Copyright
©
2015 Nortek Security & Control LLC
3
Typical Wiring for Heat Pump HVAC System
THERMOSTAT CONNECTION
C 24VAC COMMON
R 24VAC RETURN
W1 HEAT STAGE 1
O CHANGEOVER VALVE
G FAN
Y1 COMPRESSOR STAGE 1
Y2 COMPRESSOR STAGE 2
TYPICAL THERMOSTAT WIRING COLORS.
CAUTION: VERIFY THAT ORIGINAL WIRING
MATCHES. COLORS MAY BE DIFFERENT
HEAT PUMP HVAC SYSTEM
BLUE
RED
WHITE
ORANGE
GREEN
YELLOW
BLACK/BROWN
THERMOSTAT BACK PANEL
Y2 Y1 G R C R W1 O
INTERNAL
R=R
JUMPER
C
WIRE IS NOT REQUIRED
FOR BATTERY OPERATION
BATTERIES ARE NOT
REQUIRED FOR 24VAC
POWERED SYSTEMS
CONNECT THE
R
WIRE TO
EITHER R TERMINAL.
R
=
R
ARE JUMPERED
TOGETHER INTERNALLY
NOTE:
IF HEATING IS OCCURING
WHEN COOOLING IS EXPECTED,
OR VICE-VERSA, CHANGE THE
CHANGEOVER TYPE TO THE
OPPOSITE SETTING.
O or B WIRE
NOTE!
MOST HEAT PUMP
SYSTEMS DO HAVE THE
C
WIRE AND THE
THERMOSTAT CAN BE
POWERED BY THE 24VAC
FROM THE HVAC SYSTEM
