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09706-09.2013-DGbFEI

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.

CAUTION! Wear personal protective clothing such as goggles and protective

gloves!

6.5 Refrigerant charge

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

In order to prevent shifts in concentration,zeotropic refrigerant

blends (e.g. R407C) must always only be added to the refrigerating

systeminliquidform.

Donotpourliquidrefrigerantthroughthesuctionlineshut-offval-

ve 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!

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

tact protection measures, etc.) are functioning properly.

Switch on the compressor and let it run for at least 10 minutes.

Check the oil level : The oil must be visible in the sight glass.

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

impacteffects.Ifthisisthecase,checktheoilreturn!

6.7 Avoid slugging

ATTENTION! Slugging can result in damage to the compressor and cause

  refrigeranttoleak.

To prevent slugging:

The complete refrigeration plant 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 superheating 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suchastheuseofliquid

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

There should be no movement of refrigerant in the compressor while the system is at a

standstill.

GEA HG7 Series User Manual

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