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#1
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thermostat compatibility for 2 zone hot water heating w/o zone valves
Hi,
I have an old 2-zone oil fired hot water heating system. I'm trying to replace one of the existing mercury thermostats with a Honeywell programmable one (CT3600). I just bought it from Home Depot and I'm reading the compatibility note on the package - it says it's compatible with hot water system of 2-wire-zone-valve but not with 3-wire-zone-valve. However, there are not zone valves on my heating system. There are 2 Taco cartridge circulators and the thermostats connect to a relay boxes that control the circulators. By the way, there are 2 wires on the thermostats, R and W. Can someone enlighten me in terms of whether this kind of system is compatible with the main stream programmable thermostats or it requires something special. Thanks. - Glacier |
#2
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thermostat compatibility for 2 zone hot water heating w/o zone valves
If your old t-stat has just 2 wires running to it, the swap will be
easy. Just a note, since your boiler system is a 2 zone system with 2 t-stats, you probably won't see very much energy savings by using just one programmable stat. If you are just doing it for your own comfort though, it should work fine. -Brian |
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