11-05-2022, 05:59 AM
I’m going from memory here so there may be error in my old brain.
The AH terminal connections for zone A B &C are seeking a ground and Newell adds an automotive relay since the Dometic call for heat goes +12. The automotive relay coil is connected to the Dometic furnace output and also to the old school stat and the contacts close taking zone A or B or C to ground.
Rudy is spot on, if you have heat on the piping to the coil then the pump is likely running and you should have a signal (+12) to the fan motor. Check voltage at the motor.
At least that is how Whitey at Newell explained it to me. Yours may be different.
The AH terminal connections for zone A B &C are seeking a ground and Newell adds an automotive relay since the Dometic call for heat goes +12. The automotive relay coil is connected to the Dometic furnace output and also to the old school stat and the contacts close taking zone A or B or C to ground.
Rudy is spot on, if you have heat on the piping to the coil then the pump is likely running and you should have a signal (+12) to the fan motor. Check voltage at the motor.
At least that is how Whitey at Newell explained it to me. Yours may be different.
Gordon Jones
1989-42~no slide-#188
2000-45'-2slide-#567
1999-45’-no slide Prevost XLV Marathon