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Honeywell thermostat T874R 1579 Subbase Q674L 1579 has letters O W2 E G R C L Y wire to a Carrier 50NQ-024 Heat pump 1 stage cooling 2 stage Heating wire colors red blue green yellow white

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: My Honeywell thermostat T874R is

The above was posted by fixr1st

Posted on May 29, 2008

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koolbreezes
  • 540 Answers

SOURCE: i have a honeywell focus

W== heat which we'll call this w-1! w2== second stage!

Posted on Sep 04, 2008

SOURCE: Hunter 44100A programmable thermostat

Sorry Iasumed you had a heat pump t-stat. You will need to exchange to a heat pump t-stat

Posted on Sep 28, 2008

  • 2 Answers

SOURCE: I have a Ruud thermostat want to change to totaline p274-0200-c

new stat
S1
S2
O/W2/B
R
C
Y/Y2
G
W/W1

Thanks for your help

Posted on Nov 25, 2008

  • 306 Answers

SOURCE: I'm installing a Honeywell RTH7600B

Every thing the same except take your blue wire and replace the yellow for it. So when you hook it to t-stat goes like this

Red to R
White to W
Green to G
Blue to Y


Posted on Jan 16, 2009

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1 Answer

How can I connect an Intertherm furnace with a heat pump to a new Honeywell thermostat?


Ensure that that thermostat is for a heat pump and has connections for the emergency heat strips.

Feb 02, 2016 | Heating & Cooling

1 Answer

I want to replace a Honeywell Q674L with a Honeywell RTH6580WF for my heat pump. Which wire is the common or C wire?


The old mercury Q674's didn't require a common terminal, so if there's not an extra wire in the bundle you'll have to fish one up... Inside the old Trane, there should be either a terminal strip with the appropriate terminal designations or possibly a bundle of color coded wires. If they are wires, originally they may have had individual tags on them, but if there are none, you're going to have to refer to the wiring diagram for the correct color for transformer common. Or... find the secondary of the transformer to determine the correct one, then extend it up to the new digital stat.

Apr 17, 2015 | Heating & Cooling

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Carrier OEM to Honeywell Programmable Tstat - NEED HELP


you likely have a "two stage" system, but not a two stage heat pump. the first stage is probably the heat pump itself, and the second stage is the auxilliary resistance heat that suppliments the heat pump at lower temps. if i knew the terminals that are available on the new stat, i could advise you on the proper wiring.

Jan 27, 2013 | Carrier Heating & Cooling

1 Answer

Where does the W2 wire go?


w2 wire is second stage heat does your furnace have two stages.look at gas valve it would have 2 valves/ sol w2 will go to w2 on stat. if a single stage furnace w2 is not used

Jan 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Wc wiring on thermostat


sounds like you have a heat pump the w2 on old thermostat is for a second stage heat. If you can give me a little more information on type of system you have (forced air furnace with heat/cool, Heat pump or boiler)? How many wires are on old thermostat? Is it a no programmable or programmable? How old is the furnace?

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

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My Honeywell thermostat T874R is showing the EM heat indicator light when I turned the AC on for the first time this season--Why? House is warm but not humid.


The T874R thermostat should be a heat pump thermostat. EM means emergency heat which you obviously are not using. That means that you just need to determine if your heat strip is on while you air conditioner is working. If so you may need to replace your thermostat or you heating relay or sequencer.

May 27, 2008 | Honeywell Heating & Cooling

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