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The newer 5 ton ac units will start and run off an 803a. If you can find one of those they are easier to deal with.

I have found a lot of the r22 units come on fine but then fault because the condenser fan does not kick on. I usually jump the relay trigger off the compressor trigger so the condenser fan is on when the compressor is on.

You can run it and run the ac without a ground rod I do it all the time. If you are running something off the generator just run a ground wire to a fence or pipe that goes into the ground. Dosnt need to be a thick wire.

Make sure panel breakers are on

The contactor is controlled by a panel switch left bottom. It's only for the front panel 3-phase output. The AC unit has power regardless. You can start by using the AC unit in heat mode for a load on the generator.

Needs 10 gal sometimes 5 isnt enough especially if you are not quite level.

Could be a bad water pump. Had that in a few. Dry rotted lines. Or fuel filter o rings not seated right. Did you completely drain the fuel tank? And put 10 gallons of fresh fuel in? Every one I have had, had some water in the fuel.

I have the manual for that unit also

Takes a pair of any batts with post top. Dosnt take much to start them. There is an onboard trickle charger with regular plug under the control panel. Completely drain the fuel tank and replace the fuel and oil filters. Napa 3316 is the fuel filter. Most of these have water in the fuel tank I...