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OK - new member here - wished I had checked this forum sooner as there was a thread in 2003 that *almost* answers my question completely. Here's the story:
- moved into a new house (16 years old)
- want to replace the old "round" honeywell thermostats (one upstairs and one downstairs) with programmable ones (have done this before in prior houses with no big deal)
- purchased "universally compatible" honeywell t-stats (RTH7400) from home depot. Went to replace the lower level t-stat and found O and B wiring (I was informed by honeywell that the RTH7400 would not work (they couldn't tell me why - just that I had to have a contractor install a t-stat given the current one has B and O wires)
I have the following wiring config (along with general info on my systems):
Manufacturer of old thermostat: Honeywell
Model of old Thermostat: T87F 3715 3
Model of old Subase: Q539A1436
Type of heating system: Oil Warm Air
Voltage going to thermostat: 24
Air Conditioning? yes
The number of wires going into old thermostat (donwstairs): 6 (R, Y, W, G, O, B).
The number of wires going into 2nd old thermostat (upstairs): 3 (W, P, Y).
I thought I had it figured out, found LuxPro t-stats that hande separate O and B wires; ordered two of the Lux t-stats - unfortunately before I figured out the upstairs is different and I have a master/slave config. Lux customer service was incredibly responsive and helpful - unfortunately they don't have a slave programmable t-stat.
I have already purchased the following (actually two of them):
LuxPro PSP711TS Touch Screen Thermostat
Single Stage Heat/Cool, Programmable
Specifications
Heat/Cool Terminals: RH, RC, O, B, W, Y, G, C.
I still can use one for the downstairs master.
Question: what should I get for the slave (Upstairs) - I want to have a programmable t-stat for that one as well - is that even possible?
ALSO: should I return the Luxpro and buy both the master and slave from one vendor so I don't have to learn two different T-stat user interfaces?
I'm almost to the end line on this one! any help is much appreciated!
- moved into a new house (16 years old)
- want to replace the old "round" honeywell thermostats (one upstairs and one downstairs) with programmable ones (have done this before in prior houses with no big deal)
- purchased "universally compatible" honeywell t-stats (RTH7400) from home depot. Went to replace the lower level t-stat and found O and B wiring (I was informed by honeywell that the RTH7400 would not work (they couldn't tell me why - just that I had to have a contractor install a t-stat given the current one has B and O wires)
I have the following wiring config (along with general info on my systems):
Manufacturer of old thermostat: Honeywell
Model of old Thermostat: T87F 3715 3
Model of old Subase: Q539A1436
Type of heating system: Oil Warm Air
Voltage going to thermostat: 24
Air Conditioning? yes
The number of wires going into old thermostat (donwstairs): 6 (R, Y, W, G, O, B).
The number of wires going into 2nd old thermostat (upstairs): 3 (W, P, Y).
I thought I had it figured out, found LuxPro t-stats that hande separate O and B wires; ordered two of the Lux t-stats - unfortunately before I figured out the upstairs is different and I have a master/slave config. Lux customer service was incredibly responsive and helpful - unfortunately they don't have a slave programmable t-stat.
I have already purchased the following (actually two of them):
LuxPro PSP711TS Touch Screen Thermostat
Single Stage Heat/Cool, Programmable
Specifications
Heat/Cool Terminals: RH, RC, O, B, W, Y, G, C.
I still can use one for the downstairs master.
Question: what should I get for the slave (Upstairs) - I want to have a programmable t-stat for that one as well - is that even possible?
ALSO: should I return the Luxpro and buy both the master and slave from one vendor so I don't have to learn two different T-stat user interfaces?
I'm almost to the end line on this one! any help is much appreciated!
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