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Thread: Evaporating Pressure
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31-07-2006, 11:15 AM #1
Evaporating Pressure
What should the "ideal" evaporating pressure be on a R410 split air conditioning system, in cooling mode in a 30C ambient
Should it be around 150psi ( which is evap temp +10C ) or should it be less.
On a pre charged system how is the charge adjusted??
Same question for R22
Thx in advance
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31-07-2006, 08:58 PM #2
Re: Evaporating Pressure
Originally Posted by Abe
Never refer to pressures. Look at temperatures using the Saturation tables for the gas you are using. With Air Conditioning you should aim to keep your evaporating temperatures above freezing to avoid frosting on the evaporator. With R22 the saturation temperature at 0C is 49.7psig so most "eng'rs" look for a suction pressure of 50/55psig which ensures that the evap stays free of frost. Likewise you need to look at the sat temp of R410a (sorry, I don't have it to hand) for 0 - 5 C saturation pressure.
from experience it is about 7.5bar
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31-07-2006, 09:03 PM #3
Re: Evaporating Pressure
Thx Frank
Actually this morning when I posted , I did really mean evap temp, not pressure.........Grrrrrrrrrrrrrrrr But what the heck
Ive printed it out
Appreciate your help
Picked up an order for 6 systems today, ranging from a couple of wall splits, to cassettes and one floor mounted
and.............also got a cold room!!!!!Last edited by Abe; 31-07-2006 at 09:06 PM.
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