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New pump relay box
July 11, 2010 - 8:04 pm

47' Cheoy Lee 1986 Efficient MY
4-MarineAir AC units
1-Aquamarine AC
50 AMP service
Cape May, NJ and Georgetown, MD boating areas.

Steve: We installed the pump relay box you sent successfully (Marine Air 6PRP pump relay box). Now this mechanic originally wired the raw water pump motor incorrectly which we assumed knocked out (fuses kept blowing) the pump relay box. Now we have the new pump relay box installed that you sent us. The water flows through the raw water outlet in the hull successfully. The new motor for the raw water pump is running.

BUT, none of the 5 AC's are delivering cold air. Average temps were in the 80's while at the boats survey the average temps were approx. 52-58 degrees. (one year ago)

One AC unit seems to be cycling off and on every few minutes. The other AC's run but don't deliver any cold air.

So far we have installed a new raw water pump motor (Old motor wouldn't turn off until i thre the circuit breaker, then wouldn't turn on afterwards) and new pump relay box that's wasn't voltage sensitive (Marine Air 6PRP pump relay box).

What would you recommend at this stage?

Thanks all:

Jim Hughes
Cape May, NJ

Steve Pooler
July 12, 2010 - 6:55 am
Member Since: November 12, 2008
Forum Posts: 1127
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Hi Jim~

I'm glad your relay is working, but I think at this time I'd try to get a "Qualified" Marine A/C Tech out to take a look...

With 5 units not working...You with no experience...Me with no pressure readings or even knowing if compressors are running, what they are shutting off on, etc....

We might be here for your whole season back & forth...learning....

A qualified guy could get some baseline of whats happening in a matter of no more than an hour...Then you'll know where you stand.

My best advise ?....I wouldn't try to run these things until you do...You can do costly damage by doing so, and it seems they were operating well during survey...

You can find a dealer in your area thru this link ** you don't have permission to see this link ** by calling Marine Air at 1 800 542 2477.


July 12, 2010 - 10:42 am

Hi Steve:

We have made a contact from the site you recommended, Mid Coast Marine in Brigantine.

If anyone has heard of them please let me know.

Thank you,

Jim Hughes

July 16, 2010 - 4:12 pm


Did what you suggested getting an marine AC tech on board for trouble shooting. Poor water flow and lack of freon were the issues. Tech back flushed the system, cleaning out the water flow paths. Now the discharge out the hull reminds me of a fire hydrant. Laugh
He charged the system with R-2.

Now taking steps to keep the water flowing with bromine and copper wiring. Going to put the copper wire coil into the water pump because theres a nice basket filter verses the thru-hole since they are close together. Will video record the discharge out the hull and take tempertures of all 5 AC units for a history. Any comments would be appreciated.

Thanks again for your valuable input.

Jim Hughes

Steve Pooler
July 24, 2010 - 7:39 am
Member Since: November 12, 2008
Forum Posts: 1127
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Glad you are up & running  Cool

I use copper tubing in the strainer basket (more surface area than wire)

Just go to Home Depot buy a 4' length, and cheap tubing cutter...Cut the tubing to the height of the basket itself and put in 3-4 lengths.

I might also be concerned about where that freon went...These systems should not leak like a car with rubber hoses & compressor shaft seals.

They also don't like running low on freon so monitor them for loss of cooling...If they seem to not cool as well...Shut them off and get it checked again...Running low on freon kills compressors fairly quickly.


July 24, 2010 - 10:49 am

Thanks Steve:

Thought i heard one guy say the lack of water flow through the system causes freon to be used up. Any thoughts?


Steve Pooler
July 24, 2010 - 3:28 pm
Member Since: November 12, 2008
Forum Posts: 1127
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Thoughts about freon ?

No Hocus Pocus, It does not go bad, and No such thing as Freon Monsters that eat it up... Laugh

If it disappears...There is a leak.  Frown

Thats not to say that a system may not have been charged incorrectly previously...As I said...If you notice a drop in performance...Get it checked again...

If it's low again...There is a leak that needs to be located & repaired.


July 24, 2010 - 4:39 pm

Freon was the question and thanks for the input. Seems opinions run wild.

Now Steve, is there a do it your-selfer chamethod to check for leaks. My girlfriend just said take a bottle of water and dishwasher liguid and spray on hoses and fittings and see if there's bubbles.Cool

whatcha think?Wink

Jim Hughes enjoying very cool AC for now!

Steve Pooler
July 26, 2010 - 7:36 am
Member Since: November 12, 2008
Forum Posts: 1127
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Solder joints are what leak Jim...Galvanic action attacks the dissimilar metal, and is evidenced by the solder joints turning black...

If a black joint is oily...It's likely leaking...

I use Fantastic, or 409 to pinpoint a leak before re-soldering...Look for little bitty white bubbles...


July 26, 2010 - 2:34 pm

Thanks Steve:

What is the method of testing with the 409? Do you run AC units first, warming them up then use the 409 test looking for bubbles. Or can you do it with AC units turned off?

Jim Hughes

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