Power Connection - Wolf KG Installation And Maintenance Instructions Manual

Power connection

Electrical connection of
the EC fan
Motor malfunction
Residual current circuit
breaker
22
Power connection
The power connection must only be carried out by trained, qualified electricians to a
standard compliant with the applicable regulations (VDE, local power utility, etc.).
If the intake air / exhaust air fan shuts down or fails, all control valves must
automatically close and the DHW/cold water and scrubber pumps must switch off.
Use only control valves that close when de-energised and antifreeze thermostats without
disabled reset, as otherwise components will continue to operate even if the system
shuts down. Under such circumstances the built-in safety features will not be able to
function as intended (e.g. no assurance of effective frost protection).
Install a lockable repair switch for each drive motor to ensure that the air-handling unit
can be safely shut down.
If an additional protective equipotential bond is necessary due to structural requirements,
this must be manufactured on site. It is the duty of the user or the qualified electrician to
ensure that the appliance is properly earthed in accordance with the applicable national
and local electrical and installation regulations.
Once the power connection has been completed, the installation must be safety-tested
in accordance with VDE 0701 part 1 and VDE 0700 part 500 to check its full working
order and that the safety devices are fully operational.
Use only electric motors designed to drive fans.
It is absolutely essential to wire the motor in accordance with the connection
Note
schematic in the terminal box. A motor that is wired incorrectly will be unable to
develop its rated output and may be destroyed.
Use a PTC thermistor trigger for each motor with PTC thermistor, an interlock contactor
for each motor with thermo contacts and a thermal overcurrent relay for each motor
without PTC thermistor or thermistor contacts.
Use equipotential bonding and earth straps to ensure the protective conductor connection
between the air-handling unit and the ducts and between the heat exchangers and the
pipework installed on site.
EC motors can be operated over the entire speed range with infinite adjustment via
a 0 - 10 signal (DC). The motors are generally equipped with internally switched
temperature controllers. Do not lay the control line of the device directly parallel to the
mains supply cable. Keep them as far apart as possible. Recommendation: Distance:
> 10 cm (separate cable routing)
If the EC fan is only connected to the power supply without connecting an additional
Note
regulation or control device to the control connection of the fan, then a bridge must be
inserted between the connections 0 – 10 V /PVM and +10 V. In this case, the fan runs
at the maximum speed and/or air volume.
To restart the motor, switch the mains voltage off for at least 25 seconds, then switch
it on again.
Only universal current sensitive residual current circuit breakers (type B) are permitted.
We recommend residual current circuit breakers with a trigger threshold of 300 mA.
Voltage is present on terminals and connections even when the device is switched off.
Do not touch the device until at least five minutes have passed since disconnecting the
voltage at all poles. If control voltage is applied or a setpoint speed is stored, the motor
restarts automatically, e.g. after a mains failure.
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