18/8 thermostat wire will be
required for correct low voltage
wiring. A common color scheme is
shown in the diagram, but please
note colors may vary.
Backup Heat Type:
Set To Gas/Oil Furnace
Outdoor Temperature Sensing:
Varies Based On Thermostat (Wi-Fi, Wired, Or Wireless Sensor)
Lockout/Switchover Temperature:
Varies Based On Desire For Greater Efficiency Or Comfort. Maximum
Comfort = 35 °F, Maximum Efficiency = -10 °F, Our Recommendation = 0 °F
IMPORTANT – the heat pump and the furnace should NEVER run at the same time. Most heat pump
thermostats are already configured to prevent this from happening.
Thermostat wiring to the terminals
on the furnace will vary based on
the brand of the thermostat. Please
refer to the thermostat manual for
furnace wiring. Look for a section
on dual fuel wiring. Some
thermostats send the call for
backup heat over the W terminals
as shown. Some send the backup
call over Aux/E.
Typical Wiring Example
Reversing Valve (O/B):
Set To Energized In Heating Mode (Opposite Of Most Default Settings)
2023 V1.0
Thermostat Wiring
IMPORTANT
– Every thermostat is different. Modern thermostats will have an “Installer Setup” or
“Advanced Options” mode. A dual fuel setup
requires
a heat pump compatible thermostat, which
will call on the furnace only as backup heat at extreme low temperatures. Here are general
guidelines – refer to your thermostat manual for specifics.
Installer Setup & Advanced Options Settings
System Type:
Set To Dual Fuel
