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Old 08-31-2012
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Water Routing for AC

Hey Folks...Happy Labor Day Weekend!

I have a 33' Cheoy Lee Clipper that has an AC unit installed in the closet. A March pump brings outside water thru a filter then thru the pump and then to the AC unit. Well, the AC quit blowing cold and I worked it down to the pump overheating partly do to a filter that hasn't been cleaned in a while. So, I was wondering if that instead of replacing the filter and pump...could I possible just hook the water intake up to a water hose? Could I just, when turning the AC on, switch the AC on and then just turn on the fresh water supply from the hose? And when turning it off I could just switch the water off first and then shut down the AC unit.

I'm thinking the clean city water will be better for the unit anyway! Yes...it cost more. Would the pressure from the hose be enough to replace the pump that was pulling water from the petcock?

Cheers!
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Old 08-31-2012
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The water is removing heat from the condenser. As long as there is enough heat transfer, you will be fine. If you try to put water that is too cold through the condenser, (too much heat removal) the discharge pressure will be too low, and the differential pressure across the expansion device will be too low to push liquid refrigerant into the evaporator. In that case, you will need to regulate the water flow to maintain a minimum discharge pressure.
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Old 08-31-2012
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Oh, and shut the AC off before the water. Otherwise the compressor may trip on high discharge pressure with no water flow.
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Old 09-01-2012
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Re: Water Routing for AC

There is no reason you can't run city water through your condenser. City water pressure will be more than enough. Dannyboy is correct in that too much water flow is less than ideal. It won't result in a loss of refrigerant flow through the metering device, but it could result in low evaporator pressure, and possible evaporator freeze up. This is no different from running cold ocean water through the heat exchanger, so presumably the manufacturer has some kind of head pressure control to deal with the problem. I wouldn't speculate more without knowing more about the design of the a/c make and model.

Just because you CAN use potable fresh water doesn't mean you should! That would be a colossal waste of water! Would you grab the hose, turn it on full, and just leave it running all day? That is what you would be doing!

You would be better off fixing the seawater system. Don't waste precious fresh water!
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Old 09-01-2012
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Re: Water Routing for AC

Quote:
Originally Posted by SchockT View Post
It won't result in a loss of refrigerant flow through the metering device, but it could result in low evaporator pressure, and possible evaporator freeze up.
Exactly what I meant, it would stuff the condenser and starve the evaporator.


Also, totally agree with not wasting fresh water.
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