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96178-06.2015-DGbFEIRu

6| Commissioning

Makesurethatthesuctionandpressurelineshut-offvalvesareopen.

 Withthecompressorswitchedoff,addtheliquidrefrigerantdirectlytothecondenserorreceiver,

breakingthevacuum.

 Iftherefrigerantneedstoppingupafterstartingthecompressor,itcanbetoppedupinvapour

formonthesuctionside,or,takingsuitableprecautions,alsoinliquidformattheinlettothe

evaporator.

6.5 Refrigerant charge

CAUTION Wear personal protective clothing such as goggles and protective

gloves!

ATTENTION Avoidoverllingthesystemwithrefrigerant!

To avoid shifts in concentration, zeotropic refrigerant blends (e.g.

R407C)mustalwaysonlybelledintotherefrigeratingplantin

liquidform.

Donotpourliquidcoolantthroughthesuctionlinevalveon

the compressor.

It is not permissible to mix additives with the oil and refrigerant.

6.7 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).

 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.

6.6 Start-up

 Checkthatthesafetyandprotectiondevices(pressureswitch,motorprotection,electrical

contactprotectionmeasures,etc.)areallfunctioningproperly.

 Switchonthecompressorandallowtorunforaminimumof10min.

Check the oil level by:Theoilmustbevisibleinthesightglass.

WARNING Ensure that both shut-off valves are open before starting the

compressor!

ATTENTION Iflargerquantitiesofoilhavetobetoppedup,thereisariskof

oil hammer effects.

If this is the case check the oil return!

GEA Bock HG34e Series User Manual

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