KA IMO 2021 6 V2.1

systemair 31
Caution
Hygienic inspection is organized according to hygienic requirements.
Cleaning the unit with cleaning agent always includes rinsing with water, drying and if necessary,
disinfection.
Inspection and cleaning of the component with added water droplet eliminator also includes inspection
and cleaning of eliminator.
3.3 Fan
Caution
See also section 3.1 General instructions.
3.3.1 Electric motor connection and frequency converter set-up
Caution
The motor and frequency converter are factory set.
• PriortoCommissioning,checkthecongruenceoftheconnectionparametersasstatedontheelectricalconsumer
nameplates or in the electrical diagram posted in the air handling unit control cabinet with the parameters of the
mains power supply installation.
• Electricmotorconnectionmayonlybecarriedoutbyaqualiedprofessionalinaccordancewiththeapplicable
technical regulations and standards and with the electrical installation design documents for the site where the
air handling unit comprising the fan section is to be installed, as well as with the electric motor manufacturer’s
instructions. Electric motors must be grounded.
• Ifafansectionwithinanairhandlingunitisnotttedwitharepairswitch,connecttheelectricmotortothemains
supply via a device that allows the isolation of all the poles from the mains supply, with a clearance of 3 mm
between the contacts in the open state.
• Integrate an automatic switch (contactor) and thermal guard in the electric motor energising circuit.
• Electricmotorsupto7.5kWmaybestarteddirectly–theirwiringisindicatedonthemotornameplate.
• In cases of electric motors of higher powers, apply a star-delta starting circuit: from the standstill up to nearly
nominalrotatingspeed,themotorisdriveninthestarconguration,thenitisswitchedtothedeltaconguration.
• Forstartingdualspeedelectricmotors,applyacombinedY/YY(Dahlander)oraY/Yconguration.
• Electricmotorsmustbettedwiththermalguard,whichistobeselectedbytakingintoaccountthenominalcurrent
and which must protect the motor against current overloading and the resulting overheating.
Motor connection
• Step 1: First, connect the grounding cable
• Step 2: Connect the wires with staples in a star or delta connection. See the nameplate for more information.
• Useascreened/armouredmotorcabletocomplywithEMCemissionspecications(orinstallthecableinmetal
conduit).
• Keepthemotorcableasshortaspossibletoreducethenoiselevelandleakagecurrents.
Caution
All types of standard three-phase asynchronous motors can be connected to a frequency converter.