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refrigerant boiling out of solution from the lube oil liquid refrigerant flooding the compressor and system lube oil viscosity being reduced by refrigerant dilution compressor suction pressure suddenly increasing
increased capacity of the compressor more efficient operation of the thermal expansion valve decreased capacity of the compressor loss of receiver capacity
compressor damage from improper lubrication refrigerant absorption by the lubricant increased viscosity in the lubricant carbon deposit on the compressor suction valves
continuous running of the compressor high suction pressure high discharge pressure short cycling of the compressor on the water failure switch
in the chill box before the receiver on the suction side of the compressor on the discharge side of the compressor
fan compressor condenser evaporator
always be wide open when the compressor restarts continue to operate as if the system were in operation remain open until evaporator pressure equalizes, then close until the compressorrestarts always be completely closed until the compressor restarts
compressor condenser receiver evaporator
raised risen reduced maintained constant
insufficient condenser cooling water excessive condenser cooling water air in the refrigeration system excessive refrigerant in the system
too much superheat insufficient superheat suction pressure too low excessive refrigerant returning to the compressor
protect the compressor from liquid flood back protect the compressor from low discharge pressure start and stop the compressor upon system demand start the compressor after a drop in the evaporator pressure
overheated compressor bearings excess lube oil viscosity carbon deposits on the compressor piston rings wax crystals forming in the lubricant
refrigerant overcharge overfeeding by the expansion valve a restricted suction strainer due to short cycling of the compressor
a shortage of refrigerant the compressor running continuously liquid refrigerant returning to the compressor the compressor short cycling on the high pressure cutout
air compressor refrigeration compressor vacuum pump purifier
insufficient lube oil circulating through the system excessive circulation of lube oil through the system insufficient refrigerant in the system an overworked compressor
run continuously not start have high discharge pressure short cycle on the high pressure switch
overfeeding of the expansion valve damage to the condenser constant running of the compressor flooding of the receiver
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