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Old 10-10-2011, 08:38 PM   #1
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thermostat wires


new thermostat honeywellCT50K has letters for wire connection. old thermostat has no letters just1 black 1 white wire.How do you connect them.

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Old 10-10-2011, 08:40 PM   #2
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thermostat wires


How thick are those wires?

What are you controlling with this thermostat? Electric heat?

You can not use this model for line voltage control of electric heat units.

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Old 10-10-2011, 08:44 PM   #3
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thermostat wires


The wires are quite thin and are connected to the back of our old thermostat.We need to hook them up to new thermostat but dont know which wire is which because new thermostat uses letters on connections and old one does not.It is the proper thermostat, purchased at rona.It is a gas heater.
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Old 10-10-2011, 08:51 PM   #4
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thermostat wires


I'd repost this over in the HVAC area for a more definite answer, but I believe one wire goes to RH or R, whichever you've got, and the other to W. For such a simple connection, I don't believe it matters which wire is which.
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Old 10-10-2011, 09:15 PM   #5
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thermostat wires


With only 2 wires, it really doesn't matter which one is which.

You want to use the R and W terminals for heating on a 2-wire system.
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Old 10-10-2011, 09:29 PM   #6
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thermostat wires


wires - thermostat
Black- R/RW
White- W

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