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Wiring a Honeywell CT60A Heat only Thermostat

Two black wires on thermostat - L1 AND T1 20 amp wiring leading into box - red and black leads 20 amp wiring leadng out of box - red and black leads Do I connect two red together to one thermostat wire and two black to other and does it make a difference if it is L1 or T1

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Posted on Jan 02, 2017

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  • 205 Answers

SOURCE: wiring on thermostat tl7235a1003

OK, here's my guess at this...I hope someone more knowledgable will confirm or correct me.

A line voltage thermostat switches the power to the baseboard heater. In other words, it's just like a wall light switch except it activates and deactivates based on the temperature.

I think your old model CT62 was wired exactly like a light switch. The hot wire to the light is broken then run to the wall switch and then back to the light so there's no neutral wire at a light switch box. This worked fine for your CT62 because it did not need power, it only needed to switch it.

The new model TL7235A1003 requires electrical power because it's programmable so you need both a hot wire and neutral wire at it's installed location. In addition you also need 2 wires leading to the baseboard heater so the thermostat can supply it's power.

I believe L1-L2 are to be connected to the hot/neutral wires, and the Load wires go to the baseboard heater.

If I am correct you will not be able to use this thermostat without some re-wiring.

Good luck.

Posted on Nov 27, 2007

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SOURCE: 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.

Posted on Dec 23, 2008

  • 71 Answers

SOURCE: Help - I am trying to install a honeywell RLV4300A

You will have to have schematics from the old wiring diagram. Then you will have to confirm its consistency with actual old wiring before you can be sure that the wires run to the proper places on the old heater and a/c system. This sounds like a gas furnace and is simpler than a heatpump. Once you know what distinguishes the wires with the same color, you should label them and then you may call them a different color if they were wired with wrong wire colors. You may be in luck if you go to the furnace control box an look at the terminals.. They are usually labeled with a R for Red and W for white and Bl for Blue and B or Black. If you have other colors on these then it sounds that it was wired with wire spare wire by someone who knew what they were doing but neglected to leave a path for someone else follow.
You may be able to use a continuity tester of circuit tester to id these wires that are in question...
ie, once indintified, you can match with the requirements of the new stat.

Posted on Jan 13, 2009

tborn6
  • 700 Answers

SOURCE: Household Thermostat Replacement

you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck

Posted on Jan 25, 2009

tborn6
  • 700 Answers

SOURCE: Trying to install new Honeywell TH8110 thermostat

ALL OF TEM
EXCEPT L

Posted on Mar 07, 2009

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Wiring on thermostat tl7235a1003


OK, here's my guess at this...I hope someone more knowledgable will confirm or correct me.

A line voltage thermostat switches the power to the baseboard heater. In other words, it's just like a wall light switch except it activates and deactivates based on the temperature.

I think your old model CT62 was wired exactly like a light switch. The hot wire to the light is broken then run to the wall switch and then back to the light so there's no neutral wire at a light switch box. This worked fine for your CT62 because it did not need power, it only needed to switch it.

The new model TL7235A1003 requires electrical power because it's programmable so you need both a hot wire and neutral wire at it's installed location. In addition you also need 2 wires leading to the baseboard heater so the thermostat can supply it's power.

I believe L1-L2 are to be connected to the hot/neutral wires, and the Load wires go to the baseboard heater.

If I am correct you will not be able to use this thermostat without some re-wiring.

Good luck.

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