Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

1 Answer

I have a heat pump with a Honeywell Q674L 1207 thermostat on it. The wiring on the current thermostat is O, G, R, Y, a white wire to W2 which is jumpered to E and a brown wire to X. What is the right configuration to replace the thermostat with the newer Honeywell RTH7600D? Thanks

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 24 Answers

What color wires are on each terminal?

Posted on Oct 06, 2010

  • saleitem Oct 06, 2010

    On my current Q674L, it is

    O, G, R, Y, a white wire to W2(jumped to E) and a brown wire to X.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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

2 Answers

Need help understanding how to wire a new programmeable thermostat. I currently have a White Rodgers 1F73 model (non-programmeable) connected. I am confused with the instructions on how to connect the...


the black wire is your common wire, you need to program your thermostat, in the advance mode, to tell the t-stat if your heat pump reversing valve is energized on cooling or heating, is the orange wire connected to your t-stat.= w2/o/b

Dec 20, 2014 | Honeywell Heating & Cooling

1 Answer

How do you relpace an A.C. thermostat?


E Back up heat/ white wire
AUX Jumper to E
Y yellow wire / Cooling - compressor
G Indoor fan Green wire
O Reversing valve energised in cooling most units Orange wire
L unknown. consult your manual Leave open
R Main power Red wire
B Reversing valve energised in Heat Rheem units only.
C Common second leg of power Blue wire.

Aug 30, 2014 | Honeywell RTH3100C - Digital Heat Pump...

2 Answers

W and W2 wiring on old thermostat...where do they go on the new thermostat?


It depends on the equipment you are connecting the thermostat to. If you have a heat pump, the thermostat must be wired differently than if you have separate heating and cooling equipment. If you have a two-stage or modulating furnace (or boiler), the w and w2 wires will conect for heating, and the y and g wires will connect to the air conditioner. Naturally, some configuring must be done with the new thermostat so that it acts correctly. w-w2-wiring-old-thermostat-go-new-u40lsvyytnuesyuv3fbafhtd-1-0.jpg
please mark this answer helpful.

Feb 22, 2013 | Honeywell RTH6400D 5-1-1-Day Programmable...

1 Answer

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

Wiring honeywell th8320u1008


Be sure you are looking at the letters set up for heat pump. Orange should be "O". Remove jumper between w2 and e. Then be sure you have the settings correct in the tstat for a heat pump with back up heat. Good Luck!!

Mar 28, 2017 | Heating & Cooling

1 Answer

Need wiring diagram for Honeywell RCT8100


The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

Apr 02, 2010 | Honeywell Electronic Programmable...

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

2 Answers

Thermostat Wiring: W2? E? Where to connect?


You have a heat pump. You need a thermostat for "Heat pump with Electric back-up heat". Make sure the 'stat has either an "aux" (auxilliary heat) or an "E"(Emergency heat) terminal. The wiring instructions will be provided with the thermostat.

Dec 15, 2008 | Honeywell Electronic Programmable...

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

638 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

paulcarew

Level 3 Expert

2458 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...