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Old 01-26-2013, 03:07 PM   #1
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Thermostat Replacement


Hi All,

I am replacing a wall thermostat for a Cadet wall heater with a programmable thermostat. My box has more wires than I was expecting - I need advise on how to hook it up.

The box:
2 black wires coming from the top of the box (electrical supply)
1 black wire coming from the bottom of the box (heater)
2 white wires from the top
1 white from the bottom
2 ground wires from the top
1 ground from the bottom

New thermostat:
1 black L1 wire
1 red L2 wire
1 black load wire
1 red load wire

Neither the box or the new thermostat have a green screw for the ground wires.

Previous setup with old thermostat:
Black top wire was connected to top black wire
Black top wire was connect to black thermostat wire
Red thermostat wire was not connected to anything and looked burnt
All 3 ground wires were connected and one was connected to green screen on thermostat.

Per instructions for the new thermostat:
Connect black wire from the top of the box to thermostat black L1 wire
Connect white wire from the top of the box to thermostat red L2 wire
Connect black wire from bottom of box to thermostat black LOAD wire
Connect white wire from bottom of box to thermostat red LOAD wire
Connect all ground wires.

Questions:
Is it okay just to have all of the ground wires connected and not connected to a green screw?

What do I do with the extra wires?
- Black from the top of box
- White from the top of the box

Thanks for the help!


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Old 01-26-2013, 03:18 PM   #2
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Thermostat Replacement


Connect all the ground wires together with a wirenut.

The "extra" black and white wires on the top are the continuation of the circuit to the next room. If you don't reconnect them back with the other wires on the top, the next room will be cold: They are feed-in and feed-out lines. Both black wires to L1 ... both white wires to red L2.

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Old 01-27-2013, 12:46 PM   #3
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Thermostat Replacement


Hi Kbsparky,

I connected both black wires that are coming from the top of the box to L1.....and both white wires from the top of the box to L2. Turned the power on and the thermostat isn't getting any power - the display is blank. And, the heater in the other bedroom also isn't working now. I checked the connection of all the wires to make sure that they were well connected, but still no power.

My old thermostat only had two wires - one black and one red. The way that it was connected before is that one black wire from the top was connected to the black wire coming from the bottom of th ebox. And the other black wire from the top of the box was connected to the termostat. Does knowing that change anything?

My new thermostat has the 4 wires that I menationed - these are the instructions for connecting it: http://www.cadetco.com/support/ownersguides/1024.pdf

Any ideas?
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