Engineering Manual

T-STAT Interface PAC-US444CN-1
Example 4: Single-stage Cooling with Alternate Primary Heating Source
Note: For this
it is recommended to set SW2-6 to the
OFF position.
Follow the wiring from example 2, with the following adjustments:
1. Connect thermostat W1 to the alternate heat source.
2. Connect the thermostat W2 terminal to the PAC-US444CN-1 W1 terminal.
Connector Purpose Purpose
TC Common (In) C
C Common (Out) C
TR 24VAC (In) R
R 24VAC (Out) R
G3 Fan High High Fan Speed
G2 Fan Medium Medium Fan Speed
G1 Fan Low Low Fan Speed
Y2 Y2 Stage 2 Cooling
Y1 Y1 Stage 1 Cooling
W2 W2 Stage 2 Heating
W1 W1 Stage 1 Heating
G G Fan
200