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05-01-2011, 04:12 AM #1
404a cool room operating pressures
Hey guys.
Just wondering what kind of suction and head pressures you could expect in a 404a cold room setup.
System originally ran on R22, seized compressor.
Swapped out the compressor, new one is a 404a. (I did not order the new parts)
Charged it by the weight on an info tab on the system, got called back for evaporator icing up.
Got back, giving all signs of short of gas. Then the thought struck me. Don't have a leak, but the new gas charge would be higher than the old one as 404a is higher pressure than 22.
Whilst charging, unit started tripping on HP.
Figured it was because of the old HP sensor not set high enough for new gas.
Which leads to my question: what kind of head pressure would a 2-4'C cool room run at (inside a pizza hut so 22-30 ambient), and what kind of HP setting would you set.
Also, what suction pressure would you look for.
Capillary, fan-forced evaporator.
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