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

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

These connections also work for most GE (General Electric and Trane) thermostats.

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

We provide thermostat wiring connections for just about every type of residential heating or cooling room thermostat as well as a description of thermostat wiring color codes & conventions.

On 2019-03-04 by (mod) -

How to Debug a Thermostat by First Eliminating the Thermostat and its Wires from Heater (or A/C) Operation

NO Ken I was saying that you can simplify the diagnosis of a thermostat wiring problem by eliminating the thermostat and all of its wiring from the equation.

  1. Go to the heating equipment primary control
  2. Find the place on that control where the thermostat wires connect - normally marked T1 and T2 or just T and T.
  3. Disconnect the thermostat wires from the control
  4. Now, remembering that the thermostat is nothing but a low-voltate-operated On-Off switch that turns the control on or off on a call for heat (or cooling), just jumper the two T - T terminals on the control.
  5. Watch what happens. Does the heater or A/C run properly?

That's exactly the same effect you'd see IF the Thermostat on the wall in the occupied space were calling for heat.

Now

IF the heater runs normally (or on a hot water heating system the zone valve operates)

THEN we know that the problem is at the thermostat or in the wires between the thermostat and the control

On 2019-03-04 by ken

Are you saying to disconnect the heating element and then jumper 2 of the termiinals together and reconnect the heating element to see if that works and do this until you get the correc2 terminals?

On 2019-03-04 by (mod) -

Disconnect wires AT THE HEATER

and then see if connecting the two T T terminals there cause the heater to run. Then you'll understand where you are.

Watch out: when we're not familiar with electrical wiring it's safest to get on-site help - making a mistake could become a disaster and with heating systems risks fire, shock, or worse.

On 2019-03-04 by ken

You are saying just jumper 2 terminals at a time together and see if any of them turn on the heat. If so then those are the 2 that need connected to the thermostat.

On 2019-03-04 by Anonymous

I'm stuck YouTube partly because I'm not sure exactly what your equipment and wiring are doing. I think what you might do is work backwards from your heating system.

You should have to thermostat wires connected to the thermostat connections at your heater that will call for heat if you simply connect or jumper those two terminals the heat turn on if it doesn't then you've got the wrong terminals at the heater or something is broken.

If he does turn on by jumping the thermostat terminals at the heater and you know that you just need those two wires brought to a thermostat that it's needed to act as a simple on-off switch.

On 2019-03-04 by ken

I need to know If the 2 wire thermostat will work doingg this and which of the 8 terminals I need to use. We bought a 2 wire thermostat and used the terminals on the unit labeled red and white which is what is marked on the thermostat. but it would not come on.

On 2019-03-03 - by (mod) -

You'll be heating in the more-expensive electric backup heat mode but it's possible.

On 2019-03-03 by ken

Can I use the inside unit from an American standard system as a furnace to heat my garage? If so how many wire thermostat do I use and how do I connect in the unit.

This is the air handler I suppose from an electric system Model #TWV025B14oA1. In other words I guess what I am saying is I do not have the outside unit. just the air handler with the auxillary heat in it.

On 2019-03-03 by (mod) -

Sorry I don't understand the question - what "inside unit" and what "american standard system" to be used as a "furnace" ?

A furnace is a forced warm air heating system

Typically a simple 2-wire thermostat is used to control a heat-only system.

On 2019-03-02 by ken

Can I use the inside unit from an American standard system as a furnace to heat my garage? If so how many wire thermostat do I use and how do I connect in the unit.

On 2016-02-21 - by (mod) -

Tom: Check the wiring diagrams in your installation instructions sheet for the American Standard ACONT802 thermostat. You'll see that there are different terminal identifications for different applications such as Heat/Cool, Heat Pump. For EXAMPLE (this may not be your system), X2 is actively used in a single stage heat pump with an aux backup heat source and connects on the board to W2, or with a multi-stage, to W3 - relays for backup heat.

On 2016-02-21 by Tom

The FocusPro 6000 also has an "E" terminal.

On 2016-02-21 by Tom

I have swapped the residences of a Honeywell FocusPro 6000 series thermostat (TH6220D) and an American Standard ACONT802AS32DA thermostat. When swapping the FocusPro 6000 to where the ACONT802 was I found the ACONT802 had an extra wire connected to the X2 pin... does this connect to the remaining pin on the FocusPro at the "L" terminal? What is this wire for? Can it be left unused?

Thanks- Tom

On 2015-08-31 - by (mod) -

If there is no power to the thermostat check for 24VAC at the transformer that powers it - usually located in or near your inside air handler; if there is power there then the TT wires are perhaps disconnected or broken.

On 2015-08-30 19:20:44.538107 by Robert

Lost 24vac to thermostat. System is American Standard heat pump, Heritage 11, manufactured Sept, 2000. Is there a fuse or a reset button that's not shown on the schematic

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.

Ii'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]


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