I have acquired an older Northstar 2456 freezedryer which I am in need of some technical assistance. The unit has a new copeland copelamatic compressor for the condensing unit. The condensor chamber only reaches -20, not the recommended -40. I believe this is what is termed a capped tube system and not the expansion valve type. My referigeration guy can only guess at the amount of referigerant to put into this compressor.
There is no sight window to go by and he is concerned about putting in too much. Anyone out there have any experience?
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first i would make sure the fins to the condenser are straight and make sure it is clean free of dirt and grease. then have him discharge the unit and find out what type of refrigerant it takes , that will give him an idea of how much refrigerant is in the machine then he can add more if needed. i have two dryers and i changed out to a different type of refrigerant in both of them i think it is 409 and 519 but, i'm not saying this is the best way for you, maybe you should investigate your refrige tech guys in your area not all of them know what they are up against. they are very complicated machines