My new home has single-zone central A/C and three-zone hot water baseboard heating. The manual A/C thermostat and one of the manual heat thermostats are near each other. Can I replace these with one combined programmable thermostat or do I need a programmable heat-only thermostat and a programmable cool-only thermostat?
Thanks for your help!
Replies
You can use a single programmable thermostat to replace the cooling thermostat and the heating thermostat that is next to it. Then, replace the other two thermostats for the baseboards with programmable heat-only thermostats.
In order for a combination AC/HW programable thermostat to work correctly both the ACand HW zone control will have to have a common control transformer. If they don't I can see where you might end up connectiing separate control transformers in series and put 48 volts across the thermostat. It might not like that. Roger
You can use any of several stats that have both an "RC" and "RH" terminals. These stats are already set up for just this application. Follow the wiring diagram in the instructions and be careful to keep heat and cool strsight. I personally like Honeywell.http://customer.honeywell.com/honeywell/ProductInfo.aspx/TH6320U1000
Thanks Steve! Your message and the Honeywell documentation answered my question perfectly.