Thank you for wonderful suggestions. I should have been more specific in my first post. I know from following that questions here get serious analysis.
I have cleaned the strainers twice, acid washed the water lines of the unit (yes, a lot of crud in the system) and had my A/C guy put the gauges on twice. The acid wash did bring pressures down a bit and did make the unit more efficient. However the the unit is not consistent. It will shut off as soon as I turn on cool and the next time it will run for hours before the HI/PS starts flashing. We left the gauges on for enough time to have a beer and thing ran perfectly, and later that evening it shut down as soon as I turned it on. On the third try, it stayed on for several hours.
My A/C guy and I cannot think of what else the issue could be other than a defective shut off switch. I am wide open to any further suggestions.
Any idea where I might get a HI/PS shut off switch?
Jim
Olde Hatt
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06-26-2021 08:58 AM #11Senior Member
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Re: A/C cruisair high pressure shut off switch
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06-26-2021 09:26 AM #13Senior Member
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- Feb 2017
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Re: A/C cruisair high pressure shut off switch
My wife is the manager of two Inns that are part of a large group that owns several Inns. The A/C company that takes care of those Inns is now working with me on renovating a house. Their maintenance foreman has been helping me with this. The long running of the unit with gauges was an after hours call that he made to see if we could figure out the issue.
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Re: A/C cruisair high pressure shut off switch
If you are positive that it is the switch and you have observed water flowing when the unit errors out, then bypass the switch. It is a normal closed switch.
This will further prove a switch or controller board issue if the error comes back.
Take a picture of the switch and copy the numbers down then post them.
I have a box of these switches that have been removed from condemned stations, not a clue what switch is high or low pressure switches. I'll match your number up to what I have. If I have it, it's yours.
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06-26-2021 11:46 AM #15Senior Member
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Re: A/C cruisair high pressure shut off switch
Thank you, will be able to get that done this week I think.
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Re: A/C cruisair high pressure shut off switch
Just had to flush my whole system again (I flush it 2 times minimum a year). Replaced RW Motor & Pump w/ new thinking I dry ran it. After kicking my ass for 2 days doing all this to Cool the the wife off, units still shut off due to HP (insert multiple explicit words!). Had little H2o before & after all the work. Diver found a large oyster shell as I suspected something still restricting flow from through hull to strainer while I was enroute to airport. Told wifey to turn on AC and wahla! Still shut off due to HP! A buddy is suppose to go check it out as I suspect still more shell in the line but the jury's still out as wifey seems content waiting for me to get home in another week & half! Well at least I have that spare RW pump I always wanted as sure old one pulled is still working. Not a big fan of the magnetic drive/ non self priming pumps but they're half the price as the Dometic/oberdorfs. Yeah you can say the price of the 2 cost as much as the Dometic/Oberdorf but, I already went down that road. South Carolina sure does get hot this time of year!!!
James
53' MY "No Regrets"
I.O.P, S.C.
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Re: A/C cruisair high pressure shut off switch
The March magnetic drive pumps are excellent and do not suffer from impeller erosion like the dometic oberdorfer which are non self priming anyway
I once had a march impeller fail, replacing the impeller was a 10 minute job as I didn’t have to even pull the hoses. Just pull the cover. And they can never leak.
Depending on how you flush sometimes shells get displaced around. Then when you start the pump they jam again usually in the manifold. Sometimes you have to take the manifold and hoses apart to do a complete jobPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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07-25-2021 12:14 PM #18Senior Member
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- 1,188
Re: A/C cruisair high pressure shut off switch
Not sure that it makes any difference but I try to flush in reverse flow of what the unit is seeing. I've had some chunky stuff come out before that def would not have made it through the normal flow direction.
Weirdest thing that ever came out was a 1'+ section of small thin poly tubing. No clue how it got past the strainer, pump and into the unit, but somehow it did (or maybe it was inside a hose when installed).SOUTHPAWS
1986 52C Hull #391 8v92TI
PENSACOLA, FL