Troubleshooting Industrial Refrigeration (Continued)
REMEDY OR COMMENT
Compressor loses excessive amount of oil
Oil separator is too small
Broken valves cause excessive heat in
compressor and vaporization of oil.
"Slugging" of compressor with liquid
"Dry up" suction gas to compressor by
refrigerant that causes excessive foam in the
Refrigerant feed controls are overfeeding.
Check suction trap level controls.
Install a refrigerant liquid transfer system to
return liquid to high side.
Noisy compressor operation
Loose flywheel or coupling
Coupling not properly aligned
Check and align if required.
Align and tighten per specs.
Check sheave grooves.
Poor foundation or mounting
Tighten mounting bolts, grout base, or install
Check compressor with stethoscope if noise
Open, inspect, and repair as necessary.
Check for liquid or oil slugging
Eliminate liquid from suction mains.
Check crankcase oil level.
Low evaporator capacity
Inadequate refrigerant feed to evaporators
Clean strainers and driers.
Check expansion valve superheat setting.
Check for excessive pressure drop due to
change in elevation, too small of lines
(suction and liquid lines). A heat exchanger
may correct this.
Check expansion valve size.
Expansion valve bulb in a trap
Oil in evaporator
Change piping or bulb location to correct.
Warm the evaporator, drain oil, and install an
oil trap to collect oil.
Evaporator surface fouled
Air or product velocity is too low
Increase to rated velocity.
Coil not properly defrosting.
Check defrost time.
Check method of defrost.
Brine flow through evaporator may be
Chiller may be fouled or plugged.
Check recirculating pumps.
Check process piping for restriction.
Discharge pressure too high
Air in condenser
Condenser tubes fouled
Water flow is inadequate
Check water supply and pump.