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Troubleshooting
Cruisair WCAH12 not working

Cruisair WCAH12 not working
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ArkRiverRat

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1:06 pm June 23, 2011
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Hi:

I have the above unit in a 1967 Trojan Sea Voyager.  It worked well until this past spring when it quit heating.  It still cooled well, so I figured I'd run the a/c this summer then fix it this fall.  However, now it will not cool either.  I have installed the r134a retrofit kit and pumped out all the old coolant, however I can't get the system to stay below -10lb of pressure.  It will vaccuum down to @-25 pounds for a few seconds then bleed(?) back up to -10 lbs.  When I try to charge the system with r134, it will only take about one pound.  When I turn the unit on, the compressor kicks on but only runs for a few seconds before shutting off.  Any info would be appreciated.

 

Gary in Arkansas
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Steve Pooler

posts 1127

2:58 pm June 23, 2011
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Hi Gary~

Your Cruisair system will not work with R-134a…Only R-22…

If the system will not hold vacuum it has a leak…From your description a fairly large one…

That WCAH12 system is as old as the boat…44 years…I expect it is leaking in many places & is not really worth repair.

 

Steve~
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ArkRiverRat

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5:06 pm June 25, 2011
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Steve:  Thanx for the response.  I obviously dont know much about a/c, so I do have a couple of questions.  The system will hold 10 lbs of vaccuum — does that still mean there's a large leak?  The system would not take more than 1 lb of refrigerant – could that be because we were using R134?  Would the use of R134 also account for the compressor behavior?
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Steve Pooler

posts 1127

6:56 pm June 25, 2011
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Post edited 7:46 pm – June 25, 2011 by Steve Pooler

10 "Inches" (pounds or psi is measurement of positive pressure) of vacuum is not much…How long will it hold it ?

If you have good hoses you should be able to hold 29 "Inches" overnight….Otherwise you have a leak…Any leak in a electric compressor system will cause motor overheat and failure of that compressor from it.

Thing here is you have contaminated the mineral oil in that compressor with R-134a…They are not at all compatible, and different than a car…Your compressor has an electric motor with motor windings that will likely fail shortly from that contamination.

R-134 & R-22 have very different operating pressures at any given temp…They simply can't be switched…If you wanted a "Green" replacement for R-22 you would use R-417a…It operates in the same pressure ranges as R-22 and is compatible with mineral oil. 

It really is time to think about a new unit/system…A Self Contained Turbo unit might be your best option…They come pre-charged and all you need to connect is Power, Duct, Seawater, and a Drain….No copper tubing to run, evacuate, or charge.

Not to mention that they will out perform that old system in every way…Many times over… 

http://marine-ac.com/2010/11/0…..-115-volt/

http://www.dometic.com/ee67843…..8db6.fodoc

 

Steve~
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