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Electrical Details

WARNING - DANGER
This equipment incorporates rotating and moving
parts as well as electrical components and
conductors.
It is the responsibility of the installer to ensure that
any such items remaining externally accessible once
the equipment is installed are adequately guarded.
This precaution is necessary to avoid the possibility
of accidental injury or death.
Particular attention must be paid to the inlet side of
rotating impellers.

Because start and run currents depend upon the duty of
an individual unit and associated system the values quoted
in the table are nominal.
Start currents are peak instantaneous values and are for
DOL starting unless otherwise indicated.
Overloads must be set to the maximum full load current
of the equipment they are protecting. the recommended
overload setting will be found on the rating plate issued
with each unit.

Electrical connections

Basically, the Airmover unit and the speed control, if
included, should be connected to the electrical supply and
to each other in accordance with the wiring diagrams
(page 12 on). Compatible site wiring and provisions of
any start contactors, overloads, etc., are the responsibility
of others. If a single phase Airmover is to be used with a
speed control and the unit is fitted with a permanent
capacitor motor, any link fitted between Airmover
terminals X and L must be removed.
All connections into the fan are to be made as shown in
the wiring diagrams (page 12).
Isolation to be provided by others and in accordance with
electrical regulations.

Testing after installation

Precautions

Prior to testing, make sure that no loose items have been
left in the Airmover. Whenever the unit has to be
switched on with its access panel removed, first check that
all personnel are clear of the open access panel aperture.
Make sure that the external control switch or contactor as
relevant, is switched off,

Testing

Remove the access panel from the Airmover. Switch on
the local isolator (by others).
Run the fan just sufficiently long to ensure that it rotates.
Switch off. During run-down by observation through the
open access panel aperture, check for correct rotation and
for evidence of any malfunctioning as follows:

(a) Check that the impeller is rotating freely and is secure

on the shaft

(b) Check rotation. A single phase unit is unlikely to be

incorrect, as rotation is carefully checked at the
factory. Should a three phase unit be incorrect, reverse
any two of the supply connections in the airmover
isolation box

If a NuAire speed control is fitted, check that it regulates
speed as required (see the remarks in “Operating the
Airmover”).

Removing & Refitting the unit

Isolation

Before commencing, make sure that the unit is externally
isolated from the electrical supply.

Removal

Remove the terminal box cover on the side of the unit and
disconnect the electrical supply leads noting the
connections.
Support the unit and remove all fixing devices.
If silencers are fitted, the unit should be removed
complete with them. Move the unit and the silencers, if
fitted, to the working area.

Re-fitting

Re-fitting is the reverse of removal. Sandwich a gasket
between joint faces. Make sure that the unit is mech-
anically and electrically connected exactly as it was prior to
removal.

Operating the Airmover

The access panel must be firmly fixed to the side of the
unit.
Switch isolation device (by others) to the ON position
If a NuAire speed control is fitted, this can also be used to
switch the airmover OFF and ON. Note that the unit
may not always start from cold at the lowest control
setting, though there is no danger of overheating. It is
therefore recommended that the unit is started at one of
the higher settings. Speed can be changed whilst the unit
is running.

Installation and Maintenance

AIRMOVER DSA AXIAL UNITS

ELECTRICAL

General Electrical

1 Phase

(230V)

3 Phase

(400V)

Unit

Speed Power flc

Code

rpm