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Open Roads Forum  >  Tech Issues

 > Bench Testing Dometic Duo Therm AC

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1L243

Roseburg Oregon

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Posted: 04/08/12 01:14am Link  |  Print  |  Notify Moderator

I picked up a used Duo Therm 1100 BTU AC for the Garage in my Toy Hauler. The previous owner replaced it because he just bought the Camper it came on . He needed to get a low profile unit so it would fit in his garage. It's about a 2005/2006 unit. It worked when he took it off. The unit is in pretty good shape a little dirty on the inside but not bad and some dirt is expected.

I am bench teting the unit before I go through the work of installing it. All the fan speeds work fine. Heat strip heats up.

My question is, according to the manual it only cools to 66 degrees. My garage is about 60 degrees. Is there a way to tell if the compressor is working properly? The tubes coming out of the compressor are cold but not frosty.


2011 Work and Play 30WR. Added 2nd AC, four deep cycle batteries.


kneal44

EAST CENTRAL TEXAS

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Posted: 04/08/12 06:40am Link  |  Print  |  Notify Moderator

touch each pipe from compressor... the high side should be hot after running a few minutes. the cold side cool or even frigid.
the high side is usually the smaller diameter copper tubing that goes to condenser coil. the cold tube comes from evaperator coil and larger diameter.

feel top of compresor ... should be a slight viberation to the tough...

if not then maybe too cold in your garage. wait for warmer day.

you can also put a drop cloth or camvas over the unit so it heats up a bit.

while you have access to it clean coils whits soapy water and blow out with compressed air ...

good luck


when u play in the sand .... you can get stuck

9-24-08 corpus christi padre island texas. wrecker had to haul me out!
'92 dp 5.9 cummins 190 hp....8mpg yuck!


jauguston

Bellingham, WA

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Posted: 04/08/12 09:13am Link  |  Print  |  Notify Moderator

You are going to have to get the environment around the test area heated to above the low limit of the unit or the compressor will never come on.

Jim


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1L243

Roseburg Oregon

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Posted: 04/08/12 06:46pm Link  |  Print  |  Notify Moderator

It got up to 70 here today, what a day... Was not expecting it. Garage got up to 66 degrees so what the heck I got the AC running on max and put thermometer under the duct. After about 15 minutes it was reading 59 degrees. I think that is good. After 15 minutes the cold sise was very cold and the hot side was warm.

Thanks for the input..


I think I am going to throw it on the roof...

dougrainer

Carrolton, Texas

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Posted: 04/08/12 06:42am Link  |  Print  |  Notify Moderator

The ONLY way to tell is to use a AC amp meter. Look at the spec plate and it will give you the compressor running amps. You then run the AC for 15 minutes and take an amp reading at the BLUE wire going to the compressor. The amp reading at the spec plate is based on 95 degrees ambient. You subtract 1 amp for each 10 degrees below 95.
So, if your spec plate states 11 amps and it is 60 degrees in your shop, the amp reading you need for a correctly charged unit is 7.5 amps, but 60 degrees is NOT a good test temp. You really need 75 or above for a valid test. Doug

dougrainer

Carrolton, Texas

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Posted: 04/08/12 10:17am Link  |  Print  |  Notify Moderator

jauguston wrote:

You are going to have to get the environment around the test area heated to above the low limit of the unit or the compressor will never come on.

Jim


ALL you do is bypass the tstat as there is NO other cooling control on the AC unit. Doug

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