York BCH 036, 048 & 060 User Manual

Page 1
INSTALLATION
SUNLINE 2000™
MANUAL
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . 4
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
REFERENCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . 4
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . 5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . 31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . 32
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SINGLE PACKAGE HEAT PUMP
BCH 036, 048 & 060
See the following page for a complete Table of Contents.
NOTES, CAUTIONS AND WARNINGS
The installer should pay particular attention to the words: NOTE, CAUTION, and WARNING. Notes clarify or make the installation easier. Cautions to prevent equipment damage. Warnings 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.
are intended to
are given
are given to
SAVE THIS MANUAL
Page 2
TABLE OF CONTENTS
177820-YIM-A-0506
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . 4
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . 5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION SAFETY INFORMATION: . . . . . . . . 5
LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RIGGING AND HANDLING . . . . . . . . . . . . . . . . . . . . 6
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CONDENSATE DRAIN . . . . . . . . . . . . . . . . . . . . . . . . 7
COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SERVICE ACCESS . . . . . . . . . . . . . . . . . . . . . . . . . . 8
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
POWER AND CONTROL WIRING . . . . . . . . . . . . . . 10
OPTIONS/ACCESSORIES . . . . . . . . . . . . . . . . . . . . 10
ELECTRIC HEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
ECONOMIZER/MOTORIZED DAMPER AND RAIN
HOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
POWER EXHAUST/BAROMETRIC RELIEF DAMPER
AND RAIN HOOD . . . . . . . . . . . . . . . . . . . . . . . . . . .11
ECONOMIZER AND POWER EXHAUST DAMPER
SET POINT ADJUSTMENTS AND INFORMATION 11
MINIMUM POSITION ADJUSTMENT . . . . . . . . . . . .12
ENTHALPY SET POINT ADJUSTMENT . . . . . . . . . .12
POWER EXHAUST DAMPER SETPOINT (WITH OR
WITHOUT POWER EXHAUST) . . . . . . . . . . . . . . . .12
PHASING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SUPPLY AIR BLOWERS . . . . . . . . . . . . . . . . . . . . . 26
CHECKING SUPPLY AIR CFM . . . . . . . . . . . . . . . . 26
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SEQUENCE OF OPERATIONS OVERVIEW . . . . . . 27
COOLING SEQUENCE OF OPERATION . . . . . . . . 27
CONTINUOUS BLOWER . . . . . . . . . . . . . . . . . . . . . . 27
INTERMITTENT BLOWER . . . . . . . . . . . . . . . . . . . . 28
NO OUTDOOR AIR OPTIONS . . . . . . . . . . . . . . . . . 28
ECONOMIZER WITH SINGLE ENTHALPY
SENSOR - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
ECONOMIZER WITH DUAL ENTHALPY
SENSORS - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
ECONOMIZER (SINGLE OR DUAL) WITH POWER
EXHAUST - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
MOTORIZED OUTDOOR AIR DAMPERS - . . . . . . . 28
COOLING OPERATION ERRORS . . . . . . . . . . . . . 28
HIGH-PRESSURE LIMIT SWITCH . . . . . . . . . . . . . . 28
LOW-PRESSURE LIMIT SWITCH . . . . . . . . . . . . . . . 29
FREEZESTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
LOW AMBIENT COOLING . . . . . . . . . . . . . . . . . . . . . 29
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . 29
COMPRESSOR PROTECTION . . . . . . . . . . . . . . . 29
FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
HEATING SEQUENCE OF OPERATIONS . . . . . . . 30
WITH OR WITHOUT ELECTRIC HEAT . . . . . . . . . . . 30
DEFROST MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
FORCED DEFROST . . . . . . . . . . . . . . . . . . . . . . . . . 30
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . 30
HEAT ANTICIPATOR SETPOINTS . . . . . . . . . . . . . 31
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . 31
PRESTART CHECK LIST . . . . . . . . . . . . . . . . . . . . 31
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . 32
POST START CHECK LIST . . . . . . . . . . . . . . . . . . 32
SHUT DOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 32
COOLING TROUBLESHOOTING GUIDE . . . . . . . . 32
UNIT FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . 34
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . 34
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
OUTDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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177820-YIM-A-0506
LIST OF FIGURES
Fig. # Pg. #
1 RECOMMENDED DRAIN PIPING . . . . . . . . . . . . . . . . 7
2 COMPRESSOR RESTRAINING BRACKET . . . . . . . . 7
3 TYPICAL FIELD POWER & CONTROL WIRING . . . . 9
4 ENTHALPY SETPOINT ADJUSTMENT . . . . . . . . . . 12
5 HONEYWELL ECONOMIZER CONTROL
W7212 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6 FOUR AND SIX POINT LOADING . . . . . . . . . . . . . . . 13
7 UNIT DIMENSIONS (3 - 5 TON HEAT PUMP) FRONT
VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 UNIT WITH ECONOMIZER RAINHOOD . . . . . . . . . . 20
9 UNIT WITH FIXED OUTDOOR AIR/MOTORIZED
DAMPER RAINHOOD . . . . . . . . . . . . . . . . . . . . . . . . 20
10 UNIT DIMENSIONS (REAR VIEW) . . . . . . . . . . . . . . 21
11 DISCONNECT/BLOWER ACCESS LOCATION . . . . 21
12 BELT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 26
13 PRESSURE DROP ACROSS COIL . . . . . . . . . . . . . . 27
LIST OF TABLES
Tbl. # Pg. #
1 UNIT APPLICATION DATA (BCH) . . . . . . . . . . . . . . . 6
2 CONTROL WIRE SIZES . . . . . . . . . . . . . . . . . . . . . . 10
3 ELECTRIC HEATER CFM LIMITATIONS . . . . . . . . . 11
4 CENTER OF GRAVITY (ALL MODELS) . . . . . . . . . . 13
5 BCH 4 POINT LOADS WEIGHT DISTRIBUTION . . . 13 6 BCH 6 POINT LOADS WEIGHT DISTRIBUTION . . . 13
7 PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 OPERATING WEIGHTS (LBS.) . . . . . . . . . . . . . . . . . 14
9 ELECTRICAL DATA - BCH036 - 060 DIRECT
DRIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10 ELECTRICAL DATA - BCH036 - 060 BELT DRIVE . . 17
11 ELECTRIC HEAT CORRECTION FACTORS . . . . . . 19
12 VOLTAGE LIMITATIONS . . . . . . . . . . . . . . . . . . . . . 19
13 UTILITIES ENTRY . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
14 MINIMUM CLEARANCES . . . . . . . . . . . . . . . . . . . . . 21
15 SUPPLY AIR BLOWER PERFORMANCE (3 TON BELT
DRIVE) - SIDE DUCT APPLICATION . . . . . . . . . . . . 22
16 SUPPLY AIR BLOWER PERFORMANCE (4 TON BELT
DRIVE) - SIDE DUCT APPLICATION . . . . . . . . . . . . 23
17 SUPPLY AIR BLOWER PERFORMANCE (5 TON BELT
DRIVE) - SIDE DUCT APPLICATION . . . . . . . . . . . . 24
18 SUPPLY AIR BLOWER PERFORMANCE (3 - 5 TON
DIRECT DRIVE) - SIDE DUCT APPLICATION . . . . 25
19 BELT DRIVE BLOWER MOTOR AND DRIVE DATA. 25
20 STATIC RESISTANCES . . . . . . . . . . . . . . . . . . . . . . 26
21 ELECTRIC HEAT LIMIT CONTROL SETTING . . . . . 31
22 ELECTRIC HEAT ANTICIPATOR SETPOINTS . . . . 31
23 UNIT CONTROL BOARD FLASH CODES . . . . . . . . 34
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177820-YIM-A-0506

GENERAL

YORK Model BCH units are single package heat pumps. These are designed fo r outdoor installation on a rooftop or slab.
The 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, duct connec­tions, installation of fixed outdoor air intake damper (units without economizer or motorized damper option only) at the point of installation.
The supplemental field installed 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, main­tain or service this equipment.
Observe all precautions in the literature, on labels and tags accompanying the equipment whenever working on air conditioning equipment. Be sure to follow all other safety precautions that apply.
177820 -General Installation
255036 - Technical Guide

RENEWAL PARTS

Contact your local York® parts distribution center for authorized replacement parts.

APPROVALS

Design listed by CSA as follows:
For use as a heat pump only with or without optional electric heat.
For outdoor installation only.
For installation on combustible material.
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.
Wear safety glasses and work gloves, and follow all safety codes. Use a quenching cloth and have a fire extinguisher available for all 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. Refer to Form 50.15-NM for additional information.

REFERENCE

Additional information on the design, installation, oper­ation and service of this equipment is available in the following reference forms:
Improper 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.
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177820-YIM-A-0506
B 7 C H A
PRODUCT GENERATION
4 = Fourth Generation 5 = Fifth Generation 6 = Sixth Generation 7 = Seventh Generation
PRODUCT CATEGORY
B = Single Package Heat Pump
(Air Cooled)
PRODUCT IDENTIFIER
CH = Heat Pump
VOLTAGE CODE
25 = 208/230-3-60 46 = 460-3-60 58 = 575-3-60
036 = 3 Ton 048 = 4 Ton 060 = 5 Ton
30 6 2 5
FACTORY INSTALLED HEAT
A = No Supplemental Heat
NOMINAL COOLING CAPACITY

PRODUCT NOMENCLATURE

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 unit only in a location and position as specified on page 6 of these instructions.
2. This equipment is not to be used for temporary heating of buildings or structures under construc­tion.
LIMITATIONS
These units must be installed in accordance with the following national and local safety codes:
In U.S.A
National Electrical Code ANSI/NFPA No. 70.
Unitary Products Group 5
.:
In Canada
:
Current Canadian Electrical Code C22.1.
Local plumbing and waste water codes.
Other applicable local codes. Refer to the Unit Application Data Table 1 and the
Electrical Data table for the unit. If components are to be added to a unit to meet local
codes, they are to be installed at the dealer's and/or the customer's expense.
Size of unit for proposed installation should be based on heat loss/heat gain calculation made according to the methods of the Air Conditioning Contractors of America (ACCA).
This unit is not to be used for temporary heating of buildings or structures under construction.
Page 6
TABLE 1: UNIT APPLICATION DATA (BCH)
UNIT MODEL NUMBER 036 048 060
Voltage Variation,
Min. / Max.
1
Supply Air CFM, Nom. 1200 1600 2000
208/230 187 / 253
460 414 / 506 575 518 / 630
177820-YIM-A-0506
Wet Bulb Temper ature (ºF) of Air on
Evaporator Coil, Min. / Max
Dry Bulb Temperature (ºF) of Air on
Condenser Coil, Min. / Max.
1.
Utilization range “A” in accordance with ARI Standard 110.
LOCATION
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.
3. Where a choice of location is possible, position the unit on either north or east side of building.
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 and/or accessories. Unit must be installed on a solid level roof curb or appropriate angle iron frame.
6. Maintain level tolerance to 1/2 inch maximum across the entire length or width of the unit.
If a unit is to be installed on a roof curb or special frame other than a YORK roof curb, gasketing must be applied to all surfaces that come in contact with the unit underside.
57 / 72
0 / 120
Units may also be moved or lifted with a forklift. Slotted openings in the base rails are provided for this pur­pose. Fork lengths must be a minimum of 42 inches.
Remove the nesting brackets fr om the four corners on the top of the unit. All screws that are removed when removing the brackets must be replaced on the unit.
Refer to Table 8 for unit weights and to the Figure 6 for approximate center of gravity.
Before lifting a unit, make sure that all panels are in place and that its weight is distributed equally on all cables so it will lift evenly.
CLEARANCES
All units require certain clearances for proper operation and service. Installer must make provisions for ade­quate ventilation air. Refer to Dimensions and Clear­ances shown in Figures 7 through 10 and Table 14 for the clearances required for combustible construction, servicing, and proper unit operation.
RIGGING AND HANDLING
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.
6 Unitary Products Group
Do not permit overhanging structures or shrubs to obstruct outdoor air discharge outlet, com­bustion air inlet or vent outlets.
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177820-YIM-A-0506
DUCTWORK
Ductwork should be designed and sized according to the methods in Manual Q of the A ir Conditioning Con­tractors of America (ACCA).
A closed return duct system shall be used. This shall 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 requirements of the job. They should NOT be sized to match the dimen­sions of the duct connections on the unit.
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 waterproofed.
Refer to Figures 7 and 10 for information concerning side and bottom supply and return air duct openings.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the one-inch NPT female connection on the unit to an open drain.
NOTE: The condensate drain operates in a negative
pressure in the cabinet. The condensate drain line MUST be trapped to provide proper drain­age. See Figure 1.
FIGURE 1 - RECOMMENDED DRAIN PIPING
COMPRESSORS
Units are shipped with compressor mountings factory­adjusted and ready for operation.
Units with scroll compressors have a shipping bracket which must be removed after the unit is set in place. See Figure 2.
Compressor
Mounting bracket
base
Remove these
screws (2)
Mounting bracket
top (remove)
Wire tie
(cut and remove)
FIGURE 2 - COMPRESSOR RESTRAINING
BRACKET
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Compressor compartment
Electric Heat compartment
177820-YIM-A-0506
Do not loosen compressor mounting bolts.
FILTERS
One-inch or two-inch filters can be supplied with each unit. Filters must always be installed ahead of the evaporator coil and must be kept clean or replace d with same size and type. Dirty filters will reduce the capacity of the unit and will result in frosted c oils or safety sh ut­down. Minimum filter area and required sizes are shown in Physical Data Table 7.
SERVICE ACCESS
The following removable panels provide access to all serviceable components:
Blower compartment
Main control box
Filter compartment Refer to the Dimensions and Clearances shown in Fig-
ures 7 and 11 for location of these access panels.
Make sure that all screws and panel latches are replaced and properly positioned on the unit to maintain an airtight seal.
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177820-YIM-A-0506
RH
RC
Y
W
G
R
Y1
W1
C
G
ADD
JUMPER
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE). TO CONTROL THE ECONOMIZER ON SECOND STAGE COOLING, USE THERMOSTAT 2TH04700224.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
SINGLE STAGE
TYPICAL POWER WIRING
REFER TO THE ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, OVERCURRENT PROTEC­TION AND WIRING.
TYPICAL CONTROL WIRING
COOLING / HEATING (24 VOLT THERMOSTAT)
1
UNIT TERMINAL
STRIP TB1
R
ADD
JUMPER
THERMOSTAT
TERMINALS
RH
RC
COOLING / HEATING (ELECTRONIC THERMOSTAT)
MULTI STAGE
RC
RH
Y1
Y2
W1
W2
G
B
LED 1
LED 2
COM
A1
A2
T
T
1
UNIT TERMINAL
STRIP TB1
2
3
NOT USED
4
TO REMOTE SENSOR 2TH040702224 IF USED
THERMOSTAT
TERMINALS
ADD
JUMPER
4
ADD
JUMPER
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE).
2
FIGURE 3 - TYPICAL FIELD POWER & CONTROL WIRING
SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
3
SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
ELECTRIC HEATER.
4
REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 ANDA2 PROVIDE A RELAY OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE THERMOSTAT SWITCHES TO THE SET-BACK POSITION.
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Y
W
G
1
24 VOLT THERMOSTAT 2ET07701024. TO CONTROL THE ECONOMIZER ON THE SECOND STAGE COOLING OR TO HAVE AN ELECTRIC HEAT ACCESSORY WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH0471024.
24 VOLT
TRANSFORMER
W1
W2
OCC
R
Y1
Y2
G
C
X
Y1
W1
W2
24 VOLT
Y2
G
C
TRANSFORMER
Page 10
THERMOSTAT
The room 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 the thermostat for general installation procedure. A minimum of seven color-coded insulated wires (#18 AWG) should be used to connect the thermostat to the unit.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the National Electrical Code, ANSI / NFPA No. 70 (in U.S.A.), current Canadian Electrical Code C22.1 (in Canada) 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 the Unit Applica­tion Data table.
The internal wiring harness furnished with this unit is an integral part of a CSA design certified unit. Field alteration to comply with electrical codes should not be required.
A fused disconnect switch should be field provided for the unit. The switch must be separate from all other cir­cuits. Wire entry at knockout openings require conduit fittings to comply with NEC (in U.S.A.), CEC (in Can­ada) and/or local codes. 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.
Use copper conductors properly sized to carry the load. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.
177820-YIM-A-0506
When connecting electrical power and control wiring to the unit, waterproof type connectors MUST BE USED so that water or moisture cannot be drawn into the unit during normal operation. The above waterproofing conditions will also apply when installing a field-supplied disconnect switch.
Refer to the Typical Field Wiring Figure 3 and to the appropriate unit wiring diagram for control circuit and power wiring information.
TABLE 2: CONTROL WIRE SIZES
Wire Size
18 AWG 150 Feet
1.
From the unit to the thermostat and back to the unit.
Maximum Length
1
OPTIONS/ACCESSORIES

ELECTRIC HEAT

The field-installed heaters are wired for single point power supply. Power supply need only be brought into the single point terminal block and thermostat wiring to the low voltage terminal strip located in the upper por­tion of the unit control box.
These CSA approved heaters are located within the central compartment of the unit with the heater ele­ments extending into the supply air chamber. Refer to Figure 7 for access panel location.
Fuses are supplied, where required, by the factory. Some KW sizes require fuses and others do not. Refer to Table 3 for minimum CFM limitations and to Tables 9 and 10 for electrical data.
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177820-YIM-A-0506
TABLE 3: ELECTRIC HEATER CFM LIMITATIONS
UNITMODEL SIZE NOMINAL
TONS
3
4
5
VOLTAGE
208/230-3-60 1100 1100 1200 1200 1300 -
460-3-60 - 1100 1200 1200 1300 ­575-3-60 - - 1200 1200 1300 -
208/230-3-60 1300 1300 1300 1300 1300 -
460-3-60 - 1300 1300 1300 1300 ­575-3-60 - - 1300 1300 1400 -
208/230-3-60 1600 1600 1600 1600 1600 1600
460-3-60 1600 1600 1600 1600 1600 1600 575-3-60 - 1600 1600 1600 1600 1800
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
5 7 10 15 20 30

ECONOMIZER/MOTORIZED DAMPER AND RAIN HOOD

The instruction for the optional economizer/motorized damper and rain hood can be found in form 035­07364-000. Use these instructions when field assem­bling an economizer rain hood onto a unit. The outdoor and return air dampers, the damper actuator, the damper linkage, the outdoor and return air divider baf­fles, and all the control sensors are factory mounted as part of the “Factory installed” economizer/motorized damper options.

POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND RAIN HOOD

The instructions for the power exhaust/barometric relief damper and rain hood can be found in form 530.18­N1.10V.
All of the components, including the dampers, hard­ware, and mounting instructions are shipped in a single package external from the unit and must be field assembled and installed.
Power exhaust is only available as a field installed accessory.
ECONOMIZER AND POWER EXHAUST DAMPER SET POINT ADJUSTMENTS AND INFORMATION
Remove the economizer access panel from the unit. Loosen but do not remove the two panel latches. Locate the economizer control module, where the fol­lowing adjustments will be made.
Extreme care must be exercised in turning all setpoint, maximum, and minimum damper positioning adjustment screws to prevent twist­ing them off.
Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjusting screw (found on the damper control module) fully clockwise and then set the thermostat indoor fan switch to the on position and then off, or energize and de­energize terminals “R” to “G”.
Unitary Products Group 11
Page 12

MINIMUM POSITION ADJUSTMENT

40 (4)
70
(21)
50
(10)
55
(13)
60
(16)
65
(18)
35 (2)
45 (7)
75
(24)
80
(27)
35 (2)
40
(4)45(7)
50
(10)55(13)
60
(16)
65
(18)
70
(21)
75
(24)80(27)
85
(29)
85
(29)
90
(32)
90
(32)
105 (41)
110 (43)
100 (38)95(35)
95
(35)
100 (38)
105 (41)
110 (43)
APPROXIMATE DRY BULB TEMPERATURE - 0F (0C)
D
D
C
C
B
B
A
A
CONTROL
CURVE
CONTROL POINT
APPROX.
0
F (0C)
AT 50% RH
A
D
C
B
63 (17)
73 (23)
70 (21) 67 (19)
N1
N
P1
P
EXH
Set
EXH
Min
Pos
IAQ
Max
IAQ
IAQ Min
Free Cool
T
T1
AQ1 AQ
SO+ SO
SR+
SR
A
BC
D
TR TR1
24
Vac
HOT
24
Vac
COM
EF EF1
2
3
4
5
1
+
Exhaust Air Adjustment
Screw
Exhaust Air LED
Damper Min.
Position
Screw
Indoor Air Quality
Max. Adjustment
Screw
Indoor Air Quality
LED
Indoor Air Quality
Min. Adjustment
Screw
Free Cooling LED
Economizer Enthalpy Set Point Adjustment
Screw
With thermostat set to 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.

ENTHALPY SET POINT ADJUSTMENT

The enthalpy setpoint may now be set by selecting the desired setpoint shown in the Enthalpy Setpoint Adjust­ment Figure 4. Adjust as follows:
For a single enthalpy operation carefully turn the setpoint adjusting screw (found on the damper control module) to the “A”, “B”, “C” or “D” setting corresponding to the lettered curve of the Enthalpy Setpoint Adjustment Figure 4.
For a dual enthalpy operation, carefully turn the setpoint adjusting screw fully clockwise past the “D” setting.
177820-YIM-A-0506
FIGURE 4 - ENTHALPY SETPOINT ADJUSTMENT
POWER EXHAUST DAMPER SETPOINT (WITH OR WITH­OUT POWER EXHAUST)
With no power exhaust option, adjust the Exha u st
With power exhaust option, each building pressur-
12 Unitary Products Group
Air Adjustment Screw fully clockwise.
ization 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.
FIGURE 5 - HONEYWELL ECONOMIZER CONTROL
W7212
Page 13
177820-YIM-A-0506
447/
8
A
BACK OF UNIT
821/
4
D
X
APPROXIMATE CENTER OF GRAVITY
FRONT OF UNIT
C
B
CONDENSER COIL
Y
END OF UNIT
FIGURE 6 - FOUR AND SIX POINT LOADING
TABLE 4: CENTER OF GRAVITY (ALL MODELS)
DIMENSION 3 - 5 TON
X 40-¾” Y 19-¾”
TABLE 5: BCH 4 POINT LOADS WEIGHT DISTRIBUTION
UNIT TOTALABCD BCH036 BCH048
BCH060
628 139 137 174 177 668 148 146 185 189
693 154 151 192 196
447/
8
F
X
APPROXIMATE CENTER OF GRAVITY
A
FRONT OF UNIT
BACK OF UNIT
821/
4
B
E
D
C
CONDENSER COIL
Y
END OF UNIT
TABLE 6: BCH 6 POINT LOADS WEIGHT DISTRIBUTION
UNIT TOTAL A B C D E F BCH036 BCH048
BCH060
628939291116117119 668 99 98 97 123 125 126
693 103 102 100 128 129 131
Unitary Products Group 13
Page 14
TABLE 7: PHYSICAL DATA
EVAPORATOR
BLOWER
EVAPORATOR
COIL
CONDENSER
FANS
CONDENSER
COILS
COMPRESSOR
(Qty. Per Unit)
AIR
FILTERS
CHARGE
177820-YIM-A-0506
MODELS
Centrifugal Blower (Dia. x Wd. in.) 12 X 10 12 X 10 12 X 10
Fan Motor HP (Direct Drive) 1/2 3/4 1
Fan Motor HP (Belt Drive) 1 1/2 1 1/2 1 1/2
Rows Deep 4 3 3
Fins Per Inch 16 15 15
Face Area (Sq. Ft.) 4.3 5.1 5.1
Propeller Dia. (in.) 22 22 24
Fan Motor Hp 1/3 1/2 1/2
Nom. CFM 4300 4200 4500
Rows Deep 1 1 1
Fins Per Inch 20 20 20
Face Area (Sq. Ft.) 17.1 17.1 17.1 Reciprocating Type 1 1 1
Quantity Per Unit (15” X 20” X 1” or 2“) 2 2 2 Quantity Per Unit (14” X 25” X 1” or 2“) 1 1 1
Total Face Area (sq. ft.) 6.6 6.6 6.6
Refrigerant 22
(lbs./oz.)
036 048 060
7/12 9/2 8/4
BCH
TABLE 8: OPERATING WEIGHTS (LBS.)
MODEL SIZE 3 TON 4 TON 5 TON
BASIC UNIT
OPTIONS
OR
ACCY.
Electric Heater
Barometric Relief / Fixed Air Damper 10
BCH 628 668 693
Economizer 50
Motorized Damper 26
5 - 7 kW 18 10 - 15 kW 23 20 - 30 kW 28
Roof Curb 92
Belt-Drive Blower 5
14 Unitary Products Group
Page 15
177820-YIM-A-0506
TABLE 9: ELECTRICAL DATA - BCH036 - 060 DIRECT DRIVE
MODEL VOLTAGE
208-3-60 11.9 85.0 1.7 4.4
230-3-60 11.9 85.0 1.7 4.4
BCH036
460-3-60 5.9 42.0 1.0 2.2
575-3-60 4.8 34.0 1.0 2.2
208-3-60 14.7 130.0 2.3 5.0
230-3-60 14.7 130 2.3 5.0
BCH048
460-3-60 7.7 64.0 1.3 2.2
575-3-60 6.4 52.0 1.3 2.2
COMPRESSORS
RLA
EACH
LRA
EACH
OD FAN MOTOR
FLA
ID
BLOWER
MOTOR
FLA
ELECTRIC HEATER
MODEL NO.
None -- -- 21.0 30 2CE04510525 2CE04510725
2CE04511025 8.0 22.2 48.7 50 2CE04511525 11.9 33.0 62.3 70 2CE04512025 15.9 44.1 76.1 80
None -- -- 21.0 30 2CE04510525 2CE04510725
2CE04511025 10.6 25.5 52.8 60 2CE04511525 15.9 38.2 68.8 70 2CE04512025 21.2 51.0 84.7 90
None -- -- 10.6 15 2CE04510746 2CE04511046 2CE04511546 2CE04512046
None -- -- 8.6 15
2CE04511058 10.6 10.2 21.3 25 2CE04511558 15.9 15.3 27.7 30 2CE04512058 21.2 20.4 34.1 35
None -- -- 25.7 35 2CE04510525 2CE04510725
2CE04511025 8.0 22.2 53.4 60 2CE04511525 11.9 33.0 67.0 70 2CE04512025 15.9 44.1 80.8 90
None -- -- 25.7 35 2CE04510525 2CE04510725
2CE04511025 10.6 25.5 57.5 60 2CE04511525 15.9 38.2 73.5 80 2CE04512025 21.2 51.0 89.4 90
None -- -- 13.1 20 2CE04510746 2CE04511046 2CE04511546 2CE04512046
None -- -- 10.8 15
2CE04511058 10.6 10.2 23.5 25 2CE04511558 15.9 15.3 29.9 30 2CE04512058 21.2 20.4 36.3 40
HEATERKWHEATER
2 2
2 2
2 2 2 2
2 2
2 2
2 2 2 2
AMPS
MIN.
CIRCUIT
AMPACITY
(AMPS)
MAX. FUSE/
BRKR
SIZE
(AMPS)
4.0 11.1 34.9 40
5.6 15.5 40.4 45
5.3 12.7 36.9 45
7.5 18.0 43.5 50
6.8 8.2 20.8 25
10.1 12.1 25.8 30
13.6 16.4 31.0 35
19.5 23.5 39.9 40
4.0 11.1 39.6 50
5.6 15.5 45.1 50
5.3 12.7 41.6 50
7.5 18.0 48.2 50
6.8 8.2 23.3 25
10.1 12.1 28.3 30
13.6 16.4 33.6 35
19.5 23.5 42.4 45
1
Unitary Products Group 15
Page 16
TABLE 9: ELECTRICAL DATA - BCH036 - 060 DIRECT DRIVE (CONT.)
MODEL VOLTAGE
COMPRESSORS
RLA
EACH
LRA
EACH
OD FAN MOTOR
FLA
208-3-60 19.3 137.0 2.3 6.6
230-3-60 19.3 137.0 2.3 6.6
BCH060
460-3-60 10.0 62.0 1.3 3.3
575-3-60 7.9 50.0 1.3 3.3
1.
HACR Type per NEC.
2.
These electric heaters do not include a fuse box. If a fuse box is required to meet a local code (i.e. Chicago), the fuse block accessories 2FB04700825 and 2FB04700846 are available for field installation.
ID
BLOWER
MOTOR
FLA
ELECTRIC HEATER
MODEL NO.
None -- -- 33.0 45 2CE04510525 2CE04510725
2 2
2CE04511025 8.0 22.2 60.8 70 2CE04511525 11.9 33.0 74.3 80 2CE04512025 15.9 44.1 88.2 90 2CE04513025 22.2 61.6 110.1 125
None -- -- 33.0 45 2CE04510525 2CE04510725
2 2
2CE04511025 10.6 25.5 64.9 70 2CE04511525 15.9 38.2 80.8 90 2CE04512025 21.2 51.0 96.8 100 2CE04513025 29.6 71.2 122.0 125
None -- -- 17.1 25 2CE04510746 2CE04511046 2CE04511546 2CE04512046 2CE04513046
2 2 2 2 2
None -- -- 13.5 20
2CE04511058 10.6 10.2 26.2 30 2CE04511558 15.9 15.3 32.6 35 2CE04512058 21.2 20.4 39.0 40 2CE04513058 30.4 29.3 50.1 60
177820-YIM-A-0506
HEATERKWHEATER
AMPS
MIN.
CIRCUIT
AMPACITY
(AMPS)
4.0 11.1 46.9 60
5.6 15.5 52.5 60
5.3 12.7 49.0 60
7.5 18.0 55.6 70
6.8 8.2 27.3 35
10.1 12.1 32.3 35
13.6 16.4 37.5 40
19.5 23.5 46.4 50
28.8 34.6 60.4 70
MAX. FUSE/
BRKR
SIZE
(AMPS)
1
16 Unitary Products Group
Page 17
177820-YIM-A-0506
TABLE 10: ELECTRICAL DATA - BCH036 - 060 BELT DRIVE
MODEL VOLTAGE
208-3-60 11.9 85.0 1.7 5.2
230-3-60 11.9 85.0 1.7 5.2
BCH036
460-3-60 5.9 42.0 1.0 2.6
575-3-60 4.8 34.0 1.0 2.0
208-3-60 14.7 130.0 2.3 5.2
230-3-60 14.7 130 2.3 5.2
BCH048
460-3-60 7.7 64.0 1.3 2.6
575-3-60 6.4 52.0 1.3 2.0
COMPRESSORS
RLA
EACH
LRA
EACH
OD FAN MOTOR
FLA
ID
BLOWER
MOTOR
FLA
ELECTRIC HEATER
MODEL NO.
None -- -- 21.8 30 2CE04510525 2CE04510725
2CE04511025 8.0 22.2 49.5 50 2CE04511525 11.9 33.0 63.1 70 2CE04512025 15.9 44.1 76.9 80
None -- -- 21.8 30 2CE04510525 2CE04510725
2CE04511025 10.6 25.5 53.6 60 2CE04511525 15.9 38.2 69.6 70 2CE04512025 21.2 51.0 85.5 90
None -- -- 11.0 15 2CE04510746 2CE04511046 2CE04511546 2CE04512046
None -- -- 8.8 15
2CE04511058 10.6 10.2 21.5 25 2CE04511558 15.9 15.3 27.9 30 2CE04512058 21.2 20.4 34.3 35
None -- -- 25.9 35 2CE04510525 2CE04510725
2CE04511025 8.0 22.2 53.6 60 2CE04511525 11.9 33.0 67.2 70 2CE04512025 15.9 44.1 81.0 90
None -- -- 25.9 35 2CE04510525 2CE04510725
2CE04511025 10.6 25.5 57.7 60 2CE04511525 15.9 38.2 73.7 80 2CE04512025 21.2 51.0 89.6 90
None -- -- 13.5 20 2CE04510746 2CE04511046 2CE04511546 2CE04512046
None -- -- 11.0 15
2CE04511058 10.6 10.2 23.8 25 2CE04511558 15.9 15.3 30.2 35 2CE04512058 21.2 20.4 36.5 40
HEATERKWHEATER
2 2
2 2
2 2 2 2
2 2
2 2
2 2 2 2
AMPS
MIN.
CIRCUIT
AMPACITY
(AMPS)
MAX. FUSE/
BRKR
SIZE
(AMPS)
4.0 11.1 35.7 40
5.6 15.5 41.2 45
5.3 12.7 37.7 45
7.5 18.0 44.3 50
6.8 8.2 21.2 25
10.1 12.1 26.2 30
13.6 16.4 31.4 35
19.5 23.5 40.3 45
4.0 11.1 39.8 50
5.6 15.5 45.3 50
5.3 12.7 41.8 50
7.5 18.0 48.4 50
6.8 8.2 23.7 25
10.1 12.1 28.7 30
13.6 16.4 34.0 35
19.5 23.5 42.8 45
1
Unitary Products Group 17
Page 18
TABLE 10: ELECTRICAL DATA - BCH036 - 060 BELT DRIVE (CONT.)
MODEL VOLTAGE
COMPRESSORS
RLA
EACH
LRA
EACH
OD FAN MOTOR
FLA
208-3-60 19.3 137.0 2.3 5.2
230-3-60 19.3 137.0 2.3 5.2
BCH060
460-3-60 10.0 62.0 1.3 2.6
575-3-60 7.9 50.0 1.3 2.0
1.
HACR Type per NEC.
2.
These electric heaters do not include a fuse box. If a fuse box is required to meet a local code (i.e. Chicago), the fuse block accessories 2FB04700825 and 2FB04700846 are available for field installation.
ID
BLOWER
MOTOR
FLA
ELECTRIC HEATER
MODEL NO.
None -- -- 31.6 40 2CE04510525 2CE04510725
2 2
2CE04511025 8.0 22.2 59.4 70 2CE04511525 11.9 33.0 72.9 80 2CE04512025 15.9 44.1 86.8 90 2CE04513025 22.2 61.6 108.7 110
None -- -- 31.6 40 2CE04510525 2CE04510725
2 2
2CE04511025 10.6 25.5 63.5 70 2CE04511525 15.9 38.2 79.4 80 2CE04512025 21.2 51.0 95.4 100 2CE04513025 29.6 71.2 120.6 125
None -- -- 16.4 25 2CE04510746 2CE04511046 2CE04511546 2CE04512046 2CE04513046
2 2 2 2 2
None -- -- 12.9 20
2CE04511058 10.6 10.2 25.6 30 2CE04511558 15.9 15.3 32.0 35 2CE04512058 21.2 20.4 38.4 40 2CE04513058 30.4 29.3 49.4 50
177820-YIM-A-0506
HEATERKWHEATER
AMPS
MIN.
CIRCUIT
AMPACITY
(AMPS)
4.0 11.1 45.5 60
5.6 15.5 51.1 60
5.3 12.7 47.6 60
7.5 18.0 54.2 60
6.8 8.2 26.6 30
10.1 12.1 31.6 35
13.6 16.4 36.8 40
19.5 23.5 45.7 50
28.8 34.6 59.7 60
MAX. FUSE/
BRKR
SIZE
(AMPS)
1
18 Unitary Products Group
Page 19
177820-YIM-A-0506
TABLE 11: ELECTRIC HEAT CORRECTION
FACTORS
NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER
208 240 480 600
208 0.75 230 0.92 460 0.92 575 0.92
TABLE 12: VOLTAGE LIMITATIONS
POWER SUPPLY
208/230-3-60
460-3-60 575-3-60
1.
Utilization Range “A” in accordance with ARI Standard
110.
MIN. MAX.
187 253 414 506
518 630
VOLTAGE
1
FIGURE 7: UNIT DIMENSIONS (3 - 5 TON HEAT PUMP) FRONT VIEW
Unitary Products Group 19
Page 20
FIGURE 8 - UNIT WITH ECONOMIZER RAINHOOD
177820-YIM-A-0506
DETAIL “A”
DETAIL “B”
FIGURE 9 - UNIT WITH FIXED OUTDOOR AIR/MOTORIZED DAMPER RAINHOOD
20 Unitary Products Group
Page 21
177820-YIM-A-0506
FIGURE 10 - UNIT DIMENSIONS (REAR VIEW)
FILTER ACCESS
BLOWER MOTOR ACCESS
DOT PLUGS
FIELD-SUPPLIED DISCONNECT SWITCH LOCATION
MOUNTING BRACKET FOR DICONNECT SWITCH (Shipped attached to the
blower housing inside the blower compartment)
DISCONNECT SWITCH LOCATION
AND MOTOR ACCESS PANEL FOR
UNIT WITH “BELT-DRIVE” OPTION
A,B WIRING ENTRY (See Detail “B”)
CONTROL BOX ACCESS
FIGURE 11 - DISCONNECT/BLOWER ACCESS
LOCATION
TABLE 14: MINIMUM CLEARANCES
LOCATION
Front
Rear
Left Side (Filter Access)
Right Side (Cond. Coil)
Below Unit Above Unit
1.
Units may be installed on combustible floors made
1
2
from wood or class A, B, or C roof covering material.
2.
Units must be installed outdoors. Overhanging struc­tures or shrubs should not obstruct condenser air dis­charge outlet.
CLEARANCE
24” (Cooling/Electric Heat)
32” (Gas Heat)
12” (Less Economizer)
36” (With Economizer or Fixed
Air/Motorized Damper) 24” (Less Economizer)
36” (With Economizer)
Condenser Air Discharge)
24”
0”
72” (For
TABLE 13: UTILITIES ENTRY
HOLE OPENING SIZE (DIA.) USED FOR
A
B C
D
1.
Opening in the bottom to the unit can be located by the
1
7/8” KO
2” KO
1
Control Wiring
Power Wiring
1-5/8” KO Gas Piping (Front) 1-1/2” KO
Gas Piping (Bottom)
side in the insulation.
2.
Do not remove the 2” knockout ring.
Unitary Products Group 21
Side
2
Bottom
Side
Bottom
Page 22
177820-YIM-A-0506
TABLE 15: SUPPLY AIR BLOWER PERFORMANCE (3 TON BELT DRIVE) - SIDE DUCT APPLICATION
UNIT
TONNAGE
1, 2
3
UNIT
TONNAGE
1, 2
3
AIR
FLOW
CFM
2000 843 860 880 925 919 1005 956 1065 993 1145 1030 1195 1067 1235
1900 817 775 854 850 893 920 930 995 970 1065 1008 1125 1046 1170
1800 790 700 828 760 867 840 906 905 944 980 985 1040 1025 1100
1700 - - 802 670 840 745 881 815 920 900 961 970 1001 1030
1600 ----818665858740898820940890980950
1500 ------842695882755922835962895
1400 ------833650867705904765942820
1300 --------858665893725932785
1200 --------847640880680916730
AIR
FLOW
CFM
2000 1103 1270 ------------
1900 1085 1210 ------------
1800 1064 1145 1102 1180 ----------
1700 1040 1075 1081 1115 1121 1140 --------
1600 1020 1005 1060 1050 1100 1085 --------
1500 1003 945 1044 995 1086 1035 --------
1400 982 880 1024 920 1067 965 1107 1000 ------
1300 970 835 1010 870 1053 920 1099 960 ------
1200 953 780 992 815 1034 855 1080 905 ------
1. 230/460/575 Volts
2. For 208 Volts multiply values by 0.95.
3. Includes allowances for a wet evaporator coil and 1” filters. Refer to STATIC RESISTANCE Table for resistance values on applications other than side duct airflows.
0.20 0.30 0.40 0.50
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
0.90 1.00 1.10 1.20 1.30 1.40 1.50
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
3
0.60 0.70 0.80
3
22 Unitary Products Group
Page 23
177820-YIM-A-0506
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
2000 843 860 880 925 919 1005 956 1065 993 1145 1030 1195 1067 1235
1900 817 775 854 850 893 920 930 995 970 1065 1008 1125 1046 1170
1800 790 700 828 760 867 840 906 905 944 980 985 1040 1025 1100
1700 - - 802 670 840 745 881 815 920 900 961 970 1001 1030
1600 ----818665858740898820940890980950
1500 ------842695882755922835962895
1400 ------833650867705904765942820
1300 --------858665893725932785
1200 --------847640880680916730
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
2000 1103 1270 ------------
1900 1085 1210 ------------
1800 1064 1145 1102 1180 ----------
1700 1040 1075 1081 1115 1121 1140 --------
1600 1020 1005 1060 1050 1100 1085 --------
1500 1003 945 1044 995 1086 1035 --------
1400 982 880 1024 920 1067 965 1107 1000 ------
1300 970 835 1010 870 1053 920 1099 960 ------
1200 953 780 992 815 1034 855 1080 905 ------
4
1, 2
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
3
0.90 1.00 1.10 1.20 1.30 1.40 1.50
UNIT
TONNAGE
AIR
FLOW
CFM
4
1, 2
UNIT
TONNAGE
AIR
FLOW
CFM
0.60 0.70 0.80
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
3
0.20 0.30 0.40 0.50
1. 230/460/575 Volts
2. For 208 Volts multiply values by 0.95.
3. Includes allowances for a wet evaporator coil and 1” filters. Refer to STATIC RESISTANCE Table for resistance values on applications other than side duct airflows.
TABLE 16: SUPPLY AIR BLOWER PERFORMANCE (4 TON BELT DRIVE) - SIDE DUCT APPLICATION
Unitary Products Group 23
Page 24
177820-YIM-A-0506
TABLE 17: SUPPLY AIR BLOWER PERFORMANCE (5 TON BELT DRIVE) - SIDE DUCT APPLICATION
UNIT
TONNAGE
1, 2
5
UNIT
TONNAGE
1, 2
5
AIR
FLOW
CFM
2500 1059 1560 1077 1590 1095 1630 1114 1650 1134 1660 1158 1685 1181 1720
2400 1032 1405 1054 1470 1074 1525 1094 1560 1116 1595 1140 1620 1167 1640
2300 1005 1260 1024 1275 1049 1370 1069 1440 1090 1475 1116 1505 1142 1535
2200 980 1160 1002 1170 1022 1190 1044 1250 1066 1350 1090 1410 1117 1440
2100 930 1060 957 1070 983 1080 1010 1100 1039 1160 1064 1260 1092 1340
2000 877 950 908 975 941 1000 976 1020 1009 1050 1040 1100 1070 1225
1900 ----8948859409409809801014 1020 1047 1095
1800 ----8558159038609509059889401022 970
1700 ------8848159258509648801001 910
1600 ------864770908805948835987870
1500 --------882740926780965830
AIR
FLOW
CFM
2500 --------------
2400 1193 1665 ------------
2300 1170 1580 1202 1620 ----------
2200 1148 1480 1180 1530 ----------
2100 1121 1385 1155 1425 1190 1475 --------
2000 1100 1285 1133 1340 1169 1385 1205 1445 ------
1900 1079 1180 1110 1240 1143 1280 1178 1330 1222 1375 ----
1800 1058 1060 1090 1135 1122 1190 1158 1240 1196 1295 ----
1700 1035 960 1071 1030 1103 1100 1134 1140 1164 1175 1197 1205 - -
1600 1020 900 1056 965 1088 1035 1118 1065 1145 1105 1170 1130 1198 1150
1500 1004 860 1038 880 1070 925 1101 980 1130 1045 1158 1075 1184 1110
1. 230/460/575 Volts
2. For 208 Volts multiply values by 0.95.
3. Includes allowances for a wet evaporator coil and 1” filters. Refer to STATIC RESISTANCE Table for resistance values on applications other than side duct airflows.
0.20 0.30 0.40 0.50
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
0.90 1.00 1.10 1.20 1.30 1.40 1.50
RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS RPM WATTS
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
3
0.60 0.70 0.80
3
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TABLE 18: SUPPLY AIR BLOWER PERFORMANCE (3 - 5 TON DIRECT DRIVE) - SIDE DUCT APPLICATION
UNIT
TONNAGE
1
3
MOTOR SPEED
HI
MED
LOW
1
4
HI
MED
LOW
1
5
HI
MED
LOW
UNIT
TONNAGE
1
3
MOTOR SPEED
HI
MED
LOW
1
4
HI
MED
LOW
1
5
HI
MED
LOW
1. Side Duct application (230/460/575 Volts)
2. Includes allowances for a wet evaporator coil
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
2
0.600.20 0.30 0.40 0.50
CFM WATTS CFM WATTS CFM WATTS CFM WATTS CFM WATTS
------1720 825 1665 795
1660 850 1630 820 1590 780 1550 750 1500 720
1470 750 1440 725 1410 700 1370 675 1330 650
----2000 1010 1950 975 1905 945
1810 910 1780 880 1740 850 1700 825 1665 800
1635 810 1610 780 1580 760 1555 740 1540 730
----2500 1400 2420 1350 2340 1300
2390 1350 2350 1300 2300 1255 2245 1210 2190 1165
2270 1320 2230 1270 2190 1220 2145 1170 2090 1110
2
0.70
AVAILABLE EXTERNAL STATIC PRESSURE-IWG
0.900.80 1.00
CFM WATTS CFM WATTS CFM WATTS CFM WATTS
1600 765 1540 735 1490 700 1380 670
1450 690 1400 665 1360 650 1270 610
1290 625 1250 610 1220 600 1130 560
1840 910 1770 825 1660 825 1530 775
1620 775 1560 740 1480 700 1390 660
1510 715 1460 690 1400 660 1300 615
2260 1250 2160 1190 2060 1135 1925 1065
2130 1120 2065 1075 1990 1030 1900 970
2030 1070 1960 1020 1890 970 1810 920
and 1” filters. Refer to STATIC RESISTANCES Table for resistance values.
TABLE 19: BELT DRIVE BLOWER MOTOR AND DRIVE DATA
1
MODEL
3 TON 790/1120 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 AK61 5.9 5.7 1 A36 37.3 1 4 TON 790/1120 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 AK61 5.9 5.7 1 A36 37.3 1 5 TON 850/1220 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 AK56 5.4 5.2 1 A36 37.3 1
BLOWER
SIZE
RANGE
(RPM)
1.
All motors have solid bases and are inherently protected. these motor s ca n be selecte d to o perate int o their service facto r be cau se they ar e locat ed in the moving air, upstream of any heating device.
MOTOR
HP FRAME
ADJUSTABLE MOTOR PULLEY FIXED BLOWER PULLEY
DESIG-
NATION
OUTSIDE
DIA. (IN.)
PITCH
DIA. (IN.)
BORE
(IN.)
DESIG-
NATION
OUTSIDE
DIA. (IN.)
PITCH
DIA. (IN.)
BORE
(IN.)
DESIG-
NATION
BELT
(NOTCHED)
PITCH
LENGTH
(IN.)
QTY.
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TABLE 20: STATIC RESISTANCES
e
DESCRIPTION
ECONOMIZER
ELECTRIC
HEATERS
BOTTOM DUCT CONNECTIONS
1
1. Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.
2. The pressure 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.
1, 2
5-15KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16
20-30KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20
1000 1200 1400 1600 1800 2000 2200 2400 2600
0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23
1
0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16
PHASING
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 incoming line connection phasing 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).
177820-YIM-A-0506
RESISTANCE, IWG
CFM
PROCEDURE FOR ADJUSTING BELT TENSION:
Loosen nuts (A) (top and bottom).
1. Adjust the tension by turning bolt (B).
2. Never loosen nuts (C) from each other.
3. Use a belt tension checker to apply a perpendicular force to be one belt at th
4. midpoint of the span as shown. The deflection force should be applied until a specific 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 a reference line. The recommended deflection force is as follows:
SPAN LENGTH
DEFL FORCE
Scroll compressors require proper rotation to operate correctly. Do not change the internal wiring to make the blower, condenser fans, or compressor rotate correctly. Change the incoming power to the main terminal block to obtain proper rotation.
SUPPLY AIR BLOWERS
These blowers have either 3-speed d ire ct drive m otor s, or single speed motors equipped with a belt driv e. Be lt drive units have a variable pitch motor pulley that allows the blower speed to be adjusted.
CHECKING SUPPLY AIR CFM
The RPM of the supply air blower will depend on the required CFM, the unit accessories or options and the static resistances of both the supply and the return air duct systems. With this information, the motor speed tap (direct drive) or the motor pulley number of turns open (belt drive) can be determined from the Blower Performance Data Tables.
(B)
*Never Loosen
(A)
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 re-tensioning should fall between the min. and max. deflection force values.
5. After adjusting, re-tighten nuts (A).
(C)*
FIGURE 12 - BELT ADJUSTMENT
Note the following:
1. The supply air CFM must be within the limitations shown in the Unit Application Data Table 1.
2. Pulleys can be adjusted in half turn increments.
3. The tension on the belt should be adjusted as shown in the Belt Adjustment Figure 12.
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0
0.1
0.2
0.3
0.4
0.5
1000 1500 2000 2500 3000
036
048
060
NOMINAL CFM
PRESSURE DROP (IWG)
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.
To check the supply air CFM after the initial balancing has been completed:
1. Remove the two 5/16” dot plugs from the blower motor and the filter access panels shown in Figure
11.
2. Insert at least 8" of 1/4 inch tubing into each of these holes for sufficient penetration into the air flow on both sides of the indoor coil.
NOTE: The tubes must be inserted and held in a posi-
tion perpendicular to the air flow so that veloc­ity pressure will not affect the static pressure readings.
3. Using an inclined m anometer, determine the pres­sure drop across a dry evaporator coil. Since the moisture on an evaporator coil may vary greatly, measuring the pressure drop across a wet coil under field conditions would be inaccurate. To assure a dry coil, the compressors should be deac­tivated while the test is being run.
4. Knowing the pressure drop across a dry coil, the actual CFM through the unit can be determined from the curve in Pressure Drop vs. Supply Air CFM (Figure 13).
Failure to properly adjust the total system air quantity and static pressure can result in extensive system damage.
FIGURE 13 - PRESSURE DROP ACROSS COIL

OPERATION

SEQUENCE OF OPERATIONS OVERVIEW
For these units, the thermostat makes a circuit between “R” and “Y1” for the cooling cycle.
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.
For heating, the thermostat makes a circuit between “R” and “W1”. The UCB energizes the compr essor and condenser fan allowing the unit to run in heating mode. A time / temperature control operates the defrost cycle.
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.
After readings have been obtained, remove the tubes and reinstall the two 5/16” dot plugs that were removed in Step 1.
NOTE: De-energize the compressors before taking
any test measurements to assure a dry indoor coil.
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COOLING SEQUENCE OF OPERATION

CONTINUOUS BLOWER

By setting the room thermostat fan switch to “ON,” the supply air blower will operate continuously.
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177820-YIM-A-0506

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 cooling, the low-voltage control circuit from “R” to “Y1” and “G” is completed. The compressor and condenser fan motor are ener­gized. After completing the specified f an on delay for cooling, the UCB will energize the blower motor.
Once the thermostat has been satisfied, it will de-ener­gize Y1. If the compressor has satisfied its minimum run time, the compressor and condenser fan de-ener­gize. Otherwise, the unit operates the cooling system until the minimum run time for the compressor has been completed. After the compressor de-energizes, the blower is stopped following the elapse of the fan off delay for cooling.
energized. Otherwise, the unit operates the cooling system until the minimum run times for the compressor has been completed. After the compressor de-ener­gizes, 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 min. position.

ECONOMIZER WITH DUAL ENTHALPY SENSORS -

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 retu rn 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 (SINGLE OR DUAL) WITH POWER EXHAUST -

This system operates as specified above with one addition. The power exhaust motor is energized 45 seconds after the actuator position exceeds the exhaust fan setpoint 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.
To be available, a compressor must not be locked-out due to a high or low-pressure switch or freezestat trip and the anti-short cycle delay (ASCD) must have elapsed.

ECONOMIZER WITH SINGLE ENTHALPY SENSOR -

When the room thermostat calls for cooling, the low voltage control circuit from “R” to “G” and “Y1” is com­pleted. 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 setpoint 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 setpoint, “Y1” energizes the compressor and condenser fan motor only.
Once the thermostat has been satisfied, it will de-ener­gize “Y1”. If the compressor has satisfied its minimum run time, the compressor and condenser fan are de-

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.
COOLING OPERATION ERRORS
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.

HIGH-PRESSURE LIMIT SWITCH

During cooling operation, if a high-pressure limit switch opens, the UCB will de-energize the compressor, ini­tiate the ASCD (Anti-short cycle delay), and, stop the condenser fan. If the call for cooling is still present at the conclusion of the ASCD, the UCB will re-energize the compressor.
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Should a high-pressure switch open thre e times within two hours of operation, the UCB will lock-out the com­pressor and flash a code (see Table 23).

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 de-energize the compressor, initiate the ASCD, and stop the condenser fan.
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 U CB will de-energize the compressor, initiate the ASCD, and stop the condenser fan.
If the call for cooling is still present at the conclusion of the ASCD, the UCB will re-energize the compressor.
Should a low-pressure switch open three times within one hour of operation, the UCB will lock-out the com­pressor and flash a code (see Table 23).

FREEZESTAT

During cooling operation, if a freezestat opens, the UCB will de-energize the compressor, initiate the ASCD, and stop the condenser fan. If the call for cool­ing is still present at the co nclusion of the ASCD, the UCB will re-energize the compressor.
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 compressor due to a freezestat trip. How­ever, a freezestat trip will de-energize the 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 the 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 380 ± 10 psig and resets at 300 ± 10 psig).
3. A low-pressure switch to protect against loss of refrigerant charge, (opens at 7 ± 3 psig and resets at 22 ± 5 psig).
The above pressure switches are hard-soldered to the unit. The refrigeration system is monitored and con­trolled. On any fault, the system will be affected by any safety/preventive action.
Should a freezestat open three times within two hours of operation, the UCB will lock-out the compressor and
The unit control board monitors the temperature limit switch of electric heat units.
flash a code (see Table 23).
COMPRESSOR PROTECTION

LOW AMBIENT COOLING

The compressor also has inherent (internal) protection.
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 lo w ambi­ent switch is closed and the thermostat is calling for cooling, the UCB will operate in the low ambient mode.
If there is an abnormal temper ature rise in a compres­sor, the protector will open to shut down the compres­sor. The UCB incorporates features to minimize compressor wear and damage. An anti-short cycle delay (ASCD) is utilized to prevent operation of a com­pressor too soon after its previous run. Additionally, a
Low ambient mode operates the compressors in this manner: 10 minutes on, 5 minutes off. The indoor
minimum run time is imposed any time a compressor is energized.
blower is operated throughout the cycle. The 5-minute off period is necessary to defrost the indoor coil.
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177820-YIM-A-0506
The ASCD is initiated on unit start-up and on any com­pressor reset or lock-out.
FLASH CODES The UCB will initiate a flash code associated with
errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 23.
RESET Remove the call for cooling, by raising thermostat set-
ting higher than the conditioned space temperature. This resets any pressure or freezestat flash codes.
HEATING SEQUENCE OF OPERATIONS WITH OR WITHOUT ELECTRIC HEAT When the thermostat calls for the first stage of heating,
the low voltage control circuit is completed between “R” and “W1”. The 24vac signal is passed through the UCB to the “Y” contact on the Defrost Control (DC) assuring the reversing valve cannot be energized, except during defrost. If the ASCD timer is satisfied the UCB will energize compressor contactor M1.
If the compressor alone cannot satisfy the heating requirements, a second stage call from the thermostat completes the circuit between “R” and “W2”. This 24vac signal is passed through the UCB to the electric heat section (if available). The total available kW of electric heat will be energized on a call for “W2”.
DEFROST MODE As mentioned earlier, the defrost control (DC) utilizes a
time/temperature defrost scheme. The following two conditions must be met before the DC will enter a defrost mode:
The defrost thermostat (SD ) must be closed. This nor­mally open thermostat is mounted on the liquid line an d is set to close at 28 ± 4°F.
Once the defrost thermostat closes, the defrost con trol starts a run timer that must be satisfied before defrost can begin. This is accumulated compressor run time. The selection pin is factory set at 60 minutes, but is field adjustable to 30, 60 or 90 minutes.
When the DC enters the defrost mode, it’s on-board defrost relay is powered. This energizes the reversing valve, de-energizes the condenser fan motor and ener­gizes the unit’s optional electric heater. The DC remains in defrost mode until either
of the following two
conditions is met:
1. The liquid line thermostat is open. It is set to open at 55 ± 4°F.
2. The maximum defrost run time of 10 minutes is met.

FORCED DEFROST

The processor on the defrost board is only energized when the defrost sensor (DS) is closed.
To create a forced defrost:
1. The DS must eit her be closed or a jump er must be placed across the DFS terminals on the board.
2. Place a jumper across the test pin terminals on the board.
Depending on the selected defrost minimum run time of 30, 60 or 90 minutes, the board will go into defrost in 7.5, 15 or 22.5 seconds.
The DC will remain in defrost until the jumpers across the DS and the test pin terminals are removed.
Once the jumpers are removed, the board then ter­minates defrost when the DS opens or a maximum of 10 minutes after the test pin jumper is removed, whichever comes first.
SAFETY CONTROLS
The control circuit includes the following safety con­trols:
1. Temperature Limit Switch (TLS) - This control is located inside the heater compartment and is set to open at the temperature indicated in the Electric Heat Limit Control Setting Table 21. It resets auto­matically. The limit switch operates when a high temperature condition, caused by inadequate sup­ply air flow occurs, thus shu tting down the heater and energizing the blower.
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TABLE 21: ELECTRIC HEAT LIMIT CONTROL
SETTING
VOLTAGE kW TEMPERATURE LIMIT SWITCH
5 1 140
7 1,3 140
10 1,2,3 140
230-1-60
230-3-60
460-3-60
575-3-60
15 2,4,6 140
20
30 1,2,3,4,5,6 150
5 1,2,3 140
7 1,2,3 140
10 1,2,3 150
15 2,4,6 140
20 1,2,3,4,5,6 150
30
7 2,4,6 140
10 2,4,6 140
15 2,4,6 140
20 3 160
30 3 150
10 2,4,6 140
15 2,4,6 140
20 5 160
30 5 150
1,2,3,4,5 140
6 150
1,3,5 160
2,4,6 150
Open Temp
TABLE 22: ELECTRIC HEAT ANTICIPATOR
SETPOINTS
HEATER
º
F
KW
5
7 0.024 0.35 10 0.024 0.35 15 0.024 0.35 20 0.024 0.35 30 0.024 0.35
7 10 0.024 0.35 15 0.024 0.35 20 0.024 0.37 30 0.024 0.37 10 15 0.024 0.35 20 0.024 0.37 30 0.024 0.37
VOLTAGE
230-3-60
460-3-60
575-3-60
SETTING, AMPS
TH1 TH2
0.024 0.35
0.024 0.35
0.024 0.35

START-UP (COOLING)

PRESTART CHECK LIST
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.
HEAT ANTICIPATOR SETPOINTS
It is important that the anticipator setpoin t 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 co rrect setpoint will give shorter “ON” cycles and may result in the low­ering of the temperature within the conditioned space. Refer to Table 22 for the required electric heat anticipa­tor setting.
3. Turn unit electrical power on.
4. Set the room thermostat fan switch to on.
5. Check indoor blower rotation.
If blower rotation is in the wrong direction.
Refer to Phasing Section in general informa­tion section.
Check blower drive belt tension.
6. Check the unit supply air (CFM). See “CHECKING SUPPLY AIR CFM” on page 26.
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7. Measure evaporator fan motor's amp draw.
8. Set the room thermostat fan switch to off.
9. Turn unit electrical power off.
OPERATING INSTRUCTIONS
1. Turn unit electrical power on.
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.
POST START CHECK LIST
1. Verify proper system pressures for both circuits.
2. Measure the temperature drop across the evapora­tor coil.
3. Measure the system Amperage draw across all legs of 3 phase power wires.
4. Measure the condenser fan amp draw.
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 op eration after servicing.
On calls for cooling, if the compressors are opera ting but the supply air blower motor does not energize after a short delay (the room thermostat fan switch is in the “AUTO” position).
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 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.
SHUT DOWN
1. Set the thermostat to highest temperature setting.
2. Turn off the electrical power to the unit.

TROUBLESHOOTING

COOLING TROUBLESHOOTING GUIDE
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 correc t line voltage and set the voltmeter to the correct range before making any connections with line termi­nals.
When not necessary, shut off all elect ric po wer to the unit prior to any of the following mainte­nance procedures so as to prevent personal injury.
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 M2, contactor , and that the con t actor is pulled in. Check for loose wiring between the contacto r and the sup­ply air blower motor.
4. If M2 is pulled in and voltage is supplied to M2, lightly touch the supply air blower motor housing. If it is hot, the motor may be off on internal protec ­tion. Cancel any thermostat calls and set the fan switch to AUTO. Wait for the internal overload to reset. Test again when cool.
5. If M2 is not pulled in, check for 24 volts at the M2 coil. If 24 volts are present at M2 but M2 is not pulled in, replace the contactor.
6. Failing the above, if there is line voltage supplied at M2, M2 is pulled in, and the supply air blower motor still does not operate, replace the motor.
7. If 24 volts is not present at M2, 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 M2.
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8. If 24 volts is not present at the “FAN” terminal, check for 24 volts from the room thermostat. If 24 volts are not present from the room thermostat, check for the following:
a. 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.
c. Loose wiring from the room thermostat to the UCB.
9. If 24 volts is present at the room thermostat but not at the UCB, check for proper wiring between the thermostat and the UCB, i.e. that the thermostat G terminal is connected to the G terminal of the UCB, and for loose wiring.
10. If the thermostat and UCB are properly wired, replace the UCB.
On a call for cooling, the supply air blower motor is operating but the compressor 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 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 the com­pressor will be energized unless it is locked out, unless this option has been disabled through com­puter communications.
2. If no economizer is installed or the econ omizer is not opening to provide free cooling and the com­pressor 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 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 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:
a. 24 volts at the thermostat Y1 terminal b. Proper wiring between the room thermostat and the
UCB, i.e. Y1 to Y1, Y2 to Y2
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 24­volt 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 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,
the compressor may be held off for the ASC D. 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
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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-N-Lock plug, the jumper in the Mate-N ­Lock plug, and in the wiring from the Mate-N-Lock plug to the Y1 “ECON” terminal.
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 actuator may have faulted and is failing to return the 24-volt “call” to the Y1 “ECON” terminal even th ou gh 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-N­Lock plug. If the compressor ener gizes, there is a fault in the economizer wiring or actuator.
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 distributors can test the UCB for this programming.
For units with factory installed economizers, the UCB is programmed to lock out compressor opera­tion when the LAS set point is reached.
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 L ED. Pressing and releasing the ALARMS button on the UCB can check the alarm history. 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.
TABLE 23: UNIT CONTROL BOARD FLASH CODES
Flash Code Description
On Steady Heart Beat
1 Flash 2 Flashes 3 Flashes 5 Flashes 7 Flashes
9 Flashes
10 Flashes
11 Flashes 13 Flashes
14 Flashes
OFF
1.
These flash codes do not represent alarms.
Control Failure - Replace Control Normal Operation Not Applicable
Control waiting ASCD HPS1 - Compressor Lock out LPS1 - Compressor Lock out FS1 - Compressor Lock out Ignition Control Locked Out/
Ignition Control Failure / Limit Switch Trip / No Jumper Plug in Heat Section
Compressors Locked Out On Low Outdoor Air Temperature Compressors Locked Out Because the Economizer Is Using Free Cooling
Compressor Held Off Due To Low Voltage EEPROM Storage Failure (Control Failure) No Power or Control Failure
1
1
1
1

MAINTENANCE

NORMAL MAINTENANCE
For units without factory installed or with field installed economizers, the UCB allows compressor operation all the time. This programming can be checked or changed by the local distributor.
15. If none of the above correct the error, replace the UCB.
UNIT FLASH CODES
Various flash codes are utilized by the unit control board (UCB) to aid in troubleshooting. Flash codes are distinguished by the short on and off cycle used
Prior to any of the following maintenance pro­cedures, shut off all electric power to the unit to prevent personal injury.
FILTERS
Inspect once a month. Replace disposable or clean permanent type as necessary. DO NOT replace per­manent type with disposable. The dimensional size of
(approximately 200ms on and 200ms off). To show
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the replacement filter must be the same as the replaced filter.
MOTORS
Outdoor fan motors
are permanently lubricated and
require no maintenance. Indoor Blower Motor and Drive
- The indoor blower motor features ball bearings that do not require periodic lubrication.
Perform all maintenance operations on the blower motor with electric power disconnected from the unit. Do not attempt to lubricate bear­ings with the unit in operation.
On an annual basis, check the motor for accumulations of dust, etc. that may block the cooling slots in the motor shell. Check for loose, damaged or misaligned drive components. Check that all mounting bolts are tight. Replace defective parts as required.
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 su it­able means. If water is used to clean coil, be sure elec­tric power to the unit is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that
the coil fins are not damaged.
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Subject to change without notice. Printed in U.S.A. 177820-YIM-A-0506 Copyright © 2006 by Unitary Products Group. All rights reserved. Supersedes: 66278/035-16197-001-A-0204
Unitary 5005 Norman Products York OK Group Drive 73069
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