Heating & Air Conditioning Electrical Wiring

Wiring wrong, but it works?

5 years ago

After a lot of investigation, I'm eliminating my Electronic Air Cleaner from my HVAC system and just inserting a 5" media filter. In the process, I notice that the wiring from my thermostat is not connected to the corresponding terminals on the HVAC block connection (see diagram below). Yet, the system seems to work ok. From the thermostat green goes to "Y" and yellow goes thru the EAC and on to the AC compressor. How is this possible that it works, and what changes, if any, should I make?

Also, I currently have just turned off the EAC from running with the new filter. Should/could I just remove it from the circuit and connect the 2 white wires going through it?

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Comments (3)

klem1
5 years ago
Old Chinese Proverb say "Ifin it tant broke don't fix it." New houzz philosophy say

"if it isn't broke jack with it until it is".
mike_home
5 years ago
I don't completely follow your description and diagram. What is important are the labels (Y, G, etc.) and not the color of the wires.

Is GWRY in the upper left the thermostat?

Is YGWRC in the blue box the furnace connections?

Where are the W and R in the upper right originating from? Is R really connected to C?

Does the electronic filter currenlty work in both heating and cooling mode?

When you say turning off the EAC is it still powered?
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wysocki
Original Author
5 years ago
Yes, GWRY terminals in the thermostat are correctly connected to the green-white-red-yellow wires. And at the HVAC, the white and red are correctly connected to the W & R terminals. But the green wire is connected to the Y terminal and the yellow wire isn't connected to the HVAC but is spliced to the white wire of a white/red twisted pair that go thru the EAC and on to the AC compressor outside. (The red of that twisted pair comes from the C terminal in the HVAC unit.) Nothing is connected to G in the HVAC unit.

Not sure about when the EAC worked. I have pulled the AC power plug but the power switch indicator still lights up when the switch is "on" so I have it toggled off now.