5
housing are ready wired before the fans are
dispatched.
•
The supply to the fan terminal box must be laid be-
tween liner and roof mount and sealed at the wall
penetration by means of a heavy-gauge moisture-proof
union.
6. Drive
•
As standard, the centrifugal roof fans are driven by three-
phase a.c. motors to IEC recommendation, type of
enclosure IP54 or EExe, design B5.
If required, motors for other voltages and frequencies,
pole-reversing or also variable-speed motors are used.
•
The centrifugal roof fans are in principle supplied with
the drive motor fitted. The test run after final installation
confirms the performance and operational safety of the
fan.
•
If the motor is installed by the customer, the manu-
facturer’s product liability does not apply.
7. Installation of the motors
•
When installing the electrical wiring for the motors and
any necessary switchgear, the VDE (German electrical
engineers’ association) regulations and the motor
manufacturer’s instructions must be observed.
•
The installation is made according to the wiring diagram
contained in the terminal box and must only be carried
out by appropriately qualified technical personnel.
Check voltage, rpm and direction of rotation. Direction
of rotation of the motor must conform to the rotation
symbol on the fan enclosure.
•
When using pole-reversing motors, a further change
from high to low speed must be provided. The delayed
switching must be bumpless.
•
A motor protection facility must be provided on principle.
If the fans are installed in positions where the temperature
of the cooling air exceeds 40
o
C, a performance reduction
of the motors must be taken into account. Values are
shown in the catalogues of the motor manufacturers.
8. Commissioning
Commissioning and operation of the fans must only be
carried out by appropriately trained persons who are familiar
with the applicable operating and safety regulations. After
installation of the fan and connection of the suction-side duct
system as in Item 5, the following must be checked or carried
out:
•
All visible screw connections must be checked for
tightness.
•
Protective devices must be checked for proper attach-
ment (casing splinter protection, with open-inlet fans
intake protection grille).
•
Check motor venting hoses and the condensate drain
bore in the housing base for clear passage.
•
Foreign bodies (forgotten tools or installation material
etc.) must be removed from the internal spaces of the
fan and from the upstream ducts and assemblies.
•
All possibly existing regulating elements (gate valves,
butterfly valves) must be sufficiently closed before
starting so that only approx. 10% of the cross-section
remains open.
When starting the fan, proceed as follows:
•
Expel unauthorized personnel from the fan area!
•
Switch on the main switch and the motor switch (note
permissible motor starting frequency).
•
After nominal speed has been reached, open any control
elements until the required working point establishes
itself.
After starting, pay special attention to:
•
Power input of the motor
•
Quiet running of the fan.
After 12 hours of operation, check all visible screw
connections for firm seating and retighten if necessary.
Issued: PA S
Operating manual No. 28.95.103
Valid from: Serial No. 29956
Date: 01.03.2001
Plastic Radial Roof Mounted Fans
SDR 63 Sizes 355-710