NA 03.28 D
EN - 14
Dual-speed motors: two separate windings, 2 x 3 terminals.
These diagrams apply to three-phase, 1500/1000 rpm motors.
Low speed
(LS)
High Speed
(HS)
LS and HS for “2” contacts
These wiring diagrams are inside each terminal box.
Retighten the connections after 48 hours of operation.
Frequency inverters
Recommendations:
The motor must be connected to the inverter using a shielded cable;
The sizing of the inverter depends on the distance between the motor and the inverter;
Before starting up the system, the upper frequency must be limited to prevent the maximum speed of the rotating parts from
being exceeded or the motor from being overloaded;
Eliminate the frequencies producing resonances by checking the operation of the fan one frequency at a time.
Fit Du/Dt filters on the inverter side for the 690V networks.
4.2 Blade damper
Do not turn on the fan with the blades closed.
When the unit is shut down, ensure a time delay on the dampers (or a leakage rate) equal to the fan's inertia time or the time required
for the heat to be evacuated from the electric heater.
4.3 Electric heater
Never operate the coil with the fan off.
Always install a fan delay.
4.4 Water humidifier
Check the direction of rotation of the pump.
Refer to the documentation delivered with the pump.
5. MAINTENANCE
5.1 Casing
The boxes have smooth internal walls. The rate of cleaning will depend on the application and outdoor environment. Check the casing
at least once a year.
Do not clean the air handling unit with a high-pressure washer.
5.2 Dampers
Periodically check the condition and operation of the dampers.
