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

2 Answers

Old thermostat wiring doesnt match up with new thermostat

My old wiring was as follows: G, C, R, Y, O, W2 (with jumper to E) My new thermostat is a Honeywell RTH7600 and I have no clue how to wire this. I wired it the way that I though it would go, but the heat comes on when the a/c is supposed to be on and vice versa. I'm assuming that a couple of wires are backwards, but I dont know which ones.

Posted by on

  • 2 more comments 
  • kdlucas Dec 06, 2008

    This T-stat is fully digital. So there are setting in which I can change for different systems such as heat pump w A/C, heat only, A/C only, etc. I have changed them, but the heat is still coming on when the air should be. I am more concerned with the original wiring not being the same for this T-stat versus the old one. On the new one there is a section labeled "Heat Pump" and one labeled "Conventional." If I use the heat pump labeling, then there is one wire left, W2. the W2 area on the T-stat is under Conventional.

  • kdlucas Dec 06, 2008

    It is all electric. I have an air handler inside and one outside unit. It is a heat pump

  • kdlucas Dec 06, 2008

    The wiring is just like the old T-stat except that the old one had the white wire going to W2 and E. 


    Old wiring:
    Orange - O
    Green - G
    Blue - C
    Red - R
    Yellow - Y
    White - W2 & E
    Orange - 0




    New wiring:
    Same, except that the diagram on the plate has an outer list of terminals and an inner list. The outer is "Heat Pump" and the inner is "Conventional" I have it wired on the heat pump list, but there is not a W2 on the heat pump list so i have the W2 wired on the conventional list.

  • kdlucas Dec 07, 2008

    I changed a few of the digital setting, being that this thing is totally digital. It seems to be fine and will blow cold and hot when supposed to. I left the white on the W2 side with a jumper to the E as it was on the old T-Stat. I appreciate all of the help and for being so quick.
    Thank you.

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 334 Answers

Look at the instuction booklet (or on the T-stat board) for a switch for the reversing valve.

Some systems reversing valves are in cooling mode when energised, some are in cooling mode when NOT energised.
You are looking for the switch (Usually very tiny, or a different jumper setting) that will change the position of the reversing valve when calling for heat/AC.

This is not a switch like the typical "ON OFF AUTO, HEAT COOL EMG HT switches. It will be on the board itself or the back of the T-stat.

Posted on Dec 06, 2008

  • Danny Clark
    Danny Clark Dec 06, 2008

    Do you have a heat pump or a gas furnace? Is it an electric furnace?



    What wire is left over, what wires are you currently using on what terminals?

  • Danny Clark
    Danny Clark Dec 06, 2008

    Ahhh thats your problem, disconnect the white from the conventional side and let me know what terminals are on the HP side.

×

  • Level 1:

    An expert who has achieved level 1.

    Governor:

    An expert whose answer got voted for 20 times.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 4 Answers

After you selected function 170 and set it to 7, your next function to set is 190( this is for your heat pump changeover valve) If you wired "O" to your O/B terminal, set 190 to 0, then press DONE. This should correct the problem.

Posted on May 05, 2009

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 am replacing a 10 year old Honeywell Thermostat with a mercury switch with a new programable digital Honeywell OS#RTH7500D1007 MD 0638. There a 4 wires coming out of the wall and are installed on the old...


You are on the right track, you can hook the same 4 wires to the new thermostat without the jumper you had on the old thermostat. The jumper wire that is on the new thermostat can stay with no problems. Just connect the wires to the same terminals on the new one and your good to go!

May 10, 2011 | Honeywell Electronic Programmable...

1 Answer

I am wiring a honeywell thermostat model number ct87n if I select fan on the fan runs when out on auto /heat nothing but if I put on auto / cool and adjust the dial to a low setting the hea comes on....


there is it all depends on how many strands of wire are in there, they start at 2 wire and go to i think 8 wire and maybe more.
The wires are as follows:
1. red = power to stat.
2. green = fan control
3. blue or yellow = ac
4. white = heat
w1 = 1st. stage heat
w2 = 2nd. stage heat.
i am on line if you have any questions. wally

Feb 22, 2011 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

I have 2 Honeywell TH5220D thermostats installed in my house & want to replace 1 with Honeywell TH6220D 1028. The wiring on the existing thermostats is as follows (a jumper wire from Y2 to W2,1 wire...


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Apr 06, 2010 | Honeywell Electronic Programmable...

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

Heat PumP: Rheem Two Stage Heat, One Stage Cool Thermostat Replac


R = R with jumper to RC hot side of transformer
B = Reversing valve
Y = Compressor relay
G =Blower
C = common on transformer (X on old t'stat)
W2 = Auxillary heat
E = Emergency heat

Mar 04, 2010 | Heating & Cooling

1 Answer

Old wiring looks like this yellow =y1 green =G white=w2 orange =O blue=C red=R installing a Honeywell RTH7600 where does the orange wire go we have a heatpump.L


If you have a heat pump, the thermostat that will operate it most generally will have an "O' terminal for the orange wire, this is the circuit that energizes the reversing valve on the heat pump, be sure that the stat says heat pump on the box. hope this helps

Nov 02, 2009 | Honeywell Electronic Programmable...

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

3,587 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

2047 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...