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Old 05-22-2018, 05:42 PM   #1
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Austin , Texas
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How to know what wattage the Coleman Mach AC in my FIRST Airstream is drawing?

I am the proud new owner of a 1965 Safari! My first Airstream!

The owner of the home I live in (and park it next to) wanted me to get an electrician out to make sure the home wiring could handle the load.
I'm in Texas and the AC will be working a LOT this summer since my son will be using it as a personal space sometimes here at the house.

The closest outlet is a 20 Amp. I need to figure out how much power the AC pulls. Does anyone know about Coleman Mach rooftop AC? Part # 6759D715 and serial # 079830674 . I looked online and got overwhelmed trying to make sense of what came up since my model number wasn't coming up. The electrician didn't pull the AC open to look and could not tell from the exterior.

Can anyone point me towards a way of figuring out how many watts this one will need?
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Old 05-22-2018, 05:52 PM   #2
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1974 27' Overlander
Baltimore , Maryland
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That part number looks like the ceiling assembly part number. Did you get it off the ceiling assembly or the roof top unit?

You'll need to take the shroud off to find the model number of the roof top unit. It's not possible to tell which one you have from the picture because several different sizes have the same shroud.
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Old 05-22-2018, 06:01 PM   #3
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2000 25' Safari
Davidson County , NC Highlands County, FL
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You can start and run the AC unit on a 20 amp circuit, but over time it will damage the air conditioner because of low power supply. It will also overheat the adapter and the receptacle, and those will be damaged too.

The specs for AC units say if the length of the wire is 25' or less it can be 12 gauge. Longer runs are required to be larger gauge wire, meeting the NEC. The 20 amp circuit in your house is 12 gauge, if it is on a 20 amp breaker. If it is on a 15 amp breaker is only on 14 gauge wire. You are adding more wire length with the power cord, exceeding the AC unit's specs. (heating up wire, burning receptacle, burning cord ends, damaging the air conditioner, maybe damaging the house wiring)

The issue is: the AC unit itself requires a little more than 20 amps, for milliseconds, just to start the unit, a little less amps when running. When you use any other outlet inside the trailer the total load exceeds 20 amps at times, (tripping breaker often).

Even if you do not connect anything else to receptacles, the converter will cycle on and off at times when the AC unit is starting, exceeding the 20 amp capacity. (tripping breakers, and damaging things)

To do what you are wanting, you need a 30 amp 120 volt dedicated circuit, with an outlet to match the cord on your trailer.
2014 Silverado LTZ 1500 Crew Cab 5.3L maximum trailering package
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