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Thread: Low suction pressure
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15-06-2017, 06:01 PM #1
Low suction pressure
Hello! Can anyone tell me why I'm getting a good discharge pressure (185) but the suction pressure pulls down lower and lower as I get my water down to target temp 31 degrees F)? It's an RSW system using 507. Sight glass on liquid line shows full liquid. Pretty sure I have superheat set right (approx. 10 degrees).
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15-06-2017, 06:44 PM #2
Re: Low suction pressure
Because the load is dropping off as the water cools.
Unless you have unloaders or hot gas bypass.
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15-06-2017, 09:57 PM #3
Re: Low suction pressure
31 deg F water, what type of evaporator do you have?
Last edited by RANGER1; 15-06-2017 at 10:00 PM.
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16-06-2017, 01:23 AM #4
Re: Low suction pressure
Nh3lvr, sorry about taking so long to get back to you. At sea now and satellite connection is spotty. It makes perfect sense now that you said it.
Grizzly, the evaporator is a shell and tube design. Stainless shell with titanium tubes. Refrigerant in the tubes. Not sure of the make or size. Designed to chill salt water in fish holds. Submerged in hold
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16-06-2017, 03:10 AM #5
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16-06-2017, 06:03 AM #6
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16-06-2017, 08:06 AM #7
Re: Low suction pressure
Just a thought Samjohn.
Have you considered partially blocked evaporators.
Unless you have a very efficient filtration system. Your sea water circuit will clog up over time.
Reduced water flow through the evap will result in LP overshoot.
Lower suction pressure with the above fault is quite common.
Check your pump circuit strainers also!
GrizzlyDespite the High Cost of Living it still remains Popular!
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01-09-2017, 04:23 PM #8
Re: Low suction pressure
Why are you posting so much with biennial answers or copies of what has already been said!
Maybe you would like to give us all some history of your experience.
Because at the moment I and others are concerned about the trend and content of your posts.
In fact if the quality stays as poor as it is I will have to consider deleting your posts.
GrizzlyLast edited by Grizzly; 01-09-2017 at 04:27 PM.
Despite the High Cost of Living it still remains Popular!