Daikin WCT Series Operating & Maintenance Manual page 80

SYMPTOM
Small Evaporator
water pressure
difference between
water entering and leaving
Fluctuating unsteady
water flow
OIL SIDE
SYMPTOM
No oil pressure when
system start button pushed
Unusually high oil
pressure develops when
oil pump runs
Oil pump vibrates or is
noisy
Reduced Oil Pump
Capacity
Oil Pressure Gradually
Decreases
Oil loss during operation
No oil pressure display
OMM WCT
RESULTS
Capacity Loss and high
Evaporator approach
temperature
Pass baffle gasket damage
RESULTS
Low oil press displayed on
control center and compressor
will not start
High oil pressure is displayed
on control center when the oil
pump is running
Oil pump vibrates or is
extremely noisy with some oil
pressure
Oil pump pumping capacity
Oil level is decreasing in
oil sump
No oil pressure registers on
the control panel when oil
pump runs
Centrifugal Chillers
Possible Cause
Evaporator pass baffle Stop unit operation, drain water, remove
gasket damage
water box and replace gasket
Air in water boxes Vent any air from the chiller water boxes
prior to starting the water pumps
Possible Cause
Oil pump running in Check rotation of oil pump - electrical
connections
wrong direction
Oil pump not running Troubleshoot electrical problem with
oil pump
Oil pressure regulator Adjust oil pressure regulator valve to
valve is not adjusted
maintain proper oil pressure differential
before the start-up
Defective oil pressure Adjust oil pressure regulator valve to
transducer or oil
maintain proper oil pressure differential
pressure regulator
and/or check oil pressure transducer
valve is not adjusted
Oil not reaching pump Check Oil Level
suction inlet in sufficient
quantity
Worn or Failed Pump Repair/Replace Oil Pump
Excessive end Inspect and replace worn parts
clearance pump
Other worn pump parts
Partially blocked oil Check oil inlet for blockage
supply inlet
Oil filter is dirty Change oil filter
Filter-drier in oil return Replace old filter-drier with a new one.
system dirty
Orifice of oil return jet Remove orifice, inspect for dirt, remove dirt
clogged using solvent and replacement
Faulty oil pressure Replace oil pressure transducer
transducer
Inspect oil transducer wiring connections
Faulty
wiring/connectors
to the panel
Remedy
Remedy
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