ZIEHL-ABEGG MAXvent FV31 Series, Assembly Instructions Manual, Page: 25 / 32

Type of error Possible cause Adjustment
Airways blocked Check for free air passages (supply/exhaust air vents,
fi lters)
see "Impeller blocked or dirty"
Pressure loss different to
planned Check fan selection
Vibrations Imbalance Check wings/blades for damage, soiling or ice
see "Impeller blocked or dirty"
Unusual noises Ball bearing damaged /
worn Replacement of the ball bearing by ZIEHL-ABEGG re-
quired
Impeller / blade scrapes /
brushes When indicated, clear foreign bodies/dirt from the fan
see "Impeller blocked or dirty"
Operation beyond stall
point Check for free air passages (supply/exhaust air vents,
fi lters)
Fan turns in wrong direction --> See this fault type
In one-speed motor:
Circuit wrong: D instead of
Y Connect to suit voltage according to rating plate
8 Service work
8.1 Repairs / maintenance
Attention!
•
After removal of the motor and/or impeller, the fan must be balanced again! To do so,
please contact your manufacturer.
•
In the case of complete dismantling and reinstallation of the fan, checking must be
carried out before start-up (see start-up).
•
Please read the Safety instructions chapter before working on the fan!
•
Before working on the fan, this must be disconnected from the power supply
and secured against switching back on!
•
No maintenance work at running fan!
•
When operating by means of frequency converter, ensure that the waiting time is
maintained after safety disconnection - see manufacturer
´ s operating instructions
regarding capacitor discharge time.
•
Allow maintenance work to be carried out by trained specialists only.
•
Any faults detected in the electric system/modules/operating equipment must be
corrected immediately. If these faults are not corrected, the device/system is
potentially very dangerous. The device/system must therefore not be operated when it
is faulty.
•
Wear safety clothing / shoes and cut-resistant safety gloves when handling.
•
Please observe the safety regulations and the worker ´ s protection rules by all
maintenance and service work (EN 50 110, IEC 364).
Assembly instructions MAXvent Service work
L-BAL-F054-GB 2018 Index 005 Part.-No. 00501414-GB
25/32