1F78-144 |
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CONFIGURATION AND |
1F78-151 |
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TYPICAL WIRING DIAGRAMS |
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CONFIGURATION
TECHNICAL HELP
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W |
RH |
B |
RC |
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G |
O |
Y |
W905 |
W904 |
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W905 |
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Clip for |
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Hydronic |
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System |
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ELEC |
GAS |
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W904 |
Electric/Gas |
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Clip for |
Switch |
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Celsius Display |
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TYPICAL WIRING DIAGRAMS
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JUMPER |
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WIRE |
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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 |
120 VAC |
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Neutral |
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Cool only, 3-wire, single transformer systems
JUMPER
WIRE
THERMOSTAT
B |
O |
Y |
G |
W |
RC RH |
SYSTEM
NOTE |
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Fan |
Heating |
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For 2-wire Heat |
only |
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Relay |
System |
Hot |
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attach to RH and W |
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24 VAC |
120 VAC |
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Neutral |
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TRANSFORMER |
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Heat only, 3-wire, single transformer systems
B |
O |
Y |
G |
W |
RC |
RH |
THERMOSTAT |
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SYSTEM |
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Cooling |
Fan |
Heating |
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Hot |
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24 VAC |
120 VAC |
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System |
Relay |
System |
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Neutral |
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HEATING TRANSFORMER |
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Hot |
24 VAC |
120 VAC |
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Neutral |
COOLING TRANSFORMER |
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Heat/cool, 5-wire, two-transformer systems
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JUMPER |
JUMPER |
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WIRE |
WIRE |
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Y |
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THERMOSTAT |
B O |
G |
W RC RH |
SYSTEM
Reversing |
Compressor |
Fan |
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Hot |
Valve* |
Contactor |
Relay |
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24 VAC |
120 VAC |
* Reversing valve is energized when the |
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Neutral |
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system switch is in the COOL position |
TRANSFORMER |
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B O
NOTE
RED jumper wire (provided with thermostat) must be connected between thermostat's RH and RC terminals for proper thermostat operation with this system.
JUMPER
WIRE
THERMOSTAT
Y |
G |
W RC RH |
SYSTEM
Cooling |
Fan |
Heating |
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System |
Relay |
System |
Hot |
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24 VAC |
120 VAC |
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Neutral |
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TRANSFORMER |
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Heat pump with cool active reversing valve
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JUMPER |
JUMPER |
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WIRE |
WIRE |
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Y |
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THERMOSTAT |
B |
O |
G |
W RC RH |
SYSTEM
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 |
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system switch is in the HEAT position |
TRANSFORMER |
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Heat/cool, 4-wire, single transformer systems |
Heat pump with heat active reversing valve |
190 |
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