCB, i.e. Y1 to Y1, Y2 to Y2, and

b. Proper wiring between the room thermostat and the

UCB, and

c. Loose wiring from the room thermostat to the UCB

8. If 24 volts is present at the UCB Y1 terminal, the com-

pressor may be out due to an open high-pressure switch,

low-pressure switch, or freezestat. Check for 24 volts at

the HPS1, LPS1, and FS1 terminals of the UCB. If a

switch has opened, there should be a voltage potential

between the UCB terminals, e.g. if LPS1 has opened,

there will be a 24-volt potential between the LPS1 termi-

nals.

c. Loose wiring from the room thermostat to the UCB

9. If 24 volts is present at the room thermostat but not at the

UCB, check for proper wiring between the thermostat

and the UCB, i.e. that the thermostat G terminal is con-

nected to the G terminal of the UCB, and for loose wir-

ing.

10. If the thermostat and UCB are properly wired, replace

the UCB.

9. If 24 volts is present at the UCB Y1 terminal and none of

the protection switches have opened, the UCB may have

Unitary Products Group

035-17311-003-A-0704

locked out the compressor for repeat trips. The UCB

should be flashing an alarm code. If not, press and

release the ALARMS button on the UCB. The UCB will

flash the last five alarms on the LED. If the compressor

is locked out, cancel any call for cooling. This will reset

any compressor lock outs.

16. If none of the above correct the error, replace the UCB.

On calls for the second stage of cooling, the supply air blower

motor and compressor #1 are operating but compressor #2 is

not (the room thermostat fan switch is in the “AUTO” posi-

tion):

NOTE: While the above step will reset any lockouts, com-

pressor #1 may be held off for the ASCD. See the

next step.

1. If installed, check the position of the economizer blades.

If the blades are open, the economizer is providing free

cooling. If the second stage of cooling is requested, fol-

lowing a short delay, compressor #1 will be energized

unless it is locked out. Typically, compressor #2 is ener-

gized only during free cooling if the call for the second

stage of cooling persists for 20 minutes.

10. If 24 volts is present at the UCB Y1 terminal and none of

the switches are open and the compressor is not locked

out, the UCB may have the compressor in an ASCD.

Check the LED for an indication of an ASCD cycle. The

ASCD should time out within 5 minutes. Press and

release the TEST button to reset all ASCDs.

2. Compressor #2 will not energize simultaneously with

compressor #1 if a call for both stages of cooling is

received. The UCB delays compressor #2 by 30 sec-

onds to prevent a power surge. If after the delay com-

pressor #2 does not energize on a second stage call for

cooling, check for line voltage at the compressor contac-

tor, M2, and that the contactor is pulled in. Check for

loose wiring between the contactor and the compressor.

11. If 24 volts is present at the UCB Y1 terminal and the

compressor is not out due to a protective switch trip,

repeat trip lock out, or ASCD, the economizer terminals

of the UCB may be improperly wired. Check for 24 volts

at the Y1 “OUT” terminal of the UCB. If 24 volts is

present, trace the wiring from Y1 “OUT” for incorrect wir-

ing. If 24 volts is not present at the Y1 “OUT” terminal,

the UCB must be replaced.

3. If M2 is pulled in and voltage is supplied at M2, lightly

touch the compressor housing. If it is hot, the compres-

sor may be off on inherent protection. Cancel any calls

for cooling and wait for the internal overload to reset.

Test again when cool.

12. For units without economizers: If 24 volts is present at

the Y1 OUT terminal, check for 24 volts at the Y1

“ECON” terminal. If 24 volts is not present, check for

loose wiring from the Y1 “OUT” terminal to the Mate-N-

Lock plug, the jumper in the Mate-N-Lock plug, and in

the wiring from the Mate-N-Lock plug to the Y1 “ECON”

terminal.

4. If M2 is not pulled in, check for 24 volts at the M2 coil. If

24 volts is present and M2 is not pulled in, replace the

contactor.

5. Failing the above, if voltage is supplied at M2, M2 is

pulled in, and the compressor still does not operate,

replace the compressor.

13. For units with economizers: If 24 volts is present at the

Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON”

terminal. If 24 volts is not present, check for loose wiring

from the Y1 “OUT” terminal to the Mate-N-Lock plug, a

poor connection between the UCB and economizer

Mate-N-Lock plugs, loose wiring from the Mate-N-Lock

plug to the economizer, back to the Mate-N-Lock plug,

and from the Mate-N-Lock plug to the Y1 “ECON” termi-

nal. If nothing is found, the economizer control may have

faulted and is failing to return the 24-volt “call” to the Y1

“ECON” terminal even though the economizer is not pro-

viding free cooling. To test, disconnect the Mate-N-Locks

and jumper between the WHITE and YELLOW wires of

the UCB’s Mate-N-Lock plug. If compressor #1 ener-

gizes, there is a fault in the economizer wiring or the

economizer control.

6. If 24 volts is not present at M2, check for 24 volts at the

UCB terminal, C2. If 24 volts are present, check for

loose wiring between C2 and the compressor contactor.

7. If 24 volts is not present at the C2 terminal, check for 24

volts from the room thermostat at the UCB Y2 terminal.

If 24 volts is not present from the room thermostat, check

for the following:

a. 24 volts at the thermostat Y2 terminal

b. Proper wiring between the room thermostat and the

UCB, i.e. Y1 to Y1, Y2 to Y2, and

c. Loose wiring from the room thermostat to the UCB

8. If 24 volts is present at the UCB Y2 terminal, the com-

pressor may be out due to an open high-pressure switch,

low-pressure switch, or freezestat. Check for 24 volts at

the HPS2, LPS2, and FS2 terminals of the UCB. If a

switch has opened, there should be a voltage potential

between the UCB terminals, e.g. if LPS2 has opened,

there will be 24 volts of potential between the LPS2 ter-

minals.

14. The UCB can be programmed to lock out compressor

operation during free cooling and in low ambient condi-

tions. These options are not enabled by default. Local

York distributors can test the UCB for this programming.

15. If none of the above corrected the error, test the integrity

of the UCB. Disconnect the C1 terminal wire and jumper

it to the Y1 terminal. DO NOT jump the Y1 to C1 termi-

nals. If the compressor engages, the UCB has faulted.

Unitary Products Group

035-17311-003-A-0704

9. If 24 volts is present at the UCB Y2 terminal and none of

the protection switches have opened, the UCB may have

locked out the compressor for repeat trips. The UCB

should be flashing a code. If not, press and release the

ALARMS button on the UCB. The UCB will flash the last

five alarms on the LED. If the compressor is locked out,

6. If 24 volts is not present at M1, check for 24 volts at the

UCB terminal, C1. If 24 volts is present, check for loose

wiring between C1 and the compressor contactor.

7. If 24 volts is not present at the C1 terminal, check for 24

volts from the room thermostat at the UCB Y1 terminal.

If 24 volts are not present at the UCB Y1 terminal, the

UCB may have faulted. Check for 24 volts at the Y1

ECON terminal. If 24 volts is not present at Y1 “ECON”,

the UCB has faulted. The UCB should de-energize all

compressors on a loss of call for the first stage of cool-

ing, i.e. a loss if 24 volts at the Y1 terminal.

remove any call for cooling at the thermostat or by dis-

connecting the thermostat wiring at the Y2 UCB terminal.

This will reset any compressor lock outs.

NOTE: While the above step will reset any lock outs, com-

pressor #1 will be held off for the ASCD, and com-

pressor #2 may be held off for a portion of the

ASCD. See the next step.

8. If 24 volts are present at the UCB Y1 terminal, the com-

pressor may be out due to an open high-pressure switch,

low-pressure switch, or freezestat. Check for 24 volts at

the HPS1, LPS1, and FS1 terminals of the UCB. If a

switch has opened, there should be a voltage potential

between the UCB terminals, e.g. if LPS1 has opened,

there will be a 24-volt potential between the LPS1 termi-

nals.

10. If 24 volts is present at the UCB Y2 terminal and none of

the switches are open and the compressor is not locked

out, the UCB may have the compressor in an ASCD.

Check the LED for an indication of an ASCD cycle. The

ASCD should time out within 5 minutes. Press and

release the TEST button to reset all ASCDs.

9. If 24 volts is present at the UCB Y1 terminal and none of

the protection switches have opened, the UCB may have

locked out the compressor for repeat trips. The UCB

should be flashing a code. If not, press and release the

ALARMS button on the UCB. The UCB will flash the last

five alarms on the LED. If the compressor is locked out,

remove any call for cooling. This will reset any compres-

sor lock outs.

11. The UCB can be programmed to lock out compressor

operation during free cooling and in low ambient condi-

tions. These options are not enabled by default. Local

York distributors can test the UCB for this programming.

12. If none of the above corrected the error, test the integrity

of the UCB. Disconnect the C2 terminal wire and jumper

it to the Y2 terminal. DO NOT jump the Y2 to C2 termi-

nals. If the compressor engages, the UCB has faulted.

NOTE: While the above step will reset any lock outs, com-

pressor #2 will be held off for the ASCD, and com-

pressor #1 may be held off for a portion of the

ASCD. See the next step.

13. If none of the above correct the error, replace the UCB.

On a call for cooling, the supply air blower motor and com-

pressor #2 are operating but compressor #1 is not (the room

thermostat fan switch is in the “AUTO” position):

10. If 24 volts is present at the UCB Y1 terminal and none of

the switches are open and the compressor is not locked

out, the UCB may have the compressor in an ASCD.

Check the LED for an indication of an ASCD cycle. The

ASCD should time out within 5 minutes. Press and

release the TEST button to reset all ASCDs.

1. Compressor #2 is energized in place of compressor #1

when compressor #1 is unavailable for cooling calls.

Check the UCB for alarms indicating that compressor #1

is locked out. Press and release the ALARMS button if

the LED is not flashing an alarm.

11. If 24 volts is present at the UCB Y1 terminal and the

compressor is not out due to a protective switch trip,

repeat trip lock out, or ASCD, the economizer terminals

of the UCB may be improperly wired. Check for 24 volts

at the Y1 “OUT” terminal of the UCB. If 24 volts is

present, trace the wiring from Y1 “OUT” for incorrect wir-

ing. If 24 volts is not present at the Y1 “OUT” terminal,

the UCB must be replaced.

2. Check for line voltage at the compressor contactor, M1,

and that the contactor is pulled in. Check for loose wiring

between the contactor and the compressor.

3. If M1 is pulled in and voltage is supplied at M1, lightly

touch the compressor housing. If it is hot, the compres-

sor may be off on inherent protection. Cancel any calls

for cooling and wait for the internal overload to reset.

Test again when cool.

12. For units without economizers: If 24 volts is present at

the Y1 “OUT” terminal, check for 24 volts at the Y1

“ECON” terminal. If 24 volts is not present, check for

loose wiring from the Y1 “OUT” terminal to the Mate-N-

Lock plug, the jumper in the Mate-N-Lock plug, and in

the wiring from the Mate-N-Lock plug to the Y1 “ECON”

terminal.

4. If M1 is not pulled in, check for 24 volts at the M1 coil. If

24 volts is present and M1 is not pulled in, replace the

contactor.

5. Failing the above, if voltage is supplied at M1, M1 is

pulled in, and the compressor still does not operate,

replace the compressor.

For units with economizers:If 24 volts is present at the

Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON”

Unitary Products Group

terminal. If 24 volts is not present, check for loose wiring

from the Y1 “OUT” terminal to the Mate-N-Lock plug, a

poor connection between the UCB and economizer

Mate-N-Lock plugs, loose wiring from the Mate-N-Lock

plug to the economizer, back to the Mate-N-Lock plug,

and from the Mate-N-Lock plug to the Y1 “ECON”

terminal. The economizer control may have faulted and

is not returning the 24 volts to the Y1 “ECON” terminal

even though the economizer is not providing free

cooling. To test the economizer control, disconnect the

Mate-N-Locks and jumper between the WHITE and

YELLOW wires of the UCB’s Mate-N-Lock plug.

13. The UCB can be programmed to lock out compressor

operation during free cooling and in low ambient condi-

tions. These options are not enabled by default. They

can be checked by local York distributors.

14. If none of the above corrected the error, test the integrity

of the UCB. Disconnect the C1 terminal wire and jumper

it to the Y1 terminal. DO NOT jump the Y1 to C1 termi-

nals. If the compressor engages, the UCB has faulted.

15. If none of the above correct the error, replace the UCB.

Subject to change without notice. Printed in U.S.A.

035-17311-003-A-0704

Supersedes: 035-17311-002-A-0803

Unitary

Products

Group

5005

York

Drive

Norman

73069

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