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Model: TRANE XE80	Brand: -other-	Age: More than 10 years
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officework13		#1 Posted : Monday, March 10, 2014 11:43:35 AM(UTC)
Rank: Member Groups: Registered Joined: 3/15/2011(UTC) Posts: 14		i have a trane xe80 furnace about 13 years old. air conditioner installed about 8 years ago. programmable thermostat - also 13 years old Everything works good EXCEPT. when i turn the thermostat to 'ON' from auto nothing happens. (i.e. the fan does not run) i want to leave the fan on all the time to circulate the air. at one time the fan "on" worked, and it also worked after i had the AC installed as well. perhaps the thermostat is shot. any pointers on testing this. i have some electrical skills and understand most principles and know how to use a volt meter and that it is not a good idea to stick a knife into an electrical socket.


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officework13		#2 Posted : Tuesday, March 11, 2014 12:59:07 PM(UTC)
Rank: Member Groups: Registered Joined: 3/15/2011(UTC) Posts: 14		see attached picture OK, so i looked at the wiring and think i know what is likely wrong. 4 wires go to the thermostat. Red to R Green to G Purple to Y Black to W with thermostat on auto i have 24 Vac from red on thermostat to each of the 3 wires, turn thermostat from Auto to on and voltages to green drop to near zero. checked out furnace wiring. there are 3 sets of wires as follows Wire 1 - to thermostat Red to R, Black to W, Purple to Y, Green - taped off (not used). Wire 2 - to air conditioner Black to Y, Red to C Wire 3 - to exhaust fan Black to R, Red to G So how this is set up from my understanding is that the fan kicks in when we turn on the exhaust fan. However, i want to be able to turn on the blower fan without turning on the exhaust fan. in winter i am loosing heat by doing this, and in summer i am loosing cool air. my question, can i hook up the green wire (from the thermostat) to the circuit board (G) so i can use the thermostat to run the blower without turning on the exhaust fan. officework13 attached the following image(s):


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