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I'm replacing a Trane Weathermen Baystat 239 with a Honeywell RTH6350D. Honeywell manual says the black AND the white attach to the AUX together! Diagrams I am seeing does not support that theory. ??

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  • Master
  • 1,089 Answers

Yes that is correct. White and black go to your aux terminal. Then be sure you are setup for heat pump with back up electric heat.

Posted on May 08, 2017

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Posted on Jan 02, 2017

  • 415 Answers

SOURCE: Upgrade Baystat 239 to a Honeywell RTH7600D controller

For Trane sytems, B is your "Common" wire. O is your reversing valve relay, G is your fan, Y is your compressor contactor, R is Hot, Brown will not be used on your electronic tstat. X2 is your backup electric heaters. Without knowing what terminals are on your new tstat, I cannot offer more information than this. The installation manual may indicate what each terminal is controlling. I strongly suggest to write down ALL of the terminals and colors from your old t-stat and be sure to turn off the power to your air handler. Put the fan switch on your tstat to ON before turning off the power. Make sure the fan is running. Then turn the power off to your Air Handler. If your fan stops running, you have turned the power off to your tstat and are ready to start replacing it with your new tstat. I hope you find this helpful. Good Luck!!!

Posted on Feb 07, 2010

Master_Tech
  • 770 Answers

SOURCE: need wiring help for replacing

I am not sure of what help you need on it but here are the most common wiring on a stat
W= heat
C=Common (24V)
R=Hot (24V)
G= Fan
RC=Hot (24v for Cooling)
RH= Hot (24v for Heat)
O= Reversing Valve (Heat Pumps Only)
Hope this helps

Posted on May 11, 2008

kingbrizzle
  • 407 Answers

SOURCE: Honeywell RTH6300B to replace Trane Baystat 239

Sad to say but you have bought an non compatible thermostat, what you need is a thermostat that has "Heat Pump" somewhere on the package, Honeywell makes those also in the same models, sometimes they can be tricky if your not looking. It should also say 2heat, 1cool too. Hope this helps and good luck!

Posted on Jul 14, 2010

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1 Answer

How can I make a thermostat connection?


Good morning Yakup.

The best way is to write down how the old t-stat was wired. If that's not available, the only way to determine for certain where each wire goes, is to check what the installer did at the terminals in your home comfort system. Please note the there is high voltage electric in each piece of equipment so if you decide to open up panels, there is always the risk of damaging the equipment or worse, injury or death if you are not a qualified service technician. However, typical color assignments are as follows:
R= (24v from heating appliance) Red
RC= (24v from cooling appliance) Red
These two are only separated when you have two different appliances providing seasonal comfort, like a boiler and an air handler. If you have a warm air furnace with an air conditioner or a heat pump attached then R+RC will have a jumper across them and only one RED wire will be landed there
W= (heat) White
Y= (cool) Yellow
G= (fan) Green
Those colors are pretty standard
The rest of the colors depend on availability in the jacket and are really up to the installer. You mentioned 7 wires but 8 conductors is more likely so I'm assuming the remaining colors are black, brown, blue, and orange.
I always use the following:
C= (common) Black
O/B= (reversing valve for a heat pump) Orange if the valve is energized for heat and Blue if the valve is energized for a/c.
Aux/E= (auxiliary or electric heat) Brown
L= I believe this is a diagnostic terminal for some systems with feedback data and is not used frequently.
After wiring there is some programing to do to set up your new thermostat to your type of system.

Hope that helps. God bless and be careful.

Aug 06, 2014 | Honeywell RTH6350D1000 5/2Day Prog...

1 Answer

How do I change Honeywell RTH6350D thermostat from Celcius to farenheit?


yourhome.honeywell.com/home/Products/.../RTH6350D.ht

Operating manual.

May 27, 2014 | Honeywell RTH6350D1000 5/2Day Prog...

1 Answer

Heat/Cool does not respond after replacing Trane Weathertron BAYSTAT239 with Honeywell RTHL3550


Sounds like you didn't turn the power off and blew the low voltage fuse. Typically a 5 amp blade style (like a car) inside furnace. TURN THE POWER OFF!!

Jul 13, 2017 | Heating & Cooling

1 Answer

Changing From Trane to Honeywell


Color ---> New stat terminal

Blue--------C
Green------G
Yellow-----Y
Orange----O
Red---------R
White------E and Aux.
Tan---------unused, tape and secure it

If there is Rh and Rc or R and Rh, these terminals should be jumpered together.

I used to install Weathertrons eons ago. Whatever you do DO NOT connect the blue wire to the B terminal, you will short out your low voltage transformer immediately when you switch to heat

Jun 13, 2013 | Honeywell RTH3100C - Digital Heat Pump...

1 Answer

Honeywell RTH6300B to replace Trane Baystat 239


Sad to say but you have bought an non compatible thermostat, what you need is a thermostat that has "Heat Pump" somewhere on the package, Honeywell makes those also in the same models, sometimes they can be tricky if your not looking. It should also say 2heat, 1cool too. Hope this helps and good luck!

May 23, 2010 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Upgrade Baystat 239 to a Honeywell RTH7600D controller


For Trane sytems, B is your "Common" wire. O is your reversing valve relay, G is your fan, Y is your compressor contactor, R is Hot, Brown will not be used on your electronic tstat. X2 is your backup electric heaters. Without knowing what terminals are on your new tstat, I cannot offer more information than this. The installation manual may indicate what each terminal is controlling. I strongly suggest to write down ALL of the terminals and colors from your old t-stat and be sure to turn off the power to your air handler. Put the fan switch on your tstat to ON before turning off the power. Make sure the fan is running. Then turn the power off to your Air Handler. If your fan stops running, you have turned the power off to your tstat and are ready to start replacing it with your new tstat. I hope you find this helpful. Good Luck!!!

Feb 06, 2010 | Heating & Cooling

1 Answer

Need wiring help for replacing trane model baystat 239 with a honeywell th8321u thermostat


I am not sure of what help you need on it but here are the most common wiring on a stat
W= heat
C=Common (24V)
R=Hot (24V)
G= Fan
RC=Hot (24v for Cooling)
RH= Hot (24v for Heat)
O= Reversing Valve (Heat Pumps Only)
Hope this helps

May 11, 2008 | Heating & Cooling

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