Stulz CyberCool - 11.2 Refrigerant circuit

58
OPTION
EN/09.2017/G44 © STULZ GmbH – all rights reserved
cybercool indoor chiller original instructions
Refrigerant circuit of a GE unit
Chilledwater
circuit
Primarycircuit
Evaporator
Condenser
Coolingmediumcircuit
Secondary circuit
Crankcaseheater
HGBPvalve
11.2 Refrigerant circuit
Crank case heater
Aroundthecrankcaseofthecompressor,anelectricalheaterisinstalled,whichisinoperation,whenthe
compressorisswitchedoff,toassuretheconstantoillubricityatthecompressorstartwithlowambienttem-
peratures. The power depends on the compressor size from 34 W to 150 W.
Pressure gauge in the refrigerating circuit
to indicate the suction pressure and/or the condensation pressure
Hotgas Bypass, electronically controlled (for GE units only)
The unit can be eqipped with an electronically controlled hotgas bypass for the proportional capacity control
in the range of 40 to 100% of the nominal cooling capacity. The hotgas bypass valve is commanded and pro-
portionallycontrolledbytheC7000controller.
A part of the hotgas bypasses the condenser by the hotgas bypass line and is fed upstream the evaporator.
This lets the evaporation temperature rise whereas the cooling capacity sinks.