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

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

I had the thermostat (old) was the seco control ta2000 and am now tring to change to a honeywell non programable thermostat the code is rth3100c can you give a wiring diagram to help?

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HONEYWELL WEBSITE:
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

Posted on Sep 13, 2009

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carefully follow the below steps;

Turn off the circuit breaker that controls the air conditioning system. Turn the thermostat to the "On" position to make sure that all power is cut off and the air conditioner cannot accidentally operate.
Remove the cover of the existing thermostat and remove the colored wires from the terminals. Take out any screws that secure the thermostat to the wall, and remove the thermostat.

Mount the new thermostat on the wall. Feed the wires through the unit, with enough slack to allow you to make the new connections.

Connect the red wire to the thermostat terminal labeled "RH," "RC" or "R." The red wire carries the power from the transformer.
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Close the thermostat's cover and turn the breakers back on. Turn the new thermostat to the "On" position to test it and that would be all.

I hope the above helps. If it is not helpful, please let me know so that I may direct you further.....

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  • Green to the thermostat G terminal. This is the color that controls the fan or the relay that control of the blower.
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Here is the link you can copy and paste in your browser: They also have every other model here to:

http://highperformancehvac.com/thermostats_2.html#new_thermostat_installation

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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.

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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

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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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