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Duo therm thermostat

Home > Discussion Forum > Mechanic's Corner (general)

Email Author email Brad Purcell  Reply to Message reply to message  Post New Message post new message      search forums
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Duo therm thermostat Brad Purcell 6-29-09  
In order for my AC to run I have to adjust my thermostat down to 55 degrees. The unit runs fine and cools and cycles on and off but the actually temp is around 70 degrees. Is the thermostat bad? Was going to replace the thermostat but not sure of the wiring. The old is the Duo therm analog thermostat and not sure what the wire conected to + 7.5 block is and is the one connected to Gnd the ground? Will any generic analog thermostat work?
Re: Duo therm thermostat William A. Hendrix 6-29-09  
The 7.5V usually Red wire is the current from the transformer on the upper control board and GRD is a Ground so a voltmeter between the two should give you 6.5 to 8 volts. The potentiometer (the slide temp adj) is not very durable as it is mostly exposed and easily contaminated. You can try to clean - remove the cover (with all off) and use compressed air like keyboard cleaner, move up and down several time while cleaning. Probably have a 50/50 chance of improving. If not, replace - not very expensive. I dont know if a generic analog will work - havent tried as the replacement is cheap - like $40. or so --- I can provide one if you cant find. William
Re: Duo therm thermostat merle tofte 7-8-09  
I cannot find model number is it on roof
Re: Duo therm thermostat lorenzo haigh 8-7-09  
When the thermostat is set at 90 it shuts off at 76. is it just the thermostat or can it be something else?

thank you
lc.haigh
Re: Duo therm thermostat lc haigh 8-9-09  
When the terrmostat is set at 90 it shuts off at 76 is it just the thermostat or can it be something else?

thank you
lchaigh
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