replacing bad honeywell chronotherm 8611 thermostat w 6320u

[paschal_old]

replacing a honeywell Chronotherm III T8611G1103  with a Honeywell th6320u which according to honeywell is one of three units they have that will work. This is a Trane XL-1400 single stage heat pump with the usual aux and emergency heat. (strips)The tstat is outside the air handler room, so was able to find what was actually being used. On the old tstat unit...the installer kept popping fuses and took hours to get it working, although it did work for five years...now it has gone crazy. Tired of killing power, pulling batteries to reset every couple days and the resets work more infrequent than before.

As it is wired now at tstat going to the air handler....From what is spliced through outside of it..

On the old 8611g

R is red wire

C is blue wire

Y is yellow wire

O is orange wire

X2 is Black wire

 

On the new th6320u the terminals available are L..... Y2......Aux/E combined....G.....O/B ......C.........Y.....R..... RC..... with R factory jumpered to RC.

 

Logically I would guess the

 

red wire to R/RC

Blue wire to C

orange to O/B

Yellow wire to Y

Black wire to Aux/E (From what I could tell in the install manual...that one bothers me)(well they all do)

 

Right or wrong?

[ACtechGUY]

You got it right . On older trane setups they called the AUX/E (electric heat) terminal - X2. It came from outside to turn on electric heat in defrost mode.

Hope you feel a little less like you will blow something up now. :>

[Bobice]

Try this http://customer.honeywell.com/techlit/pdf/PackedLit/69-1920EFS.pdf

[applianceman18007260692]

Nice pdf Bobby.

[ACtechGUY]

I justed looked at the Pdf. I don't know the thermostats by model number, but once I saw the photo......Ahhhhh....MY favorite thermostats....

I just love the honeywell focuspro line of themostats. Easy to install - 5 year warranty... not crappy...and downright inexpensive.

By the way on this thermostat you MUST NOT put in the batteries if you use the common wire from the unit. Batteries not needed.

[applianceman18007260692]

Good tip AC