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Marine-AC Topics
Troubleshooting
The age old, My A/C won't get cold!

The age old, My A/C won't get cold!
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justin3085

6:48 pm July 23, 2010
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Ok, I have a Marine Air Systems unit in a 1985 29' Silverton Sport Cruiser. Its a 9,000 BTU unit and the compressor looks like its right out of the box. Anyway, I have great waterflow and discharge. When I turn the knob to "Run" I hear a click and the condenser (I think that's the term) kicks on. I feel the copper tubes and one feels very cool that leads to the condenser however only hot air gets blown out. After about 3-4 minutes the breaker trips.

I know this is a vague description but when I know exactly what specific info is needed to diagnose I will also send pictures if need be :)

-Justin
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Steve Pooler

posts 1127

7:09 am July 24, 2010
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First Terminology…

  • The compressor is the part that runs (it compresses)
  • The evaporator is the part that the air sucks thru (and gets cold in the cooling mode)
  • The condenser is the part the water runs thru (it should get warm in the cooling mode)

In the heat mode…The condenser & evaporator switch jobs…So if your condenser is getting cold, your unit is running in the heat mode, and i suspect you may have a thermostat problem making the unit run in heat when you want cool.

Get back to me about what is cool & what is warm and we can go from there…

Steve~
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justin3085

6:33 pm August 7, 2010
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Ok, the evaporator feels warm. The fins are clear and I can feel air getting sucked in. One tube that comes into the unit gets cold and the other that leaves the unit feels hot. After 1-2 minutes of operation it will trip the breaker. The condenser feels hot on the top portion and warm towards the bottom.
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Steve Pooler

posts 1127

8:04 am August 8, 2010
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Do you still have great water flow overboard ?…Tripping the breaker is usually an indication that you may not..

Is the compressor cycling on & off ?…That's another indication of not enough water flow thru the unit…

Steve~
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justin3085

10:45 am August 8, 2010
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When I turn the switch to "start" there is great water flow overboard. I have to be honest and didn't even think to look after I turned the switch to "run" when the unit is running. I will check that next time I go to the boat.
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