Hello,

I am trying to install a line voltage programmable thermostat into a manual thermostat fixture. The programmable thermostat is Honeywell RLV430. Instruction manual here:

http://www.homedepot.ca/wcsstore/HomeDepotCanada/images/catalog/b7867367-6c05-4c82-a97c-648044b91564.pdf

The existing fixture has 2 red wires and 2 black wires, the thermostat has only 2 black wires.

My question is, which colored wire should pass-through? I think red, however would like to hear some expert opinion.

Please let me know.

Thanks!

If you are located in the USA, then the National Electric Code applies, and a 1 pole thermostat is not allowed for a 240 volt heater, because both hot legs must be opened when the thermostat is turned off and used as the required disconnecting means.

If you are in Canada, then I believe a 1 pole thermostat is allowed for 240 volt heaters, but best to check first with local code.

I would not ask the clerk at Home Depot for advice, unless that person is licensed or certified in the electrical trade.

Thanks tkrussel,

I am in Seattle, WA. I bought this thermostat as this is the only programmable thermostat available for baseboard heaters.

Can you recommend any other programmable thermostat for controlling electric baseboard heaters?

This article is still helping people 6 years on!