Forum Discussion

Groover's avatar
Groover
Explorer II
Jul 11, 2014

Start delay on Dometic air conditioner

My coach has two Dometic AC units and a 6,000 watt Onan quiet diesel genset. If both units are enabled when the generator is started they both hit the generator at the same time which overloads it and forces it off line and the cycle repeats every time the generator resets.

Does anyone know how to change the delay in one of the AC units so that the generator has time to recover from the first one before the second one hits it with a starting load?
  • Groover wrote:
    My coach has two Dometic AC units and a 6,000 watt Onan quiet diesel genset. If both units are enabled when the generator is started they both hit the generator at the same time which overloads it and forces it off line and the cycle repeats every time the generator resets.

    Does anyone know how to change the delay in one of the AC units so that the generator has time to recover from the first one before the second one hits it with a starting load?


    This is a PERFECT example of a RV'er that will have Transfer switch problems in the future. He is transferring current with a large load. To the OP, STOP doing this. It will burn out your transfer box and also the points in the box will get pitted. The delay on a Dometic is about 2 minutes 45 seconds. The timer starts when original 12 volt power is supplied. It is rare that 2 or 3 AC units will be on the same time sequence. But, regardless, what you are doing will cause problems in the future. To change the timer, just turn one AC off for 1 minute and then turn back on. That should change the timer for that AC. Doug
  • You should not have any extra load turned on when starting a generator, especially not both AC's. Start the gen set and let it run a few minutes before turning on the first AC and then after a few minutes turn the second AC on. Give it a try.