10
No: IS-0685 – Rev. 2
CONVENTIONAL HEAT / COOL WIRING DIAGRAM
TWO TRANSFORMERS - (Use Jumper Wire From RC to RH)
B+ A+ B- A- C B O Y Y2 G RC RH W2 W R S2 S1 T1 T2 RSB RSA
COMMUNICATION
TERMINALS
NOT USED
NOT USED
1ST COOLING
2ND COOLING
SUPPORT
MODULE
FAN
2ND HEATING
1ST HEATING
OUTDOOR TEMP
SENSOR
REMOTE TEMP
SENSOR
THERMOSTAT IS
POWERED FROM
EXTERNAL 24VAC
TRANSFORMER
THERMOSTAT IS
POWERED FROM
THE HEAT OR COOL
SYSTEM’S
TRANSFORMER
- OR -
THERMOSTAT SECTION
HVAC SECTION
LEGEND
CAUTION!
+
+
+
External 24VAC Power to Thermostat
Never place jumper
wire from RC or RH to R
when R is powered from
an external source
Jumper from RC to R when the thermostat
is powered from HVAC Transformer
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