Latest Discussions : Electrical & Lighting

Dawlmesh

12:25AM | 01/08/05
Member Since: 01/07/05
1 lifetime posts
I took out the old thermostat & now have a small problem with putting on the new one. Three cables come into the wall box for the control, each cable has three wires. The old thermostat had black wires from two cabels pigtailed to a black wire in the back of the control. The third black wire was wire nutted to a red wire in the back of the control. White & bare copper wires from each cable are wire nutted together.

The new programable thermostat has two black & two red wires coming out of the back. The reds are labeled "T1" & "T2". The black ones are "L2" & "L1".

No other heaters are on the circurt (though I would like to change that).

I'm confused which wires coming from the wall to attatch to which wires on the thermostat.

Wireman

12:23PM | 01/08/05
Member Since: 12/19/04
62 lifetime posts
Dawlmesh,

By your description it seems you have a line voltage thermostat controlling a 120 volt heater. If this is correct I am assumming that the two black wires tied together are hot and you would connect these to L1 on the thermostat. The single black wire goes to the heater and it would be connected to T1 on the thermostat. L2 and T2 aare used for a 220 volt heater so you are breaking both legs to the heater. This is especially important if the thermostat has a "off" position. You would not want to have a "hot" leg still going to the heater in the "off" position. The white (neutral) wires are wirenutted together as are the ground wires. If the thermostat has a ground connection you must run a pigtail from the gound wires to the thermostat. Hope this helps, otherwise repost.

Ron


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