GEA HGX4 CO2 Series User manual

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engineering for a better world GEA Refrigeration Technologies
Bock Compressor HGX4 CO2
Assembly instructions
HGX4/310-4 CO2
HGX4/385-4 CO2
HGX4/465-4 CO2
HGX4/555-4 CO2
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About these instructions
Read these instructions before assembly and before using the compressor. This will avoid misunder-
standings and prevent damage. Improper assembly and use of the compressor can result in serious
or fatal injury.
Observe the safety instructions contained in these instructions.
These instructions must be passed onto the end customer along with the unit in which the compres-
sor is installed.
GEA Bock GmbH
72636 Frickenhausen
GEA Bock GmbH
Benzstraße 7
72636 Frickenhausen
Germany
Telephone [phone]
Fax [phone]
[email protected]
www.bock.de
Manufacturer
Contact
1 Safety 4
 1.1 Identicationofsafetyinstructions
 1.2 Qualicationsrequiredofpersonnel
1.3 General safety instructions
1.4 Intended use
2 Product description 6
2.1 Short description
2.2 Name plate
2.3 Type key
3 Areas of application 8
3.1 Refrigerants
3.2 Oil charge
3.3 Limits of application
4Compressor assembly 9
4.1 Setting up
4.2 Pipe connections
4.3 Pipes
4.4 Laying suction and pressure lines
4.5 Operating the shut-off valves
4.6 Operating mode of the lockable service connections
5 Electrical connection 12
5.1 Information for contactor and motor contactor selection
5.2 Standard motor, design for direct or partial winding start
5.3 Basic circuit diagram for partial winding start with standard motor
5.4 Electronic trigger unit MP 10
5.5 Connection of the electronic trigger unit MP 10
5.6 Functional test of the electronic trigger unit MP 10
5.7 Oil sump heater (accessories)
6 Commissioning 18
6.1 Preparations for start-up
6.2 Pressure strength test
6.3 Leak test
6.4 Evacuation
6.5 Refrigerant charge
6.6 Start-up
6.7 Decompression valves
6.8 Avoiding slugging
6.9 Connection of oil level regulator
7 Maintenance 22
7.1 Preparation
7.2 Work to be carried out
7.3 Spare parts recommendation
7.4 Accessories
7.5 Extract from the lubricants table
7.6 Decommissioning
8 Technical data 25
9 Dimensions and connections 26
10 Declaration of conformity and installation 28
11 Service 29

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Contents Page
1 Safety 4
 1.1 Identicationofsafetyinstructions
 1.2 Qualicationsrequiredofpersonnel
1.3 General safety instructions
1.4 Intended use
2 Product description 6
2.1 Short description
2.2 Name plate
2.3 Type key
3 Areas of application 8
3.1 Refrigerants
3.2 Oil charge
3.3 Limits of application
4Compressor assembly 9
4.1 Setting up
4.2 Pipe connections
4.3 Pipes
4.4 Laying suction and pressure lines
4.5 Operating the shut-off valves
4.6 Operating mode of the lockable service connections
5 Electrical connection 12
5.1 Information for contactor and motor contactor selection
5.2 Standard motor, design for direct or partial winding start
5.3 Basic circuit diagram for partial winding start with standard motor
5.4 Electronic trigger unit MP 10
5.5 Connection of the electronic trigger unit MP 10
5.6 Functional test of the electronic trigger unit MP 10
5.7 Oil sump heater (accessories)
6 Commissioning 18
6.1 Preparations for start-up
6.2 Pressure strength test
6.3 Leak test
6.4 Evacuation
6.5 Refrigerant charge
6.6 Start-up
6.7 Decompression valves
6.8 Avoiding slugging
6.9 Connection of oil level regulator
7 Maintenance 22
7.1 Preparation
7.2 Work to be carried out
7.3 Spare parts recommendation
7.4 Accessories
7.5 Extract from the lubricants table
7.6 Decommissioning
8 Technical data 25
9 Dimensions and connections 26
10 Declaration of conformity and installation 28
11 Service 29

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1|Safety
1.2 Qualicationsrequiredofpersonnel
1.3 General safety instructions
WARNING! Inadequately qualied personnel poses the risk of accidents, the
consequence being serious or fatal injury. Work on compressors
mustthereforeonlybeperformedbypersonnelwiththequalica-
tions listed below:
 •For example, a refrigeration technician, refrigeration mechatron-
ics engineer. As well as professions with comparable training, which
enable personnel to assemble, install, maintain and repair refrigeration
and air-conditioning systems. Personnel must be capable of assessing
thework to be carried out and recognising any potential dangers.
WARNING! •Refrigerating compressors are pressurised machines and
thereforerequireparticularcautionandcareinhandling.
•Risk of burns! Depending on the operating conditions, surface
temperatures of over 60 °C on the pressure side or below 0 °C on
the suction side can be reached.
•The maximum permissible overpressure must not be exceeded,
even for testing purposes.
1.1 Identicationofsafetyinstructions:
DANGER! Indicatesadangeroussituationwhich,ifnot
 avoided,willcauseimmediatefatalorseriousinjury.
WARNING!
 Indicatesadangeroussituationwhich,ifnot
 avoided,maycausefatalorseriousinjury.
CAUTION!
 Indicatesadangeroussituationwhich,ifnot
 avoided,maycausefairlysevereorminorinjury.
ATTENTION! Indicatesasituationwhich,ifnot
 avoided,maycausepropertydamage.
INFO! Importantinformationortipsonsimplifyingwork.
WARNING! DANGER OF SUFFOCATION!
 NeverreleasesignicantvolumesofCO2or the entire contents of
the system into closed rooms!

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1|Safety
These assembly instructions describe the standard version of the HGX4 -CO2manufactured by Bock.
The compressor is intended for use with CO2in sub-critical systems in compliance with the limits of
application.
Onlytherefrigerantspeciedintheseinstructionsmaybeused.
Any other use of the compressor is prohibited!
1.4 Intended use
WARNING! The compressor may not be used in potentially explosive
environments!
The Bock refrigerating compressor named in the title is intended for installing in a machine (within
theEUaccordingtotheEUDirectives2006/42/ECMachineryDirective,97/23/ECPressureEquipment
Directive and 2006/95/EC – Low Voltage Directive).
Commissioning is only permissible if the compressor has been installed in accordance with these
assembly instructions and the entire system into which it is integrated has been inspected and
approved in accordance with legal regulations.

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Name plate
Fig. 1
Fig. 2
Oil sight glass
Valve plate
Cylinder cover
Discharge
shut-off valve
Oil pump
Terminal box
Suction
shut-off valve
Drive section
Motor section
Dimension and connection values can be found in Chapter 9
Transport eyelet
2|Product description
• Semi-hermeticfour-cylinderreciprocatingcompressorwithsuction-gascooleddrivemotor.
• Flange-mounted drive motor on the compressor case.
• The stream of refrigerant sucked out of the evaporator flows over the motor and cools it
intensively. In this way, the motor can be kept at a relatively low temperature level, particularly
under high loads
2.1 Short description

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AS12345-001
27/55
C85E
2|Product description
2.2 Name plate (example)
2.3 Typekey (example)
¹) HG - Hermetic Gas-Cooled (suction gas-cooled) for deep-freezing
²) X - Ester oil charge
Fig. 3
/
HG 4310- 4CO2 X
CO2Version
Number of poles
Swept volume
Size
Oil charge ²)
Series ¹)
1 Typedesignation 6 Voltage,circuit,frequency
2 Machine number 7 Nominal rotation speed
3 maximum operating current 8 Displacement
4 Startingcurrent(rotorblocked) 9 Voltage,circuit,frequency
Y: Part winding 1 10 Nominal rotation speed
YY: Part windings 1 and 2 11 Displacement
5 ND (LP): max. admissible operating  12 Oiltypelledatthefactory
pressur e (g) Low pressure side 13 Terminal box protection type
HD (HP): max. admissible operating Electrical accessories can change
pressur e(g) High pressure side the IP protection class!
Observe the limits of application
diagrams!
50 Hz
}
60 Hz
}
GEA Bock GmbH
72636 Frickenhausen, Germany

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3|Areas of application
ATTENTION! Compressor operation is possible within the operating limits
shown in the diagrams. Please note the signicance
of the shaded areas. Thresholds should not be selected as design
or continuous operation points.
- Max. permissible discharge end temperature 140 °C
    -Max.permissibleswitchingfrequency12x/h.
- A minimum running time of 3 min. steady-state condition
(continuous operation) must be achieved.
Foroperationwithfrequencyconverter:
- The maximum current and power consumption must not be
exceeded. Inthecaseofoperationabovethemainsfrequency,
the application limit can therefore be limited.
 Thecompressorsarelledatthefactorywiththefollowingoiltype:
BockC85E(onlythisoilmaybeused)
3.1 Refrigerants
• CO2: R744
3.2 Oil charge
3.3 Limits of application
Evaporation temperature (°C)
Condensing temperature (°C)
Suction gas superheat (K)
Fig. 5
R744
1
2
Max. permissible operating
pressure (LP/HP)1): 27/55 bar
1) LP = Low pressure
HP = High pressure
Unlimited
application range
1HGX4/385-4 CO2
Maximum condensing
temperature tc= 0°C
2HGX4/555-4 CO2
Maximum condensing
temperature tc= -7,5°C
The oil level must be in the visible
part of the sight glass; damage
to the compressor is possible if
overfilled or underfilled!
ATTENTION!
Fig. 4
max. oil level
min. oil level

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?
4|Compressor assembly
4.1 Setting up
 Setuponanevensurfaceorframewithsufcientload-
bearing capacity.
Single compressor preferably on vibration damper.
Duplex and parallel circuits always rigid.
Use transport eyelet.
Do not lift manually!
Use lifting gear!
 Provideadequateclearanceformaintenancework.
 Ensureadequatecompressorventilation.
Do not use in a corrosive, dusty, damp atmosphere or a
combustible environment.
Fig. 6
Fig. 7
Fig. 8
Fig. 9
4.2 Pipe connections
The pipe connections have graduated inside diameters so that pipes with
standart millimetre and inch dimensions can be used.
The connection diameters of the shut-off valves are rated for maximum
compressor output. Theactualrequiredpipecrosssectionmustbe
matched to the output. The same applies for non-return valves.
Fig. 10: graduated
internal diameter
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Tol.-Ang. DIN ISO 2768-mK
Ra Rz
Maß Passung
Freigabe
Alternativbezug:
Baumustergeprüft
Teil inaktiv
Lieferantenzeichnung
-
-
K.-Auftrag:
PL:
Zeichnung ungültig
Entwicklungsstand
Teil keine Serie
120
400
±0.5
über 0.5
bis 6
Benzstraße 7 - 72636 Frickenhausen - Germany - www.bock.de
-
-
Unbemaßte Radien:
-
Diese Zeichnung ist unser Eigentum!
Sie darf ohne unsere Genehmigung weder nach-
gebildet, vervielfältigt, oder Dritten Personen zu-
gänglich gemacht werden. Der Nachbau nach
dieser Zeichnung, oder an Hand der nach dieser
Zeichnung hergestellten Gegenstände durch den
Abnehmer oder Dritte ist nicht gestattet.
Wir behalten uns alle Rechte, gemäß DIN ISO 16016
an dieser Zeichnung vor.
Bearb.
Datum
Änderungs-Nr.
Werkstoff:
Ausgangsteil, bzw. Rohteil:
--
Gepr.
Name Datum
19.04.
Werkstückkanten
DIN ISO 13715
Ersatz für:
Ersetzt durch:
Erstellt
2010
Geprüft
-
Kurz
Zone
1/x
Oberflächenbehandlung / Härte:
-
Blatt:
Änderungsbeschreibung
400
Benennung:
±0.8
1000
30 6
-
±0.3
120
30
±0.2
Zeichn.-Nr. Teile-Nr.
Oberflächenangaben ISO 1302
x.xxxx-xxxxx.x
Zust.
Gußtoleranzen:
Gewicht: (kg)
±0.1
Maßstab:
1:1
Wasserwaage
für Indesign
Der Lieferant muß sicherstellen, dass die Ware in
einwandfreiem Zustand angeliefert wird (Korrosions-
schutz, Verpackung für sicheren Transport).
Rz 25
Rz 160
s
25
z y x w u t
0,05
Rz 1,6
0,3
0,7
1,6
2
Rz 16
6,3
Rz 63
Rz 6,3
Rz 12,5
F:\user\kurz\3D Sachen\3D Teile\Zeichnungen\Wasserwaage
INFO! Newcompressorsarefactory-lledwithinertgas(3barnitrogen).
Leave this service charge in the compressor for as long as possible
and prevent the ingress of air.
  Check the compressor for transport damage before starting any
 work.
ATTENTION! Do not solder as long as the compressor is under pressure.
Superheating can damage the valve. Remove the pipe supports
therefore from the valve for soldering and accordingly cool
the valve body during and after soldering.
Only solder using inert gas to inhibit oxidation products (scale).

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4.4 Laying suction and pressure lines
INFO! Proper layout of the suction and pressure lines directly after the
compressor is integral to the smooth running and vibration behaviour
of the system.
ATTENTION! Improperly installedpipes cancause cracksand tearswhichcan
result in a loss of refrigerant.
A rule of thumb:
Alwayslaytherstpipesectionstartingfromtheshut-offvalvedownwards and
parallel to the drive shaft.
4|Compressor assembly
4.3 Pipes
Pipes and system components must be clean and dry inside and free of scale, swarf and layers of
rust and phosphate. Only use air-tight parts.
Lay pipes correctly. Suitable vibration compensators must be provided to prevent pipes being
cracked and broken by severe vibrations.
Ensure a proper oil return.
Keep pressure losses to an absolute minimum.
Fig. 11
Rigid
fixed point
As short as
possible

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Valve spindle seal
Release
Tighten
Fig. 12 Fig. 13
4|Compressor assembly
Before opening or closing the shut-off valve, release the valve spindle seal by approx. ¼ of a turn
counter-clockwise.
After activating the shut-off valve, re-tighten the adjustable valve spindle seal clockwise.
4.5 Operating the shut-off valves
Pipe connection
Pipe connection
4.6 Operatingmodeofthelockableserviceconnections
Fig. 14
Opening the shut-off valve:
Spindle: turn to the left (counter-clockwise) as far as it will go.
—> Shut-off valve completely opened / service connection closed.
The connection which cannot be shut off is intended for safety devices.
Fig. 15
Opening the service connection
Spindle: Turn ½ - 1 turn to the right clockwise.
—> Service connection opened / shut-off valve opened.
The connection which cannot be shut off is intended for safety devices.
Service connec-
tion closed
Connection
blocked
Spindle
Connection cannot be
shut off
Connection cannot be
shut off
Service connec-
tion opened
Spindle Connection
open
Compressor
Compressor

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5|Electrical connection
5 Electrical connection
  DANGER! Highvoltage!Riskofelectricshock!Onlycarryoutworkwhenthe
electrical system is disconnected from the power supply!
INFO! Connect the compressor motor in accordance with the circuit diagram
(see inside of terminal box).
Use suitable cable entry point of the correct protection type
(see name plate) for routing cables into the terminal box.
Insert the strain reliefs and prevent chafe marks on the cables.
Comparethevoltageandfrequencyvalueswiththedataforthemains
power supply.
Only connect the motor if these values are the same.
5.1 Information for contactor and motor contactor selection
Allprotectionequipment,switchingandmonitoringdevicesmustcomplywiththelocalsafetyregula-
tionsandestablishedspecications(e.g.VDE)andregulationsaswellasthemanufacturer’sspecica-
tions. Motorprotectionswitchisrequired! Motor contactors, feed lines, fuses and motor protection
switches must be rated according to the maximum operating current (see name plate).
Use the following overload protection device:
A current-dependent time-delayed overload protection device for monitoring of all three phases, not
set higher than the rated current of the machine, which must respond at 1.2 times the set current
within 2 hours and must not have responded at 1.05 times the set current within 2 hours, or another
comparable device.

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5|Electrical connection
5.2 Standardmotor,designfordirectorpartialwindingstart
Designation on the name plate Sticker on the terminal box
Y/YY
Compressors with this marking are suitable for direct or partial winding start. The motor winding is
subdivided into two parts: Partial winding 1 = 66% and part winding 2 = 33%. This winding division
reduces the start-up current needed for a part winding start to approx. 65% of that for a direct start.
INFO! A mechanical unloaded start with bypass solenoid valve is
 notrequired.
400 V
Direktstart YY Teilwicklungsstart Y/YY
1V1 1W11U1
2W12V12U1
L3L2L1 L3L2L1
L3L2L1
1V1 1W11U1
2W12V12U1
Direct start YY
Part winding start Y/YY
ATTENTION! Failure to do this results in opposed rotary elds and results in
damage to the motor. After the motor starts up via partial winding
1,partialwinding2mustbeswitchedonafteramaximumdelayof
one second . Failure to comply can adversely affect the service life
of the motor.
The motor is wired for direct start (YY) at the factory. For part winding start (Y/YY) the bridges must be
removed and the motor feed line connected according to the circuit diagram:

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














  







 



 










5.3 Basic circuit diagram for partial winding start with standard motor
Fig. 16
1-2 Connections for PTC sensor (MP 10)
R1 Cold conductor PTC sensor motor winding
R2 Thermal protection thermostat (PTC sensor)
F1.1/F1.2 Load circuit safety switches
F2 Control power circuit fuse
F3 / F4 Safety chain (high/low pressure monitoring)
F5 Oil differential pressure monitor
B1 Release switch (thermostat/pressostat)
Q1 Main switch
Compressor terminal box

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

 















  











    




































         










 

















  







 



 










S1 Control voltage switch
M1 Compressor motor
K1 Mains contactor (part winding 1)
K2 Mains contactor (part winding 2)
K1T Delay relay max. 1s
MP10 Electronic trigger unit MP 10
E1 Oil sump heater
XSS Terminal strip in the external switch cabinet

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5|Electrical connection
Temperature monitoring connections:
Motor winding: Terminals 1 - 2
Thermal protection thermostat: Terminals 3 - 4
Restart prevention: Terminals 5 - 6
ATTENTION!
Terminals 1 - 6 on the trigger
unit MP 10 and terminals PTC
1 and PTC 2 on the compres-
sor terminal board must not
come into contact with mains
voltage. This would destroy the
trigger unit and PTC sensors.
The supply voltage at L1-N
(+/- for DC 24 V version) must
be identical to the voltage at
terminals11,12,14and43.
5.4 Electronic trigger unit MP 10
The compressor motor is tted with cold conductor temperature sensors (PTC) connected to the
electronic trigger unit MP 10 in the terminal box. Readiness to operate is signalled by the H3 LED
(green) after the power supply is applied. In the case of excess temperature in the motor winding, the
unit switches off the compressor and the H1 LED lights red.
The hot gas side of the compressor can also be protected against overtemperature using a thermal
protection thermostat (accessory). The H2 LED (red) is provided for the protection function.
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
5.5 Connection of the trigger unit MP 10
INFO! Connect the trigger unit MP10 in accordance with the circuit dia-
gram. Protect the trigger unit with a delayed-action fuse (F) of max.
4A.Inordertoguaranteetheprotectionfunction,installthetrigger
unitastherstelementinthecontrolpowercircuit.
INFO! Theunithasarestartpreventiondevice.Afteryouhaverectiedthe
fault,interruptthemainsvoltage.Thisunlockstherestartprevention
device and the LEDs H1 and H2 go out.
Fig. 17
Terminal board

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5.7 Oil sump heater (accessories)
ATTENTION! The oil sump heater must generally be connected and operated.
Inordertoavoiddamagetothecompressor,thecompressormustbeequippedwithanoilsump
heater.
Connexion: The oil sump heater must be connected via an auxiliary contact (or parallel wired auxiliary
contact) of the compressor contactor to a seperate electric circuit.
Electrical data: 230 V - 1 - 50/60 Hz, 80 W.
5|Electrical connection
The compressor and the trigger unit MP10 are operational when the H3 LED (green) lights.
5.6 Function test of the trigger unit MP 10
Pos Procedure LED H1 LED H2 LED H3
red red green
1•Interrupt power supply (L1 or S1) OFF OFF OFF
•Release the motor temperature sensor connection (1 or 2)
•Release the hot gas temperature sensor (if installed) (3 or 4)
2•Restore the power supply (L1 or S1) ON
•Function check of motor temperature sensor: operational ON
•Function check of hot gas temperature sensor: operational ON
3•Interrupt power supply again (L1 or S1) OFF OFF OFF
•Reconnect terminals 1 or 2 and/or 3 or 4
4•Restore the power supply (L1 or S1): OFF OFF ON
•MP 10 is operational again
Before start-up, troubleshooting or making changes to the control power circuit, check the functionality
of the trigger unit:

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6|Commissioning
WARNING! Whenthecompressorisnotrunning,dependingonambient
 temperatureandamountofrefrigerantcharge,itispossiblethat 
the pressure may rise and exceed permitted levels for the
 compressor.Adequateprecautionsmustbetakentoprevent
 thishappening(e.g.usingacoldstoragemedium,areceivertank,
asecondaryrefrigerantsystem,orpressurereliefdevices).
6.1 Preparations for start-up
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!
6.2 Pressure strength test
DANGER! Bursting! The compressor must only be pressurised using nitrogen
(N2). 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.
6.3 Leaktest
DANGER! Bursting!
Do not mix any refrigerant with the nitrogen (N2) 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.

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6|Commissioning
Make sure that the suction and pressure line shut-off valves are open.
INFO! Depending upon design of the CO2refrigerantllingbottle
(with/without tubing) CO2canbelledinliquidafterweightor
gaseously.
Use only high-dried CO2quality!
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.
CAUTION! Wear personal protective clothing such as goggles and protective
gloves!
6.5 Refrigerant charge
Fillingtheliquidrefrigerant:Itisrecommendedthatthesystemrstbelled
at standstill with gas on the high-pressure side up to a system pressure of at
least5.2bar(ifitislledbelow5.2barwithliquid,thereisariskofdryice
formation).Furtherllingaccordingtosystem.
To eliminate the possibility of dry ice formation when the system is operating
(duringandafterthellingprocess),theshut-offpointofthelow-pressure
switch should be set to a value of at least 5.2 bar.
6.4 Evacuation
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.
•Arefrigerantsupplement,whichmaybecomenecessaryafterstart-up,canbe
topped up in vapour form on the suction side.
ATTENTION! Avoid overfilling the machine with refrigerant!
Donotchargeliquidrefrigerantintothesuction-sideonthe
compressor.
Do not mix additives with the oil and refrigerant.
WARNING! Never exceed the max. permissible pressures while charging.
Precautionsmustbetakenintime(eg.operatingauxiliaryconden-
sing unit for standstill pressure control or high pressure stage of
the cascade).

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6|Commissioning
Thecompressoristtedwithtwodecompressionvalves.Onevalveeachonthe
suctionanddischargeside.Ifexcessivepressuresarereached,thevalvesopen
and prevent further pressure increase.
Thereby CO2is blown off to the ambient! (see also Chapter 7.6)!
Intheeventthatapressurereliefvalveactivatesrepeatedly,checkvalveand
replaceifnecessaryasduringblow-offextremeconditionscanoccure,which
mayresultinapermanentleak.Alwayschecksystemforrefrigerantlossafter
activation of pressure relief valve!
The decompression valves do not replace any pressure switches and the
additional safety valves in the system.Pressure switches must always be installed
inthesystemanddesignedoradjustedinaccordancewithEN378-2orappro-
priate safety standards.
FailuretoobservecanresultinriskofinjuryfromCO2streaming out of the two
decompression valves!
6.7 Decompression valves
6.6 Start-up
WARNING! Ensure that both shut-off valves are open before starting the
compressor!
Check that the safety and protection devices (pressure switch, motor protection, electrical contact
protection measures, etc.) are functioning properly.
Switch on the compressor and let it run for at least 10 minutes.
Themachineshouldreachastateofequilibrium.
Check the oil level: The oil level must be visible in the sight glass.
After a compressor is replaced, the oil level must be checked again. If the level is too high, oil
mustbedrainedoff(dangerofoilliquidshocks;reducedcapacityoftherefrigeratingsystem).
CO2 streaming
out
Fig. 18
ATTENTION! Iflargerquantitiesofoilhavetobetoppedup,thereisariskofoil
impacteffects.Ifthisisthecase,checktheoilreturn!
GEA Boc
72636 Fricke
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