York F3EH090 installation manual Power And Control Wiring, Field Wiring

POWER AND CONTROL WIRING

Install electrical wiring in accordance with the latest National Electrical Code (NFPA Standard No. 70) and/or local regula- tions. The unit should be grounded in accordance with these codes.

Route the power wires into the unit through the 1-3/8” knockout in the rear panel, and connect them to the terminals on blower motor contactor 10M. Route the control wires into the unit through the 7/8" hole in the rear panel, and connect them to the terminals on block 4TB. Refer to the unit drawing in Fig. 12 for the locations of these knockouts.

If the unit includes an electric heat accessory, route the power wires into heater control box in lieu of the unit. Refer to electric

035-09651-001-A-0304

heat instruction Form 035-16602-002 for additional installation information.

NOTE: Motors are wired for a 460V power supply. Refer to the wiring diagram inside the motor terminal box when re- connecting motor leads for a 208 or 230 volt power supply.

Refer to Table 6 to size the disconnect switch, the power wiring, the fuses and the control wiring. Refer to Fig. 11 for field wiring diagram.

If the supply air blower rotates in the wrong direction, reverse two of the motor leads at blower motor contactor 10M.

NOTE: For thermostat to be used on these units refer to form #036-13335-003.

NOTE: Refer to electric heat instruction 035-16602-002 for additional power and control wire requirements if the indoor unit is equipped with an electric heat accessory.

FIG. 11 - FIELD WIRING

10 Unitary Products Group