Emerson 80 Series - 80 Series Universal -42 (4 H;2 C) Wiring

80 Series Thermostats
42
80 Series Universal -42 (4H/2C) Wiring
• Universal Applications
– Heat Pump, 4 Heat/2 Cool
• The Universal -42 for Heat Pump has 2 stages of compressor (Y1 & Y2) plus 2 stages of
Auxiliary (W/E and W2)
• 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 4 Heat / 2 Cool
2 Stage
Furnace
w/ 2 Stage
A/C
RC RH O/B G Y Y2 W/E W2 C L
Power
for
Cooling
Power
for
Heating
Reversing
Valve
Fan
Relay
1
st
stage
compressor
2
nd
stage
compressor
1
st
Stage Heat
Gas
2
nd
Stage
Heat Gas
Common
wire for
24C
Heat Pump
Malfunction
Diagnostics
Terminal
(input signal
requires
common)
2 Stage
Heat Pump
with w/ 2
Stage Aux
or
(Dual Fuel)
Staged Aux
Heat and
Emer Only
Staged
Heat (Aux)
RC RH O/B G Y Y2 W/E W2 C L
NOTE: When using a separate stage of auxiliary as
the emergency mode the thermostat will only have 3
stages of heat for normal operation.