33-00462—05 18
Fig. 37. Typical wiring of a heat pump system with boiler backup
Fig. 38. Typical wiring of a heat pump system with a zone valve for backup heat
R
C
AUX1
AUX2
24 VAC TO
THERMOSTAT
THM04R3000
Y2
G
L
W1
W2
W3
Y1
RH
RC
R
C
24 VAC
POWER
O/B
HEAT PUMP / AIR-HANDLER
G (FAN)
R (24 VAC HOT)
Y1 (COMPRESSOR STAGE 1)
Y2 (COMPRESSOR STAGE 2)
C (24 VAC COMMON)
L (SYSTEM FAULT MONITOR)
O (CHANGEOVER VALVE)
REMOVE JUMPER SINCE THE BOILER HAS A SPEARATE TRANSFORMER THAN THE HEAT PUMP.
THE CHANGEOVER VALVE WILL BE LABELED O IF ENERGIZED IN COOL OR B IF ENERGIZED IN HEAT.
IF USING A HOT WATER RELAY PANEL, THE WIRES SHOWN GOING TO THE BOILDER WOULD INSTEAD WIRE TO R
AND W ON ONE OF THE ZONES OF THE PANEL.
NOTE: SEE FOLLOWING PAGES FOR ADDITIONAL THERMOSTAT WIRING GUIDELINES FOR OTHER SYSTEM TYPES,
SENSOR WIRING, IAQ CONTROL, AND OTHER DRY CONTACT WIRING OPTIONS.
1
2
3
M39207
BOILER
11
3
2
1
R
C
AUX1
AUX2
24 VAC TO
THERMOSTAT
THM04R3000
Y2
G
L
W1
W2
W3
Y1
RH
RC
R
C
24 VAC
POWER
O/B
HEAT PUMP / AIR-HANDLER
G (FAN)
R (24 VAC HOT)
Y1 (COMPRESSOR STAGE 1)
Y2 (COMPRESSOR STAGE 2)
C (24 VAC COMMON)
L (SYSTEM FAULT MONITOR)
O (CHANGEOVER VALVE)
REMOVE JUMPER SINCE THE VALVE IS POWERED BY A SPEARATE TRANSFORMER THAN THE HEAT PUMP.
THE CHANGEOVER VALVE WILL BE LABELED O IF ENERGIZED IN COOL OR B IF ENERGIZED IN HEAT.
THE WIRES THAT POWER THE VALVE ARE SHOWNON THE LEFT SIDE OF THE VALVE. THE END-SWITCH WIRES FROM
THE VALVES GO TO THE BOILER.
NOTE: SEE FOLLOWING PAGES FOR ADDITIONAL THERMOSTAT WIRING GUIDELINES FOR OTHER SYSTEM TYPES,
SENSOR WIRING, IAQ CONTROL, AND OTHER DRY CONTACT WIRING OPTIONS.
1
2
3
M39208
120
VAC
BOILER
ZONE VALVE
TRANSFORMER
11
3
24
VAC
2
1
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