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7
Remove existing wall plate.
Note: During this process, make sure that the wires do
not pull back into wall opening.
Detach all wires from wall plate.a.
Remove all screws attaching the wall plate to the b.
wall and remove wall plate.
See “MERCURY NOTICE” to the right.c.
3
MERCURY NOTICE
When this control is replacing an old control that
contains mercury in a sealed tube, do not dispose
of your old control in the trash. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and proper
disposal of the old control.
A listing of heating, ventilating and air conditioning
wholesalers that participate in the Thermostat
Recycling Corporation’s recycling program are
available at www.thermostat-recyle.org .
6
Identify your System Type from the list below.
You will need to check your wire labels to help identify the system type.
1
Gas Furnace - Single Stage
- Uses gas for heating
- Has a “W” or “W1” wire, but does NOT have a “W2”
1
Gas Furnace - Multistage
- Uses gas for heating
- Has a “W” or “W1” wire plus a “W2” (for 2nd stage heat) and/or "Y2" (for 2nd stage cool)
1
Electric Furnace - Single Stage
- Uses electric for heating
- Does NOT have an “O” or “B” terminal (those are unique to a Heat Pump system)
- Has a “W” or “W1” wire, but does NOT have a “W2”
1
Electric Furnace - Multistage
- Uses electric for heating
- Does NOT have an “O” or “B” terminal (those are unique to a Heat Pump system)
- Has a “W” or “W1” wire plus a “W2” (for 2nd stage heat) and/or “Y2” (for 2nd stage cool)
1
Heat Pump - Single Stage
- Has an “O” or “B” terminal (for the change over valve) which is unique to heat pumps
- Does NOT have a “Y2” terminal (for 2nd stage heat and cool)
1
Heat Pump - Multistage
- Has an “O” or “B” terminal (for the change over valve) which is unique to heat pumps
- Has a “Y2” terminal (for 2nd stage heat and cool)
CAUTION: EQUIPMENT DAMAGE HAZARD - Improper system type selection can lead to equipment damage
or high utility costs. Follow the System Type table carefully to properly select and setup the control to ensure proper
heating and cooling system operation.