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Thermostat wiring reference chart - simplest case two-wire thermostat (C) Daniel Friedman How Wire a Flair Thermostat
Flair Room Thermostat Wiring Connection Tables

Thermostat wiring details & connections for the Flair thermostats. This article gives a table showing the proper wire connections for the Flair 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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Flair Thermostat Wiring Instructions

2-Wire Flair APOV2 Thermostat wiring diagram

Flair 2-wire thermosat wiring diagram at left the thermostat wiring diagram illustrates use of a Flair APOV2 wall thermostat in a typical 2-wire application controlling a heating appliance.

In this application the thermostat is acting as an spst (single pole single throw) switch to turn heat on or off, often by operating a zone valve.

When used to operate a zone valve the thermostat wires are connected to the zone valve terminals, not to a primary control on the heating boiler.

[Click any image or thermostat wiring schematic to see an enlarged, detailed version]


3-Wire Flair APOV2 Thermostat wiring diagram

Flair 3-wire thermostat wiring controlling a zone valve

Above the thermostat wiring diagram illustrates typical use of a Flair APOV2 wall thermostat in a 3-wire application controlling a heating appliance.

In this application the thermostat is acting as a single pole double throw (spdt) switch to control heating & cooling or in some zone valve applications.

Also see our table of Flair thermostat wiring connections found above at

 

How to Wire a typical Flair 3-wire type Wall Thermostat

(3 wires found in use at the wall thermostat)

Flair model ANOVO Thermostat fed from a Flair zone valve

(4)
As wire colors may vary, note the wire colors Wire coming from Flair zone valve terminal (4) "Open" . Note 1.
(5)
At the Flair zone valve and Wire coming from Flair zone valve terminal (5) "Common"
(6)
Match those colors to terminals at the thermostat as shown here Wire coming from Flair zone valve terminal (6) "Closed"

Notes to the table above

1. The [Honeywell 5-2 Day Programmable Thermostat - RTH2300B1012] thermostat cannot be used if your old thermostat had and used any two of the following wires: R, RC, RH, 4 and V.[5]

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.

 




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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

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]

On 2016-06-14 by Johnny

Mod thanks again
Definitely mis communication I don't care about color of wires I care about the cross reference of the terminals
On my 3 wire stat only 3 terminals on the replacement stat 8 terminals
Can anyone tell me what terminal on the programmable stat R C W2 E Y O/B G L would the wire from the old stat terminal 4 labeled open go to then same for terminal 5 labeled common and lastly terminal 6 labeled closed
my 3 wire go from the stat to flair valve so not concerned about wire color it's the same corresponding numbered terminals on the valve
Thank you for any help

On 2016-06-13 - by (mod) -

Yeah, Johnny, we noted in the article above that in older Flair to Flair thermostat to zone valve or to other equipment wire colors in the field varied from standard.

Typically the installer will simply use a VOM to find which wires are carrying voltage - those form the "on" switch function that helps start to sort things out.

On 2016-06-13 by Johnny

Sorry for confusion we are looking at the flair thermostat cause that's what I have now and am looking to replace with the wr 1F72
I have the directions for the 1F72 BUT they don't cross reference back to what I already have the Flair valve
So I am looking for guidance to go from 3 wire flair stat to the new wr 1F72

On 2016-06-13 - by (mod) -

Sorry I'm getting lost here. Why are we looking at a Flair thermostat wiring diagram when you're wiring a White ROdgers 70-1F772 thermostat? Where you posted this question on another page I suggested a link to our White Rogers thermostat wiring page and on that page link to a PDF with wiring details for your thermostat.

On 2016-06-13 by Johnny

Terminals on 70 series are R C W2 E Y O/B G L
I have 4 blk, 5 wht, 6 red

On 2016-06-13 - by (mod) - if your thermostat is White Rodgers it's not a Flair unit

The standard color codes at https://inspectapedia.com/heat/Thermostat_Tips.php might help you out

But a WR 70 sounds like a White Rodgers thermostat. If so,

see THERMOSTAT WIRING WHITE RODGERS

On 2016-06-13 by Johnny

It the 70 series 1F72

Looking at above typical Flair 3-wire wall type thermostat wiring diagram. I cannot find any guide to help me find which terminals to use with programmable thermostat
I have WR 70 series model 1F772 please help I have 3 wires like above diagram termina

l 4 blk wire = open, terminal

5 wht wire = common, and

terminal 6 red wire = closed

Please help on which terminals to use on the programmable stat I have manual does not give corresponding terminals from my application

 


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Thermostat Wiring & Installation Articles

 

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THERMOSTAT WIRING FLAIR INSTRUCTIONS 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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