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77
Installation instructions for professionals
SAFETY
General information Electrical safety
Always check that the supply voltage to the
equipment is switched off before opening the
service hatch.
Only an authorised electrician may open the
electrical box.
Follow the local regulations on electrical
installations.
In case of a malfunction, always determine the
reason for the malfunction before restarting the
unit.
When you have switched off the power to the
unit, wait for two (2) minutes before starting the
maintenance work. Even though the power is
switched off, the fans continue running and the
post-heating coil remains hot for a while.
Check that the unit is completely isolated from
the mains supply before conducting any voltage
tests, insulation resistance measurements or other
electrical work or measurements. Such work may
damage the sensitive electrical equipment.
Control equipment used in the ventilation units
may cause leakage current. This may affect the
operation of the residual current protection.
All ventilation units containing a control system
must be equipped with an overvoltage protector.
DANGER DANGER
DANGER
WARNING
WARNING CAUTION
CAUTION
CAUTION