Troubleshooting
FAULT CAUSE REMEDY
A
Discharge pressure too
high
1. Discharge stop valve not fully
open
Open fully
2. Discharge pressure gauge
defective
Repair or replace
3. Non-condensables in the system Purge with a Automatic Purger
B
Discharge temperature too
high
1. Discharge pressure too high See A
2. Too many cylinders cut out Cut in more cylinders
3. Suction pressure too low See D
4. Excessive superheat of suction
gas
Eliminate excessive superheat
5. For two-stage compressors:
interstage cooling does not operate
properly
Repair
6. Room temperature too high Ventilate engine room better
7. Discharge valve defective Repair or renew
8. Pressure relief valve is leaking Repair or renew
C
Suction pressure too high
1. Capacity control does not
operate
Repair
2. Compressor capacity too small Refer to plant design
3. Suction pressure gauge defective Repair or renew
4. One or more suction valves
defective
Renew suction valve rings
5. One or more discharge valves
defective
Repair or renew
6. Pressure relief valve is leaking Repair or renew
D
Suction pressure too low
1. Suction stop valve not fully open Open fully
2. Suction gas strainer blocked Renew
3. Injection control not adjusted
correctly
Re-adjust control
4. Too little refrigerant in installation Top-up with refrigerant
5. Suction pressure gauge defective Renew
E
Crankcase frosted or wet
*
6
Warning!
Stop compressor and contact installation engineer
1. Liquid refrigerant in crankcase
due to:
1a. Room temperature too low
Provide for crankcase heating or, if
provided, check it for proper operation
1b. Oil return from separator
contains liquid refrigerant
Consult plant manual
1c. Installation operates too wet
Re-adjust installation and provide for
superheat
1d. Liquid separator too small Consult plant manual
F
1. Oil pressure for valve lifting
mechanism too low
See J
6 In case of R744 applications only, crankcase can be frosted or wet, during normal operating conditions.
INSPECTION AND TROUBLE SHOOTING
TROUBLESHOOTING TABLE GRASSO RECIPROCATING COMPRESSORS
0089288gbr_11
38 30.10.2017
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