7
RD.. and VD.. – Roof Fans
Installation and Operating Instructions
UK
4.0 Servicing and maintenance
WARNING
The fan must be isolated from the mains power supply and secure against being switched on again before
all cleaning, maintenance and installation work or before opening the terminal compartment!
– In principle, the units are maintenance-free. Nevertheless, all necessary maintenance work must be carried out by
qualified electricians, cf. section 1.6!
– Excessive deposits of dirt, dust, grease, etc. on the impeller, motor, protection guard and, above all, between the
housing 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 4.1 Cleaning.
– If the fan has an important supply function, regular 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!
• Casing/impeller surface coating (e.g. rust, paint defects)
• Free movement of the impeller
• Bearing noises
• Oscillations, vibrations
• Current consumption according to type plate
• Function of safety components (e.g. motor protection switch)
4.1 Cleaning
WARNING
An insulation fault may result in electric shock!
Before cleaning, isolate the fan from the mains power supply and protect against being switching on again!
– The disassembly of the unit or parts of the unit may be necessary for the cleaning.
This must be carried out by suitable specialist personnel cf. section 1.6!
– Clean fan flow area as well as impeller and motor.
– Do not use aggressive cleaning agents that could damage the paintwork!
– High pressure cleaners or water jets are not permitted!
4.2 Information – Fault causes
The safety instructions specified in chapter 1, section 1.2 must be observed!
The elimination of faults must only be carried out by specialist personnel, cf. chapter 1.6!
CHAPTER 4
SERVICING AND
MAINTENANCE
WARNING
WARNING
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nm
Error/Fault
Causes
Solution
Fan does not start
No voltage, phase missing
Check mains voltage
Defective capacitor
Check/replace capacitor
Impeller blocked
Clear blockage, clean, replace impeller if
necessary
Motor blocked
Check motor, replace if necessary
Fuse tripped
Short-circuited coil/ground fault in motor
Replace motor
Supply line/connection damaged
Replace parts, replace motor if necessary
Connected incorrectly
Check connection, change
Residual current device
tripped
Motor insulation damaged
Replace motor
Supply line insulation damaged
Replace supply lines
Motor protection switch
triggered
Tight bearing
Replace bearing
Impeller touching
Clean, replace impeller if necessary
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Contaminated motor
Clean
Vibrations
Contamination
Clean
Bearing damage
Replace bearing
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Attachment-related resonance
Check or repair attachment, use vibration
damper
Incorrect direction of rotation
Check/modify connection
Impeller out of balance
Rebalance by specialist
CAUTION
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