11
Installation Instructions
The Thermostat Backplate
R
24 VAC return
G
Fan relay
W1/O/B
1st stage heat circuit
W2
2nd stage heat circuit
Y1
1st stage compressor relay
Y2
2nd stage compressor relay
W3
3rd stage heat circuit
HUM
Humidifier control circuit
DEHUM
Dehumidifier control circuit
C
24 VAC common
AUX
Aux output
OUTDOOR Outdoor sensor
SENSOR connections
REMOTE
Remote sensor
SENSOR connections
DRY
Dry Contact
CONTACT connections
IMPORTANT: This thermostat requires connection of both R (24 VAC
Return) and C (24 VAC Common) to the backplate terminals.
To remove the thermostat
backplate: Gently separate
the display from the base by
pulling first from one side,
then the other until the two
pieces unsnap.
When stat is NOT mounted on wall...
R
G
W1/O/B
W2
Y1
Y2
W3
DEHUM
HUM
C
AUX
REMOTE SENSOR
OUTDOOR SENSOR
DR
Y
CONTAC
T
