GEA Bock HGZ Series - 7 Commissioning; Preparations For Start-Up; Pressure Strength Test; Evacuation

28
D
GB
F
E
09726-09.2013-DGbF
7| Commissioning
7.1 Preparations for start-up
7.4 Evacuation
 Firstevacuatethesystemandthenincludethe compressor in the evacuation process.
 Relievethecompressorpressure.
 Openthesuctionandpressurelineshut-offvalves.
 Evacuatethesuctionanddischargepressuresidesusingthevacuumpump.
 Attheendoftheevacuationprocess,thevacuumshouldbe<1.5mbarwhenthepumpisswitchedoff.
 Repeatthisprocessasoftenasisrequired.
Inadditiontothesuctionorhighpressureside,theintermediatepressureareaofthecompressor
mustalsobeevacuated(useconnectionX,seepage16,g.18).Thesolenoidvalveofthe
subcoolingsystem(page17,g.19,item3)mustbeopened.
ATTENTION! Do not start the compressor if it is under vacuum. Do not apply
any voltage - even for test purposes (must only be operated with
refrigerant).
 Undervacuum,the spark-over and creepage current distancesof the
 terminalboardconnectionboltsshorten;thiscanresultinwindingand
 terminalboarddamage.
INFO! In order to protect the compressor against inadmissible operating
conditions,high-pressureandlow-pressurepressostats controls are
mandatory on the installation side.
Thecompressorhasundergonetrialsinthefactoryandallfunctionshavebeentested.Thereare
thereforenospecialrunning-ininstructions.
Checkthecompressorfortransportdamage!
7.2 Pressure strength test
DANGER! Bursting! The compressor must only be pressurised using nitrogen
(N
2
). Never pressurise with oxygen or other gases!
The maximum permissible overpressure of the compressor must not
be exceeded at any time during the testing process (see name plate
data)! Do not mix any refrigerant with the nitrogen as this could
cause the ignition limit to shift into the critical range.
Thecompressorhasbeenfactory-testedforpressureresistance.Thefollowingmustbeobservedif
theentireplantissubjectedtoanadditionalpressurestrengthtest:
 TesttherefrigerationcircuitaccordingtoEN378-2oracorrespondingsafetystandard.
7.3 Leaktest
DANGER! Bursting!
Do not mix any refrigerant with the nitrogen (N
2
) as this could cause
the ignition limit to shift into the critical range.
CarryouttheleaktestoftherefrigeratingsysteminaccordancewithEN378-2oracorresponding
 safetystandardwithout including the compressor.