Freeze-dryer Alpha 1-4 LDplus
Freeze-dryer Alpha 2-4 LDplus
7 Malfunctions and error correction
Version 11/2006, Rev. 2.2 of 17/10/2016 • sb
Translation of the original operating manual
7.1.2.3 Pressure control valve
A malfunction of the pressure control valve may have several causes.
The inspection of the valve must be carried out by qualified specialist
personnel (see chapter 7.3 - "Service contact").
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7.1.2.4 Rubber valves
In order to identify a leaking rubber valve, the valves must be checked
individually:
• Remove the rubber valve and seal the connection at the drying
chamber with a rubber stopper.
• Check the tightness under vacuum until the leaking valve has been
localised.
• Clean the valve or replace it if necessary.
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7.1.2.5 Vacuum sensor
Vacuum sensors have a limited service life and can be ordered as spare
parts (e.g. VCP 63, order no. 312011).
Functional test:
• Connect the vacuum sensor directly to the suction side connector of the
vacuum pump.
If a final pressure of at least 0.011 mbar is reached (with a vacuum pump
that has reached its operating temperature), the sensor and the vacuum
pump are OK.
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7.1.3 Insufficient ice condenser temperature
Ensure sufficient ventilation. Do not place any paper, cloth, or similar
material behind or under the unit, since otherwise the air circulation will be
impaired.
The refrigeration unit is equipped with a protective device against
overpressure in the refrigeration system and with a thermal motor
protection switch.
The protective devices trip
• when the ambient temperature is too high
• when the air circulation of the heat exchanger of the refrigeration
system is insufficient
• when the refrigeration system is overloaded.
In these cases, the refrigeration unit will be switched off automatically. If the
permissible operating conditions are re-established after a cool-down
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