Leser 4401 Instrucciones De Servicio página 8

Operating Instructions
Foreign bodies in the safety valve
EN
Danger from failure of safety valve or leaks
• Flush the system before installation
of a safety valve.
• Check the safety valve for foreign
objects.
• Remove foreign objects
Bug screen is damaged or missing (B
or option)
Dirt, objects or insects get into the safe-
ty valve. Danger from malfunction of
the safety valve.
• Install the bug screen correctly.
• Check the bug screen regularly.
Ambient temperature is too high
Material expansion. Danger from malfunc-
tion of the safety valve.
• If temperatures are above 60 °C, then
configure pressure tapping lines to be as
long as possible and with a water seal
(only C).
• Position the control cabinet and actua-
tors so that they are not subjected to
temperatures higher than 60 °C (only C).
Ambient temperature is too low
Icing, freezing vapours, reduced flow rate
due to congealing media. Danger from
functional disruption of the safety valve.
• Protect safety valve and pipelines from
cold (only C).
• Take the appropriate measures for tem-
peratures below 2 °C (only C).
• Heat the control cabinet and pressure
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tapping lines for temperatures below
2 °C (only C).
Pressure range of the air supply ex-
ceeded or not reached (only C)
Malfunction or supplementary loading.
Danger from functional disruption of the
safety valve.
• Comply with the pressure range of the
air supply:
– Maximum pressure: 10 bar,
– Minimum pressure: 3.5 bar.
Abrasive or corrosive media
Moving parts jam or become stuck. Dan-
ger from functional disruption of the safety
valve.
• Service the safety valve
after each time it opens.
• Use bellows.
• Ensure proper clearance of movable
parts.
Media with high proportion of particles
(only B)
Deposits and clogging. Danger from mal-
function of the safety valve.
• Use a filter with the correct mesh size.
• Use additional filters
to increase the filter capacity.
Residual media in the safety valve
Poisoning, caustic burns and other burns,
injuries
• Wear suitable protective equipment.
• Remove residual media.