Hi! This is my first post here...
I have to go to a clients house in the morning and he's giving me a hard time about this...and i've talked to some other shops and no one seems to be able to give me a clear direct answer for this. I'm hoping someone here can help.
On newer homes...there is an exhaust ventilation fan that turns on the furnace fan as well. When the client turns on the vent switch on the main floor...the central air comes on...with the vent fan..which it shouldn't. I'm assuming this is feeding back a voltage back up through the thermostat G wire and hitting Y. I know that i need to install an isolation relay to solve this..i just don't know where...or what connects to the coil...and what connects to the normally open or closed. Does anyone out there have a diagram or can help me? I need to go there in the morning...and i really need help with this.
Please and thank you.
[Edited by desol on 07-14-2006 at 01:31 AM]