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04.06.2019
explosion-proof roof fan
WPA-D-N/Ex
5.
Structure and Function
The fan consists of a spiral steel housing, Ex motor, aluminium radial impeller (directly instal-
led on the motor shaft) and a steel sheet motor hood. The impeller blades feature a shape
of an aeroplane wing and they provide low noise level. The fan inlet is equipped with a flange
to install the fan on a roof base or on a wall bracket.
Typical feature of the fan is the silencer, fastened at the outlet of the spiral housing.
For safety reasons, both inlet and outlet are equipped with a protective grill. It is recommended
to install the TK silencers at the fan inlet (see acoustic data in Table No.1).
ADDITIONAL EQUIPMENT
– delivered on separate order:
■ roof bases or wall brackets
■ silencers
The fan housing is equipped with a protective cable to dissipate the electrostatic charges away.
There is a terminal for the protective cable on the motor housing. Additionally, there is located
a terminal box for supply. Hemispheric motor hood is of aluminium sheet and protects from at-
mospheric factors / weather conditions.
6.
Assembly and Start-up
The appliance can work outside the industrial rooms (outdoor application). Manufacturer sug-
gests installing the fan on the roof base or on a wall bracket (as an element of optional equip-
ment constructed upon separate documentation).
The inlet- and outlet connection fitting pieces ought to be fastened to the ventilation system
by means of flexible connectors
(of antistatic material)
. The way of fastening of the connections
depends on the established technologies of the system execution and should be specified at
the site of installing.
User performing the assembly is strictly responsible for full compli-
ance with the provisions of EN ISO 13857
.
6.1. Guidelines of installing:
a/
VENTILATION SYSTEM
– to which the WPA-D-N/Ex fan will be connected,
must be designed and executed in accordance with the valid regulations and
standards
– according to the local conditions of explosion risk.
b/
SUPPLY SYSTEM - to which the WPA-D-N/Ex fan shall be connected must be
designed and executed in accordance with the valid regulations and standards
– according to the local conditions of explosion risk.
–
Prior to connection, make sure if the parameters of the hitherto existing electrical supply sys-
tem, are in accordance with the parameters on the nominal plate. Otherwise, the connection
steps cannot be executed.
–
Any steps of connection activity can be carried out by an authorised person with qualification
– according to the valid regulations and standards.
–
The whole ventilation system must have the efficient performed installation dissipating the
electrostatic charges. Any joints / connections between ventilation sections should have
electrostatic connections made of protective cable.
–
Check if the metal ducts are grounded correctly. Additionally, provide the grounding to the
motor housing, by joining the protective cable with the contact on the motor housing.
