View Full Version : Cryogenics -80

08-06-2013, 08:12 AM
Hi can anyone help i need to find out the refrigerant charge as the unit that a compressor change,the refrigerant says mixture and amount of 0.260 Grams.I have spoken the the uk importer and he has no info on.
Its a single stage unit that only needs one compressor with two circuits (like a cascade system)
Unit detail
Make-zhongke meiling cryogenics
Ps i have removed the refrigerant which has a smell of propane

Could i use R508b ?

install monkey
08-06-2013, 05:27 PM
r290,r600 mix or 5o8b usually -80 kit is 2 stage cascade- 404a for high stage
no nameplate on the cabinet?
last resort check with manufacturers as if it doesnt work its gonna take ages to get to temp

08-06-2013, 08:12 PM
Propane keeps the oil flowing, it'll need a small amount from vacuum, maybe only a gauge line full. Recommended charge and type of refrigerant is vital, don't guess at -80. Sounds chinese so god only knows what was in it originally.