GEA Bock HG66e Series - 9 Maintenance; Preparation; Work to be Carried out; Spare Parts Recommendation

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8 | Commissioning
8.7 Avoidingslugging
Topreventslugging:
The complete refrigeration system must be properly designed.
All components must be compatibly rated with each other with regard to output
(particularly the evaporator and expansion valves).
Suction gas superheat at the compressor input shouldbemin.7-10K. (check the setting
of the expansion valve). For HC and LG compressors see chapter 5.3.
 Thesystemmustreachastateofequilibrium.
Particularly in critical systems (e.g. several evaporator points), measures are recommended such
asreplacementofliquidtraps,solenoidvalveintheliquidline,etc.
Thereshouldbenomovementofcoolantwhatsoeverwhilethecompressorisatastandstill.
ATTENTION Sluggingcandamagethecompressorandcauserefrigerantto
leak.
9.1 Preparation
9 | Maintenance
9.2 Worktobecarriedout
In order to guarantee optimum operational reliability and service life of the compressor, we
recommendcarrying out servicing and inspection work at regular intervals:
Oilchange:
- not mandatory for factory-produced series systems.
 - foreldinstallationsorwhenoperatingneartheapplicationlimit:forthersttimeafter100
to 200 operating hours, then approx. every 3 years or 10,000 - 12,000 operating hours.
Dispose of used oil according to the regulations; observe national regulations.
Annual checks: Oil level, leak tightness, running noises, pressures, temperatures, function of
auxiliary devices such as oil sump heater, pressure switch.
WARNING Beforestartinganyworkonthecompressor:
Switchoff the compressorandsecure it topreventa restart.
Relievecompressorofsystempressure.
Preventairfrominltratingthesystem!
Aftermaintenancehasbeenperformed:
Connectsafetyswitch.
Evacuatecompressor.
Releaseswitchlock.
Available spare parts and accessories can be found on our compressor selection tool under
vap.bock.de.
OnlyusegenuineBockspareparts!
9.3 Sparepartsrecommendation/accessories