GEA Grasso VHS Series Installation And Maintenance Instructions Manual page 40

INSPECTION AND TROUBLE SHOOTING
Troubleshooting
FAULT
G
Too high oil consumption
H
Too high oil pressure
during normal operation at
working temperature
J
Too low lubricating oil
pressure
K
Too low or no control oil
pressure
(Not or Grasso 5HP)
7
40
CAUSE
1. Type of oil not according to oil
lubrication oil table (too thin oil)
2. Compressor operates unloaded
too frequently
3. No return from oil separator *
4. Restriction plug at the bottom of
suction chamber in cylinder clogged
5. Worn out oil scraper ring(s)
6. Loss of oil due to leakage
7. Leaking shaft seal (max. 1 cc/hr)
8. Oil level in crankcase too high
9. Oil separator is not initially filled
with oil
1. Lubricating oil pressure regulator
not adjusted properly or defective
2. Defective oil pressure and/or
suction pressure gauge (if present)
1. Too little oil in crankcase
2. Disturbed oil circuit: Oil suction
and/or discharge filter is dirty
3. Lubricating oil pressure regulator
not adjusted properly or defective
4. Liquid refrigerant in crankcase
5. Defective oil pressure and/or
suction pressure gauge (if present)
6. Worn bearings
1. Failure of control oil pressure
regulator in oil pump
2. A lack of oil in oil system
3. Oil pump defect
During the initial start-up, the oil separator (if present) consumes oil before the first oil will be returned.
REMEDY
Change oil type
Refer to design calculations
Check the operation of float valve in oil
7
separator
Clean plug
Replace ring(s)
Repair
Repair shaft seal
Refer to Section 2.2
Drain/Refill with oil
Refer to section "Initial oil charge"
Re-adjust or renew
Repair or replace
Top up oil
Renew the element of oil suction filter
and/or oil discharge filter
Re-adjust or renew
See E
Repair or renew
Renew bearings
Re-adjust or renew regulator
Add oil to the system
Repair or renew oil pump
P-NL-094_imm_VHS_English_13
26.07.2021