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I installed a Wi-Fi thermostat but didn't keep track of the

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two wires from exterior unit...
I installed a Wi-Fi thermostat but didn't keep track of the two wires from exterior unit one red one white. Not sure where on the schematic they belong can you help the ac won't engage and is heating up.
Submitted: 2 years ago.Category: HVAC
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Answered in 24 minutes by:
5/31/2015
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,022
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified
Welcome!
I need 2 photo's of the thermostat wire connections where they attach inside the furnace, that also shows red and white wire that runs to the outside unit.
We can go from there.
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HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again.
http://screencast.com/t/wmZbZHhlIa5i
Look that over please, we can go from there.
.
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Customer reply replied 2 years ago
The bottom wire is a C wire. The color is green it is attached to the C spot at the thermostat. When I measured all of the parts only are has 24 the top spot that says twin measures 14 and the rest is nothing. I also did try going straight from Y to C and there was no current as well
Customer reply replied 2 years ago
R had 24 twin had 14 everything else had nothing
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again. thanks for data on the C terminal.
It is important to understand that you must measure voltage ***Between** two points with a multi meter for the read to be valid.
I only need to know one thing right now, what read do you get between C and Y with the thermostat set for cooling and down to 55F or at least 5 degrees cooler than the room.
Tell me please which color wires are attached to each terminal on the thermostat please.
We can go from there.
.
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Customer reply replied 2 years ago
Yes 24-26 volts
Customer reply replied 2 years ago
I reversed the polarity at the board from the outside unit and it feels like that may have fixed my problem.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Thanks.
That would be fortunate, but quite unusual, lets dig a little deeper in order to avoid future problem or burning out the the electronics on the printed circuit board or thermostat.
Next tell me you get the same 24-26 volt read where those two wires connect inside the unit outside... if you do and the outside is not running, either the power is off to the outside unit, or the unit has tripped its high pressure cut out switch or other overload, or the contactor coil has failed open.
------------
The other issue, and it is a important issue is that the C terminal has a green wire connected to it, that is supposed to be connected to the G terminal if the themostat is wired standardly... if you got that wrong. you would have created a dead short inside the thermostat between R and C and destroyed the thermostat.
That would have also, blown the fuse in the printed circuit card, and precluded a 24v signal between C and Y that you reported.
I need a photo of the wire connections at the thermostat... that allows me to see the terminal markings for R,W,Y, G, and C
We can go from there.
.
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HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Thanks,
It is wired incorrectly in several aspects
Blue Y from the thermostat should go to Y on the terminal strip... the blue wire at the thermostat obscures which ever marking is there, check that for me please.. do not change anything, that can lead us off into the tall weeds.
I cannot see the terminal letter on the thermostat behind the green wire, can you tell me what that is?
There is no wire on the thermostat from G to G on the terminal strip in the furnace. Hopefully there is a spare wire you can use, if not you need to pull one.
We can go from there. Take your time and be a specific with your wording as possible.
Thanks.
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Customer reply replied 2 years ago
white is w green is C Blue is Y and red is r. I do not have any extra wires in that line. On the motherboard there is a jumper wire between y and g
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Thanks, ***** ***** non standard but is should work.
If you have 24v between C and Y at the printed circuit board, next step to see if you have 24v between those two wires at the outside unit.
I need a well focused photo of the wiring diagram at the outside unit showing all of the controls and contactor etc.. I can mark that up for you with coaching instructions.
.
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Phil
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