IMO DVV

Electrical connection
DVV 16.08.2021 9
6.2 Preconditions for installation
 DVV fans must be installed on roofs, outside fire zone (DVV/F for exhausting from fire zone).
 The fans must be mounted on a flat, horizontal roof base (<10 mm/m) with height of min. 250 mm over the roof
top (motor shaft vertical). The base shall be accordingly designed (load capacity, stiffness, insulation), if not proved
Systemair accessories used. Extremely wind or turbulence exposed places should be avoided in order to prevent
any water droplets ingress under extreme weather conditions.
 During installation the site must be protected from dust, moisture and weather influences.
6.3 Installation
 Ensure secure access to the fan for maintenance and service.
 Installation examples up to Appendix 2. Installation faults see Appendix 3.
 Fit the contact surface between base plate and roof base with temperature resistant sealing tape for DVV/F or
foam sealing tape for DVV/120, DVV-T. Systemair roof bases (for smoke extract fans marked with /F) are delivered
with appropriate sealing tape.
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 casing at installation.
 The fans shall be fixed to the base with 4 screws in the corners.
 Ensure unobstructed and uniform intake into the fan as well as free outlet.
 Install connecting ducts and accessories. The suction side of the fan is provided with a connection for flange-type
mounting of the air duct according EUROVENT, dimensions see Appendix 1 or www.systemair.com.
 Provide for 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 on the roof base.
NOTE
It is recommended to install a flexible connection between the fan and duct to avoid eventual tensions or
distortions of the base plate (for F400 and F600 only: appropriate flexible connection should take eventual
thermal extension of connecting parts. Flexible connection shall comply temperature/time class of the fan
(400°C/2h respectively 600°C/2h); also as certified Systemair accessory available).
NOTE
It is recommended to keep sufficient ventilation rate to avoid condensation in cold corners of the roof
base under certain weather conditions or to insulate any heat bridge in case of low ventilated buildings.
NOTE
Data of accessories are on-line available - www.systemair.com.
7 Electrical connection
The wiring diagram is placed inside the cover of service switch (also in the test protocol). The quality and installation
of cables for electrical connection must ensure uninterrupted energy supply, even in case of fire. Inside fire zone use