Compressor Oil Contamination Part I - Cause and Effects
Compressor Discharge Pressure Problems
Symptom
Compressor Discharge Pressure Too High
Diagnosis
Non-condensables in system (nitrogen, oxygen, etc.)
Solution
Identify cause; usually a leak to atmosphere
Diagnosis
System overcharged with refrigerant
Solution
Remove excess refrigerant
Diagnosis
Dirty condenser/receiver
Solution
Remove end caps and clean tubes
Diagnosis
Defective or improperly set water regulating valve
Solution
Set for proper operation (e.g. R507: 175 - 190 psig)
Diagnosis
Air in condenser/receiver water system
Solution
Vent air from system
Symptom
Compressor Discharge Pressure Too Low
Diagnosis
Low suction pressure
Solution
Lowest suction pressure should be adjusted to 24 - 25 inches Hg
Diagnosis
Shortage of refrigerant
Solution
Add sufficient refrigerant to eliminate bubbles in the sight glass
Diagnosis
Defective or improperly set water regulating valve
Solution
Set for proper operation (e.g. R507: 175 - 190 psig)
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Tech Tips Home
These technical tips are for use by qualified maintenance
personnel who are familiar with their specific freeze drying equipment. These
tips are intended only as general guidelines. Lyophilization equipment is
frequently custom configured and some tips may not be appropriate for all
freeze dryers. Always read and follow the directions of your equipment's
maintenance manual. If you would like to discuss one of our tech tips, please
contact Dave Clayton at 215-672-7800 ext-1376.