7
Wiring Requirements
The following table shows the maximum wire lengths allowed:
Thermostat to HVAC Equipment
18 AWG
20 AWG
22 AWG
128 ft (380m)
80 ft (240m)
50 ft (150m)
Terminal Description and Electrical Ratings
Terminal
Description
Voltage
Current (Max)
N/C
Unused
N/A
N/A
Y
1
st
Stage Compressor
24V AC
2A
W (O/B)
1
st
Stage Heating or
Reversing Valve
Changeover
24V AC
2A
G
Fan
24V AC
2A
C
Common
24V AC
2A
Y2
2
nd
Stage Compressor
24V AC
2A
W2 (AUX)
2
nd
Stage Heating or
1
st
Stage Aux Heat
24V AC
2A
NOTE: Factory jumper installed between RC and RH. Remove jumper for
2--transformer applications. See wiring diagrams for additional information.
Summary of Contents for IIT2-WHS-02
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