Operation; Servicing And Maintenance; Cleaning; Information - Fault Causes - Helios VDD T120 Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
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WARNING
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CHAPTER 4
SERVICING AND
MAINTENANCE
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ATTENTION
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VDD.. – Roof Fans
– Check the waterproofing of the connection cable and tight clamping of the strands.
– 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.
3.5

Operation

m WARNING
Risk of burns!
The high temperatures at the fan housing can lead to severe burns.
Wear suitable protective gloves!
Regularly check the proper functioning of the fan:
– Free movement of the impeller
– Power consumption in the range of the type plate data
– Check any vibrations and noises
– Formation of dust or dirt deposits 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.
4.0

Servicing and maintenance

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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!
m WARNING
Risk of burns!
The high temperatures at the fan housing can lead to severe burns.
Wear suitable protective gloves!
– 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, 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!
• Housing/impeller surface coatings (e.g. rust, paint defects)
• Free movement of the impeller
• Bearing noises
• Oscillations, vibrations
• Current consumption according to type plate
• Functionality of safety components (e.g. motor protection switch)
• Damage to isolator switch
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.
4.1

Cleaning

m 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!
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