Troubleshooting
FAULT CAUSE REMEDY
All cylinders inactive while
compressor is operating
2. Incorrect wiring of capacity
control
Refer to the "Product Information”
G
Too high oil consumption
1. Type of oil not according to oil
lubrication oil table (too thin oil)
Change oil type
2. Compressor operates unloaded
too frequently
Refer to design calculations
3. No return from oil separator *
7
Check the operation of float valve in oil
separator
4. Restriction plug at the bottom of
suction chamber in cylinder clogged
Clean plug
5. Worn out oil scraper ring(s) Replace ring(s)
6. Loss of oil due to leakage Repair
7. Leaking shaft seal (max. 1 cc/hr)
Repair shaft seal
Refer to Section 2.2
8. Oil level in crankcase too high Drain/Refill with oil
9. Oil separator is not initially filled
with oil
Refer to section “Initial oil charge”
H
Too high oil pressure
during normal operation at
working temperature
1. Lubricating oil pressure regulator
not adjusted properly or defective
Re-adjust or renew
2. Defective oil pressure and/or
suction pressure gauge (if present)
Repair or replace
J
Too low lubricating oil
pressure
1. Too little oil in crankcase Top up oil
2. Disturbed oil circuit: Oil suction
and/or discharge filter is dirty
Renew the element of oil suction filter
and/or oil discharge filter
3. Lubricating oil pressure regulator
not adjusted properly or defective
Re-adjust or renew
4. Liquid refrigerant in crankcase See E
5. Defective oil pressure and/or
suction pressure gauge (if present)
Repair or renew
6. Worn bearings Renew bearings
K
Too low or no control oil
pressure
(Not or Grasso 5HP)
1. Failure of control oil pressure
regulator in oil pump
Re-adjust or renew regulator
2. A lack of oil in oil system Add oil to the system
3. Oil pump defect Repair or renew oil pump
7 During the initial start-up, the oil separator (if present) consumes oil before the first oil will be returned.
INSPECTION AND TROUBLE SHOOTING
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