GEA Bock HGZ Series - Avoiding Liquit Sluggings

30
D
GB
F
E
09726-09.2013-DGbF
7.7 Avoidingliquidsluggings
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.
When selecting the evaporator expansion valve, pay attention to correction factors for liquid
subcooling. Avoid transfer of refrigerant into the compressor when the system is at a
standstill.
Theuseofaliquidseparatorisrecommended.
7| Commissioning
ATTENTION!ToavoidliquidshocksontheHPstage,theexpansionvalvemayonly
be opened approx. 15-20 seconds after the compressor is switched
on (full load operation).
At compressor shut-down:
Close the solenoid valve approx. 15 - 20 seconds before the com-
pressor is switched off.