O.T. roof top ac unit

red bearing · Sep 19, 2014

I have a few questions on a roof top ac unit..I"m looking at a used one (price is right)The people said it cools well when its plugged into a 110 outlet in a building..but when plugged into a generator it does not cool as well..any truth to that??Last question it does not have the ceiling kit but I have one from a older model and different brand are they interchangeable??..thanks in advance

red bearing · Sep 19, 2014

It's for an RV 13500 btu..

johndeere720GA · Sep 19, 2014

assemble it on the ground before cutting any holes. Make sure the parts will mate up and function. Plug it in and take it through all switch settings. Also check minimum and maximum ceiling/roof thickness is within the range of the ceiling/roof where you plan to mount it.

red bearing · Sep 19, 2014

Sir do you think there is any truth to the generator and outlet scenario? (in my thread)thanks for your time..

notjustair · Sep 19, 2014

I would say not likely on the ceiling kit. They have an electrical plug to connect the switches to the blower motor and compressor. Those are not standardized as far as I know. You also need it to bolt through to hold the thing on the roof.

Power is power as long as the generator is working properly. It could be that their generator is messed up and causing the compressor to cycle. I wouldn't buy it because of that. I ran two units on a generator for years. That's not the issue. The issue is that their jacked up generator may have shortened the life of expensive parts. Besides the fact that you would have hours of creative wiring to do to make it work (not to mention bolt down).

ss55 · Sep 19, 2014

How many amps does that unit need? 16 amps x 120VAC = 1920 watts. At 80% utilization you would want 2400 watts reserved just for running that AC unit. Any other electricity uses would need additional generator capacity.

What size generator was the previous owner using?

da.bees · Sep 19, 2014

There is no truth in the genny vs plug issue,Unleesss the genny is underpowed or malfunctioning. There are two sets of amp/watt ratings on the data tag. The larger of them,is genny reserve power required to start and bring unit up to operational mode( aka starting amps)

HenryO · Sep 20, 2014

There should be no difference if the Generator is big enuff. All RV rooftops are designed to run on the generator in the RV. Remember this is just a 1 ton unit designed to cool less that 500 square feet..

johndeere720GA · Sep 20, 2014

I would agree with previous comments that as long as the generator has sufficient capacity there should be no difference in cooling no matter how it is powered. If the generator is too small, then, yes cooling will suffer and there will be additional strain on the A/C unit as well. So if they ran it on an underpowered generator hopefully it was not long enough to cause damage to the unit.

JDemaris · Sep 20, 2014

Is the AC unit starting properly when plugged into the generator? A 13,500 BTU AC unit can easily draw 35 amps when starting. A properly wired 120 volt outlet (on a 20 amp breaker) in a house can provide 40 amps for a second or two (for motor starting). A typical portable generator rated @ 2500 amps can barely provide half that amperage and is too small for a AC unit that big. That unless you install a soft-start cap-kit. Two big variables here. The actual generator surge-rating, and if the AC unit has a good cap-kit in it.

O.T. roof top ac unit

red bearing

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notjustair

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HenryO

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