JUMPER
WIRE
THERMOSTAT
C B | O | Y | G | W | RC RH |
SYSTEM
Fan Heating
Relay System
Hot
24 VAC | 120 VAC |
Neutral
TRANSFORMER
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
with common connection (required)
JUMPER
WIRE
| C | B |
| O |
| Y |
| G |
| W | RC | RH | THERMOSTAT | ||||||||||||||||||||||
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| SYSTEM | ||||||||||||||||||||||||||||
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| Cooling |
| Fan |
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| System |
| Relay |
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| Hot | ||||||||
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| 24 VAC |
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| 120 VAC | ||||
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| Neutral | |
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| TRANSFORMER | ||||||||||||||
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| Figure 3. Typical wiring diagram for | |||||||||||||||||||||||||||||||
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| cool only, | ||||||||||||||||||||||||||||||||
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| with common connection (required) | |||||||||||||||||||||||||||||||
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| NOTE |
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RED jumper wire (provided with thermostat) must be |
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connected between thermostat RH and RC terminals |
| JUMPER |
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for proper thermostat operation with this system. |
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| WIRE |
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| Y |
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| THERMOSTAT | ||||||||||||||||||
C | B | O |
| G |
| W | RC | RH |
| SYSTEM | |||||||||||||||||||||||||
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| Cooling |
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| Fan |
| Heating |
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| System |
| Relay |
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| Hot |
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| 24 VAC |
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| 120 VAC |
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| Neutral | |
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| TRANSFORMER | ||||||||||||||
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
with common connection (required)
2.Press 
to adjust thermostat setting below room tempera- ture. The blower should come on immediately on high speed, followed by cold air circulation
THERMOSTAT
C B O Y | G | W | RC RH |
Cooling Fan Heating System Relay System
| SYSTEM |
| Hot |
24 VAC | 120 VAC |
| Neutral |
HEATING
TRANSFORMER
| Hot |
24 VAC | 120 VAC |
| Neutral |
COOLING TRANSFORMER
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
with common connection (required)
JUMPER JUMPER
WIREWIRE
C | B O |
| Y | G | W | RC RH | THERMOSTAT |
| SYSTEM | ||||||
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| Reversing | Compressor | Fan |
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| Valve* | Contactor | Relay |
| Hot | ||
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| 24 VAC | 120 VAC |
| * Reversing valve is energized when the |
| Neutral | ||||
| system switch is in the COOL position | TRANSFORMER | |||||
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| Figure 6. Typical wiring diagram for heat pump | ||||||
| with reversing valve energized in COOL | ||||||
| with common connection (required) | ||||||
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| JUMPER |
| JUMPER |
| |
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| WIRE |
| WIRE |
| |
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| Y |
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| THERMOSTAT | |
C | B | O | G | W | RC RH | SYSTEM | |
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| Reversing | Compressor | Fan |
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| Valve* | Contactor Relay |
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| Hot | ||
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| 24 VAC | 120 VAC |
| * Reversing valve is energized when the |
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| Neutral | |||
| system switch is in the HEAT position |
| TRANSFORMER | ||||
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Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT with common connection (required)
3.Press 
to adjust temperature setting above room tem- perature. The cooling system should stop operating.
Before you begin using your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base and press until the cover snaps onto the base.
The Thermostat Buttons and Switches
1Raises temperature setting.
2Lowers temperature setting.
3 FAN switch (ON, AUTO).
4 SYSTEM switch (COOL, OFF, HEAT).
OPERATION
1 
2
| FAN | SYSTEM |
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| ON AUTO | COOL OFF HEAT |
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| 3 | 4 |
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°F |
| °C |
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7 | 5 | 6 | 5 |
Figure 8. Thermostat display, buttons, and switches
3