Install Instructions

Terminal Designations

Heat Pump System

1 HEAT 1 COOL / 2 HEAT 1 COOL

Conventional System

1 HEAT 1 COOL / 2 HEAT 1 COOL

Transformer Power Transformer Power

Transformer Common

Reversing Valve

Energized in HEAT

Reversing Valve

Energized in COOL

Fan Relay

First Stage of Emergency

HEAT

Second Stage of HEAT/

EMERGENCY HEAT

First Stage of HEAT

First Stage of COOL

First Stage of

HEAT and COOL

Second Stage of HEAT

Fan Relay

Energized in HEAT

Energized in COOL

Transformer Common

WIRING

Installation Tip:

Do not overtighten terminal block screws, as this can damage the terminal block. A damaged

terminal block can keep the thermostat from tting on the subbase correctly or cause system

operation issues. Max Torque = 6in/Ibs.