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Installation and Operating Instructions
EN
ATTENTION
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WARNING
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CHAPTER 4
SERVICE AND MAIN-
TENANCE
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Roof fans – RD/VD EC
Never lay cables over sharp edges!
3�7 Commissioning
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The rotating impeller can crush fingers�
Ensure protection against contact before commissioning!
The following inspection work must be carried out or tested before the initial commissioning:
– Check designated use of the fan
– Check permissible air flow temperature
– Compare mains voltage to rating plate data
– Check fan for professional electrical installation
– Check protective conductor connection
– If required the potentiometer can be adjusted alternativley connect to external controller.
– Remove assembly residues from the fan or duct
– Check all parts for tightness, particularly screws, nuts, protection guards. Do not loosen screws in the process!
– Check fan for solid mounting! The terminal box / isolator switch and motor impeller unit must be freely accessible.
– Ensure that the suction and outlet areas cannot be accessed by unauthorised persons.
– Check tightness of all connections (if necessary).
– Check free movement and direction of rotation of impeller by briefly switching on. Wear protective glasses when
checking.
– Compare power consumption to rating plate data.
– Check fan for vibration and noise during test run. In case of excessive vibration and/or noise, it can be assumed that
the fan is operating outside of its operating range. In this case, contact the manufacturer by all means!
– Check sealing of connection cable in the terminal box and fixed clamping of wires.
– Do not operate fan outside of specified characteristic curve (see catalogue / internet) . The fan must run at its spe-
cified operating point.
– In order to ensure sufficient motor cooling, a minimum speed/voltage, which also depends on on-site resistances,
wind pressure, etc., must be observed for voltage controlling through phase control. It must be selected so that a
safe, jolt-free start-up and operation are ensured.
3�8 Operation
Regularly check the proper functioning of the fan:
– Unhindered running of the impeller
– Power consumption in the range specified on the type plate
– Check any vibrations and noises
– Deposits of dust and dirt in the casing or on the motor and impeller
– In case of problems with one of the aforementioned points, maintenance must be carried out according to the inst-
ructions in CHAPTER 4.
4�1 Service and maintenance
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Before any maintenance and installation work or before opening the cover, the unit must be fully isolated from
the power supply and secured against switching on again!
– In principle, the units are maintenance-free. However, all necessary maintenance work must be carried out by qualif-
ied electricians, cf. section 1.7!
– Excessive deposits of dirt, dust, grease, etc. on the impeller, motor, protection guard and, above all, between the
casing and the impeller, are not permitted, as these can lead to an unbalance in the impeller, overheating of the
motor or the blocking of the impeller. In such cases, the unit must be cleaned, see section 4.2 Cleaning.
– If the fan has an important supply function, irregular performance-related maintenance is necessary. In cases of
longer periods of standstill, maintenance must be carried out when the unit is restarted.
– The following must be checked:
• Secure mounting of the fan
• Dirt deposits
• Damage
• Tightness of screw connections, particularly impeller mounting. Do not loosen screws in the process!
• Surfaces (e.g. rust, paint defects)
• Free movement of the impeller
• Bearing noises
• Oscillations, vibrations
• Current consumption according to type plate
• Functionality of safety components
The ball bearings used are maintenance-free under normal operating conditions and they are designed for a service life
of 20,000 hours. Regardless of the operating hours, the ball bearings must be replaced after 5 years at the latest due
to the ageing of the grease for reasons of preventative maintenance.
4�2 Cleaning
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An insulation fault may result in electric shock!
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