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09790-02.2018-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 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.

6.6 Start-up

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!

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.

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 sight glass.

GEA Bock HG8 Series User Manual

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