Post edited 6:30 am – June 28, 2011 by Steve Pooler

What was the high side pressure when you were getting the 115 psi suction ?

Also what was the cabin & water temp at that time & was the unit pumping good solid water over the side of the boat ?

Hard for either of us to diagnose/pinpoint a problem with only part of the picture…

Steve~

supreme-01 said:

The cabin temp was about 80 and the water temp was probably about mid 70's. I didn't check the high side temp but as an assumption im gonna say 325 ish. Given the temp of the liquid line. There was ample enough water dispersing on the side of the boat. Is that a normal suction pressure?…

It would be with head pressure that high…The high pressure switch is set to shut the compressor off at 425 and that's part of what I'm trying to determine here…Is the compressor cycling off ??…We do need to know head pressure to get the full picture…

What is your definition of "Ample Enough" ?…Full solid thru hull with no bubbles, or what might make it look milky ?

If he has good water flow, he may just have a scaled up condenser (water coil) and that scale is acting like an insulating blanket preventing proper transfer of heat to the water (like a dirty radiator in your car)

I would expect normal head pressure in mid 70's seawater and 80 degree cabin to be around 225-235 psi…This will also bring your suction down to around 72-73 psi which will give you around a 42 degree evaporator coil…

Acid flushing the water coil may be your answer, but good clean, clear, flow is imperative even with a clean coil…I would check both before dumping refrigerant to lower the head…Not that you were thinking about it  

Steve~