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TRANSFORMER | Fan |
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120 VAC | 24 VAC |
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THERMOSTAT
WIRING
Jumper Wire
BA
**
SYSTEM
Figure 6. Typical wiring for single transformer, single stage heat pump system
Captive screws 
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THERMOSTAT
BASE
| O |
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Y | RC |
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A
U
T
OF A
ON
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HE E M A T
COVER
Figure 7. Attach thermostat to subbase
This thermostat is easy to operate. Fig. 8 shows how the heating/cooling system and fan operate when the switches are in various positions. Use the system switch to select either heating or cooling, or to turn the heating/cooling system off. Use the fan switch to control fan operation. When the fan switch is in the AUTO position, the fan will cycle with the heating or cooling system (the fan will not run if the system switch is in the OFF position and the fan switch is in the AUTO position). When the fan switch is in the ON position, the fan will run continuously, regardless of system switch position (even if the system switch is set to OFF, the fan will run if the fan switch is in the ON position).
OPERATION &
MAINTENANCE
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AUTO ON |
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Figure 8. Subbase switching and thermostat/system operation
5
