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Old 11-13-2010, 09:51 AM   #1
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Thermostat replacement

I'm looking to replace the thermostat in my condo with a digital programmable (possibly a Honeywell from Canadian Tire). The current one is a Danfoss RET-24 (24V version) and the current configuration for it is:

Black wire to -> Rc/24V~
Red wire to -> Rh/24V~
Green wire to -> W/On
Brown wire to -> Y/Off

The thermostat controls the in-floor radiant heating in our condo and that's it. So a few questions.

1. Can I use one of the Honeywell's from Canadian Tire, such as Honeywell Touch Thermostat, 7-Day?

2. Would there be anything unique about how I have to hook it up? The whole Rc/24V~ things confuses me as this thermostat doesn't control any cooling unit (which from what I gather Rc stands for). Would I jumper Rc and Rh, or is that even where the black and red wires would connect?

3. I've shut off my all my breakers and the light on the thermostat still stays on, so I'm guessing the power is coming from somewhere else in the condo complex, is that a problem when installing the new one?

Thanks for your help.


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Old 11-13-2010, 10:52 AM   #2
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It is not nearly as simple as changing the thermostat. There is a seperate power source to it and if you damage the wiring/circuitry the condo board/owners/maintenance dept is going to charge you for the damage. I would check with them and see if other condos are interested in setback tstats and get the proper contractor to do it for you. Probably get a better group price. They may not want setback tstats as when too many units cut in at the same time in the morning it can overload the boiler (won't be sized for a huge sudden load) and then everyone will be without proper heat. Radiant systems are designed to run continuosly for even comfortable heat and not sized for fast recovery.


"Cut it twice and it is still too short".

Last edited by yuri; 11-13-2010 at 10:55 AM.
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Old 11-13-2010, 02:10 PM   #3
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Looks like you have a power open power close valve. that stat is not designed for that application.
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