8
Portable radial fans
WPA-P-N
27.09.2016
5. Structure and Function
The fan consists of a steel spiral housing and a motor and a radial impeller which is directly
mounted on the motor shaft (direct drive). The inlet and outlet are adapted for connection
of the flexible hoses, which are clamped with hose clamps.
For safety reasons, the inlet and outlet are equipped with a protective grill.
The impeller with profiled radial blades provides low acoustic pressure of the fan.
As standard, the fan is equipped with a motor protective switch. Each fan is energized
through a five metre long power supply cable with a plug.
6. Assembly and Start-up
The portable WPA-P-N fans can work in closed rooms (indoor application) and outside the
buildings. In case of outdoor application (especially for a longer time of operation) it is
important to protect the device against atmospheric factors.
The appliance do not require special preparation before start-up. Depending on the purpose
of application, it is important to provide suitable hoses (see Section 7 of the present Use and
Maintenance Manual) .
The device is energised through a motor protective switch (or by a motor starter).
Appropriate connection diagrams are shown in Fig. No.3.
Prior to the start-up, check the connection between the motor and the PE protective cable,
and the correctness of the electrical connections (
the impeller rotation sense ought to
be according to the arrow on the housing, if this is the opposite, change the phase
connection sequence
).
own. It is important to select the right type and section of the supply cable, and choose
the appropriate short-circuit- and overload protection, according to the local conditions.
Approaching with loose clothes or putting the hand near the open inlet
of the running fan can cause hazard of accident. Do not look into the working fan as
this could cause the face injury of User.
In case of any activities carried out on the fan, it is important to disconnect the device
from the power supply system.