Hey guys, Is there anywhere to find out (other than the techman) what the normal average suction and discharge pressures are for all types of freon in different applications? I.E. Air cooled/water cooled/chill water systems.
You can shoot norms on your system. There are formulas that you can use to do this. This is the best and most precise way to toubleshoot your systems. You do need to know some basic info on them however. (I.E. EDT=evaporator design temp etc.)Very easy math. If you need the formulas let me know.
Is that you chuck? We went to A/C&R and hydraulics together if Im thinking of the right colburn.
I've got all those formulas already. Just wondering if there are basic generic suct and dichg pressures for different types of refrigerant. Ive got a refer with 404A and a freezer with god knows what in it but its working great. Trying to figure out whats in it by the pressures if thats possible.
Whats up Dave, it seems there is a meeting of several people from our class on here. The problem with the method that you are talking about is that you are going to be putting gauges on an unknown system and if the gauges you put on aren't compatible with that refrigerant then they will be ruined. If it is an air cooled system then you should be able to match your pressure up to a refrigerant by using ambient temp and figuring out your condensing temperature/pressure and see what matches up. Such as R134a at 70 Deg ambient temp should be ____ discharge pressure. It may be a little more complicated then what I am saying but should work. If it works, just leave it alone... I am having a heck of a time with a freezer that hasn't worked in almost five years. But if you MUST know, collect the refrigerant into a recovery bottle and then put gauges on it. Pressure/Temperature relationship will give you what it is. Now all this depends on whether there are air/nons in the system also that would throw all of your readings out of whack. Good luck.
Yea the freezer is the only thing that hasnt gone to sh*t on me on here. Replaced the AFT A/C compressor twice already and the refer sled once. The Navy really tore the crap out of these boats before we took ownership of them.
What type of freezer/reefer do you have? What type/brand name are the compressors? Once you have that information you should be able to contact the manufacture for more details on type of refrigerent/high and low PSI. Agree with the above statement on shooting norms unless you are having significant problems average out your suction and discharge psi based on different load conditions. If your not sure what type of refrigerent you have again agree with the above statement the P/T chart is probably your best method. Good luck
