Thermostat Wiring - no markings


Old 03-19-05, 03:01 PM
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Join Date: Feb 2005
Posts: 49
Thermostat Wiring - no markings

We are attempting to install a Honeywell CT2800 programmable thermostat. The new instructions tell us to mark the wires by letter on the old stat, but not according to colour.

The existing stat is a mercury job, with no letter markings for the wires. Presuming the black wire is the power wire, where does the white wire go? The furnace is gas powered, without air conditioning.

Thanks for any help.
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Old 03-19-05, 03:07 PM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,389

With 2 wires Id put the Black on R and the white on W

Old 03-19-05, 03:12 PM
Thread Starter
Join Date: Feb 2005
Posts: 49
Perfect! We suspected as much, but didn't want to take a chance.

Thanks for your speedy response. It's amazing how chilly it's getting so quickly ...

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