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upring
18-04-2010, 01:25 AM
somebody can help me, im so compused what is the right pressure using 404a in a walk-in freezer.. to get atleast negative temp. reading

Peter_1
18-04-2010, 09:49 AM
At a pressure corresponding to a negative temperature if you look on a logp/h chart of R404a :o

nike123
18-04-2010, 10:03 AM
http://www.refrigeration-engineer.com/forums/showthread.php?t=11383&highlight=pressures+meaningless