21
09
21
AIR HEATER
WD-A, WD-U
Maintenance
9. Maintenance
09.01 Warranty
Our warranty is void if damage is caused by improper handling, operation and maintenance. Experience has shown that
improper or inadequate maintenance causes greater damage as the products age.
Consumable and wear parts are generally excluded from the warranty. Warranty claims are only possible within the
applicable periods (see General Terms and Conditions).
The legislator clearly specifies annual maintenance intervals for safety equipment, e.g. Ordinance on Workplaces § 4.
The installation, maintenance, repair and inspection of safety equipment may only be carried out by qualified person-
nel. The personnel is obliged to comply with the general accident prevention regulations (e.g. UVV in Germany) and to
wear the necessary personal protective equipment. Before starting work, the unit must be de-energised and must be
secured against being switched on again.
They should have a sufficient level of knowledge/training on the following points:
•
Compliance with country-specific laws, standards, regulations and directives.
•
Compliance with safety and accident prevention regulations
•
Wearing the necessary personal protective equipment
•
If the hygiene requirements VDI6022 must be complied with. Need training for maintenance and servicing
work in accordance with category B or C as per VDI6022.
09.02 Motor
The motor is maintenance-free. Remove dust deposits from time to time.
Attention!
All work on electrical connections and wiring must be carried out by a qualified electrician. The applicable
standards must be observed.
Any work is prohibited as long as the system has not been disconnected from the electrical power supply and secured
against being switched on again (repair switch can be shut off). EC motors may still have a residual voltage after the
power supply has been disconnected.
09.03 Heat exchanger
Blow out the heat exchanger with compressed air as required or clean off oily dust deposits with a light, oil-soluble
cleaning agent. In case of stubborn deposits, use a steam jet.
Caution!
Use low pressure and keep a distance of at least 300 mm between the nozzle and the heat exchanger.
The unit must be switched off and secured against being switched on again (repair switch can be shut off). The heat
exchanger may only be cleaned when cold, otherwise there is a risk of burns from hot surfaces and damage to the heat
exchanger.
09.04 Air filter
Caution!
Filter dusts can cause allergic reactions to skin, eyes or respiratory organs on contact. Maintenance and
changing of the air filters may only be carried out by qualified personnel. Qualified personnel are obliged to comply
with the general accident prevention regulations (UVV) and to wear the necessary personal protective equipment, e.g.
breathing mask, protective goggles, protective clothing.
The unit must be switched off and secured against being switched on again (repair switch can be shut off). If the bag
filter is dirty, remove it from the filter section and replace it.