User guide

26
D
GB
F
E
96280-12.2014-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.
6.7 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!