York BCH 036 Thermostat, Power And Control Wiring, Control Wire Sizes, Options/Accessories

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THERMOSTAT

177820-YIM-A-0506

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 manufac- turer'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 toler- ances, which must be maintained at the compressor terminals, during starting and running conditions, are indicated on the unit Rating Plate and the Unit Applica- tion 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 cir- cuits. Wire entry at knockout openings require conduit fittings to comply with NEC (in U.S.A.), CEC (in Can- ada) 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.

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

Maximum Length1

18 AWG

150 Feet

 

 

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

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 por- tion of the unit control box.

These CSA approved heaters are located within the central compartment of the unit with the heater ele- ments 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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Unitary Products Group

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Contents CONTENTS BCHINSTALLATION MANUAL SUNLINE SINGLE PACKAGE HEAT PUMPSEQUENCE OF OPERATIONS OVERVIEW TABLE OF CONTENTSCOOLING SEQUENCE OF OPERATION LIST OF FIGURES LIST OF TABLESINSPECTION SAFETY CONSIDERATIONSGENERAL REFERENCEPRODUCT NOMENCLATURE INSTALLATIONINSTALLATION SAFETY INFORMATION LIMITATIONSRIGGING AND HANDLING TABLE 1 UNIT APPLICATION DATA BCHLOCATION CLEARANCESFIGURE 1 - RECOMMENDED DRAIN PIPING COMPRESSORS DUCTWORKCONDENSATE DRAIN FIGURE 2 - COMPRESSOR RESTRAINING BRACKETSERVICE ACCESS FILTERSFIGURE 3 - TYPICAL FIELD POWER & CONTROL WIRING TYPICAL POWER WIRINGTYPICAL CONTROL WIRING COOLING / HEATING 24 VOLT THERMOSTATOPTIONS/ACCESSORIES POWER AND CONTROL WIRINGTABLE 2 CONTROL WIRE SIZES THERMOSTATTABLE 3 ELECTRIC HEATER CFM LIMITATIONS ECONOMIZER/MOTORIZED DAMPER AND RAIN HOODMINIMUM POSITION ADJUSTMENT FIGURE 4 - ENTHALPY SETPOINT ADJUSTMENTFIGURE 5 - HONEYWELL ECONOMIZER CONTROL W7212 ENTHALPY SET POINT ADJUSTMENTFIGURE 6 - FOUR AND SIX POINT LOADING TABLE 5 BCH 4 POINT LOADS WEIGHT DISTRIBUTIONTABLE 6 BCH 6 POINT LOADS WEIGHT DISTRIBUTION TABLE 4 CENTER OF GRAVITY ALL MODELSTABLE 8 OPERATING WEIGHTS LBS TABLE 7 PHYSICAL DATACOMPRESSORS Unitary Products Group None Unitary Products Group POWER SUPPLY TABLE 11 ELECTRIC HEAT CORRECTION FACTORSTABLE 12 VOLTAGE LIMITATIONS1 NOMINAL VOLTAGEDETAIL “A” FIGURE 8 - UNIT WITH ECONOMIZER RAINHOODDETAIL “B” TABLE 13 UTILITIES ENTRY FIGURE 10 - UNIT DIMENSIONS REAR VIEWFIGURE 11 - DISCONNECT/BLOWER ACCESS LOCATION TABLE 14 MINIMUM CLEARANCESUnitary Products Group Page Unitary Products Group 177820-YIM-A-0506 TABLE 19 BELT DRIVE BLOWER MOTOR AND DRIVE DATAUnitary Products Group PHASING FIGURE 12 - BELT ADJUSTMENTTABLE 20 STATIC RESISTANCES 5.Afteradjusting,re-tightennutsASEQUENCE OF OPERATIONS OVERVIEW OPERATIONFIGURE 13 - PRESSURE DROP ACROSS COIL COOLING SEQUENCE OF OPERATIONHIGH-PRESSURELIMIT SWITCH COOLING OPERATION ERRORSECONOMIZER SINGLE OR DUAL WITH POWER EXHAUST INTERMITTENT BLOWERLOW-PRESSURELIMIT SWITCH SAFETY CONTROLSCOMPRESSOR PROTECTION FREEZESTATSAFETY CONTROLS HEAT ANTICIPATOR SETPOINTS TABLE 21 ELECTRIC HEAT LIMIT CONTROL SETTINGSTART-UPCOOLING TABLE 22 ELECTRIC HEAT ANTICIPATOR SETPOINTSOPERATING INSTRUCTIONS TROUBLESHOOTINGCOOLING TROUBLESHOOTING GUIDE POST START CHECK LISTa.24 volts at the thermostat Y1 terminal 177820-YIM-A-0506Unitary Products Group UNIT FLASH CODES MAINTENANCENORMAL MAINTENANCE TABLE 23 UNIT CONTROL BOARD FLASH CODES177820-YIM-A-0506 MOTORSOUTDOOR COIL Unitary Products GroupNorman Unitary5005 Products
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