Original message
| RAC
 |  "Thermostat change over mercury to digital"
, posted Fri 28 Oct 15:52:  
Can I replace a mercury switch BDP model #P271-3456 similar to the Goodman/Janitrol model #HPT18-60 are these thermostats comparable 2 stage heat & 1 state cool? I can't find any literature on these models(4-wires only G=Fan relay / Y=Compressor relay / B=1st stage Heat / R=24vac return) upgrade to digital programable type either LUX model #PSPH605 or Carrier model #33CS250-01 The Carrier wiring diagram shows 6 wires. Is there any jumpering I need to do? for C=24vac common or W2=2nd stage Heat? Or is there something you can suggest?
Keep asking until you figure it out! Take it one attempt at a time.
[this message was edited by RAC on Fri 28 Oct 15:55] |
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| skyjohnny1
| "Re(1):Thermostat change over mercury to digit" , posted Sat 29 Oct 20:01
4 wire thermostat is not a dual stage thermostat.
remote thermostat which has two stage heat and one stage cool is design specifically for the heat pump system with more efficiency and Auxilliary heat add to the system.
what i recommend u is study the schemetic from ur system b4 u change the thermostat.. otherwise bad connection will have faulty performance
study for hvacr bs degree
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| krinst
| "Re(1):Thermostat change over mercury to digit" , posted Sat 29 Oct 11:27
break it down a little more. what type of unit(s) are you trying to operate? How many wires are at the existing stat? what are they hooked to?
Kevin
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| | RAC
| "Re(2):Thermostat change over mercury to digit" , posted Mon 31 Oct 18:14:
4 wires hooked to: G / Y / R & B
Keep asking until you figure it out! Take it one attempt at a time.
[this message was edited by RAC on Mon 31 Oct 18:20] |
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