44 systemair
3.6 Control damper
Caution
See also section 3.1 General instructions.
For standard item temperature stability check the values below:
• Gear: -15 °C to +80 °C.
• Sealing tape: -20 °C to +70 °C.
Commissioning
Control dampers are mounted on the casing from the outside or from the inside, depending on the project
specications,thecustomer’srequirementsandtheairhandlingunitversion.
• Twoormorecontroldamperscanbelinkedtoacommondrivebymeansofalevermechanism(balljoints,drive
levers and rods).
• Wheninstallingandlinkingthedampers,makesuretoprovidespaceforthemovementofthemotordriveandthe
lever mechanism.
• Priortostartingthesectionup,checkthecorrectopeningandclosingofthedamper,inparticularinthecaseof
dampers with a common drive.
• Beforecommissioningofthefan,checkexternaldampersarefullyopen.
• On the outside, protect the control dampers with ducts or protection mesh if not factory protected.
• Mount and start the motor drive in accordance with the manufacturer’s instructions and electric control cabinet
start-up instructions.
• The required capacity of the motor drive depends on the control damper size and on the pressure differential across
the damper. The required rotating torque is stated in the section technical sizing calculation. For safety factor use a
minimumof20%reserve.
Maintenance
Inthecaseofoutdoor-typeairhandlingunits,inextremeweatherconditions(lowtemperaturescombinedwiththick
fog,wetsnow),theprotectionmeshontheintakeairsuctionsectionmayfreeze.Insuchanevent,cleanthemeshby
mechanical means or defrosting.
Checkthefollowing:
• the condition of the gears and blades,
• the tightness of the threaded joints on ball joints and drive levers,
• whether the damper blades open and close correctly and
• whetherthemotordriveisrmlymounted.
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