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Thermostat wiring reference chart - simplest case two-wire thermostat (C) Daniel Friedman How Wire a Trane, GE, or American Standard Thermostat
American Standard, GE & Trane Thermostat Wiring Connection Tables

Thermostat wiring details & connections for GE, Trane, or American Standard thermostats. This article gives a table showing the proper wire connections for the American Standard, GE or Trane room thermostat used to control heating or air conditioning equipment.

Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired heating system.

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American Standard, GE & Trane Thermostat Wiring Guide

How to Wire a General Electric (GE), Trane, American Standard HVAC Thermostat

Numbers   Refer to the equipment wiring diagram (usually glued inside the equipment access covers and in the the installation/service manual). May be stages of electric heat, especially on
Air-Pro, Borg Warner, Coleman-Evcon, Frasier Johnson
(L)
Blue, Brown, Tan, or Gray Service indicator lamp
(W2)
Pink or other color Second stage of heat (may be same as (W) on heat pump or oil/gas systems.
(X2)
  Second stage of electric heat on GE/Trane/American Standard systems. Also used as indicator lamp or misc. contact on other systems.
(Y2)
Blue, Pink Compressor second stage

Notes to the table above

Also see

Also see TRANE AIR CONDITIONERS & HEAT PUMPS - manuals, contact information

Trane 3AAT80B1A1 Thermostat Wiring Connections

Below: typical wiring of a Trane Weathertron Baystat 240 / Trane 3AAT80B1A1 Thermostat

Trane-3AAT80B1A1-Thermostat wiring example (C) InspectApedia.com

...

Wiring Trane Weathertron Baystat 240 / Trane 3AAT80B1A1 Thermostat

Terminal Wire ID
R Red (Common 24VAC)
T Brown (Often connect to C or Common or W2 2nd backup heat)
O Orange
G Green (Switched Fan relay, main blower)
X2 Black (24VAC)
B Blue (Often C-wire or Common) may bring power to the thermostat
W White (Jumper to U)
F Gray

Notes to the table above:

See

COMMON WIRE at THERMOSTATS

 




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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2023-07-20 by InspectApedia Publisher - wiring details for converting Honeywell HZ432 TrueZONE control panel utilizing Trane TCONT802AS32DAA Thermostats to Honeywell T9 thermostats

@Bob,

Excellent, Bob, we'll be sure to keep your notes and illustration with this article on Honeywell thermostats and to x-link it from our Trane page as these details will help other readers.

Thank you for taking the time to follow-up with the wiring details for converting Honeywell HZ432 TrueZONE control panel utilizing Trane TCONT802AS32DAA Thermostats to Honeywell T9 thermostats.

Working together makes us smarter.

[Note: this reader exchange is also posted at WIRING A HONEYWELL ROOM THERMOSTAT]

On 2023-07-19 by Bob - wiring dilemma solved

@Bob, SOLVED - The image below is my final / working wiring diagram.

final wiring diagram for a Trane to Honeywell thermostat conversion

On 2023-07-17 by Bob

@InspectApedia Publisher,
I called the Zone Board "Professional Help" line. when asked if I was a Pro I told him "I'm retired, so I guess I'm a homeowner". He offered help and said my wiring was correct except the black should be connected to AUX.

I asked if he meant W2/AUX and he said yes. I hooked it up and started the setup and was given an error message - "Invalid Wiring! You connected backup heat to the W1 terminal on the thermostat. Please use the W2/AUX terminal for the aux/backup heat instead."

Tried swapping the white and black but got the same message. Frustration is building .

On 2023-07-17 by InspectApedia Publisher

@Bob,

I agree that it's very frustrating - a combination of several concerns can prevent a manufacturer from helping out a homeowner.

If you're up for reading wiring diagrams that can help, and if you don't have the IO manual for your Trane heat pump, we provide free PDF downloads for Trane as well as more contact information at

TRANE AIR CONDITIONERS & HEAT PUMPS

Give it a shot and keep me posted - your confirmation of wiring connections will sure help other readers.

On 2023-07-17 by Bob - frustrated with lack of customer support

@InspectApedia Publisher,
Yup. The 'Home' that handles the Thermostats say I need a Pro to tell me about the wiring conversion. The ZonePanel support is for Pros only. As a retiree on a fixed income (fixed before the Biden-flation) I need to try the DIY approach whenever possible. It's frustrating that the 'Home' support isn't allowed to talk about the Zone board output.

If I can't find any 'sure' affirmations on the wiring I may just risk installing one and hope for the best (no sparks or tripped circuts). Thanks for the input!
- Bob

On 2023-07-17 by InspectApedia Publisher

@BobT,

You're wiring guesses look reasonable to me but I want to emphasize that I'm at the limit of what I can say with confidence here.

Have you tried calling Trane customer support?

On 2023-07-15 by BobT - how do I convert wiring from Trane thermostat to Honeywell thermostat?

I have a Trane XL16i 4TWX6048 4- ton High Efficient two stage scroll heat pump with a Trane Variable Speed Air Handler: 4TEE3F49B1000AA with BAYHTR1419BRK resistance backup heat connected to a Honeywell HZ432 TrueZONE control panel utilizing Trane TCONT802AS32DAA Thermostats.

We want to replace these thermostats with Honeywell T9 (RCHT9510WFW) Thermostats. Honeywell support couldn't help with the wiring conversion.

Anyone have good advice? The image shows where I'm at so far. The Green indicates some confidence. Orange not so much.

initial wiring diagram for a Trane to Honeywell thermostat conversion

Question: Replacing a round Honeywell T87 with a Digital Honeywell Thermostat

Hello - I am replacing a round Honeywell thermostat with a non-programmable digital Honeywell unit. I have a hot water system with multiple zones and with no air conditioning.

There are three wires at the thermostat. On the old round unit the red wire went to the R terminal, the white wire went to the w terminal and a green wire went to B terminal.

I hooked up the new stat the same way but it would not work. If I selected "fan on" instead of "fan auto" the zone would heat up but would not shut off (hot water kept flowing even if I selected a temp below room temp). Appreciate your help. - Patrick - 1/20/12

Reply:

Patrick, typically the three wire thermostat hookups would be exactly the same for the old and new thermostats.

For details of wiring a typical and simple digital Honeywell thermostat,

see Honeywell 5-2 Day Programmable Thermostat - RTH2300B1012.

For help in understanding the wiring of your old thermostat,

see Three-Wire Honeywell Wall T87-F type Thermostat wiring and also

see Generic HVAC Thermostat Control Wiring Points

Question: Replacing a mercury thermostat with a digital unit

I am replacing an old mercury thermostat with a digital. my system is a heat pump. my neighbor gave me the digital, no instructions, no box. i'm trying to decide if this is even a heat pump compatible thermostat. on the therm it has c, g, rc, rh (which are linked by a black wire.) w, y, b, and o.

Coming out of my wall is, white connected on old therm w2, yellow connected to y, green conn g, black conn e, red to r, blue to b and bro to x. any help would be great. - Kurt 6/4/12

Reply:

Kurt, as you see in the examples at For help in understanding the wiring of your old thermostat,

see THREE-WIRE HONEYWELL WALL T87-F TYPE THERMOSTAT WIRING and also

see GENERIC HVAC THERMOSTAT CONTROL WIRING POINTS.

Many thermostat wiring setups are straightforward or "cookbook" but why not find the brand name on your thermostat and then you can obtain the installation instructions right from the manufacturer?

Also, Honeywell's thermostat replacement advice (and most likely that of all thermostat manufacturers) warns:

Watch out: MERCURY NOTICE: Do not put your old thermostat in the trash if it contains mercury in a sealed tube.

Contact your local waste management authority for instructions regarding recycling and proper disposal.[5]


Continue reading at THERMOSTAT INSTALLATION STEPS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

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THERMOSTAT WIRING TRANE HVAC at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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INDEX to RELATED ARTICLES: ARTICLE INDEX to HVAC THERMOSTATS

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