User guide

D
GB
F
E
21
96192-11.2014-DGbFE
6 | Commissioning
CAUTION! Wear personal protective clothing such as goggles and
protective gloves!
Make sure that the suction and discharge line 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.
INFO!
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.
6.5 Refrigerant charge
6.7 Avoidingliquidsluggings
ATTENTION!Sluggingcandamagethecompressorandcausecoolanttoleak.
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 refrigerant in the compressor while the system is at a
standstill.
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
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.
 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!