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16 | AQ453249013813en-000201

5| Commissioning

The compressor shaft is sealed to outside using a shaft seal. The sealing element rotates with the

shaft.

The following is especially important to ensuring fault-free operation:

The complete refrigerant circuit must be correctly executed and clean inside.

Heavy shocks and vibrations to the shaft as well as continuous cyclic operation are to be avoided.

 Thesealingsurfacescansticktogetherduringprolongeddowntimes(e.g.winter).Therefore,run

the system every 4 weeks for 10 minutes.

5.8 Avoidingliquidshocks

Toavoidliquidshocks,thefollowingpointsshouldbeobserved:

The complete refrigeration plant must be correctly designed and executed.

The capacities of all components must be compatible (particularly evaporator and expansion

valve).

Suction gas superheating at the evaporator output should be at least 7 – 10 K (check setting of

theexpansionvalve).

 Thesystemmustreachastateofequilibrium.

 Particularly incritical systems (e.g. several evaporator points), suitable measures, e.g. use of

liquidtraps,solenoidvalveintheliquidline,etc.arerecommended.

ATTENTION Slugging can damage the compressor and cause refrigerant to

leak.

6.1 Preparation

6.2 Work to be carried out

Oil change: Inprinciple,anoilchangeisnotamandatoryrequirement,iftheequipmentiscorrectly

manufactured and properly operated. Based on decades of experience, we recommend however that

the following oil change/service work is carried out:

• Initialoilchangeduringtherstmaintenanceofthevehicle(atthelatestafteroneyear)

• Thenafterevery5,000operatinghours,atthelatesthoweverafter3years.Alsocleantheoillter.

• An oil change is also necessary, if the oil is very cloudy and dark, or after repairs have been carried

out on the compressor.

Emptying the shaft seal oil reservoir:Asrequireddependingonuse,butatthelatestafter1year

or approx. 1,400 operating hours

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.

6| Maintenance

Danfoss BOCK FK40 User Manual

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