OM 135 PFS 155C - 315C 45
Maintenance Schedules
I. COMPRESSOR
A. Performance Evaluation (log condition and analysis)# O
B. Motor
• Measure winding insulation resistance using a megohmmeter X
• Ampere balance (within 10%) X
• Terminal check (tight connections, porcelain clean) X
• Motor cooling (check DC voltage across GDR coils)# X
C. Lubrication System
• Oil line temperatures (no abnormal temperature drop)# O
• Oil appearance (clear color, quantity, as viewed through
sightglass)#
O
• Oil filter change X
D. Compressor capacity change #
• Compressor loads
• Lower leaving chilled water temp. control X
• Record motor amps X
• Compressor unloads
• Raise leaving chilled water temp. control X
• Record motor amps X
• Reset leaving chilled water control to design
• Observe water temp. And record amps X
E. Internal compressor check X
II. CONTROLS
A. Operating controls
• Check water temp. Setpoints against operating temps. X
• Check panel is clean and dry X
• Verify motor overload control setpoints X
• Verify wiring terminations are tight X
• Check contactor contacts (replace if required) X
• Check MicroTech service test X
B. Protective controls (test operation of)
• Alarm relay (if connected) X
• Pump interlocks X
• Guardistor relays X
• High pressure switches X
III. WATER-COOLED CONDENSER
A. Performance evaluation (include water press. drop)# O
B. Test water quality X
C. Clean condenser tubes X
D. Eddy current test --tube wall thickness X
E. Seasonal protection X
KEY:
O = performed by in-house personnel
X = performed by qualified HVAC service personnel
# = Test to be performed with compressor circuit in operation
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