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TIP
Assembly, installation and operating instructions
2.3
Risk from electrocution!
8
WARNING!
Respect the maximum flow temperatures to protect the EC fan!
Prolonged downtimes can lead to impermissible heating of the EC fan motor if heating media temperatures
are too high. The flow temperatures should therefore be limited depending on the application and the mo-
tor model.
If a temperature limitation is impossible or inappropriate for the purpose concerned, there is also the option
of using suitable valves (thermoelectric, motorised or solenoid) to shut off the heating medium.
This interrupts the flow of heating medium before the EC fan is switched off and the heat exchanger cools
down. Appropriate speed controllers with a fan delay shut-off relay and connection terminals for the motor-
ised valve are available on request.
IMPORTANT NOTE!
Warning of misuse!
In the event of misuse, as itemised below, there is a danger of limited or failing operation of the unit. En-
sure that the airflow can circulate freely.
Never operate the unit in humid areas, such as swimming pools, wet areas etc.
Never operate the unit in rooms with an explosive atmosphere.
Never operate the unit in aggressive or corrosive atmospheres (e.g. sea air).
Never operate the unit above electrical equipment (such as switch cabinets, computers or other electrical
units, or contacts that are not drip-proof).
Never use the unit as a construction site heater.
Never operate the unit in areas with a high dust content.
DANGER!
Risk of fatal injury from electrocution!
Contact with live parts will lead to fatal injury from electrocution. Damage to the insulation or individual
components can lead to a fatal injury.
Only permit qualified electricians to work on the electrical system.
Immediately disconnect the system from the power supply and repair it in the event of damage to the in-
sulation.
Keep live parts away from moisture. This can cause a short circuit.
Properly earth the unit.
DANGER!
Risk of fatal injury from electrocution!
Where multiple EC fans are connected in parallel, an electrical charge (>50 C) is present between line
conductor and protective earth conductor when the power is switched off. Before working on the elec-
trical connection, short-circuit the network connections and PE!
The terminals and connectors are still energised even when the unit is switched off. Use a two-pole
voltage tester to establish that the unit has been de-energised. Only open the unit 5 minutes after all
poles of the voltage have been switched off.
The protective earth carries high leakage currents (depending on the frequency, intermediate voltage and
motor capacity). Therefore, check EN-compliant earthing under test conditions (EN 50178, art. 5.2.11).
Without earthing, hazardous voltages can occur on the motor housing. In case of a fault, electrical
voltage will be present on the rotor and impeller. Rotor and impeller are base-insulated. Do not touch!
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