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Thread: Rotalock dillema
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30-05-2010, 04:18 PM #1
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Rotalock dillema
I have one AC with two Rota-lock valves on hermetic compressor that has faulty HP/LP pressurestat.
I need to change that HP/LP pressurestat.
Its capillaries are connected at each rota-lock valves which have two ports. One port is near the stem of valve and other port is more in middle of valve. Capillaries are connected at that other port near middle of valve.
From my memory this port cannot be closed by manipulating valve stem. It is always open to valve body.
What is easiest way to change that HP/LP pressurestat without carrying vacuum pump and recovery cylinders.
I need to do that job on some island and i wish to avoid excessive costs by transporting my van with ferry which is very expensive for me and my customer.
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30-05-2010, 04:24 PM #2
Re: Rotalock dillema
Well if it is not leaking why don't you leave the old one in place and fit a new one to the guage port, which you can access by back seating it and fit a Tee fitting so you will still have the guage access.
Might not be the best asthetic result but it will avoid your costs.
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30-05-2010, 04:28 PM #3
Re: Rotalock dillema
You are correct.
So if you front seat the suction (wind it all the way in) and pump down the comp, then turn off the unit and front seat the discharge valve (again wind all the way in).
You have now isolated the comp from the system and you can change the hp / lp parts with little or no loss.
A quick vac of the comp will ensure it has no air inside (there will be little but a vac is best).
All the best
coolrunnings
.
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30-05-2010, 05:37 PM #4
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30-05-2010, 05:45 PM #5
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Re: Rotalock dillema
Thanks, that was my preferred solution too.
Vacuuming is no option so careful pump down with little overpressure in suction will resolve issue with air. Than same thing on high side will keep air from entering. I will probably use plastic capillaries that will help quicker switching and minimal loss of refrigerant.
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30-05-2010, 06:04 PM #6
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30-05-2010, 06:13 PM #7
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31-05-2010, 05:01 AM #8
Re: Rotalock dillema
sounds like you might as well bite the bullet now nike if the service valve is in bad repair.you could always walk onto the ferry with a wheelbarrow of tools and be picked up the other side
enjoy your get away and dont forget the fishing rodmmm to beer or not to beer...........lets drink breakfast
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01-06-2010, 07:28 AM #9
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Re: Rotalock dillema
Fortunately, ten years ago, when I commissioned that AC, i used 1/4" copper pipe to connect HP/LP pressurestat to rota-lock ports. Solution is so easy and I have it in my tool bag! Just needed some time to mature in my head!
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01-06-2010, 04:28 PM #10
Re: Rotalock dillema
I"ve been known to change the bellows if you can find the same pstat.
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01-06-2010, 06:33 PM #11
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