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Have a 36G22-209 Gas Valve we just installed on a Trane

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furnace. Model # TDX080C942D3. Everything...
Have a 36G22-209 Gas Valve we just installed on a Trane furnace. Model # TDX080C942D3. Everything is acting intermittently. From the installation instructions I believe we should be getting 24V to each of the 2 wires of the gas valve. Both 24V in. Am I reading this wrong?? We’re sometimes getting 24V to one wire. Sometimes not. Ever seen anything like this before we swap out the board?
Submitted: 7 months ago.Category: HVAC
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Answered in 1 minute by:
12/26/2017
HVAC Technician: airheatman, HVAC Technician replied 7 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,362
Experience: Furnace, A/C and heat pump specialist.
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If the 24v is erratic, most likely a failing board.Everytime inducer comes on and igniter lights the board should send 24v to valve.

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Customer reply replied 7 months ago
I agree. But it should send 24v to each wire correct? The way I’m looking at this diagram each leg is normally open until the board sends each wire 24v.
HVAC Technician: airheatman, HVAC Technician replied 7 months ago

No the 24v should be between the two wires.not each wire to ground

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HVAC Technician: airheatman, HVAC Technician replied 7 months ago

One of those wires is 24v common.On call for heat the board sends 24v hot to the valve solenoid to complete the 24v circuit and energize valve

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Customer reply replied 7 months ago
But why does the wiring diagram make it seem different? Lol
Customer reply replied 7 months ago
technically it shouldn’t matter where those 2 wires go correct? There is no C on our gas valve.
HVAC Technician: airheatman, HVAC Technician replied 7 months ago

In reality that IS correct. one is common and the other is hot. The board is basically a light switch just breaking the red leg of the circuit.On call for heat after igniter lights board closes the 24v circuit and we get gas valve open

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