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goreds2 · 10-13-2010, 08:43 PM

OK, I am getting ready to look at a Class B on Friday. It is being sold via an estate and the son is doing a very good job at answering all my questions before looking at it. I asked about the Roof top AC. He said he plugged it in and turned it on tonight. He said it blew cold but thought it may be because it is cool outside tonight as it is 60 degrees. I think he is doing his very best to be honest. His father and not him used it through the years.

Would a defective roof top Air Cond. unit blow cold if it is 60 degrees outside? I would not think so. Thanks,

It is a 1990 Dodge Ram van - camper

RV Wizard · 10-14-2010, 02:53 AM

A defective air conditioner is defective and depending on what the problem is only performs as to what is functioning properly. If the fan blows but the compressor does not come on (wait for time delay) it will only move the air through itself and out into the coach. If this is the original air conditioner then it is probably time for a new one.
This may also be true for a refrigerator, furnace and water heater. Good luck and keep us posted.

TXiceman · 10-14-2010, 07:48 PM

If the A/C is operating, you should be able to feel and measure a substantial temperature drop at the air outlet. If it is 60 deg f ambient, you probably can't run very long or you will probably start to freeze up the evaporator. One thing you can do is to run the furnace to check it and get the interior up to 75 degrees and then try the A/C unit. For a short time it should cool the outlet to 18 to 20 deg F lower than the inlet air.

This won't guarantee it is working 100%, but it might be OK.

Ken

goreds2 · 10-14-2010, 08:06 PM

Thanks for everyones input. I will try that tomorrow.

tom2step · 10-17-2010, 10:28 PM

The short answer from a A/C ref guy not an RV guy is yes, It will run for a short while and seem ok if it is low on freon and cool outside but not out of freon. The real test is to run it under a load and for a long time ( over an hour) to give it a chance to freeze up.

TXiceman · 10-18-2010, 07:14 PM

You can always run the propane furnace as well as the A/C to load it...

from a 41 year industrial refrigeration engineer.

Ken

davejo · 03-08-2011, 05:18 AM

First post here, searched my question, found this thread. Is there a temp sensor that prevents the compressor from coming on below a certain temperature?

I bought a little trailer with a late 80s Brisk air unit and am trying to test it out. i don't hear the hum of a compressor but its 40 degrees outside and 50 inside. I guess i'll try to heat up the interior next and see if anything changes.

i have downloaded the manual from Bryants rv but i think it is for newer units. i'm trying to troubleshoot this one before purchasing a new shroud for it. Are these old units worth fixing? The money to buy a new one might exceed the TT purchase price

wa8yxm · 03-08-2011, 08:14 AM

The answer depends on what you call "Cold" how long you ran it and what the defect is.

If you call 60 degrees cold, it's possible

"if the defect is clogged condenser coils (Very common) it's possible

NOTE: clogged condenser coils.. Very easy to fix. (In fact "Routine Mintenance" is what fixes it)

RV Wizard · 03-09-2011, 03:00 AM

Quote:

Originally Posted by davejo

First post here, searched my question, found this thread. Is there a temp sensor that prevents the compressor from coming on below a certain temperature?

I bought a little trailer with a late 80s Brisk air unit and am trying to test it out. i don't hear the hum of a compressor but its 40 degrees outside and 50 inside. I guess i'll try to heat up the interior next and see if anything changes.

i have downloaded the manual from Bryants rv but i think it is for newer units. i'm trying to troubleshoot this one before purchasing a new shroud for it. Are these old units worth fixing? The money to buy a new one might exceed the TT purchase price

I suggest you wait until warmer weather arrives to run the compressor. Most likely it is too cool inside the trailer for the T'stat to call for cooling anyway. Good luck and keep us posted. BTW, congratulations.

mikron · 03-09-2011, 03:37 AM

On our Windsport the A/C won't come on fan or compressor if temp. is below unit saftey setting. Not sure what the low temp. is. Couldn't get to come on with outside temp below 50.

davejo · 03-13-2011, 06:53 PM

Quote:

Originally Posted by RV Wizard

I suggest you wait until warmer weather arrives to run the compressor. Most likely it is too cool inside the trailer for the T'stat to call for cooling anyway. Good luck and keep us posted. BTW, congratulations.

alright it finally warmed up a bit and i can hear the compressor kick on if i turn the tstat to the coldest setting. 60 degrees outside. thanks for the advice. need to find a shroud for the old turkey now