22
Filling and air purging an externally closed system
Caution!
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For additional protection of a fragile application (e.g. glass reactor), chillers with
pumps, which are able to build pressures up to 3 bar, are equipped with a VPC
Bypass. Outlet pressure can be set via a valve which is next to the inlet nozzles
(Check the manometer display on the front of the chiller). Before operating the
machine, turn the valve to the left endstop (Anticlockwise). Then on starting the
pump, the smallest possible pressure will be produced.
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Fill to the unit to the minimum level necessary.
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Please refer to local regulations and internal procedures.
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When filling the unit, extra precautions such as earthing the expansion tank, fluid
container funnel and application may be necessary.
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Personal Protection Equipment (PPE) should be worn as required by the fluid
MSDS sheets, and local regulation.
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Please note the temperature of the thermal fluid. The fluid should be left a room
temperature for a few minutes before draining.
Warning!
Overflowing thermal fluid will create a film on surfaces, which should be cleaned up and
properly disposed of as soon as possible in accordance with the MSDS information. If
thermal fluid is spilled over the unit, the unit should be immediately turned off, and
Huber-trained personnel consulted.
Failure to observe the above precautions may mean that the unit will not comply with
all of the requirements of DIN EN 61010-2-010.
Filling and air purging
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Lift the bath cover / lid from the bath / inlet connections
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Carefully pour a suitable thermal fluid into the expansion tank, filling hole (17)
with help of appropriate accessories such as a funnel and / or beaker. The
thermal fluid flows via the expansion tank (18) into the machine, then through
the hoses into the external application.
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Then start the temperature control device and fill in thermal fluid as required.
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The filling process / air purging process is finished when the fluid level is stable
and the bath is filled sufficiently. Fill only half of the sight glass with thermal
fluid. Start temperature control and fill in thermal fluid as required.
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Note the volume change of the thermal fluid (especially with oils) in connection
with the operating temperature. At the lowest temperature required, the fluid
must be above the
minimum
mark in the sight glass, and it must not overflow at
the highest temperature required. In case of over filling, drain off the excess fluid
into a suitable container via the expansion tank drain (8) or machine drain
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With the help of the bypass on the machine top, set the permissable pressure
that your application can carry (dir). the pressure is displayed on the
manometer.
