POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the current N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or local ordinances. The unit must be electrically grounded in accordance with local codes or, in their absence, with the N.E.C./C.E.C. Voltage toler- ances which must be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 3.
Electrical line must be sized properly to carry the load. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.
Refer to Figure 2 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.
The wiring entering the cabinet must be provided with me- chanical strain relief.
A fused or HACR breaker disconnect switch should be field pro- vided for the unit. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wir- ing diagram.
COMPRESSORS
Units are shipped with compressor mountings
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| CONTROL WIRING | |
THERMOSTAT | UNIT TERMINAL STRIP | ||
** = Minimum wire size of 18 AWG | R | ** | R |
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| |
wire should be used for all field |
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installed 24 volt wire. | G |
| G |
NOTE:
HEAT ANTICIPATOR SHOULD BE SET AT 0.25 AMPS FOR ALL MODELS.
PROGRAMMABLE
THERMOSTAT ONLY
*= Only required on units with supplemental electric heat.
YY
W * W
CC
24 VOLT TRANSFORMER |
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCON- NECT SWITCH, WIRING & OVERCURRENT PROTECTION.
POWER WIRING
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
OVERCURRENT PROTECTION.
FIG. 2 - TYPICAL FIELD WIRING DIAGRAM
4 | Unitary Products Group |