Dustcontrol 14123x, Original Instructions Manual

Page: 27 / 115

Part No 94123-B DC 11-Module - 27
Service points
1. Lubrication of lower bearing P and S models (always)
2. Lubrication and review of vacuum valve (always)
(not fi tted to S models)
3. Filter change (fi ne fi lter, always)
4. Micro fi lter (optional)
Test running
Th e unit is normally adjusted to a nominal pressure.
Th e pressure can be changed by adjusting the vacuum
relief valve. Please note that it cannot be exceed the max
pressure for the unit. For the 7.5 kW DC 11-Module
the pressure can be adjusted over the stated max pres-
sure 19 kPa, up to 23 kPa, under the condition that
the highest rpm, level 3 (70 Hz) is blocked.
1. Verify that the power is locked out.
2. Check that no persons can be injured if the pump
starts and that all outlets are closed.
3. Connect a manometer for the negative pressure
calibrated to –50 kPa to the suction side as close
to the pump as possible.
4. Power up the pump and listen carefully for the
following sounds: A high-pitched whine is normal
from the impeller blades. As the pump draws
cooling air through the vacuum relief valve a
weak hissing should be heard. Check the rotation
direction of the pump.
5. Measure the pressure. Compare with the dimension
point. Th e pressure can be adjusted by adjustment
of the vacuum relief valve, see page 27.
6. Check the function and tightness of the connected
exhaust system.
7. It is normal that the pump gets hot during
operation
8. When the fi lter is being cleaned, a number of
powerful air pulses should be heard over a four
minute period with approx. 20 seconds interval
Service
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