IMO BKF

Electrical connection
BKF 16.08.2021 9
6.3 Installation
 Ensure secure access to the fan for maintenance and service.
 Installation up to Appendix 2.
 Fit the contact surface between BKF and flexible connections/duct with temperature resistant sealing tape (not
provided with BKF).
WARNING
Hazard from mechanical distortions!
 Before and after mounting check manually if the impeller rotates smoothly. Install the fan only, if the
minimum air gap between rotor and nozzle matches the value from the test protocol.
 Avoid distortions of the housing at installation.
 The fan shall be fixed with screws (hanging material not provided with BKF).
 Ensure unobstructed and uniform intake into the fan as well as free outlet.
 Install connecting ducts and accessories.
 Provide for inlet/outlet contact/suction protection and safety distances according to EN ISO 13857.
NOTE
In some cases, it is better to mount accessories before placing the fan.
NOTE
It is recommended to install a flexible connection between the fan and duct to avoid eventual tensions or
distortions of the housing (appropriate flexible connection should take eventual thermal extension of con-
necting parts. Flexible connection shall comply temperature/time class of the fan; also as certified Sys-
temair accessory available).
NOTE
Data of accessories are on-line available - www.systemair.com.
7 Electrical connection
The wiring diagram is placed inside the cover of motor connection box (also in the test protocol). The quality and in-
stallation of cables for electrical connection must ensure uninterrupted energy supply, even in case of fire. Inside fire
zone use only certified cable. Connecting possibility see Appendix 3. Electrical data on the fan nameplate must comply
with the provided mains connection. Voltage tolerance according to IEC 38: +6%, -10%. Equivalent motors from differ-
ent suppliers may have slightly different nominal data than in catalogue.
NOTE
 Motors have serial built-in PTC. More than two PTC chains may not be switched in series, as this can
lead to undefined cut-outs.
 Maximum check voltage of PTC is 2,5 V (to reduce influence on the result of measurement).
 The wiring diagram see Appendix 3.
 Motor protection must be provided by the installer.