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#1
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Thermostat Question
Just bought a home with a bonus room upstairs - split unit AC.
Thermostat on the first floor was a 2 stage totaline P474-0100 and upstairs was a single stage manual robertshaw CM200. I bought two Honeywell 5-2 Day Programmable Thermostat's to replace both. Replacing the bonus room went well. When I replaced the totaline the unit would not engage (nor the fan). All contacts were solid The bonus room was a four wire (no Rc, just Rh). The first floor had a five wire and the totaline marked it "C" - matching it up to Rc on the honeywell (I also removed the Rh/Rc jumper). Everything appeared to be wired up correctly. First - the Honeywell YRTH230B1009 stated - "For single stage heating and cooling or millivolt systems" - so from what I read I took a step back from the 2 stage totaline moving to the single stage honeywell. Second - was there a reason why there was a 4wire single stage in the bonus room vs the 5 wire 2 stage on the first floor - would it cause the problems when I installed the second honeywell? TIA. |
#2
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Thermostat Question
Terminals RH and W are for heating and not used for air only. The four wire
system should work fine with that stat, but it sounds like doesn't have two stage capability, so it's the wrong stat for the other unit wrote in message oups.com... Just bought a home with a bonus room upstairs - split unit AC. Thermostat on the first floor was a 2 stage totaline P474-0100 and upstairs was a single stage manual robertshaw CM200. I bought two Honeywell 5-2 Day Programmable Thermostat's to replace both. Replacing the bonus room went well. When I replaced the totaline the unit would not engage (nor the fan). All contacts were solid The bonus room was a four wire (no Rc, just Rh). The first floor had a five wire and the totaline marked it "C" - matching it up to Rc on the honeywell (I also removed the Rh/Rc jumper). Everything appeared to be wired up correctly. First - the Honeywell YRTH230B1009 stated - "For single stage heating and cooling or millivolt systems" - so from what I read I took a step back from the 2 stage totaline moving to the single stage honeywell. Second - was there a reason why there was a 4wire single stage in the bonus room vs the 5 wire 2 stage on the first floor - would it cause the problems when I installed the second honeywell? TIA. |
#3
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Thermostat Question
RBM (remove this) wrote: Terminals RH and W are for heating and not used for air only. The four wire system should work fine with that stat, but it sounds like doesn't have two stage capability, so it's the wrong stat for the other unit Four wire originally wired - RH, W, Y & G and I matched it on the honeywell (RH/RC had a jumper) Five wire - RH, W, Y, G & C - matched it on the honeywill except I moved C to RC on the honeywell (removing the RH/RC jumper) So the totaline is the wrong one for my system? It's a single unit - how can I tell? TIA. |
#4
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Thermostat Question
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#5
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Thermostat Question
If all the listed terminals had wires on them, it would appear that this
unit does heat as well, correct? It has one transformer that powers both heat and cool, hence the rh-rc jumpers. I'm not seeing two stages though. The five wire, you need the rh-rc jumper reinstalled, but may not need the "c" for the new stat wrote in message oups.com... RBM (remove this) wrote: Terminals RH and W are for heating and not used for air only. The four wire system should work fine with that stat, but it sounds like doesn't have two stage capability, so it's the wrong stat for the other unit Four wire originally wired - RH, W, Y & G and I matched it on the honeywell (RH/RC had a jumper) Five wire - RH, W, Y, G & C - matched it on the honeywill except I moved C to RC on the honeywell (removing the RH/RC jumper) So the totaline is the wrong one for my system? It's a single unit - how can I tell? TIA. |
#6
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Thermostat Question
RBM (remove this) wrote:
If all the listed terminals had wires on them, it would appear that this unit does heat as well, correct? It has one transformer that powers both heat and cool, hence the rh-rc jumpers. I'm not seeing two stages though. The five wire, you need the rh-rc jumper reinstalled, but may not need the "c" for the new stat makes sense - thanks for the reponse!!!.. |
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