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Marine Air wont restart after satisfying trmp?

Marine Air wont restart after satisfying trmp?

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32avanti

9:29 pm July 27, 2010
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Post edited 2:31 am – July 28, 2010 by 32avanti

I recently installed a 16000btu marine air unit model# VRE16K-H with the older style digital controller. upon completion of the installation of the used unit we have encoutered the following.

Unit powers on and calls for cooling, fans run,compressor cycles on and unit cools boat very well.Once the cabin comes down in temp and the unit cycles off is where the trouble starts,when the temp rises back up to call for cooling again the fans kick on and the compressor tries to start,gets loud and kicks main breaker on boat. at this point the compessor seems to get hot and after waiting about 25 minutes will run and cool properly again.

If you leave the cabin door open and fool the unit into running it will cool all day but i wont do that for fear of cooking something.

My brother is a residential hvac tech with access to the poper gauges and r-22 but he is hesitant to perform service with out knowing proper pressures.

we have gotten all sorts of backyard advice but he tinks the reversing valve is not releasing properly/quickly enough do to either an over or under charge condition.

he asks me to find out capacity of refrigerant and proper pressures at 70 on the wet bulb and a 80 degree cabin temp .

or are we way off base here,maybe you have seen this condition before…………?

thanks in advance.
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Steve Pooler

posts 1127

10:45 am July 30, 2010
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My first guess would be that this is one of the older reciprocating (piston) compressors and that it is low on refrigerant causing it to overheat….

Next but not as likely…The reversing valve has not shifted fully, causing hot gas to dump back on top of the compressor & evidenced by a hot suction line back into the compressor…Which will also cause overheat & possible liquid slugging on restart as the refrigerant boils off…Liquid cannot be compressed, thus the loud compressor & breaker tripping…..It would also result in poor overall performance of the unit…The fact you say it cools the boat well is why I say less likely…

Tell your brother that these marine R-22 systems should be similar to what he is used to in any residential system…

I need to know water temp that the boat sits in, & cabin temp to give pressure estimates.

The Model sticker should tell you factory charge by ounces…I don't have that info but it's likely around 24 oz.

We are looking for 15 to 18 degree coil TD

Also of note for your brother:

Different than home units…The reversing valve is energized in heat.

The digital control (depending on model) will usually energize the reversing valve coil before the compressor starts to equalize system pressure (he should be able to see this on his gauges on re-start) and then de-energize for cooling.

Hope this helps…I'd like to know the answer…From your description it's not a normal problem.

Steve~
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32avanti

posts 12

9:54 pm June 6, 2011
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Post edited 10:02 pm – June 6, 2011 by 32avanti
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Steve Pooler

posts 1127

10:08 am June 7, 2011
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Post edited 10:11 am – June 7, 2011 by Steve Pooler

This thread ended up taking on a new name and became separate…It can be found here: http://marine-ac.com/forum/tro…..ost/#p1524

 

To save the confusion of two threads about the same issue…Please post in the thread linked…

 

Steve~
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