GEA Bock HG44e Series - Areas of application at HC and LG compressors; Refrigerants; Oil charge; Operating limits

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5 | Areas of application at HC and LG compressors
5.3 Operatinglimits
ATTENTION Compressor operation is possible within the operating limits.
ThesecanbefoundinBockcompressorselectiontool (VAP)under
vap.bock.de. Observe the information given there and the follo-
wingnotes:
-Minimumsuperheating∆t
Oh
=20K(onlyatHCcompressors)
Inordertoguaranteetherequiredminimumsuperheatingof∆t
Oh
=20K,aninternalheatexchangerIHXmayhavetobeinstalled.
(onlyatHCcompressors)
- Min.pressuregastemperature≥50°C(min.20Kovercondens-
ingtemperature). Suctiongassuperheatingoncompressorent-
ranceshouldbemin.7-10K,mustbeincreasedifnecessary
(onlyatLGcompressors)
-Min.oiltemperature≥ 30°C.
-Operationinthevacuumrangeisnotpermitted.
During operation in the vacuum range, there is a danger of air
entering on thesuction side. This can cause chemical reactions,
pressureriseinthecondenserandanexcessivepressuregastem-
peratureaswellasshiftingoftherefrigerantignitionlimitintothe
criticalrange.Avoidabsolutelyanyentryofair!
Usealowpressureswitch!Selectashut-offpointmin.50Pahigher
thantheprevailingsurroundingpressure!
5.1 Refrigerants
• Hydrocarbons: 
R290,R1270(Recommendationquality2.5(<50ppmH
2
O))
• HFOrefrigerants:  R1234ze,R1234yf,R455A,R454C
5.2Oilcharge
Thecompressorsarefactory-chargedwiththefollowingoiltype:
• HCcompressors:  FUCHSRenisoSynth68
• LGcompressors:  FUCHSRenisoTritonSE55
    FUCHSRenisoC85E(fromt
O
>15°C,mustbespecifiedintheorder)
Maximumpermissibleoperating
pressure(LP/HP)
1)
:19/28bar
1)
LP=LowpressureHP=Highpressure