GEA Bock HG66e Series User Manual

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6 | Compressor assembly
Fig. 5
6.3 Pipeconnections
ATTENTION Damagepossible.
Superheatingcandamagethevalve.
Removethepipesupportsfromthevalveforsoldering.
Onlysolderusinginertgastoinhibitoxidationproducts(scale).
Thedischargegasconnectioncanbemovedupwardswithan
adapter(accessory).Thismakesiteasiertoremovethecom-
pressorfromarefrigeratingsystem.
Fig. 4: graduated
internal diameter
Pipe connections on the compressor are available for soldering or
welding (accessories). The dischargeandsuctionlinevalves have
graduated inside diameters so that pipes with standard millimetre and
inch dimensions can be used. The pipe will be immersed more or less
deeply according to dimension.
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.
6.4 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.
6.5 Startunloader(external)
A internal start unloader ex factory is not available. Alternatively a start unloader can be installed in
the plant.
Operation:
When the compressor is started, a solenoid valve receives power via a time switch and opens a by-
pass between the discharge- and suction line. At the same time, a non-return valve in the discharge
lineclosesandpreventsabackowofrefrigerantfromthecondenser(Fig.5).
Thecompressorisnowshort-circuitedanddeliversfromtheoutowdirectlyintotheintake.The
pressuredifferentialconsequentlydecreasessubstantially.Asaresult,thetorqueonthedriveshaft
of the compressor is considerably diminished. The drive motor can now start with a low level of
startingtorque. As soon asthemotor andthe compressor reachtheirrated speed,the solenoid
valve closes and the non-return valve opens (Fig. 6). The compressor now works under normal load.
Solenoid valve actuated
Non-return valve closed

GEA Bock HG66e Series Specifications

General

Brand	GEA Bock
Model	HG66e Series
Category	Air Compressor
Language	English