80 Series Thermostats
41
Universal Models - 2H/2C Wiring
• Universal Applications (1F85U-22)
– Fossil Fuel, 2 Heat/2 Cool is a standard multi-stage gas and A/C
system
– Heat Pump, 2 Heat/2 Cool
• The Universal -22 for Heat Pump in the heat mode is 1st stage
compressor, second stage Aux.
– For two stage heat pumps, use the -42 (4H/2C) model
• Integrated RC/RH jumper on the back of the thermostat
• Selectable O/B switch setting on the back of the thermostat
• Dual Fuel is selected in the Installer’s Menu, Item 60
Universal 2 Heat / 2 Cool
Furnace 2
Stage
A/C 2 Stage
RC RH O/B G Y Y2 W/E W2 C L
Power
for
Cooling
Power
for
Heating
Reversing
Valve
Fan
Rela
y
1
st
Stage
Comp.
2nd Stage
Comp.
1
st
Stage
Heat Gas
2
nd
Stage
Heat Gas
Comm
on wire
for 24C
Heat Pump
Malfunction
Diagnostics
Terminal
(input
signal
requires
common)
Heat Pump
w/ 1 stage
Aux or
(Dual Fuel)
1
st
Stage
Comp.
No Call
2
nd
Stage
Aux Heat
and
Emer Only
2nd Stage
Heat
Aux Stage
RC RH O/B G Y Y2 W/E W2 C L
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