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Heat pumps systems
1H/1C Heat Pump System
R Power
Rc [R+Rc joined by Slider Tab]
Y Compressor contactor
C* 24VAC common
O/B Changeover valve
G Fan relay
2H/1C Heat Pump System
R Power
Rc [R+Rc joined by Slider Tab]
Y Compressor contactor
C* 24VAC common
O/B Changeover valve
G Fan relay
Aux Auxiliary heat**
E Emergency heat relay**
L Heat pump fault input
2H/2C Heat Pump System
R Power
Rc [R+Rc joined by Slider Tab]
Y Compressor contactor (stage 1)
C* 24VAC common
O/B Changeover valve
G Fan relay
Y2 Compressor contactor (stage 2)
L Heat pump fault input
3H/2C Heat Pump System
R Power
Rc [R+Rc joined by Slider Tab]
Y Compressor contactor (stage 1)
C* 24VAC common
O/B Changeover valve
G Fan relay
Aux Auxiliary heat**
E Emergency heat relay**
Y2 Compressor contactor (stage 2)
L Heat pump fault input
* This thermostat requires a C-Wire. If a C-Wire is not available and the system uses Y and G, use C-Wire
adapter accessory THP9045A.
** If you do not have separate wires for the Aux and E terminals, connect the wire to the Aux terminal.
NOTE: Do NOT use W for heat pump applications. Auxiliary heat must wire to AUX or E.
NOTE: If the valve uses Y for power close, the thermostat needs to be configured for a radiant heat system
without cooling.
Conventional systems
Note: When T10+ is used with THM04R3000 EIM, wire only R and C to T10+ to
power the thermostat. Then follow the wiring diagrams included in EIM literature.
Power open Zone valve
R Power from transformer
Rc [R+Rc joined by Slider Tab]
W Valve
C* 24VAC common
Series 20 Zone valve
(power open and power closed)
R Power from transformer
Rc [R+Rc joined by Slider Tab]
W Power open valve (usually B)
Y Power close valve (usually W)
C* 24VAC common
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