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Replacing thermostat for radiant ceiling heat with a programmable unit.

Replacing thermostat for radiant ceiling heat with a programmable unit.


Old 10-16-10, 05:19 PM
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Join Date: Jan 2010
Location: USA
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Replacing thermostat for radiant ceiling heat with a programmable unit.

I have a room with electric radiant ceiling heat controlled by an
older Honeywell, two-wire, non-programmable thermostat. I can't find
the model number but it looks like this:

I would like to replace this with an internet-enabled unit but can't
seem to find one. My next choice is a programmable unit.

First question: Any recommendations? Ideally, I'd like 7-day
programming capability.

A bit of online research seemed to indicate that the Honeywell TL8230A1003 (Honeywell TL8230A1003 Digital Programmable Line Voltage Thermostat With Pre-Set 7-Day Program) might be a good choice. The only downside seems to be the lack of a battery backup.

Second question: Will I be able to wire this into my system. I checked
inside the box that mounts the current thermostat. In addition to the
saftey ground wire, I have two red, a dark purple and a black
wire. All are the same size. With the current thermostat, L1 is
connected to one of the red wires and T1 is connected to the
purple. The black wire and second red wire are connected.

What threw me was that the two red wires enter from one port on the
box and the black and purple enter from another. The instructions for
the TL8230A1003 seem to indicate that a black and red should enter
together (line side) and another black and red should exit together
(load side). Any issues with this?

Thanks for the help!
Old 10-16-10, 06:20 PM
Jay11J's Avatar
Join Date: Sep 2001
Location: Rochester, Minnesota
Posts: 18,427
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I think the program will stay in the stat if the power fails.

ANother one you can look at Home Depot can work too.

Can't always go by color on the wires. Just hook it up same as the old one was.

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