Darrell Woolaver
New Member
Hello, I noticed today that the wiring going from the Honeywell spark/controller unit to the gas control valve. (White Rodgers 36E24-204) is not wired according to the diagram. I replaced the controller with this Honeywell S8670K unit about 10-11 years ago and it has been working fine BUT I noticed today that the common on the gas control valve is connected to 24V-ground and not the designated MV/PV common port on the control unit. Yellow lead goes from 24V ground to the gas valve and then in turn another yellow lead comes off of the gas valve back into the furnace somewhere.
Everything is working ok and has been like this for years so I'm guessing that 24v ground and MV/PV common must be electrically equivalent?
I'm inclined to move yellow wire jumping off of the common directly to the control unit and then connect the common to the MV/PV pin as this is what wiring diagram show it should be. But I'm certain the old control unit which was replaced must have been wired like this which is why the MV/PV common is not used on the replacement Honeywell spark unit? pics attached.
Everything is working ok and has been like this for years so I'm guessing that 24v ground and MV/PV common must be electrically equivalent?
I'm inclined to move yellow wire jumping off of the common directly to the control unit and then connect the common to the MV/PV pin as this is what wiring diagram show it should be. But I'm certain the old control unit which was replaced must have been wired like this which is why the MV/PV common is not used on the replacement Honeywell spark unit? pics attached.