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I will be happy to assist you.
I will need to know what the wires are connected to in unit and model on your new thermostat.
Yes I understood that there is no thermostat .Are you saying there are no wires ran from unit to thermostat location?
Do you have letters on the low voltage terminals like R,W,Y,G,C?
Tell me what letters you have on the low voltage terminal
I run a local HVAC company so not sure if I will be in office or in the field.If you would like to do this by phone, we can exchange phone numbers and work over phone on Monday but the site requires an additional service fee for that.Let me know if interested and I will submit offer.
Not sure if I will be online Monday.I am going to open to other experts in case I am not available.
Please attach a well focused, close up photo of the wiring diagram glued inside the unit service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here. , Include a picture of the thermostat wire connections to the printed circuit board in the same area that will include terminal letters such as R,W,Y,G, C and a few others.
You can also use the 'attach files' link at the left of your send button if there is no paper clip icon.
We can go from there.