Install Instructions

• The Heat On symbol is shown on the display when the thermostat is heating.

• Heating for freeze protection is provided whenever the air or floor temperature falls below 40

F (4.5

C),

regardless of operating mode.

•

The Cool On symbol is shown on the display when the thermostat is cooling.

The thermostat supports two heating system types: 1) conventional, or 2) heat pump.

Conventional Systems

A conventional heating system includes: furnaces, air conditioners, hydronic heating systems with

baseboards, radiant floors, or fan coils and electric heating.

The thermostat supports up to two heating stages, two cooling stages, a fan and two accessory relays.

EQUIPMENT SETTING 1H/1C 1H/2C 2H/1C 2H/2C

First stage heating W1 W1 W1

Second stage heating - - W2

First stage cooling Y1 Y1 Y1

Second stage cooling - Y2 -

Fan G

Accessory 1 Choice of: Humidifier, Dehumidifier, HRV/ERV

Accessory 2 Choice of: Humidifier, Dehumidifier

Heat Pump Systems

A heat pump system may include additional heat sources as backup. The thermostat supports up to

four heating stages, two cooling stages, a reversing valve, a fan and one accessory relay.

EQUIPMENT SETTING 1HP 1HP/1AUX 1HP/2AUX 2HP 2HP/1AUX 2HP/2AUX

First stage heating Y1 Y1 Y1 Y1 Y1 Y1

Second stage heating - W1 W1 Y2 Y2 Y2

Third stage heating - - W2 - W1 W1

Fourth stage heating - - - - - W2

First stage cooling Y1 Y1 Y1 Y1 Y1 Y1

Second stage cooling - - - Y2 Y2 Y2

Fan G

Accessory 1 Choice of: Humidifier, Dehumidifier, HRV/ERV ventilator

Accessory 2 Reversing valve O relay remains closed during cooling.

Reversing valve B relay remains closed during heating.

Heating and Cooling Operation

Sequence of Operation