thermostat change out - http://www.hvacmechanic.com/ Forums
Original message
| ugaodie
 |  "thermostat change out"
, posted Fri 18 Feb 21:14  
old model is a Goodman HPTD18-60 and changing to a Honeywell RTH7400D.. Question #1- old thermostat has a blue wire to the COM post and new thermostat does not have any thing label like that. Question #2- does blue mean common like "ground"?
thanks for any help.
Fred Newsome
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Replies:
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| Xenos
Webmaster 
| "Re(1):thermostat change out" , posted Fri 18 Feb 23:18
There is a common terminal on the Honeywell thermostat, It’s the lower right one labeled C and yes it the opposite potential like ground.
Xenos.
The best way to escape a problem is to solve it.
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| | ugaodie
| "Re(2):thermostat change out" , posted Sun 20 Feb 08:58
thanks for the info, but i don't have a "C" at "the bottom right" as you said. What to do next?
Fred Newsome
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| | Xenos
Webmaster
| "Re(3):thermostat change out" , posted Sun 20 Feb 09:20
Oops. your right it'a on the top left on that model.
http://hbctechlit.honeywell.com/techlit/PDF/69-0000s/69-1726.pdf
Xenos.
The best way to escape a problem is to solve it.
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