Copyright © 2016 Broan-NuTone LLC 3
Typical Wiring for Heat Pump HVAC System
THERMOSTAT CONNECTION
C 24VAC COMMON
R 24VAC RETURN
W1 HEAT STAGE 1
O CHANGEOVER VA LV E
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 PA NEL
Y2
Y1 G RC
RW1
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
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