almost there....

[billyg]

Please refer to 'changing thermostat' 2/07/04....I went to the roof and looked at the terminal up there. The only difference is the W1 (on the thermostat) is wired to W2 on the roof. Since the Hunter replacement only has a W2, I wired the white to it. Of the three unused wires in the wall, they are unused on the roof terminals as well. I wired the blue to the c terminal so I can wire it to the C (common) on the thermostat. All the other wires R, G, O and Y I wired accordingly.
The new thermostat says it has power (from the Common, as it should).
Now I have a new problem.....the fan runs continuously!?! I checked the programing, set to my specs, but even with the switch in the off position...the fan runs. The thermostat says the fan is off, but it runs. Any tips from anyone?????

[Rewired]

quote:Originally posted by billyg

Please refer to 'changing thermostat' 2/07/04....I went to the roof and looked at the terminal up there. The only difference is the W1 (on the thermostat) is wired to W2 on the roof. Since the Hunter replacement only has a W2, I wired the white to it. Of the three unused wires in the wall, they are unused on the roof terminals as well. I wired the blue to the c terminal so I can wire it to the C (common) on the thermostat. All the other wires R, G, O and Y I wired accordingly.
The new thermostat says it has power (from the Common, as it should).
Now I have a new problem.....the fan runs continuously!?! I checked the programing, set to my specs, but even with the switch in the off position...the fan runs. The thermostat says the fan is off, but it runs. Any tips from anyone?????

Hey!
First question, do you have or can borrow a multimeter of some kind? You may need it soon!
Also, just for kicks, (this may kind of point you in the right direction), if you take the GREEN wire off the thermostat, and power the system up, does the fan still run? Please keep me posted!

A.D

[billyg]

Thanks A.D.... I do have a Fluke 77 and another Fluke ampmeter.I took the new Hunter off and put the old Day and Night mercury thermostat back on and the system works as it did before. I'm not sure if i mentioned that the original thermostat works fine, I just wanted to change it to a digital for better accuracy. I will have to change it all out again to see if the fan runs with the green disconnected. The green is connected to the old therm and works when automatic or by switch. It just didn't work with the Hunter thermostat. I am curious though, by what you mean by mentioning that I may need the multimeter soon. Is there something that I may be doing wrong that i need to know about??? The system, on the roof as many are here in Vegas, is a Day and Night...1986. Also , one more thing. The previously unattached blue wire that I connected to the c terminal on the roof (in order to have a common for the Hunter) is still connected on the roof, but carefully tucked away behind the thermostat in the wall devoid of any contact with anything. Any other hints? Could it be Hunter products?......thanx Billy g

[Rewired]

quote:Originally posted by billyg

Thanks A.D.... I do have a Fluke 77 and another Fluke ampmeter.I took the new Hunter off and put the old Day and Night mercury thermostat back on and the system works as it did before. I'm not sure if i mentioned that the original thermostat works fine, I just wanted to change it to a digital for better accuracy. I will have to change it all out again to see if the fan runs with the green disconnected. The green is connected to the old therm and works when automatic or by switch. It just didn't work with the Hunter thermostat. I am curious though, by what you mean by mentioning that I may need the multimeter soon. Is there something that I may be doing wrong that i need to know about??? The system, on the roof as many are here in Vegas, is a Day and Night...1986. Also , one more thing. The previously unattached blue wire that I connected to the c terminal on the roof (in order to have a common for the Hunter) is still connected on the roof, but carefully tucked away behind the thermostat in the wall devoid of any contact with anything. Any other hints? Could it be Hunter products?......thanx Billy g

Hey Billy!
Ya I was just curious as to if the fan ran steady with the green "Fan" wire disconnected from the thermostat, if it does, that says to me the problem is elsewhere, if it doesn't, tells me the problem is probably with the thermostat, but NOT always.. I stumbled on something with my thermostat some time ago. Its pretty bizarre but I will run it by you. I found out that when the thermostat fan switch is set to "ON" the "G" terminal / green wire is obviously going to be +24V to tell the fan control to turn the fan on. no problem... BUT when the fan switch is set to "AUTO", the thermostat internally joined the "G" terminal with "Y"!
It does this I guess to automatically start the fan "G" when the thermostat calls to have the compressor start "Y" (in your case for both heating and cooling.. What I was going to ask you to do is: connect your Fluke 77 to the now blue "Common" wire and check and see what voltages you get between common and all the other terminals or of your ORIGINAL thermostat (heating / cooling set to OFF, fan set to "AUTO" or "OFF" whatever the case is).. You should only see +24V between blue "C" and red "R" , and zero volts between everything else.. Please try this without either thermostat connected, just going between blue and the other wires AND with the new Hunter thermostat connected as well and see what you get for voltages, They SHOULD be the same as for your original thermostat. Oh ya, pay particular attention to what you get between yellow "Y" and blue "C".. IF your Hunter thermostat is like mine where "Y" is joined to "G" when the fan switch is in "Auto", any miswire or problem elsewhere causing +24 volts to appear on the yellow wire, it WILL feed back through the thermostat, to the green wire and end up picking up the fan relay and keeping your fan running all the time!
Please keep me posted, I would like to know what you find for readings, and then we can figure out whats going on from there! Who knows, it could really just be a dud thermostat!

-Adam-