0. Preface to the operating instructions
These operating instructions are intended to familiarise users with series VRR fans so that they will be able to use them
in accordance with their conditions of use.
These instructions contain important information relating to the safe, appropriate and cost-effective operation of these
fans. Compliance with such instructions helps to avoid danger and to reduce repair costs and downtimes.
These operating instructions should be permanently available wherever the fan is installed. They must be read and
observed by all persons involved with transportation, installation and start-up as well as with maintenance and repairs.
In addition to the present operating instructions and legally binding accident-prevention regulations, the generally
recognised technical rules and regulations pertaining to safe and competent execution of the work must be observed.
For radial fans with an
EC motor
, there are additional instructions to those given here that apply to commissioning.
1. Basic safety instructions
1.1 Warning symbols
Information regarding cost-effective use of the fan
Details of do's and don'ts to prevent personal injuries and/or material damage
1.2 Conditions of use
The fans have been built according standard practices and recognised safety standards. Nevertheless, their operation
may cause safety hazards or have an adverse effect on other machinery or other material assets. Therefore, it is
extremely important that the conditions of use are observed and that the fan is in perfect working order.
The owner/user must comply with the conditions given below. The conditions stated in the manufacturer's brochure valid
at the time the contract was concluded shall apply, unless specified otherwise by contractual agreements.
a. Requirements with respect to the conveying medium and the surroundings
Compliance with the permissible temperature range, which depends on the type of fan, the operating speed and
the construction materials
The chemical resistance of the construction materials (particularly plastics) to the conveying medium must be
tested
.For explosion-proof fans, the ignition temperature and the explosion hazard zone must be taken into account.
---> Section 6 "Additional information for explosion-proof fans"
The density of the conveying medium must correspond to that of pure air. The medium must not contain foreign
particles and has to be practically dustless. Higher dust loads or impure gases with a tendency to produce deposits
may cause damage.
Condensate accumulating in the housing must be able to drain freely.
The fan must be installed so that it is free of shocks and vibrations (mount on vibration isolators) and must not be
subjected to external mechanical loads.
The compatibility of the fan with its surroundings must be checked. This applies, in particular, to the temperature,
the chemical resistance and the explosion risk.
b. Requirements with respect to the mode of operation
The fan must be operated at the speed (RPM or speed range) specified by the manufacturer.
Parallel connection is permissible.
Roof fans VRR can also be operated outside their characteristic range; however, this should be avoided to
conserve energy.
The technical conditions for electrical connection of the motor must be observed.
Setting and control of the fan speed is only possible for the fan models and control units specified by the
manufacturer.
Non-compliance with the specified requirements constitutes a violation of the conditions of use. The manufacturer is not
liable for damages resulting from such non-compliance.
1.3 Organisational measures
All work with the fan must be carried out by appropriately instructed and reliable personnel.
All work on electrical equipment (motors, control and regulating devices) must be carried out by qualified personnel
(in compliance with DIN VDE 0105 or IEC 364)
Repairs of explosion-proof fans must be carried out by the manufacturer or in consultation with the manufacturer.
Maintenance intervals are to be specified by the owner/user, in consultation with the manufacturer, if necessary. In
the event of any safety-related disturbances (e.g. fan runs unevenly, abnormal noises, visible external damage and
defects), the fan must be taken out of operation and repaired.
All repairs must be carried out with original spare parts. This also concerns the drive motor whose thermal behavior
must be compatible with the plastic materials.
Modifications of the fan that affect the safety are not permitted.
The fan may only be operated if it is in a safe condition. This means that all protective and safety systems (e.g.
electrical motor protection, safety screen) are in place and fully functional and that the fan is integrated into the
system as specified in the project.
02
MIETZSCH GmbH Lufttechnik Dresden
s
www.mietzsch.de
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oi_vrr (11/09)
