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Heat Pump HVAC System Connections
Note: For typical connections to a Heat Pump HVAC system, refer to the diagram on page 3 .
The lower section shows HEAT PUMP HVAC terminal connections. The upper section shows the
STANDARD HVAC terminal connections.
Figure 9. Heat Pump HVAC System Terminal Block Labeling
Figure 10. Heat Pump HVAC System Thermostat Terminal Block Connections
Connect the wires from the HVAC system to the corresponding terminals on the thermostat back
terminal block. Use the table below as a guideline for connecting the wires.
Wire Terminal
Y1 Connect to the Y1 terminal
Y2 Connect if a 2 stage system
G Connect to the G terminal
RC Connect to either R terminal
C
Connect to the C terminal. The C wire (24VAC common) Heat Pump systems typically
have the C wire connected to the thermostat. If there is no
C
wire, batteries MUST be
installed.
W1 Connect to the W1 terminal
O/B
Connect to the O terminal. Heat Pump setup must set changeover valve to correct O or
B setting (See page 13 ).
Notes: Ensure that the appropriate wires are screwed into the terminal blocks firmly.
Gently pull on the wires to confirm the connection.
Push all excess wiring back into the wall opening.
Dual Transformer Systems
For HVAC systems that have separate heating and cooling systems with their own 24VAC transformers,
there is an “R” wire from the heating system and an “R” wire from the cooling system.
For dual transformer systems, connect the “C” wire from the
cooling system to the thermostat’s “C”
terminal. DO NOT CONNECT THE “C” WIRE FROM THE HEATING SYSTEM.
IMPORTANT: Remove the Jumper connecting RC and RH terminals (see illustration below).
Figure 7.
Dual Transformer HVAC System Thermostat Terminal Connections
Connect the wires from the HVAC system to the corresponding terminals on the thermostat back
terminal block. Use the table below as a guideline for connecting the wires.
Wire Terminal
Y2 Connect to the Y2 terminal (2-stage systems only)
Y or Y1 Connect to the Y1 terminal
G Connect to the G terminal
COOL RC Connect to RC terminal
C Connect to C terminal (Cooling System C Wire, NOT Heating System C Wire)
HEAT RH Connect to RH terminal
W or W1 Connect to W1 terminal
W2 Connect to W2 terminal (2-stage system only)
Standard
Heat Pump
HEAT PUMP SYSTEM
TERMINAL WIRING
Y2 Y1 G RC RH C W1 W2 W3 HUM- HUM+
C RH RC G Y1 Y2 HUM- HUM+ O /B AUX/E
HUM- HUM+ W3 W2 W1 C RH RC G Y1 Y2
C RH RC G Y1 Y2 HUM- HUM+ O /B AUX/E
C G
Standard
Heat Pump
Reference
Heat Pump
Terminals
(Labeled Wires)
O or B
CONNECT IF 2
STAGE SYSTEM
Y W R
HUM- HUM+ W3 W2 W1 C RH RC G Y1 Y2
C RH RC G Y1 Y2 HUM- HUM+ O /B AUX/E
C
G
Standard
Heat Pump
Reference
Standard
Terminals
(Labeled Wires)
(Remove RC - RH Jumper)
W
HEATING
SYSTEM
R
WIRE
Y2
W2
Y
OR
Y1
COOLING
SYSTEM
R
WIRE
COOLING
SYSTEM
C
WIRE
Rh
R
W1
Rc
R