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INSTALLATION
MANUAL
®
SINGLE PACKAGE AIR CONDITIONERS AND
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . .5
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
REFERENCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
SINGLE PACKAGE ELECTRIC UNITS
DM090, 120 and 150
7-1/2 TO 12-1/2 TON
(380V, 3 Phase, 60 HZ)
APPROVALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
START-UP (COOLING). . . . . . . . . . . . . . . . . . . . . . . . . .37
NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . .39
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . .39
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
035-17311-003-A-0704
035-17311-003-A-0704
TABLE OF CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
METHOD ONE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
METHOD TWO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 5
SUPPLY AIR DRIVE ADJUSTMENT . . . . . . . . . . . . . . . . . 32
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SEQUENCE OF OPERATIONS OVERVIEW . . . . . . . . . . . 33
COOLING SEQUENCE OF OPERATION . . . . . . . . . . . . . . 34
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
INSTALLATION SAFETY INFORMATION . . . . . . . . . . . . .
PRECEDING INSTALLATION . . . . . . . . . . . . . . . . . . . . . . .
LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RIGGING AND HANDLING . . . . . . . . . . . . . . . . . . . . . . . . .
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DUCT COVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSATE DRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THERMOSTAT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER AND CONTROL WIRING . . . . . . . . . . . . . . . . . . .
POWER WIRING DETAIL . . . . . . . . . . . . . . . . . . . . . . . . . .
OPTIONS/ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
10
11
11
12
15
15
16
16
16
17
17
17
21
ELECTRIC HEAT ACCESSORIES . . . . . . . . . . . . . . . . . . . . . 21
ELECTRIC HEAT OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
MOTORIZED OUTDOOR DAMPER . . . . . . . . . . . . . . . . . . . . 21
ECONOMIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
POWER EXHAUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
RAIN HOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
ECONOMIZER AND POWER EXHAUST SET POINT
ADJUSTMENTS AND INFORMATION . . . . . . . . . . . . . . . 22
MINIMUM POSITION ADJUSTMENT . . . . . . . . . . . . . . . . . . . 22
ENTHALPY SET POINT ADJUSTMENT . . . . . . . . . . . . . . . . . 22
POWER EXHAUST DAMPER SET POINT (WITH OR
WITHOUT POWER EXHAUST) . . . . . . . . . . . . . . . . . . . . . . . 22
INDOOR AIR QUALITY AQ . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PHASING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BLOWER ROTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AIR BALANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING AIR QUANTITY . . . . . . . . . . . . . . . . . . . . . . . .
2
24
24
24
31
31
CONTINUOUS BLOWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
INTERMITTENT BLOWER . . . . . . . . . . . . . . . . . . . . . . . . . . .34
NO OUTDOOR AIR OPTIONS . . . . . . . . . . . . . . . . . . . . . . . .34
ECONOMIZER WITH SINGLE ENTHALPY SENSOR - . . . . .34
ECONOMIZER WITH DUAL ENTHALPY SENSORS - . . . . . .34
ECONOMIZER WITH POWER EXHAUST - . . . . . . . . . . . . . .34
MOTORIZED OUTDOOR AIR DAMPERS - . . . . . . . . . . . . . .34
COOLING OPERATION ERRORS . . . . . . . . . . . . . . . . . . . . .35
HIGH-PRESSURE LIMIT SWITCH . . . . . . . . . . . . . . . . . . . . .35
LOW-PRESSURE LIMIT SWITCH . . . . . . . . . . . . . . . . . . . . . .35
FREEZESTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
LOW AMBIENT COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
COMPRESSOR PROTECTION . . . . . . . . . . . . . . . . . . . . . 35
FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
ELECTRIC HEATING SEQUENCE OF OPERATIONS . . . 36
ELECTRIC HEATING OPERATION ERRORS . . . . . . . . . . 36
TEMPERATURE LIMIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
LIMIT SWITCH (LS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
ELECTRIC HEAT ANTICTPATOR SETPOINTS . . . . . . . . . 36
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . . . 37
PRESTART CHECK LIST . . . . . . . . . . . . . . . . . . . . . . . . . . 37
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . 37
POST START CHECK LIST . . . . . . . . . . . . . . . . . . . . . . . . 37
CHARGING THE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . 39
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
OUTDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . . 39
PREDATOR® FLASH CODES . . . . . . . . . . . . . . . . . . . . . . 39
COOLING TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . 41
Unitary Products Group
035-17311-003-A-0704
LIST OF FIGURES
Fig. #
Pg.#
Fig. #
Pg.#
1
UNIT SHIPPING BRACKET . . . . . . . . . . . . . . . . . . . . 10
13 SIDE PANELS WITH HOLE PLUGS . . . . . . . . . . . . . 16
2
CONDENSER COVERING . . . . . . . . . . . . . . . . . . . . 10
14 RETURN DOWNFLOW PLENUM WITH PANEL . . . 16
3
COMPRESSOR SECTION . . . . . . . . . . . . . . . . . . . . . 10
15 DISCHARGE PANEL IN PLACE . . . . . . . . . . . . . . . . 16
4
PREDATOR® COMPONENT LOCATION . . . . . . . . . 11
16 CONDENSATE DRAIN . . . . . . . . . . . . . . . . . . . . . . . 16
5
UNIT 4 POINT LOAD . . . . . . . . . . . . . . . . . . . . . . . . . 12
17 ELECTRONIC THERMOSTAT FIELD WIRING . . . . 18
6
UNIT 6 POINT LOAD . . . . . . . . . . . . . . . . . . . . . . . . . 12
18 FIELD WIRING 24 VOLT THERMOSTAT . . . . . . . . . 18
7
UNIT CENTER OF GRAVITY . . . . . . . . . . . . . . . . . . . 12
19 FIELD WIRING DISCONNECT . . . . . . . . . . . . . . . . . 19
8
UNIT DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 13
20 ENTHALPY SET POINT CHART . . . . . . . . . . . . . . . . 23
9
BOTTOM DUCT OPENINGS (FROM ABOVE) . . . . . 14
21 HONEYWELL ECONOMIZER CONTROL W7212 . . 23
10 REAR DUCT DIMENSIONS . . . . . . . . . . . . . . . . . . . . 14
22 BELT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 24
11
PREDATOR®
ROOF CURB DIMENSIONS . . . . . . . . 15
23 DRY COIL DELTA P . . . . . . . . . . . . . . . . . . . . . . . . . 32
12 SUNLINE™ TO PREDATOR® TRANSITION ROOF
CURBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
24 BASIC TROUBLESHOOTING FLOWCHART . . . . . . 40
Unitary Products Group
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035-17311-003-A-0704
LIST OF TABLES
Tbl.#
Pg.#
1
UNIT VOLTAGE LIMITATIONS . . . . . . . . . . . . . . . . . 11
2
UNIT TEMPERATURE LIMITATIONS . . . . . . . . . . . . 11
3
UNIT WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
6 POINT LOAD WEIGHT . . . . . . . . . . . . . . . . . . . . . . 12
5
4 POINT LOAD WEIGHT . . . . . . . . . . . . . . . . . . . . . . 12
6
UNIT CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
CONTROL WIRE SIZES . . . . . . . . . . . . . . . . . . . . . . . 17
8
ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT
POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 19
9
ELECTRICAL DATA - DM090 (7-1/2 TON) WITH
POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 19
10 ELECTRICAL DATA - DM120 (10 TON) WITHOUT
POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20
11 ELECTRICAL DATA - DM120 (10 TON) WITH POWER
CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . . . . . 20
12 ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT
POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20
13 ELECTRICAL DATA - DM150 (12-1/2 TON) WITH
POWER CONVENIENCE OUTLET . . . . . . . . . . . . . . 20
Tbl.#
Pg.#
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
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 28
25 10 TON STANDARD MOTOR DOWN SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 29
26 10 TON OPTIONAL MOTOR DOWN SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 29
27 12-1/2 TON STANDARD MOTOR SIDE SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 30
28 12-1/2 TON OPTIONAL MOTOR SIDE SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 30
29 INDOOR BLOWER SPECIFICATIONS . . . . . . . . . . . 31
30 ADDITIONAL STATIC RESISTANCE . . . . . . . . . . . . 33
14 PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
31 MOTOR SHEAVE DATUM DIAMETERS . . . . . . . . . . 33
15 MINIMUM SUPPLY AIR CFM . . . . . . . . . . . . . . . . . . . 21
32 ELECTRIC HEAT LIMIT SETTING . . . . . . . . . . . . . . 36
16 SUPPLY AIR LIMITATIONS . . . . . . . . . . . . . . . . . . . . 24
33 ELECTRIC HEAT ANTICIPATOR SETPOINTS . . . . 36
17 7-1/2 TON STANDARD MOTOR DOWN SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 25
34 7.5 TON STANDARD EFFICIENCY SUPERHEAT
CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
18 7-1/2 TON OPTIONAL MOTOR DOWN SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 25
35 10 TON STANDARD EFFICIENCY SUPERHEAT
CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
19 10 TON STANDARD MOTOR DOWN SHOT
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 26
36 12.5 TON STANDARD EFFICIENCY SUPERHEAT
CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
37 UNIT CONTROL BOARD FLASH CODES . . . . . . . . 40
4
Unitary Products Group
035-17311-003-A-0704
GENERAL
REFERENCE
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.
Additional information is available in the following reference
forms:
These units are completely assembled on rigid, permanently
attached base rails. All piping, refrigerant charge, and electrical 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.
SAFETY CONSIDERATIONS
Due to system pressure, moving parts, and electrical components, 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 cleaning coils and filters and replacing filters.
Observe all precautions in the literature, labels, and tags
accompanying the equipment whenever working on air conditioning equipment. Be sure to follow all other applicable
safety precautions and codes.
Wear safety glasses and work gloves. Use quenching cloth
and have a fire extinguisher available during brazing operations.
INSPECTION
As soon as a unit is received, it should be inspected for possible 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 furnace is not to be used for temporary heating
of buildings or structures under construction.
Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury. Improper
installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer
to this manual. For assistance or additional information consult a qualified installer, service agency.
Unitary Products Group
• General Installation - DM090 - 150, 035-17311-002
• Pre-start & Post-start Check List - 035-18466-000
• 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
• Unit Renewal Parts List 035-17288-000
APPROVALS
Design certified by CSA as follows:
1.
For use as a cooling only unit, cooling unit with supplemental electric heat or a forced air furnace.
2.
For outdoor installation only.
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 covering materials .
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.
Incorrect installation may create a condition where the
operation of the product could cause personal injury
or property damage.
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.
5
035-17311-003-A-0704
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
Installation Options
Additional Options
M = R-22 Standard Efficiency
3 = 380-3-60
Nominal Cooling Capacity - MBH
090 = 7-½ Ton
120 = 10 Ton
150 = 12-½ Ton
Heat Type & Nominal Heat Capacity
C00 = Cooling Only. Suitable for field installed electric heat
Electric Heat Options
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
A = No Options Installed
B = Option 1
C = Option 2
D = Options 1 & 2
E = Option 3
F = Option 4
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
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
(See Next Page)
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)
6
Unitary Products Group
035-17311-003-A-0704
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
Unitary Products Group
7
035-17311-003-A-0704
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
JJ
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
8
Unitary Products Group
035-17311-003-A-0704
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
Unitary Products Group
9
035-17311-003-A-0704
INSTALLATION
INSTALLATION SAFETY INFORMATION
Read these instructions before continuing this appliance
installation. This is an outdoor combination heating and cooling 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
1.
Installation
Instruction
Packet
Bracket
Screws
FIGURE 1 2.
Toolless
Doorknobs
Remove the two screws holding the brackets in the front,
rear and compressor side fork-lift slots.
Turn down
UNIT SHIPPING BRACKET
Turn each bracket toward the ground and the protective
plywood covering will drop to the ground.
FIGURE 3 -
COMPRESSOR SECTION
LIMITATIONS
These units must be installed in accordance with the following:
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.
Barometric
Relief Hood in
Shipping Location (if included)
FIGURE 2 -
10
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.
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).
CONDENSER COVERING
Unitary Products Group
035-17311-003-A-0704
Terminal block for
hi-voltage connection
Simplicity™ Control board
w/screw connector
Disconnect location
for T-stat wiring and
(optional disconnect switch)
network connection
Filter access (2” throw-away)
Filter drier (solid
core)
Condenser
section
Second model nameplate 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 (highefficiency compressor with
crankcase heater
Compressor #1 access (highefficiency compressor w/
crankcase heater))
Slide-out drain pan
with steel 3/4” FPT
connection
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)
Base rails w/forklift slots (3 sides)
and lifting holes)
Side entry power
and control wiring
knockouts
Tool-less door
latch
FIGURE 4 -
PREDATOR® COMPONENT LOCATION
TABLE 1: UNIT VOLTAGE LIMITATIONS
Power Rating
Minimum
Maximum
380
350
418
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.
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.
6.
Maintain level tolerance to 1/2” across the entire width
and length of unit.
TABLE 2: UNIT TEMPERATURE LIMITATIONS
Temperature
Min.
Max.
Wet Bulb Temperature (°F) of Air on
Evaporator Coil
57
72
Dry Bulb Temperature (°F) of Air on
Condenser Coil
0*
125
*.
RIGGING AND HANDLING
A low ambient accessory is available for operation
down to -20°F.
LOCATION
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.
Use the following guidelines to select a suitable location for
these units:
1.
Unit is designed for outdoor installation only.
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
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 underside.
11
035-17311-003-A-0704
TABLE 4: 6 POINT LOAD WEIGHT
Location (lbs.)*
Model
Before lifting, make sure the unit weight is distributed equally on the rigging cables so it will lift evenly.
Units may be moved or lifted with a forklift. Slotted openings
in the base rails are provided for this purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF 60
INCHES.
A
B
C
D
E
F
DM090
158
142
128
187
207
230
DM120
168
151
136
198
219
244
DM150
180
161
145
212
235
262
*.
Weights include largest gas heat option.
TABLE 5: 4 POINT LOAD WEIGHT
Location (lbs.)*
Model
All panels must be secured in place when the unit is
lifted.
A
B
C
D
DM090
230
197
287
336
DM120
245
209
305
357
DM150
262
224
327
382
*.
The condenser coils should be protected from rigging cable damage with plywood or other suitable
material.
Weights include largest gas heat option.
F R O N T
L E F T
F R O N T
L E F T
B
E
F
C
FIGURE 6 A
D
C
B
A
UNIT 6 POINT LOAD
D
FIGURE 5 -
UNIT 4 POINT LOAD
TABLE 3: UNIT WEIGHTS
Model
Shipping
Weight*
(lb.)
47-1/2"
†
Operating Weight (lb.)
DM090
1056
1051
DM120
1121
1116
DM150
1200
1195
Econ.
85
84
w/ PE
150
148
Elec. Heat2
49
49
12
*.
Weights include largest gas heat option.
†.
54kW heater.
LEFT
FIGURE 7 -
25-1/2"
FRONT
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 operation.
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.
3 0 -1 1 /3 2
5 0 -3 /4
C o n tro l
E n try
Ø 7 /8
P o w e r
E n try
Ø 2 -1 /2
4 -1 /4
Ø
C o n v
P
O
E
Ø
6 -3 /1 6
2 4 -3 /1 6
2 7
Top*
72”
Right
Front
36”
Left
Rear
8 9
UNIT DIMENSIONS
TABLE 6: UNIT CLEARANCES
†
F o r B a s e r a il
D im e n s io n s
S e e D e ta il A
F R O N T
F o r D r a in
D im e n s io n s
S e e D e ta il B
L E F T
FIGURE 8 -
e n ie n c e
o w e r
u tle t
n try
7 /8
1 7 -3 /1 6
3 0 -3 /1 6
5 9
P o w e r
E n try
2 -1 /2
12”
36”
‡
36”
0”
Bottom
*.
Units must be installed outdoors. Overhanging structure or shrubs should not obstruct condenser air discharge 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 separating the corner wall.
‡.
Units may be installed on combustible floors made from
wood or class A, B or C roof covering materials.
DETAIL A
5 -1 /4
B a s e
P a n
1 7 -1 3 /1 6
Unitary Products Group
DETAIL B
2 -3 /8
3 -3 /4
3 -9 /1 6
DETAIL C
G a s P ip e In le t
V ie w o f W a ll A c r o s s fr o m
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.
5 -3 /8
C o il
13
035-17311-003-A-0704
.
32-11/16
6-13/16
6-13/16
Supply
Air
6-13/16
Return
Air
24
27-1/2
LEFT
21
18
21-3/16
19-3/16
17-3/16
12-15/16
7-1/8
FRONT
1423/32
16-3/8
Bottom Gas
Supply Entry
Bottom
Power, Control
and
Convenience
Outlet Wiring
Entries
Bottom
Condensate
Entry
18-1/16
19-5/8
63-1/2
FIGURE 9 -
BOTTOM DUCT OPENINGS (FROM ABOVE)
1 8 -1 /4
D o t P lu g s
R e tu rn
A ir
2 8 -1 /4
S u p p ly
A ir
1 8 -1 /4
P a tc h P la te
F o r S lid e - O u t
D r a in P a n
1 8 -1 /1 6
2 -3 1 /3 2
5 -5 /3 2
2 8 -1 /4
3 1 -1 1 /1 6
FIGURE 10 - REAR DUCT DIMENSIONS
14
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 recognized 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 application, 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.
R IG H T
8 0 -5 /8
IN S U L A T E D D E C K U N D E R
C O N D E N S E R S E C T IO N
2 0
2 0
S U P P L Y
6
R E T U R N
2 T Y P .
3 0
IN S U L A T E D D E C K U N D E R
C O M P R E S S O R S E C T IO N
5 0 -1 /2
F R O N T
8 o r 1 4
FIGURE 11 - PREDATOR® ROOF CURB DIMENSIONS
2 T Y P
5 0 -1 /2
3 0 -1 /2
2 3
4
8 0 -5 /8
2 6
R E T U R N
S U P P L Y
1 0
7 6 -5 /8
9 4
F R O N T
5 9 -1 /4
6 4 -1 /4
R IG H T
FIGURE 12 - SUNLINE™ TO PREDATOR® TRANSITION ROOF CURBS
Unitary Products Group
15
035-17311-003-A-0704
CONDENSATE DRAIN
When fastening ductwork to side duct flanges on
unit, insert screws through duct flanges only. DO
NOT insert screws through casing. Outdoor ductwork must be insulated and water-proofed.
The side condensate drain is reversible and maybe re-oriented to the rear of the cabinet to facilitate condensate piping. 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.
Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install condensate drain line
from the 3/4 inch NPT female connection on the unit to an
open drain.
O P T IO N A L C O IL
G U A R D
3 " M in im u m
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
FIGURE 15 - DISCHARGE PANEL IN PLACE
16
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 filters 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.
Unitary Products Group
035-17311-003-A-0704
THERMOSTAT WIRING
The thermostat should be located on an inside wall approximately 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.
TABLE 7: CONTROL WIRE SIZES
*.
*
Wire Size
Maximum Length
18 AWG
150 Feet
From the unit to the thermostat and back to the unit.
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 Electrical 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.
Voltage tolerances which must be maintained at the compressor 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.
A disconnect must be utilized for these units. Factory
installed disconnects are available. If installing a disconnect
(field supplied or York International® supplied accessory),
refer to Figure 4 for the recommended mounting location.
Unitary Products Group
Avoid damage to internal components if drilling
holes for disconnect mounting.
NOTE: Since not all local codes allow the mounting of a disconnect on the unit, please confirm compliance with
local code before mounting a disconnect on the unit.
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.
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.
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 supplied disconnect switch.
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.
Power wiring is brought into the unit through the side of the
unit or the basepan inside the curb.
17
035-17311-003-A-0704
T H E R M
T E R M
O S T A T
IN A L S
1
U N IT T E R M IN A L S
S T R IP T B 1
R C
R H
R
Y 1
Y 1
Y 2
Y 2
W
1
W
W
2
1
W
G
2
G
C
C
X 1
X 3
X
2
2 4 V o lt
T r a n s fo r m
e r
O C C
X 4
A 1
A 2
T
T
T O R E M O T E S E N S O R
2 E T 0 4 7 0 1 3 2 4 IF U S E D
1
2
E le c tr o n ic p r o g r a m m a b le T h e r m o s ta t 2 E T 0 7 7 0 0 1 0 0 2 4 ( in c lu d e s s u b b a s e ) .
T e r m in a ls A 1 a n d A 2 p r o v id e a r e la y o u tp u t to c lo s e th e o u td o o r
e c o n o m iz e r d a m p e r s w h e n th e th e r m o s ta t s w itc h e s to th e s e t- b a c k p o s itio n .
FIGURE 17 - ELECTRONIC THERMOSTAT FIELD WIRING
T -S T A T
W 1
W 1
W 2
W 2
Y 1
Y 1
G
G
Y 2
O C C
R H
R C
R E M O T E
M IN P O S
C
U N IT C O N T R O L
B O A R D
Y 2
X
R
S D
C
FIGURE 18 - FIELD WIRING 24 VOLT THERMOSTAT
18
Unitary Products Group
035-17311-003-A-0704
FIGURE 19 - FIELD WIRING DISCONNECT
TABLE 8: ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET
Compressors
Voltage
RLA
ea.
380
*
OD Fan
Motors
LRA
ea.
FLA
ea.
Supply
Blower
Motor FLA
1.5
HP
2
HP
Pwr
Pwr
Exh
Conv
Motor Outlet
FLA
Electric Heater
Model No.
Actual Heater
KW
Amps
FLA
None
2TP04520950
3.1
4.1
2.2
0.0
7.1
54.0
0.8
2TP04521850
2TP04522450
2TP04523650
Maximum HACR breaker of the same AMP size is applicable.
-5.6
11.3
15
21.3
-8.5
17.2
22.8
32.4
Min.
Circuit
Ampacity
(Amps)
1.5
2
HP HP
20.7 21.7
20.7 21.7
25.3 26.6
32.4 33.6
44.3 45.6
Max
Max Fuse*
MCA
Fuse*
Size
w/Power
Size
w/Power
Exhaust
(Amps)
Exhaust
(Amps)
1.5
2
1.5 2
1.5
2
HP HP HP HP HP
HP
22.9 23.9 25 25
25
30
22.9 23.9 25 25
25
30
28.1 29.3 30 30
30
30
35.1 36.4 35 35
40
40
47.1 48.3 45 50
50
50
TABLE 9: ELECTRICAL DATA - DM090 (7-1/2 TON) WITH POWER CONVENIENCE OUTLET
Voltage
OD Fan
Compressors
Motors
RLA
ea.
380
*
LRA
ea.
FLA
ea.
Supply
Blower
Motor FLA
1.5
HP
2
HP
Pwr
Pwr
Exh
Conv
Motor Outlet
FLA
Electric Heater
Model No.
FLA
None
2TP04520950
7.1
54.0
0.8
3.1
4.1
2.2
6.3
2TP04521850
2TP04522450
2TP04523650
Maximum HACR breaker of the same AMP size is applicable.
Unitary Products Group
Actual Heater
KW
Amps
-5.6
11.3
15
21.3
-8.5
17.2
22.8
32.4
Min.
Circuit
Ampacity
(Amps)
1.5
2
HP HP
27
28
27
28
33.2 34.5
40.2 41.5
52.2 53.5
MCA
Max
Max Fuse*
Fuse*
w/Power
Size
Size
Exhaust
w/Power
(Amps)
(Amps)
Exhaust
1.5
2
1.5 2
1.5
2
HP HP HP HP HP
HP
29.2 30.2 30 35
35
35
29.2 30.2 30 35
35
35
36 37.2 35 35
40
40
43 44.2 45 45
45
45
55 56.2 60 60
60
60
19
035-17311-003-A-0704
TABLE 10: ELECTRICAL DATA - DM120 (10 TON) WITHOUT POWER CONVENIENCE OUTLET
Pwr
Pwr
Supply
OD Fan
Conv
Compressors
Blower Motor Exh
Motors
Voltage
Motor Outlet
FLA
RLA
ea.
380
*
LRA
ea.
FLA
ea.
2
HP
3
HP
FLA
Electric Heater
Model No.
FLA
None
2TP04521850
0.0
11.5
75.0
1.6
4.1
5.3
2.2
2TP04522450
2TP04523650
2TP04525450
Maximum HACR breaker of the same AMP size is applicable.
Max
Max Fuse*
MCA
Min. Circuit
Fuse*
Size
w/Power
Ampacity
Actual Heater
Size
w/Power
Exhaust
(Amps)
KW
Amps
(Amps)
Exhaust
(Amps)
2
3
2
3
2
3
2
3
HP HP HP HP HP HP HP
HP
--33.2 34.4 35.4 36.6 40 45
45
45
11.3
17.2
33.2 34.4 35.4 36.6 40 45
45
45
15
22.8
33.6 35.1 36.4 37.9 40 45
45
45
21.3
32.4
45.6 47.1 48.3 49.8 50 50
50
50
33.8
51.4
69.3 70.8 72.1 73.6 70 80
80
80
TABLE 11: ELECTRICAL DATA - DM120 (10 TON) WITH POWER CONVENIENCE OUTLET
Supply
Pwr
Pwr
OD Fan
Compressors
Blower Motor Exh
Conv
Motors
Voltage
FLA
Motor Outlet
RLA
ea.
380
*
LRA
ea.
FLA
ea.
2
HP
3
HP
FLA
Electric Heater
Model No.
FLA
None
2TP04521850
11.5
75.0
1.6
4.1
5.3
2.2
6.3
2TP04522450
2TP04523650
2TP04525450
Maximum HACR breaker of the same AMP size is applicable.
Max Fuse*
MCA
Max
Min. Circuit
Size
w/Power
Fuse*
Ampacity
Actual Heater
w/Power
Exhaust
Size
(Amps)
KW
Amps
Exhaust
(Amps)
(Amps)
2
3
2
3
2
3
2
3
HP HP HP HP HP HP HP
HP
--39.5 40.7 41.7 42.9 50 50
50
50
11.3
17.2
39.5 40.7 41.7 42.9 50 50
50
50
15
22.8
41.5 43 44.2 45.7 50 50
50
50
21.3
32.4
53.5 55 56.2 57.7 60 60
60
60
33.8
51.4
77.2 78.7 79.9 81.4 80 80
80
90
TABLE 12: ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET
Compressors
Voltage
RLA
ea.
380
*
LRA
ea.
OD Fan
Motors
FLA
ea.
Supply
Blower
Motor FLA
3
HP
5
HP
Pwr
Pwr
Exh
Conv
Motor Outlet
FLA
Electric Heater
Model No.
Actual Heater
KW
Amps
FLA
None
2TP045E11850
5.3
8.1
2.2
0.0
12.2
88.0
1.6
2TP045E12450
2TP045E13650
2TP045E15450
Maximum HACR breaker of the same AMP size is applicable.
-11.3
15
21.3
33.8
-17.2
22.8
32.4
51.4
Min.
Circuit
Ampacity
(Amps)
3
5
HP HP
36.0 38.8
36.0 38.8
36.0 38.8
47.1 50.6
70.8 74.3
Max
Max Fuse*
MCA
Fuse*
Size
w/Power
Size
w/Power
Exhaust
(Amps)
Exhaust
(Amps)
3
5
3
5
3
5
HP HP HP HP HP
HP
38.2 41.0 45 50
50
50
38.2 41.0 45 50
50
50
38.2 41.4 45 50
50
50
49.8 53.3 50 60
50
60
73.6 77.1 80 80
80
80
TABLE 13: ELECTRICAL DATA - DM150 (12-1/2 TON) WITH POWER CONVENIENCE OUTLET
Compressors
Voltage
RLA
ea.
380
*
20
LRA
ea.
Supply
Pwr
Pwr
OD Fan
Blower Motor Exh
Conv
Motors
FLA
Motor Outlet
FLA
ea.
3
HP
5
HP
FLA
Electric Heater
Model No.
FLA
None
2TP045E11850
12.2
88.0
1.6
5.3
8.1
2.2
6.3
2TP045E12450
2TP045E13650
2TP045E15450
Maximum HACR breaker of the same AMP size is applicable.
Max Fuse*
MCA
Max
Min. Circuit
Size
w/Power
Fuse*
Ampacity
Actual Heater
w/Power
Exhaust
Size
(Amps)
KW
Amps
Exhaust
(Amps)
(Amps)
3
5
3
5
3
5
3
5
HP HP HP HP HP HP HP
HP
--42.3 45.1 44.5 47.3 50 50
50
50
11.3
17.2
42.3 45.1 44.5 47.3 50 50
50
50
15
22.8
43 46.5 45.7 49.2 50 50
50
50
21.3
32.4
55 58.5 57.7 61.2 60 60
60
70
33.8
51.4
78.7 82.2 81.4 84.9 80 90
90
90
Unitary Products Group
035-17311-003-A-0704
TABLE 14: PHYSICAL DATA
Models
Component
Evaporator
Blower
Evaporator
Coil
DM
090
120
150
Blower, Centrifugal (Dia. X Wd. in.)
15 x 15
15 x 15
15 x 15
Motor, Standard (HP)
1-1/2
2
3
Motor, Optional (HP)
2
3
5
Rows
2
2
3
Fins per Inch
15
15
15
Height (in.)
2
Face Area (ft. each)
Condenser
Fan
(2 per Unit)
DM
Condenser
Coil
(2 per unit)
DM
Refrigerant
Charge
DM
Compressors
DM
Air Filters
40
40
13.2
13.2
Propeller Dia. (in., each)
24
24
24
Motor (HP, each)
1/3
3/4
3/4
CFM, Nominal (each)
3400
4400
4400
Rows (each)
1
1
2
Fins per Inch
20
20
20
Height (in. each)
28
44
44
Face Area (ft.2 each)
9.2
14.5
14.5
System 1 (lb./oz.)
4/12
6/12
10/12
System 2 (lb./oz.)
4/6
6/12
11/0
Quantity
2
2
2
Type
Recip
Recip
Scroll
Size (Wd. x Ht. x Thickness in.)
25x20x2
25x20x2
25x20x2
Number Per Unit
4
4
4
OPTIONS/ACCESSORIES
ELECTRIC HEAT ACCESSORIES
Electric heaters are available as field installed accessories.
Refer to electric heat instructions for installation. These heaters 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.
ELECTRIC HEAT OPTION
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.
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 electrical data.
Unitary Products Group
32
10.6
TABLE 15: MINIMUM SUPPLY AIR CFM
Heater
Unit Model Size, Nominal Tons
7.5
kW
10
12.5
Voltage
Minimum Supply Air CFM
9
2250
N/A
N/A
18
2250
3000
3750
2250
3000
3750
36
2250
3000
3750
54
N/A
3000
3750
24
380
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 complete the assembly. Field installed Motorized Outdoor
Damper accessories include complete instructions for installation.
21
035-17311-003-A-0704
ECONOMIZER
The Economizer 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 complete the
assembly. Field installed Economizer accessories include
complete instructions for installation.
ON position and then OFF or energize and de-energize
terminals “R” to “G”.
•
With the thermostat set to the indoor fan ON position or
terminals “R” to “G” energized, turn the Minimum Position Adjusting screw (located on the damper control
module) counterclockwise until the desired minimum
damper position has been attained.
There are two Economizer options:
1.
Down Flow application with barometric relief hood
standard.
2.
Horizontal Flow application that requires the purchase of
a barometric relief hood.
ENTHALPY SET POINT ADJUSTMENT
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:
POWER EXHAUST
•
The Power Exhaust 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 complete the
assembly. Field installed Power Exhaust accessories include
complete instructions for installation.
For a single enthalpy operation carefully turn the set
point adjusting screw (found on the damper control module) to the "A", "B", "C" or "D" setting corresponding to
the lettered curve of the Enthalpy Set Point Adjustment
Figure 20.
•
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.
There are two field installed Power Exhaust accessories:
1.
Down Flow application.
2.
Horizontal Flow application that requires the purchase of
a barometric relief hood.
RAIN HOOD
All of the hood components, including the filters, the gasketing 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.
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
•
22
Check that the damper blades move smoothly without
binding; carefully turn the Minimum Position Adjust
screw (found on the damper control module) fully clockwise and then set the thermostat indoor fan switch to the
POWER EXHAUST DAMPER SET POINT (WITH OR WITHOUT POWER EXHAUST)
•
With no power exhaust option, adjust the Exhaust Air
Adjustment Screw fully clockwise. This will allow 2nd
stage cooling to operate.
•
With power exhaust option, each building pressurization
requirement will be different. The point at which the
power exhaust comes on is determined by the economizer 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.
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 Ventilation 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.
•
Optional CO2 Space Sensor Kit Part # 2AQ04700324
•
Optional CO2 Sensor Kit Part # 2AQ04700424
Replace the top rear access panel on the unit.
Unitary Products Group
035-17311-003-A-0704
CONTROL
CURVE
CONTROL POINT
APPROX. 0F (0C)
AT 50% RH
A
73 (23)
B
C
70 (21)
67 (19)
D
63 (17)
85 90 95 100 105 110
(29) (32) (35) (38) (41) (43)
80
(27)
75
(24)
70
(21)
65
(18)
60
(16)
55
(13)
50
(10)
45
(7)
35
(2)
A
B
C
D
40
(4)
B A
D C
35
(2)
40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)
APPROXIMATE DRY BULB TEMPERATURE - 0F (0C)
FIGURE 20 - ENTHALPY SET POINT CHART
Exhaust Air
Adjustment
Screw
Exhaust Air LED
Damper Min.
Position
Screw
Indoor Air Quality
Max. Adjustment
Screw
N1
N
EXH
Set
TR
P1
P
EXH
24
Vac
HOT
T1
T
Min
Pos
IAQ
Max
Indoor Air Quality
LED
AQ1
AQ
IAQ
SO
IAQ
Min
TR1
24
Vac
COM
+
1
2
5
Indoor Air Quality
Min. Adjustment
Screw
Free Cooling LED
SO+
3
4
EF
EF1
Free
Cool
SR+
SR
B
A
C
D
Economizer Enthalpy
Set Point Adjustment
Screw
FIGURE 21 - HONEYWELL ECONOMIZER CONTROL W7212
Unitary Products Group
23
035-17311-003-A-0704
PHASING
A
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 connection to the unit is misphased. Change the phasing of the Field
Line Connection at the factory or field supplied disconnect 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.)
A
C*
* NEVER LOOSEN
A
B
SPAN LENGTH
Scroll compressors require proper rotation to operate correctly. Units are properly phased at the factory. Do not change the internal wiring to make the
blower condenser fans, or compressor rotate correctly.
DEFL. FORCE
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
2250
3750
120
3000
5000
150
3750
6250
BELT TENSION
The tension on the belt should be adjusted as shown in
Figure 22.
Procedure for adjusting belt tension:
1.
2.
3.
4.
Loosen six nuts (top and bottom) A.
Adjust by turning (B).
Never loosen nuts (C).
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.
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 recommended for the belt section. Check the belt tension 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).
24
Unitary Products Group
035-17311-003-A-0704
TABLE 17: 7-1/2 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE* †
TURNS OPEN**
ESP‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.2
-
-
-
3715
1573
1.69
3634
1434
1.54
3431
1265
1.36
3218
901
0.97
3024
976
1.05
0.4
3650
1657
1.78
3510
1490
1.60
3320
1313
1.41
3079
1145
1.23
2832
810
0.87
2586
860
0.92
0.6
3334
1522
1.63
3146
1351
1.45
2910
1169
1.25
2621
1005
1.08
2307
706
0.76
-
-
-
0.8
2903
1352
1.45
2622
1167
1.25
2404
1013
1.09
2054
858
0.92
-
-
-
-
-
-
1.0
2356
1159
1.24
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.
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
TABLE 18: 7-1/2 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE* †
TURNS OPEN**
ESP‡
0
1
2
3
4
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
5
BHP
CFM
W††
BHP
0.2
-
-
-
-
-
-
-
-
-
-
-
-
3992
1904
2.04
3798
1679
1.80
0.4
-
-
-
-
-
-
-
-
-
3930
2017
2.16
3734
1786
1.92
3486
1552
1.66
0.6
-
-
-
-
-
-
3947
2176
2.33
3670
1895
2.03
3394
1641
1.76
3084
1401
1.50
0.8
-
-
-
4138
2384
2.56
3623
2009
2.15
3323
1742
1.87
2971
1477
1.58
2591
1236
1.33
1.0
4126
2430
2.61
3643
2145
2.30
3224
1820
1.95
2889
1569
1.68
2466
1306
1.40
-
-
-
1.2
3613
2238
2.40
3143
1921
2.06
2748
1621
1.74
2369
1385
1.49
-
-
-
-
-
-
1.4
3099
2039
2.19
2636
1714
1.84
2195
1424
1.53
-
-
-
-
-
-
-
-
-
1.6
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
25
035-17311-003-A-0704
TABLE 19: 10 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE* †
TURNS OPEN**
ESP‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.2
-
-
-
-
-
-
-
-
-
3896
1639
1.76
3688
1453
1.56
3447
1268
1.36
0.4
4040
2076
2.23
4005
1934
2.07
3790
1698
1.82
3569
1508
1.62
3333
1330
1.43
3057
1147
1.23
0.6
3890
2006
2.15
3697
1790
1.92
3427
1550
1.66
3152
1356
1.45
-
-
-
-
-
-
0.8
3620
1882
2.02
3324
1629
1.75
2972
1380
1.48
-
-
-
-
-
-
-
-
-
1.0
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‡
0
1
CFM
††
W
BHP
0.4
4965
3485
0.6
4876
3416
0.8
4713
1.0
2
CFM
††
W
BHP
3.74
4875
3150
3.66
4651
2997
3291
3.53
4387
4476
3116
3.34
1.2
4165
2898
1.4
3779
2646
1.6
3319
2372
2.54
26
3
CFM
W
††
BHP
3.38
4613
2739
3.21
4359
2582
2823
3.03
4077
4084
2632
2.82
3.11
3741
2427
2.84
3359
2212
-
-
4
CFM
W
††
BHP
2.94
4322
2374
2.77
4038
2220
2417
2.59
3719
3768
2245
2.41
2.60
3432
2070
2.37
3069
1895
-
-
-
5
CFM
W
††
BHP
CFM
W††
BHP
2.55
4156
2106
2.26
3907
1860
1.99
2.38
3860
1966
2.11
3590
1724
1.85
2059
2.21
3541
1827
1.96
3242
1584
1.70
3365
1892
2.03
3197
1691
1.81
-
-
-
2.22
-
-
-
-
-
-
-
-
-
2.03
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.
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‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.4
5078
3630
3.89
4809
3103
3.33
4594
3053
3.27
4360
2478
2.66
4090
2093
2.24
3812
1798
1.93
0.6
4865
3456
3.71
4584
2961
3.17
4349
2912
3.12
4106
2318
2.49
3814
1964
2.11
-
-
-
0.8
4642
3284
3.52
4356
2828
3.03
4089
2776
2.98
3840
2137
2.29
-
-
-
-
-
-
1.0
4408
3114
3.34
4124
2705
2.90
3815
2647
2.84
-
-
-
-
-
-
-
-
-
1.2
4164
2947
3.16
3889
2592
2.78
-
-
-
-
-
-
-
-
-
-
-
-
1.4
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‡
0
1
2
3
4
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
5
BHP
CFM
W††
BHP
0.4
5994
5400
5.79
5565
4369
4.69
5488
4169
4.47
5264
3599
3.86
4990
3085
3.31
4738
2812
3.02
0.6
5824
5216
5.59
5368
4186
4.49
5289
3991
4.28
5049
3437
3.69
4763
2937
3.15
4491
2655
2.85
0.8
5641
5022
5.39
5170
4012
4.30
5076
3807
4.08
4822
3272
3.51
4528
2790
2.99
4235
2497
2.68
1.0
5444
4819
5.17
4971
3846
4.12
4847
3618
3.88
4584
3103
3.33
4286
2644
2.83
3969
2340
2.51
1.2
5233
4609
4.94
4771
3687
3.95
4604
3426
3.67
4335
2933
3.15
4035
2499
2.68
-
-
-
1.4
5009
4394
4.71
4571
3537
3.79
4346
3233
3.47
4074
2762
2.96
3777
2356
2.53
-
-
-
1.6
4771
4174
4.48
4370
3395
3.64
4074
3040
3.26
3802
2590
2.78
-
-
-
-
-
-
1.8
4520
3951
4.24
4169
3262
3.50
3786
2850
3.06
-
-
-
-
-
-
-
-
-
2.0
4255
3728
4.00
3966
3137
3.36
-
-
-
-
-
-
-
-
-
-
-
-
2.2
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
27
035-17311-003-A-0704
TABLE 23: 7-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE* †
TURNS OPEN**
ESP‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.4
-
-
-
-
-
-
3736
1476
1.58
3487
1284
1.38
3231
1109
1.19
3001
970
1.04
0.6
-
-
-
3572
1514
1.62
3389
1339
1.44
3094
1151
1.23
2764
972
1.04
2446
824
0.88
0.8
3422
1558
1.67
3179
1364
1.46
2889
1164
1.25
2554
985
1.06
-
-
-
-
-
-
1.0
2891
1347
1.44
2372
1088
1.17
2050
922
0.99
-
-
-
-
-
-
-
-
-
1.2
2017
1051
1.13
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.
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‡
0
CFM
W
††
1
BHP
CFM
W
††
2
BHP
CFM
††
W
3
BHP
CFM
W
††
4
BHP
CFM
W
††
5
BHP
CFM
W††
BHP
0.4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3910
1726
1.85
0.6
-
-
-
-
-
-
-
-
-
-
-
-
3857
1842
1.98
3597
1430
1.53
0.8
-
-
-
-
-
-
-
-
-
3804
1957
2.10
3503
1689
1.81
3172
1430
1.53
1.0
-
-
-
-
-
-
3774
2088
2.24
3406
1778
1.91
3032
1497
1.61
2248
1143
1.23
1.2
-
-
-
-
-
-
3327
1866
2.00
2926
1578
1.69
2160
1217
1.31
-
-
-
1.4
-
-
-
3270
1971
2.11
2537
1544
1.66
2043
1296
1.39
-
-
-
-
-
-
1.6
3196
2077
2.23
2460
1651
1.77
-
-
-
-
-
-
-
-
-
-
-
-
1.8
2426
1768
1.90
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
28
*.
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‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.2
-
-
-
-
-
-
-
-
-
3896
1639
1.76
3688
1453
1.56
3447
1268
1.36
0.4
4040
2076
2.23
4005
1934
2.07
3790
1698
1.82
3569
1508
1.62
3333
1330
1.43
3057
1147
1.23
0.6
3890
2006
2.15
3697
1790
1.92
3427
1550
1.66
3152
1356
1.45
-
-
-
-
-
-
0.8
3620
1882
2.02
3324
1629
1.75
2972
1380
1.48
-
-
-
-
-
-
-
-
-
1.0
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‡
0
1
2
3
4
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
5
BHP
CFM
W††
BHP
0.4
4965
3485
3.74
4875
3150
3.38
4613
2739
2.94
4322
2374
2.55
4156
2106
2.26
3907
1860
1.99
0.6
4876
3416
3.66
4651
2997
3.21
4359
2582
2.77
4038
2220
2.38
3860
1966
2.11
3590
1724
1.85
0.8
4713
3291
3.53
4387
2823
3.03
4077
2417
2.59
3719
2059
2.21
3541
1827
1.96
3242
1584
1.70
1.0
4476
3116
3.34
4084
2632
2.82
3768
2245
2.41
3365
1892
2.03
3197
1691
1.81
-
-
-
1.2
4165
2898
3.11
3741
2427
2.60
3432
2070
2.22
-
-
-
-
-
-
-
-
-
1.4
3779
2646
2.84
3359
2212
2.37
3069
1895
2.03
-
-
-
-
-
-
-
-
-
1.6
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
29
035-17311-003-A-0704
TABLE 27: 12-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE* †
TURNS OPEN**
ESP‡
0
1
2
3
4
5
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
CFM
W††
BHP
0.4
-
-
-
-
-
-
5201
3162
3.39
4966
2796
3.00
4681
2405
2.58
4355
2054
2.20
0.6
-
-
-
5220
3395
3.64
4942
2980
3.20
4657
2608
2.80
4358
2230
2.39
4007
1890
2.03
3194
3.43
4661
2806
3.01
4378
2572
2.76
4016
2057
2.21
0.8
-
-
-
4944
-
-
-
1.0
5003
3490
3.74
4647
2988
3.20
4380
2636
2.83
4030
2257
2.42
-
-
-
-
-
-
1.2
4724
3290
3.53
4363
2875
3.08
4012
2505
2.69
-
-
-
-
-
-
-
-
-
1.4
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‡
0
1
CFM
W††
BHP
CFM
W††
2
3
4
CFM
W††
BHP
CFM
W††
BHP
BHP
CFM
W††
BHP
0.4
-
-
-
6447
5315
5.1046
5966
4205
4.51
5717
3716
3.98
5470
3307
3.55
0.6
-
-
-
6110
0.8
-
-
-
5772
4464
4.79
5740
4023
4.31
5430
3501
3.75
5126
3054
3.28
4274
4.58
5503
3821
4.10
5162
3294
3.53
4849
2870
3.08
1.0
6235
5521
5.92
5474
4048
4.34
5244
3611
3.87
4882
3101
3.33
4530
2667
2.86
1.2
5881
5137
5.51
4.51
5248
3854
4.13
4941
3387
3.63
4589
2906
3.12
4225
2502
2.68
1.4
5695
4950
5.31
1.6
5471
4728
5.07
3996
4.29
5014
3670
3.94
4651
3178
3.41
4284
2716
2.91
3858
2280
2.45
3828
4.11
4732
3460
3.71
4365
2983
3.20
3951
2516
2.70
3491
2058
2.21
1.8
5242
4514
4.84
3611
3.87
4438
3240
3.47
3998
2740
2.94
3618
2316
2.48
-
-
-
2.0
4954
4231
4339
3380
3.62
3905
2861
3.07
3631
2497
2.68
-
-
-
-
-
-
2.2
4585
2.4
4217
4.22
4022
3149
3.38
-
-
-
-
-
-
-
-
-
-
-
-
3.90
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2.6
3848
3.58
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CFM
W††
BHP
5.70
6207
4760
4917
5.27
5965
4519
4.85
5741
5628
4407
4.73
5384
4205
5123
4919
4656
4.54
3934
3637
3340
5
*.
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:
•
•
30
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 resistances have been deducted from the total static pressure
of the blower.
Unitary Products Group
035-17311-003-A-0704
TABLE 29: INDOOR BLOWER SPECIFICATIONS
MODEL
DM090
DM120
DM150
MOTOR
HP
RPM
Eff.
MOTOR SHEAVE
SF
Frame
Datum Dia. (in.)
Bore (in.)
BLOWER SHEAVE
Model
Datum Dia. (in.)
Bore (in.)
Model
BELT
1-1/2
1725
80%
1.15
56
3.4 - 4.4
7/8
1VM50
9.0
1
AK94
A57
2
1725
80%
1.15
56
3.4 - 4.4
7/8
1VM50
7.5
1
AK79
A55
2
1725
80%
1.15
56
3.4 - 4.4
7/8
1VM50
8.5
1
AK89
A56
3
1725
80%
1.15
56
3.4 - 4.4
7/8
1VM50
7.0
1
AK74
A54
3
1725
80%
1.15
56
3.4 - 4.4
7/8
1VM50
7.0
1
AK74
A54
5
1725
87%
1.15
184T
4.3 - 5.3
1 1/8
1VP56
6.7
1
BK77
BX55
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
1.
Remove the dot plugs from the duct panel (for location of
the dot plugs see Figure 10).
2.
Insert eight-inches of 1/4 inch metal tubing into the airflow on both sides of the indoor coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow 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, measuring the pressure drop across a wet coil under field conditions could be inaccurate. To assure a dry coil, the
compressors should be de-activated while the test is
being run.
5.
6.
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.
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 position perpendicular 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 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.
5.
Select the correct blower performance table for the unit
from Tables 17 - 28. Tables are presented for horizontal
and downflow configuration.
6.
To adjust Measured CFM to Required CFM, see ’SUPPLY AIR DRIVE ADJUSTMENT’.
Determine the unit Measured CFM from the Blower Performance Table, External Static Pressure and the number of turns the variable motor sheave is open.
7.
After readings have been obtained, remove the tubes
and replace the dot plugs.
To adjust Measured CFM to Required CFM, see ’SUPPLY AIR DRIVE ADJUSTMENT’.
8.
After reading has been obtained, remove the tubes and
seal holes.
NOTE: De-energize the compressors before taking any test
measurements to assure a dry evaporator coil.
4.
METHOD TWO
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.
NOTE: With the addition of field installed accessories
repeat this procedure.
Failure to properly adjust the total system air quantity can result in extensive blower damage.
Failure to properly adjust the total system air quantity can result in extensive blower damage.
Unitary Products Group
31
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.
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 the equation to determine the required DD for the new
motor sheave,
CFM • 4.0 in. = 4.21 in.
( 4,000
3,800 CFM )
Use Table 31 to locate the DD nearest to 4.21 in. Close the
sheave to 1 turn open.
New BHP
3
= (Speed increase) • 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:
Required CFM
( Measured
CFM )
• Existing DD = New DD
3
= (Speed increase) • Original BHP
= New BHP
New motor Amps
3
= (Speed increase) • Amps at 3,800 CFM
Use the following tables and the DD calculated per the above
equation to adjust the motor variable pitch sheave.
3
= (Speed increase) • Original Amps
= New Amps
32
Unitary Products Group
035-17311-003-A-0704
TABLE 30: ADDITIONAL STATIC RESISTANCE
CFM
Cooling Only*
Economizer† ‡
2300
0.08
2500
0.09
Electric Heat KW†
9
18
24
36
54
0.02
0.07
0.08
0.09
0.10
0.13
0.02
0.08
0.09
0.10
0.11
0.14
0.16
2700
0.11
0.03
0.09
0.10
0.12
0.13
2900
0.12
0.03
0.10
0.11
0.13
0.14
0.18
3100
0.14
0.03
0.12
0.13
0.15
0.16
0.20
3300
0.16
0.03
0.13
0.14
0.17
0.18
0.22
3500
0.18
0.04
0.15
0.16
0.19
0.20
0.24
3700
0.20
0.04
0.17
0.18
0.21
0.22
0.26
3900
0.23
0.04
0.19
0.20
0.23
0.24
0.28
4100
0.25
0.04
0.21
0.22
0.25
0.26
0.31
4300
0.28
0.05
0.23
0.24
0.28
0.29
0.34
4500
0.30
0.05
0.25
0.26
0.30
0.31
0.37
4700
0.33
0.05
0.28
0.29
0.33
0.34
0.40
4900
0.36
0.05
0.30
0.31
0.35
0.37
0.43
5100
0.39
0.06
0.33
0.34
0.38
0.40
0.46
5300
0.42
0.06
0.35
0.37
0.41
0.43
0.49
5500
0.45
0.06
0.38
0.40
0.44
0.46
0.53
5700
0.48
0.06
0.41
0.43
0.47
0.49
0.56
5900
0.52
0.07
0.44
0.46
0.50
0.53
0.59
6100
0.56
0.07
0.47
0.49
0.53
0.56
0.62
6300
0.60
0.07
0.50
0.53
0.56
0.59
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.
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
Turns Open
Datum
Diameter
Turns Open
Datum
Diameter
0
4.4
1
5.3
1/2
4.3
1-1/2
5.2
1
4.2
2
5.1
1-1/2
4.1
2-1/2
5.0
2
4.0
3
4.9
2-1/2
3.9
3-1/2
4.8
3
3.8
4
4.7
3-1/2
3.7
4-1/2
4.6
4
3.6
5
4.5
4-1/2
3.5
5-1/2
4.4
5
3.4
6
4.3
Unitary Products Group
OPERATION
For the Predator® series of units, the thermostat makes a circuit between "R" and "Y1" for the first stage of cooling.
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.
When the "W1" call is sensed, the indoor air blower is energized following a specified heating delay.
If at any time a call for both heating and cooling are present,
the heating operation will be performed. If operating, the cooling system is halted as with a completion of a call for cooling.
Heating always takes priority.
33
035-17311-003-A-0704
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 operation is requested. The blower is energized after any specified
delay associated with the operation.
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.
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 completed. 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.
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 minimum 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.
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 energize compressor #1. If the outdoor air is above the set point,
"Y2" will energize compressor #2.
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 deenergized. 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 position. If the unit is in continues fan operation, the economizer
damper goes to the minimum position.
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, compressor #1 is energized. If compressor #1 is active for first
stage cooling or the first compressor is locked-out, compressor #2 is energized. In free-cooling mode, if the call for the
second stage of cooling continues for 20 minutes, compressor #2 is energized, provided it has not been locked-out.
ECONOMIZER WITH DUAL ENTHALPY SENSORS -
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.
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 operating, the second stage of mechanical cooling will not operate. As always, the "R" to "G" connection provides minimum
position but does not provide power exhaust operation.
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-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.
* 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 -
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 maximum operating efficiency.
ECONOMIZER WITH POWER EXHAUST -
MOTORIZED OUTDOOR AIR DAMPERS This system operation is the same as the units with no outdoor air options with one exception. When the "R" to "G" circuit 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.
When the room thermostat calls for "first-stage" cooling, the
low voltage control circuit from "R" to "G" and "Y1" is com-
34
Unitary Products Group
035-17311-003-A-0704
COOLING OPERATION ERRORS
LOW AMBIENT COOLING
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 compressors.
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.
HIGH-PRESSURE LIMIT SWITCH
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.
Should a high-pressure switch open three times within two
hours of operation, the UCB will lock-out the associated compressor and flash a code (see 37). If the other compressor is
inactive, the condenser fans will be de-energized.
LOW-PRESSURE LIMIT SWITCH
The low-pressure limit switch is not monitored during the initial 30 seconds of a cooling system's operation. For the following 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 deenergize the associated compressor, initiate the ASCD, and,
if the other compressor is idle, stop the condenser fans.
Once the low-pressure switch has been proven (closed during 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 condenser fans.
If the call for cooling is still present at the conclusion of the
ASCD, the UCB will re-energize the halted compressor.
Should a low-pressure switch open three times within one
hour 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.
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.
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
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.
Low ambient mode always begins with compressor operation. Compressor minimum run time may extend the minutes
of compressor operation. The defrost cycle will begin immediately following the elapse of the minimum run time.
When operating in low ambient mode, the UCB will not lockout 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.
SAFETY CONTROLS
The unit control board monitors the following inputs for each
cooling system:
1.
A suction line freezestat to protect against low evaporator temperatures due to a low airflow or a low return air
temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).
2.
A high-pressure switch to protect against excessive discharge 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 refrigerant charge, (opens at 7 ± 3 psig or 22 ± 5 psig).
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.
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.
COMPRESSOR PROTECTION
In addition to the external pressure snitches, the compressors 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 AntiShort Cycle Delay (ASCD) is utilized to prevent operation of
35
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 energized.
The ASCD is initiated on unit start-up and on any compressor
reset or lock-out.
Limit Setting Table 32. It resets automatically. The limit switch
operates when a high temperature condition, caused by inadequate supply air flow occurs, thus shutting down the heater
and energizing the blower.
TABLE 32: ELECTRIC HEAT LIMIT SETTING
FLASH CODES
HEATER kW
LIMIT
SWITCH
OPENS °F
7.5
9
150
RESET
7.5, 10, 12.5
18
150
Remove the call for cooling, by raising thermostat setting
higher than the conditioned space temperature. This resets
any pressure or freezestat flash codes.
7.5, 10, 12.5
24
150
7.5, 10, 12.5
34
150
10, 12.5
54
130
The UCB will initiate a flash code associated with errors
within the system. Refer to UNIT CONTROL BOARD FLASH
CODES 37.
UNIT (TONS)
ELECTRIC HEATING SEQUENCE OF OPERATIONS
The following sequence describes the operation of the electric heat section.
Two-stage heating:
a.
b.
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 heating, the UCB will energize the blower motor.
The thermostat will cycle the electric heat to satisfy
the heating requirements of the conditioned space.
ELECTRIC HEATING OPERATION ERRORS
TEMPERATURE LIMIT
If the UCB senses zero volts from the high temperature limit,
the indoor blower motor is immediately energized.
This limit is monitored regardless of unit operation status, i.e.
the limit is monitored at all times.
VOLTAGE
380
FLASH CODES
The UCB will initiate a flash code associated with errors
within the system. Refer to UNIT CONTROL BOARD FLASH
CODES Table 37.
RESET
Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature.This
resets any flash codes.
ELECTRIC HEAT ANTICTPATOR SETPOINTS
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.
TABLE 33: ELECTRIC HEAT ANTICIPATOR
SETPOINTS
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 initiated (See Table 37).
W1
W2
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
36
Unitary Products Group
035-17311-003-A-0704
START-UP (COOLING)
OPERATING INSTRUCTIONS
1.
PRESTART CHECK LIST
Turn unit electrical power on.
NOTE: Prior to each cooling season, the crankcase heaters
must be energized at least 10 hours before the system 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 to the off position.
3.
Turn unit electrical power on.
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.
2.
Measure the temperature drop across the evaporator
coil.
•
If blower rotation is in the wrong direction. Refer to
Phasing Section in general information section.
Check blower drive belt tension.
2.
Set the room thermostat setting to lower than the room
temperature.
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.
CHARGING THE UNIT
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.
These units should be charged using the superheat method.
Super heat charging data is shown in Tables 34 thru 36.
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)
55
57
59
61
63
65
67
69
71
73
75
10.6
13.5
16.3
19.1
22.0
24.8
27.7
29.1
30.5
32.0
33.4
70
8.4
11.1
13.8
16.5
19.3
22.0
24.7
26.5
28.4
30.2
32.0
75
6.1
8.7
11.3
13.9
16.6
19.2
21.8
24.0
26.2
28.4
30.6
80
-
6.4
8.9
11.4
13.9
16.3
18.8
21.4
24.0
26.6
29.2
65
85
-
-
6.4
8.8
11.1
13.5
15.9
18.9
21.9
24.8
27.8
90
-
-
5.8
7.9
10.1
12.2
14.3
17.2
20.2
23.1
26.1
95
-
-
5.3
7.1
9.0
10.8
12.7
15.6
18.5
21.5
24.4
100
-
-
-
6.3
7.7
9.0
10.4
13.5
16.6
19.7
22.8
105
-
-
-
5.5
6.4
7.3
8.1
11.4
14.6
17.9
21.2
110
-
-
-
-
5.1
5.5
5.9
9.3
12.7
16.1
19.5
115
-
-
-
-
-
-
-
7.2
10.8
14.3
17.9
Unitary Products Group
37
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)
55
57
59
61
63
65
67
69
71
73
75
65
19.6
20.8
22.0
23.2
24.4
25.6
26.9
28.4
29.9
31.4
32.9
70
14.4
16.0
17.5
19.0
20.5
22.0
23.5
25.4
27.3
29.2
31.0
75
9.3
11.1
12.9
14.7
16.6
18.4
20.2
22.4
24.7
26.9
29.1
80
-
6.3
8.4
10.5
12.6
14.8
16.9
19.5
22.0
24.6
27.2
85
-
-
-
6.3
8.7
11.1
13.6
16.5
19.4
22.4
25.3
90
-
-
-
5.6
7.8
9.9
12.0
15.0
17.9
20.8
23.7
95
-
-
-
-
6.8
8.7
10.5
13.4
16.3
19.3
22.2
100
-
-
-
-
5.3
6.7
8.1
10.8
13.5
16.2
18.9
105
-
-
-
-
-
-
5.7
8.1
10.6
13.1
15.5
110
-
-
-
-
-
-
-
5.5
7.7
10.0
12.2
115
-
-
-
-
-
-
-
-
-
6.9
8.9
TABLE 36: 12.5 TON STANDARD EFFICIENCY SUPERHEAT CHARGING
Superheat at Compressor Suction (°F)
Airflow = 5000 CFM
Outdoor
Temp (°F)
38
Indoor WB Temp (°F)
55
57
59
61
63
65
67
69
71
73
75
65
33.9
34.5
35.1
35.7
36.3
36.9
37.5
38.1
38.7
39.3
39.9
70
30.2
31.0
31.8
32.7
33.5
34.3
35.2
36.0
36.8
37.7
38.5
75
26.4
27.5
28.6
29.6
30.7
31.8
32.8
33.9
35.0
36.0
37.1
80
23.5
24.7
26.0
27.2
28.4
29.7
30.9
32.1
33.4
34.6
35.8
85
20.6
22.0
23.4
24.8
26.2
27.6
29.0
30.4
31.8
33.2
34.6
90
17.2
18.8
20.3
21.9
23.5
25.0
26.6
28.2
29.7
31.3
32.9
95
13.8
15.5
17.2
19.0
20.7
22.4
24.2
25.9
27.6
29.4
31.1
100
9.9
11.8
13.6
15.5
17.4
19.2
21.1
23.0
24.8
26.7
28.6
105
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
22.0
24.0
26.0
110
4.8
6.5
8.2
9.8
11.5
13.2
14.8
16.5
18.2
19.8
21.5
115
3.7
5.0
6.3
7.7
9.0
10.3
11.7
13.0
14.3
15.7
17.0
Unitary Products Group
035-17311-003-A-0704
NORMAL MAINTENANCE
Prior to any of the following maintenance procedures, shut off all power to the unit to prevent personal injury.
Periodic maintenance normally consists of changing or cleaning filters.
GENERAL
FILTERS
TROUBLESHOOTING
Troubleshooting of components may require opening the electrical control box with the power connected to the unit. Use extreme care when
working with live circuits! Check the unit nameplate for the correct line voltage and set the voltmeter to the correct range before making any
connections with line terminals.
When not necessary, shut off all electric power to the
unit prior to any of the following maintenance procedures so as to prevent personal injury.
Inspect once a month. Replace disposable or clean permanent type as necessary. DO NOT replace permanent type
with disposable.
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
to the condenser coils.
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.
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 structures of shrubs.
Unitary Products Group
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous operation which could cause injury to person
and/or damage unit components. Verify proper operation after servicing.
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 correctly. Do not confuse this with an error flash code. To prevent
confusion, a 1-flash, flash code is not used.
Current alarms are flashed on the UCB LED. The alarm history 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.
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.
39
035-17311-003-A-0704
TABLE 37: UNIT CONTROL BOARD FLASH CODES
Flash Code
Description
On Steady
Control Failure - Replace Control
Heart Beat
Normal Operation
1 Flash
Not Applicable
2 Flashes
Control waiting ASCD*
3 Flashes
HPS1 - Compressor Lock out
4 Flashes
HPS2 - Compressor Lock out
5 Flashes
LPS1 - Compressor Lock out
6 Flashes
LPS2 - Compressor Lock out
7 Flashes
FS1 - Compressor Lock out
8 Flashes
FS2 - Compressor Lock out
9 Flashes
Ignition Control Locked Out/
Ignition Control Failure / Limit Switch Trip / No Jumper Plug in Heat Section
Compressors Locked Out On Low
10 Flashes
Outdoor Air Temperature*
Compressors Locked Out Because The
11 Flashes
Economizer Is Using Free Cooling*
12 Flashes
Fan Overload Switch Trip - Not Applicable On This Unit *
13 Flashes
Compressor Held Off Due To Low Voltage*
14 Flashes
EEPROM Storage Failure (Control Failure)
OFF
*.
No Power or Control Failure
These flash codes do not represent alarms.
Monitored
Systems
Problem?
No
Programming?
Call for
Heating?
Yes
Yes
Program
Unit
Control
Board
Call for
Heat
Yes
Trip/Failure
No
Loss of
Call for
Heating?
No
Yes
Heat Off
No
Call for 2nd
Stage
Cooling
No
Energize ID
Blower Motor
Monitor
Call for
Cooling?
Yes
Yes
No
Yes
No
Turn off ID
Blower Motor
Yes
Fan on
>30 secs?
No
Lossof Call
for ID Blower?
Call for 1st
Stage
Cooling
Fan off
>10 secs?
Yes
Yes
No
First
Stage?
No
Call for
ID Blower?
No
Loss of Call
for Cooling?
Yes
Cool Off
FIGURE 24 - BASIC TROUBLESHOOTING FLOWCHART
40
Unitary Products Group
035-17311-003-A-0704
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 operate. If both stages of cooling are requested simultaneously 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.
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 contactor and the compressor.
3.
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.
If M1 is pulled in and voltage is supplied at M1, lightly
touch the compressor housing. If it is hot, the compressor may be off on inherent protection. Cancel any calls
for cooling and wait for the internal overload to reset.
Test again when cool.
4.
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.
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.
5.
Failing the above, if voltage is supplied at M1, M1 is
pulled in, and the compressor still does not operate,
replace the compressor.
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 is not present from the room thermostat, check
for the following:
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.
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.
5.
6.
7.
8.
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.
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 following:
a.
9.
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):
Proper operation of the room thermostat (contact
between R and G with the fan switch in the ON position and in the AUTO position during operation
calls).
b.
Proper wiring between the room thermostat and the
UCB, and
c.
Loose wiring from the room thermostat to the UCB
Unitary Products Group
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
c.
Loose wiring from the room thermostat to the UCB
8.
If 24 volts is present at the UCB Y1 terminal, the compressor 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 terminals.
9.
If 24 volts is present at the UCB Y1 terminal and none of
the protection switches have opened, the UCB may have
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 connected to the G terminal of the UCB, and for loose wiring.
10. If the thermostat and UCB are properly wired, replace
the UCB.
a.
41
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.
NOTE: While the above step will reset any lockouts, compressor #1 may be held off for the ASCD. See the
next step.
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.
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 wiring. If 24 volts is not present at the Y1 “OUT” terminal,
the UCB must be replaced.
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-NLock plug, the jumper in the Mate-N-Lock plug, and in
the wiring from the Mate-N-Lock plug to the Y1 “ECON”
terminal.
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” terminal. 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 providing 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 energizes, there is a fault in the economizer wiring or the
economizer control.
14. The UCB can be programmed to lock out compressor
operation during free cooling and in low ambient conditions. 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 terminals. If the compressor engages, the UCB has faulted.
42
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” position):
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, following a short delay, compressor #1 will be energized
unless it is locked out. Typically, compressor #2 is energized only during free cooling if the call for the second
stage of cooling persists for 20 minutes.
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 seconds to prevent a power surge. If after the delay compressor #2 does not energize on a second stage call for
cooling, check for line voltage at the compressor contactor, M2, and that the contactor is pulled in. Check for
loose wiring between the contactor and the compressor.
3.
If M2 is pulled in and voltage is supplied at M2, lightly
touch the compressor housing. If it is hot, the compressor may be off on inherent protection. Cancel any calls
for cooling and wait for the internal overload to reset.
Test again when cool.
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.
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:
8.
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
If 24 volts is present at the UCB Y2 terminal, the compressor 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 terminals.
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 cooling, i.e. a loss if 24 volts at the Y1 terminal.
8.
If 24 volts are present at the UCB Y1 terminal, the compressor 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 terminals.
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 compressor lock outs.
remove any call for cooling at the thermostat or by disconnecting 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, compressor #1 will be held off for the ASCD, and compressor #2 may be held off for a portion of the
ASCD. See the next step.
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.
11. The UCB can be programmed to lock out compressor
operation during free cooling and in low ambient conditions. 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 terminals. If the compressor engages, the UCB has faulted.
13. If none of the above correct the error, replace the UCB.
On a call for cooling, the supply air blower motor and compressor #2 are operating but compressor #1 is not (the room
thermostat fan switch is in the “AUTO” position):
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.
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 compressor may be off on inherent protection. Cancel any calls
for cooling and wait for the internal overload to reset.
Test again when cool.
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.
Unitary Products Group
NOTE: While the above step will reset any lock outs, compressor #2 will be held off for the ASCD, and compressor #1 may be held off for a portion of the
ASCD. See the next step.
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.
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 wiring. If 24 volts is not present at the Y1 “OUT” terminal,
the UCB must be replaced.
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-NLock plug, the jumper in the Mate-N-Lock plug, and in
the wiring from the Mate-N-Lock plug to the Y1 “ECON”
terminal.
For units with economizers:If 24 volts is present at the
Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON”
43
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 conditions. 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 terminals. 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.
Copyright © 2004 by Unitary Products Group. All rights reserved.
Unitary
Products
Group
035-17311-003-A-0704
Supersedes: 035-17311-002-A-0803
5005
York
Drive
Norman
OK
73069
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