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.

Flair Thermostat Wiring Instructions

2-Wire Flair APOV2 Thermostat wiring diagram

Shown above, this 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

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

• FLAIR 3-WIRE TYPE WALL THERMOSTATS - wiring instructions

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 Q&A - also see RECOMMENDED ARTICLES & FAQs

Where do I Connect Wires when 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

 

Need Instructions for 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 thermometer is 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]

How do I wire a WR (White Rodgers) WR70 1F772 Programmable Thermostat when replacing an old Flair thermostdat?

It the 70 series 1F72

I've been 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 terminals.

• 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. 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

Explanation by (mod) - if your thermostat is White Rodgers it's not a Flair unit

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.

Followup 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

Moderator reply

The standard color codes at THERMOSTAT WIRING COLOR CODES might help you out,

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

see THERMOSTAT WIRING WHITE RODGERS for complete wiring details for your thermostat.\

by Johnny - I don't care about color of wires I care about the cross reference of the terminals

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

by (mod) - agree that in the field people don't always follow thermostat wire color code conventions

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.

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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

Thermostat Wiring & Installation Articles

• THERMOSTAT INSTALLATION STEPS - how to replace or install a new thermostat
• THERMOSTAT WIRING COLOR CODES & methods for identifying which thermostat wire is which if yours have lost their labels or have unclear color codes.
• THERMOSTAT WIRE CONNECTIONS detailed room thermostat installation & wiring guide for each heating or cooling system type and each thermostat brand / model
  • COMMON WIRE at THERMOSTATS
  • CONVERT LINE to LOW VOLTAGE THERMOSTAT
  • THERMOSTAT WIRE CONNECTIONS - 2-WIRE like the T87F
  • THERMOSTAT WIRE CONNECTIONS - 3-WIRE Red, White, Blue Wires
  • THERMOSTAT WIRE CONNECTIONS - 4-WIRE Red, Yellow, Green, White
  • THERMOSTAT WIRE CONNECTIONS - 5-WIRE Blue/Black, Red, White, Yellow, Green
  • THERMOSTAT WIRE CONNECTIONS - 6-WIRE Red, White, Blue, Yellow, Green, Orange Wires
  • THERMOSTAT WIRE CONNECTIONS - 8-WIRE Black, Red, White, Yellow, Green, Orange, Brown, Blue
  • THERMOSTAT WIRE SORTING to ID R W B
• THERMOSTAT WIRING OPENING SEAL
• THERMOSTAT WIRING in PARALLEL / MULTIPLES
• THERMOSTAT WIRE TERMINAL ID CODES / FUNCTIONS - what are the R, W, and other thermostat wire terminals used for?

Suggested citation for this web page

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

Or see this

INDEX to RELATED ARTICLES: ARTICLE INDEX to HVAC THERMOSTATS

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Citations & References

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

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