How Wire a Trane, GE, or American Standard Thermostat
American Standard, GE & Trane Thermostat Wiring Connection Tables

POST a QUESTION or COMMENT about heating, air conditioning, and heat pump thermostat installation and wiring

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

Trane XL824 THERMOSTAT USERS GUIDE [PDF]
Trane XL824 THERMOSTAT INSTALLATION MANUAL [PDF]

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

...

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

...

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.

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.

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.

Or see these

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Citations & References

In addition to any citations in the article above, a full list is available on request.

[2] Thanks to reader S.R. for discussing loss of heat due to a thermostat wiring mistake, October 2010
[3] Thank to Mr. Scott Meenen , G&S Mechanical Services , for providing some common thermostat wiring codes also found at Mr. Meenen's web page Malware Deleted 12/9/2014 . Mr. Meenan provides heating, heat pump, and air conditioning repair services in Maryland, Washington D.C., and northern Virginia. He can be contacted at 301-591-1646 or by Email to Malware Deleted 12/9/2014 - 10/2010. Quoting:
We service American Standard, Amana, Arco, Arco-Air, Bryant, Carrier, Coleman Evcon, Comfortmaker, Day/Night/Payne, Dunham-Bush, Fedders, Fredrich, Goodman, General Electric, Heil, Intertherm, ICP, Janitrol, Lennox (Armstrong, Johnson Air-Ease), Miller, Modine, Nordyne, Rheem/Ruud/Weatherking, Sears, Stewart Warner, Trane, Weather King, Williams, White-Westinghouse, Whirlpool, Weil Mclain, York, (Frasier Johnson/Borg Warner) and others.

[4] Azel Technologies Inc., P.O. Box 53138 10 Royal Orchard Blvd. Thornhill, Ontario, Canada L3T 7R9 Ph: 905-223-5567 Fax: 905-223-3778 Email: info@azeltec.com, Website: www.azeltec.com.

[5] Honeywell Controls, the company wants you to use their contact form at this web page: http://www51.honeywell.com/honeywell/contact-support/contact-us.html
Honeywell Consumer Products, 39 Old Ridgebury Road Danbury, CT 06810-5110 - (203) 830-7800
World Headquarters, Honeywell International Inc., 101 Columbia Road, Morristown, NJ 07962, Phone: (973) 455-2000, Fax: (973) 455-4807 1-800-328-5111

Honeywell product model numbers & instruction Manuals: see http://yourhome.honeywell.com/home/Applications/FindYourModelNumber.aspx

[6] White Rodgers Thermostats and HVAC controls,
Homeowner information: http://www.emersonclimate.com/en-US/brands/white_rodgers/Pages/wr-homeowner-info.aspx
Contractor information: http://www.emersonclimate.com/en-US/brands/white_rodgers/wr_contractor_info/Pages/white-rodgers-contractor-info.aspx
White Rodgers Product Catalog (don't misspell the company's name as White Rogers Thermostats) -
http://www.emersonclimate.com/Documents/thermostats.pdf - Thermostat Catalog

[7] White Rodgers 1F90 Low Voltage Digital Comfort-Set thermostat Installation Instructions, PN 37-3654, White-Rodgers Division, Emerson Electric Co., 9797 Reavis Rd., St. Louis MO 63123

[8] "Automatic Oil Burner Controls - Thermostats", Domestic and Commercial Oil Burners, 3rd Ed., Charles H. Burkhardt, McGraw Hill, 1969 (and later editions), ASIN B0000EG4Y8

[9] Thermostat wiring color codes & conventions, Thanks to reader " Helpful Pointers" Regarding 24V T, 10/7/2012

[10] Domestic Central Heating Wiring Systems and Controls, 2d Ed., Raymond Ward, Newnes, ISBN-10: 0750664363, ISBN-13: 978-0750664363, Quoting from Amazon.com:
This unique A-Z guide to central heating wiring systems provides a comprehensive reference manual for hundreds of items of heating and control equipment, making it an indispensable handbook for electricians and installers across the country. The book provides comprehensive coverage of wiring and technical specifications, and now includes increased coverage of combination boilers, recently developed control features and SEDBUK (Seasonal Efficiency of Domestic Boilers in the UK) boilers ratings, where known.
In addition to providing concise details of nearly 500 different boilers fuelled by electric, gas, oil and solid fuel, and over 400 programmers and time switches, this invaluable resource also features numerous easy-to-understand wiring diagrams with notes on all definitive systems. Brief component descriptions are provided, along with updated contact and website details for most major manufacturers.

[11] Proliphix Corporate Headquarters [Website: proliphix.com] , 3 LAN Drive Suite #100, Westford, MA 01886 Phone: +1.978.692.3375 Toll Free (U.S.): 866-IP-LIVING (866.475.4846) Fax: +1.978.692.3378 - Sales: sales@proliphix.com Marketing: marketing@proliphix.com Customer support: support@proliphix.com http://www.proliphix.com/ - quoting from the company's website:
All Proliphix Network Thermostats come with our free Uniphy Remote Management Service. This unique offering lets you monitor and control your HVAC systems by simply pointing your Browser to our secure Proliphix Web Site. Enjoy the convenience of programming a thermostat from any location, using a simple graphical interface. No computer equipment or software is required. And since Proliphix takes care of the network configuration for you, you’ll be up and running in no time. We’ll even proactively monitor your thermostats and send you an immediate email or SMS message when an HVAC problem is detected.

[12] "Heating Control Handbook for the Installer and Service Man,Oil Burner, Gas Burner and Stoker Controls", Honeywell Corporation, March 1949 [copy on file as HoneywellControlsHandbookSA1399-2-1949.pdf] . Some of the controls discussed in detail here include the

Honeywell T1 and T11A = Series 10
Honeywell T21A (T2) = Series 20
Honeywell T847A = Series 80
Honeywell RA117A (RA1) = Series 10
Honeywell LA101A = Series 10,
Honeywell LA419A (LA4) = Series 40
V155A = Series 10, V435A = Series 40, V575A = Series 50, V835A = Series 80

[13] Trane TCONT800 Series Touch Screen Programmable Comfort Control Ownes Guide, American Standard, Inc., Troup Highway, Tyler TX 75711, January 2005, Telephone: Customer Service: 1-877-3381, website: www.trane.com

In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested

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How Wire a Trane, GE, or American Standard Thermostat
American Standard, GE & Trane Thermostat Wiring Connection Tables

American Standard, GE & Trane Thermostat Wiring Guide