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Marine-AC Topics
Troubleshooting
MarineAirr Trouble Shooting

MarineAirr Trouble Shooting
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gbenjamin

posts 5

11:20 pm September 21, 2011
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I recently purchased a 79 Chris Craft 380 Corinthian that has three Marine Airr units. I'm not sure their vintage. I fired up the AC the first time this weekend and it ran good and cold for about ten minutes and then tripped the air unit breaker. I started running down the problem and discovered the pump was not pumping. I've put a meter on the line into the pump with the breaker at the main salon on and have proper voltage. The pump looks really corroded as it sits in the bildge. While running the air I noticed several amp spikes on the panel just before the breaker kicks. Will this be caused by a lack of water? The pump is not doing anything at all. I did not see a relay box. Is it the pump? Do you sell a replacement? BTW this did not come up on the survey….
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Steve Pooler

posts 1127

6:44 am September 22, 2011
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Post edited 6:47 am – September 22, 2011 by Steve Pooler

Yes…What you describe are typical symptoms of No Water Flow….

To save me typing it here…Check out these posts I wrote…If you still have specific questions please come back here & ask…

http://marine-ac.com/marine-ac…..mp-relays/

http://marine-ac.com/2009/08/1…..re-switch/

 

Also: To locate your pump relay (if it has not been removed which is possible) just follow the wire from the pump itself to where it connects…There should be your relay box…

 

Steve~
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gbenjamin

posts 5

8:27 am November 2, 2011
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I didn't have a chance to deal with the cold side of the unit as the heat passed and there was no need so I decided to put that projedct off. Now I am getting into the colder months in the San Francisco Bay area and not getting heat from these units.. They have the old style manual controls which don't seem to be working correctly. Where do I start with troubleshooting these systems? Can you reccomend a reliable cost effective replacement for the controls?

Thanks

 

Guy
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Steve Pooler

posts 1127

9:24 am November 2, 2011
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Hi Guy~

Before investing in controls (Not that I wouldn't like selling you some) It might be wise to see if your units will cool & heat…

Did you get your pump issue taken care of ?

The units will not cool or heat without full water flow over the side of the boat…

How do you mean that the controls "don't seem to be working correctly"  ?…

Please explain further…

 

Steve~
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gbenjamin

posts 5

9:57 am November 6, 2011
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Ok, i did not know that I needed the pump for the heat as well. I guess I need to take care of the pump issue first. Is there a book available on trouble shooting and understanding how these systems work? I am fairly handy but don't have a clue of the basics with these systems. Thanks
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Steve Pooler

posts 1127

12:02 pm November 6, 2011
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Book?…Not Really, Other than your owners manual …
And at the risk of sounding biased…this is the best source for Marine A/C info that I know of, and also why I started Marine A/C.com…

If you feel like reading & learning…The pages here have a ton of info & my efforts to teach folks about the subjects contained within.

Steve~
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gbenjamin

posts 5

3:28 pm November 7, 2011
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I checked the fuse on the relay box and it seems ok. The compressors seem to be running with the fans at all three units. The pump breaker is on. The pump looks really corroded and doesn't make a whimper under any circumstance. I'm thinking it is the pump but I guess I should troubleshoot the relay first. Can I bypass the relay in order to see if the pump works?
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Steve Pooler

posts 1127

7:19 am November 8, 2011
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Yes you can bypass the pump relay…Or do a simple voltage check with a meter…

If the pump motor has the proper voltage & won't run…It's either stuck, or the motor winding's have failed…

From your description of the condition of the pump I'd guess that the motor is stuck…Sometimes you can manually spin them (with power off) to get them broken loose but they may not last long after that…

Best to replace…

 

Steve~
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gbenjamin

posts 5

11:06 pm November 9, 2011
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Do you sell or can you reccomend a replacement pump. I'm not really familiar with the use of a meter. Can you give me an elementary idea of what I am testing and the proper procedure.
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Steve Pooler

posts 1127

9:39 am November 10, 2011
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gbenjamin said:

Do you sell or can you reccomend a replacement pump. I'm not really familiar with the use of a meter. Can you give me an elementary idea of what I am testing and the proper procedure.

Yes I sell pumps…I'm thinking your boat with 3 systems used a Cruisair/Marine Air model PMA 1000 pump…It's a black motor with a white wet end (pump head) and has a plastic "Hump" on top of the motor that hides/covers the capacitor.

Pricing is in the links at the top of any page here Pg 10 of the Marine Air price book…$480.00 but I will discount (just can't publicly post discounts)

As far as testing voltage…Just open the relay box & you should see where the pump wires connect…Take a multimeter (set for AC voltage…May be a ~ type indicator on the dial/pointer) and with the system powered up, check for voltage at the black & white pump wires…Should be the same as the system voltage…115-120 volts AC.

 

Steve~
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