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

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SECO TA2000 to Honeywell RTH7000 wiring diagram

I am trying to wire in a Honeywell RTH7000 thermostat but I cannot get the heat or the AC to come on. The fan works fine and the thermostat kicks on and off. I must have some wires off somewhere. I cannot findout what X and O or for on the SECO and where they go on the Honeywell.

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  • CaptainJava Jan 04, 2009

    same problem but trying to go from the SECO TA2000 to the LUX. No X on the Lux and nothing in the manual about it.

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I found one answere where X goes to C.

Posted on Jan 04, 2009

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Replacing a TA2000 WITH RTH6500fw


the terminals where the wires go should be marked with letters put them back on the new t-stat matching the letters c is common on heatpump white and yellow should be jumpered togeather and if your new stat has rc and rh they should be jumpered and on heatpump there should be either an o or b hooked up but not both this is for shifting heat or cool
normaly red to red 24v hot...green is indoor fan....yellow is compressor and or white also....blue is reversing valve energize for heat orange is energize for cooling ...and black or brown is common which is neutral or ground for the 24volts

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I am changing from a Seco control thermostat model # tb1540e-g to


Rc/Rh should be from the transformer if a single transformer system. If its'a dual transformer system, then there should be a red wire to each from it's respective unit (furnace=Rh, condensor=Rc.).
W should be heat.
Y Should be cooling.
G should be fan.
I am not certain what E is, unless the stat can be used on a heat pump with backup electric heat, in which case it's for the electric heat.

The reason I say should be, is because if you are looking at wire colors, and not terminal designations, there is no guarantee the control wiring was connected following normal convention.

Reply back of any further questions.

Feb 03, 2009 | Honeywell Programmable Thermostat Heater

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Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

Jan 30, 2009 | Honeywell Programmable Thermostat Heater

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your old thermostat is a milivolt and the wire runs from the heater to the thermostat. You have to open the back of the new one and connect the wire as per the instructions on the wireing diagram that came with the new one. I just installed a similar one myself, you will be very happy with it.

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I had an old thermostat that i had to change need wiring diagram


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
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I had an old thermostat that i had to change need wiring diagram


both thermostatats will have terminal designators R,W,Y,G, possibly O/B, C, W1,W2, Y1, Y2, etc.
Simplest method is to remove wires from old stat one at a time. mark where they came from and then install at same desinated terminal on the new t-stat. Hope this helps. be sure to shut off power supply to the unit (furnace) first. The wire coming to the R (RH,RC) terminal is the 24 volt a/c hot, all others are feeding back to perform given function.

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1 Answer

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check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats

Oct 26, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

I have a gas fired furnace with only two wires comming from the furnace and i bought a new honeywell rth7000 thermostat and it does not give me a wiring diagram for two wires


which colors are they? one should be from the igniter that goes to W on the thermostat and the other goes to Rc just make sure that the one from the igniter goes to W

email me if you need additional help hvac.tech7872pr@gmail.com

here's some additional instructions if you need them:

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2104ES.pdf

May 04, 2008 | Heating & Cooling

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