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Thread: freezer low suction pressure
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29-04-2014, 07:01 PM #1
freezer low suction pressure
Hi I have a copeland scroll condensing unit running a freezer coldroom, the unit gets down to -21c in no time and sight glass full with the occasional bubble . The only worry I have is the suction pressure is about 4-6psi which to me is too low. Liquid pressure is 200psi it has a new drier exp valve and orifice. So no blockages. Any info would be great
Alex
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29-04-2014, 07:07 PM #2
Re: freezer low suction pressure
Without knowing the refrigerant and suction pipe temperature we won't be able to comment
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29-04-2014, 07:42 PM #3
Re: freezer low suction pressure
Sorry frank its on 404a I haven't taken a suction pipe temp
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29-04-2014, 08:12 PM #4
Re: freezer low suction pressure
I've been working on a CO2 tank cooler today on 404a with a suction pressure of 5psig and a discharge pressure of 200 psig when I got there
Got the discharge pressure down to 105psig by deep cleaning the condenser then found that it was quite short of gas as the pipe temp was +7C.....didn't help that there was hardly any lagging on the pipe ...oh ...and discovered that it had an R22 TEV
Can you post a full set of system readings?
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29-04-2014, 08:24 PM #5
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29-04-2014, 09:16 PM #6
Re: freezer low suction pressure
Condensing unit about6 month old was on r22
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29-04-2014, 10:32 PM #7
Re: freezer low suction pressure
Check the txv,put a 404a valve on if it has not got one already and check bulb contact on outlet.
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30-04-2014, 07:42 AM #8
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30-04-2014, 03:53 PM #9
Re: freezer low suction pressure
The valve is 404a and I checked the bulb which was sat on top of tue pipe so I moved it to the side which helped a little. Im gonna change the valve tomorrow and see if that helps. Cheers frank
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30-04-2014, 06:26 PM #10
Re: freezer low suction pressure
Has it got the correct orifice in it? It would needed a bigger one than it had on R22.
Mostly found in Oxfordshire, UK :)