THERMOSTAT WIRING
The thermostat should be located on an inside wall approxi- mately 56 inches above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow the manufacturer's instructions enclosed with thermostat for general installation procedure. Seven (7)
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 Electri- cal Code C221, and/or local ordinances. The unit must be electrically grounded in accordance with NEC and CEC as specified above and/or local codes.
Voltage tolerances which must be maintained at the com- pressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 1.
The internal wiring harnesses furnished with this unit are an integral part of the design certified unit. Field alteration to comply with electrical codes should not be required. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire.
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.
Avoid damage to internal components if drilling holes for disconnect mounting.
NOTE: Since not all local codes allow the mounting of a dis- connect on the unit, please confirm compliance with local code before mounting a disconnect on the unit.
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,
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.
Unitary Products Group | 17 |