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Wiring
Wiring of Motors
To ensure correct operation of the air-handling unit, the motors must be connected so that they will rotate in the
correct directions.
The motors are equipped with thermo-contacts which protect them against overheating. The thermo-contacts must be
connected as shown in the wiring diagram.
The fan built-in assembly can be equipped with a service switch. The service switch is delivered as an optional accessory
separately, not installed on the unit. The service switch connection must be performed in accordance with the directives
and standards of the country of installation, and in accordance with the Installation and Operating Instructions.
The fan assemblies of some dimensional ranges (74, 84, 94) are equipped with two independent fans. The fan motors
must be connected separately. 2 frequency inverters are delivered to control these fans.
Single-Speed Motors – Wiring Diagrams
Rated voltage and wiring for motors up to 3 kW,
including: 230 VD / 400 VY
Rated voltage and wiring for motors above 3 kW:
400 VD / 690 VY
Two-Speed Motors – Wiring Diagrams
6/4 pole motors – two separate windings Y/Y (output,
respectively speed ratio 2:3)
Speed 1:
1000 rpm
Speed 2:
1500 rpm
12
Air Handling Units
Two-Speed Motors – Wiring Diagrams
8/4 pole motors –Dahlander D/YY
(output, respectively speed ratio 1:2)
Speed 1:
750 rpm
Speed 2:
1500 rpm
Electric Heaters
The electric heater connection must be performed fol-
lowing the instructions included in the enclosed documen-
tation, the wiring diagram.
Rotary Heat Exchangers
The rotary heat exchanger is equipped with a single-speed
motor. The connection must be performed following the
chapter Wiring of Motors (see above).
Additional Electrical Equipment
Additional electrical equipment, which is not specified in
this manual, must be connected in accordance with the
applicable documentation, a wiring diagram, which is inclu-
ded in the equipment delivery.
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