York BP 090, BP120 installation manual Power Wiring Detail, Electronic Thermostat Field Wiring

66307-YIM-B-0606

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. When installing a disconnect, refer to Figure 4 for the recommended mount- ing 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, 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 sup- plied disconnect switch.

POWER WIRING DETAIL

Units are factory wired for the voltage shown on the unit nameplate. Refer to Electrical Data Tables 8 and 9 to 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.

THERMOSTAT1

TERMINALS

RC

RH

Y1

Y2

W1

W2

G

C

X1

X3 2

X4

A1

A2

T

T

TOREMOTESENSOR 2ET04701324IFUSED

UNITTERMINALS

STRIPTB1

R

Y1

Y2

W1

W2

G

C

24Volt

XTransformer

OCC

The thermostat must provide a “G” signal when there is a call for “W1.”The unit control board will energize the indoor blower when the compressors are energized; however, if the thermostat calls for “W2” during the anti- short-cycle delay, the electric heat (when installed) will be energized immediately upon the call for “W2.”

1ElectronicprogrammableThermostat2ET0770010024(includessubbase).

2TerminalsA1andA2providearelayoutputtoclosetheoutdoor economizerdamperswhenthethermostatswitchestotheset-backposition.

FIGURE 17 - ELECTRONIC THERMOSTAT FIELD WIRING

NOTE: This unit does not require a heat pump thermostat. It is designed to work with a standard two-stage cool, two-stage heat thermostat; however, the ther- mostat must provide a “G” signal when there is a call for “W1”.

16 Unitary Products Group