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5
Differential pressure
monitoring
The product can be delivered with tubes for monitoring of the
differential pressure between the fan nozzle and the ventilat-
ed area. The K factor for differential pressure
montoring is presented in the table below�
For more information, speak to your local Systemair office.
Product name
Size
Impeller F400
315, 355
DVG
400, 450
500, 560
630
710
800
Calculate the airflow as follows:
dp = p2-p1
Air volume = k*SQRT(dp) in m3/h
Note:
The measured pressure difference may be influenced by
used accessories and duct� The K -factor is usable over
50% max. airflow each fan size.
6
Electrical connection
6.1
To do before the electrical
connection
• Make sure that the electrical connection agrees with the
product specification on the product name plate.
• Make sure that the environment for electrical connection
is clean and dry�
• Make sure that the wiring diagram that is included with
the supply of the product agrees with the terminals in the
connection box�
Warning
The installation of cables must ensure
uninterupted power supply in case of fire
or extreme heat� Use cable protection
made of temperature resistant material if
neccessary� Do not run any cables on
the fan casing as the fan casing will have
high temperature during smoke or heat
extraction�
6.2
To connect the product to the
power supply
• Complete the electrical connection for the motor� Refer
to the motor wiring diagram that is included with the
product�
• Make sure that the cross section of the protective
• Install a circuit breaker in the permanent electrical
• If a residual current device (RCD) is installed, make sure
K -factor
• If there is a risk that the service switch is accidentally set
135
220
• service switch includes NO-COM-NC contacts for switch
330
485
6.3
550
830
Note:
The speed controller alternatives are different for different
motor types� Make sure that your motor is compatible with
the speed controller type before you use it�
The speed can be controlled with a frequency converter if the
installed frequency converter has built in all-pole sine filter
and shielded cables are not needed�
6.4
• Motors have serial built-in PTC� More than two PTC
• Maximum check voltage of PTC is 2,5 V (to reduce
• Motor protection must be provided by the installer�
7
The commissioning report is found at www�systemair�com�
7.1
• Make sure that the installation and electrical connection
earthing is equal to or larger than the cross section of
the phase conductor�
installation, with a contact opening of a minimum 3 mm
at each pole�
that it is an all-current sensitive RCD� Consider if the
product has a frequency converter, uninterruptible power
supply (UPS), or an EC motor� EC motors have a
leakage current to earth that is <=3�5 mA�
to OFF, lock the service switch� To lock the service
switch, drill a hole into the handle in the ON position and
put a padlock in the hole� The lock makes sure that the
fan operates if there is a fire.
position feedback for surveillance system
Speed controller for AC
motors
Motor protection for AC
motors
chains may not be switched in series, as this can lead to
undefined cut-outs.
influence on the result of measurement).
Commissioning
Caution
• If strong vibrations occur during
commissioning, immediately increase
or decrease the fan speed until the
vibrations are decreased� Continuous
strong vibrations can cause damage
to components�
• Do not increase the fan speed to a
higher rpm value than the maximum
value that is given on the name plate�
To do before the
commissioning
are correctly done�
7
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