Connection To Power Mains - Vents PA W Series User's Operation Manual

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SAFETY PRECAUTIONS:
Mount the unit on a rigid and stable structure.
Use bolts to suspend the unit to the ceiling. Make sure that the construction has sufficient load
capacity to carry the unit weight. Otherwise reinforce an installation place by beams etc. After that
fix the bolts.
If the construction strength or surface is not rigid enough it can resonate with the unit and create
abnormal noise and vibration. While mounting the unit provide enough service space and an access
door in the ceiling for inspection and maintenance of the filters, heat exchanger and fans.
One access door is required for each unit. For details, refer the outline drawing, fig. 1.
If the bolts used for the unit suspension to the ceiling are too short, the unit may generate
abnormal noise and resonate with the ceiling.
Use longer bolts with to prevent resonance. If the connection point to the spiral seam duct is
supposed to be the source of the abnormal noise, install a flexible air duct instead of the flexible one.
For the better effect you may use the flexible anti-vibration connectors.

CONNECTION TO POWER MAINS

Disconnect the unit from power mains prior to any wireworks. Connection of the unit
to power mains is allowed by a qualified electrician with a work permit for the electric
units up to 1000 V after detailed study of the present user's manual. The rated electrical
parameters of the unit are shown on the sticker. Any internal connection modifications
are not allowed and void warranty.
The unit is rated for connection to three-phase ac 400 V / 50 Hz.
Connect the unit to power supply by means of insulated, durable and thermal-resistant cords
(cables, wires) with respective cross section, in any case no less 4 mm
However, the given section value is tentative.
The choice of the required wire section in each case shall be based on the wire type, its maximum
permissible heating temperature, its insulation, length and installation method.
Use copper wires only.
Connect the unit to power supply through the external automatic thermal-magnetic circuit
breaker integrated into the power mains.
The trip current must be somewhat above the current consumption, refer table 2.
Connect the fan motor to power mains through the terminal block X1 located on the unit side
wall in compliance with wiring diagram and terminal designation.
Fig. 4 shows the wiring diagram for connection of the fan motor to three-phase power mains.
The terminal designations are shown on the sticker inside the terminal box.
To connect the unit to power mains route the cables through the screwed cable gland located on
the terminal block side to preserve the ingress protection rating.
Install an external automatic thermal-magnetic circuit breaker on the external input (400 V / 50
Hz) to enable breaking of all the mains phases.
Easy access to the external circuit breaker QF should be provided for the emergency power cutoff
of the unit.
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