Instructions for unloading on the site as well as installation and connection |
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I.2.10 Risk of stack effect by vertical ducts and wind pressure on louvers
Important
The Systemair air handling units can be ordered and delivered without dampers, and the installer/user must
check that duct systems with the described risk of stack effect (chimney effect) will be provided with
dampers and spring return motors.
On special occasions stack effect – also called chimney effect – in the ducts create airflows that drives the impellers by
turned off motors.
A rotating impeller is a potential hazard during cleaning and maintenance of the unit. Eliminate this airflow by dampers
with spring return motors for automatic closing of the dampers - even by power failure.
I.2.11 Remove transport brackets – when spring mounts are installed
I.2.11.1 Impeller diameters 220 – 560 mm
If the fans are installed on spring mounts the transport brackets must be removed after the installation of the air han-
dling unit. Two transport brackets are fitted to the coil springs during transport and installation. Both transport brackets
must all be removed to give the full anti-vibration function to the coil springs. The transport brackets are made more
visible with yellow labels. After removal of the transport brackets they must be disposed of safely.
I.2.11.2 Impeller diameters 630 – 1.000 mm
If the fans are installed on spring mounts the transport brackets must be removed after the installation of the air han-
dling unit. Four transport brackets are fitted to the coil springs during transport and installation. The four transport
brackets must all be removed to give the full anti-vibration function to the coil springs. The transport brackets are made
more visible with yellow labels, as shown in the picture below. After removal of the transport brackets they must be
disposed of safely.
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