GEA Bock HG66e Series - Evacuation; Refrigerant Charge; Start-Up

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8.4 Evacuation
First evacuate the system and then include thecompressorintheevacuationprocess.
Relieve the compressor pressure.
Open the suction and pressure line shut-off valves.
Evacuate the suction and discharge pressure sides using the vacuum pump.
 Attheendoftheevacuationprocess,thevacuumshouldbe<1.5mbarwhenthepumpisswitchedoff.
 Repeatthisprocessasoftenasisrequired.
ForHCandLGcompressorssuitableequipmentapprovedforammablerefrigerants
mustbeused.
ATTENTION Donotstartthecompressorifitisundervacuum.Donotapply
anyvoltage-evenfortestpurposes(mustonlybeoperatedwith
refrigerant).
Under vacuum, the spark-over and creepage current distances of the
terminal board connection bolts shorten; this can result in winding and
terminal board damage.
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.
8.5 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.
8.6 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 sight glass.
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!
8 | Commissioning