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3
Identify the existing HVAC
Indoor Unit Type
□
Gas Furnace
□
Electric Furnace
or Air Handler
CAUTION: EQUIPMENT DAMAGE HAZARD -
or high utility costs. Use the System Type list to properly select and setup the control to ensure proper heating and
cooling system operation.
4
Determine if your system has a 24 VAC common wire which is required to power the thermostat.
a.
If your existing thermostat has a terminal labeled C, X, B, or COM with a wire connected to it, skip to step 6.
b.
If your thermostat does not have a C, X, B, or COM terminal, or does not have a wire connected to it, go to step 5.
5
Connect a 24 VAC common wire to power the thermostat.
a. Locate all unused wires from the thermostat
wire bundle and write down the colors.
i24V Common wire is typically (not always) colored blue
Unused wires
System Type
from the list below.
System Type
□
Single Stage Gas Furnace
□
1 Stage Cooling
□
Multi Stage Gas Furnace
□
1 Stage Cooling
□
2 Stage Cooling
□
Single Stage PSC Blower, Electric Furnace or
Air Handler
□
1 Stage Cooling
□
1 Stage Heat Pump
□
Multi Stage, Variable Speed Blower, Electric
Furnace or Air Handler
□
1 Stage Cooling
□
1 Stage Heat Pump
□
2 Stage Cooling
□
2 Stage Heat Pump
Thermostat
wire bundle
Improper system type selection can lead to equipment damage
b. Go to the indoor air handler or furnace and
remove the cover(s) to access the 24 VAC air
handler or furnace wire terminals.
24 VAC
Air handler
or Furnace
wire
terminals
Air handler
or Furnace
cover
2
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