Trane TZEMT400BB32MAA Manual

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If you are unsure about connecting this wire or you do not have any unused wires at the thermostat, contact

Customer Service at (877)288-7707.

Connect a 24 VAC common wire to power the thermostat.

Determine if your system has a 24 VAC common wire which is required to power the thermostat.

• If your system is a heat pump, skip to step 4.

a. IfyourexistingthermostathasaterminalnamedC,COM,X,orBwithawireconnectedtoit,skiptostep4.

b. If your thermostat does not have that terminal, or does not have a wire connected to it, go to step 3a.

a. Locate all unused (disconnected) wires from the

thermostat wire bundle and write down the colors.

• i24VCommonwireistypically(notalways)colored

blue

Unused wires

Thermostat

wire bundle

b. GotoyourHVACunitandremovethecover(s)toaccess

the24VACfurnacewireterminals.

24 VAC

Furnace

wire

terminals

Furnace

cover

c. Findthe24VACcommonterminalidentiedwiththe

letter C, X, B, or COM.

• This terminal may already have a wire connected to it

but it may not be a wire that goes to the thermostat

24 VAC common

terminal

(C, X, B, or COM)

d. Locate the thermostat wire bundle inside the furnace

panel.

• This wire bundle is routed from the thermostat,

through the walls, and into the furnace panel.

• Thisbundlecanbeidentiedatthefurnaceby

checking the wire colors connected and not connected

and comparing to the wire bundle at the thermostat.

Thermostat

wire bundle

Unused

wires

e. Find a wire from the thermostat bundle that is unused at

the thermostat and at the furnace.

• It is possible that one of the unused wires at the

thermostatwillalreadybeconnectedtothe24VAC

commonterminalatthefurnace.Ifso,gotostep4.

Unused

wire

f. Connecttheunusedwiretothe24VACterminal,then

replace the furnace cover.

• The24VACcommonwireistypically(butnotalways)

blue in color. If the blue wire has been unused, it is

recommended that you use the blue wire.

Connect

wire