Electrical Connection; Inspection / Maintenance - Zehnder CVM Mode D'emploi

Electrical connection

Connect the fan according to the dia-
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gram enclosed, the low voltage direc-
tive, EN 60335-1, EN 60204-1 and the
locally applicable regulations;
Check that the housing is properly
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earthed;
Electrical connections take place to the
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connection block that is fitted in the
volute casing. A PG 16 cable gland is
supplied for feeding the cable through
one of the panels.
Commissioning
Check that the rotor can rotate freely;
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Check that the electrical connections
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have been made correctly and accord-
ing to the diagram enclosed;
The fan must be protected against over-
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loading;
When a motor overload circuit breaker
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is fitted, it should be set at 5% above
the CVM current shown on the type
plate;
Start the fan;
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Check the fan direction of rotation (see
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the arrow on the fan). If the direction of
rotation is wrong the motor can burn
out;
Measure the current drawn. The current
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measured may not (with a fan that is not
speed-controlled) be higher than that
shown on the type plate. The overload
circuit breaker should be set to the
highest measured current. The current
for a speed-controlled motor should
be measured over the entire controlled
range. Set the overload circuit-breaker
to the highest measured current;
The permissible temperature of the air
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to be moved is from -30°C to +40°C;
The fan is designed for continuous op-
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eration and may not be switched on and
off more frequently than once every five
minutes.

Inspection / Maintenance

Before inspection/maintenance of the
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fan is started, it must be electrically iso-
lated: first at the operating switch and
then at the isolation switch;
The motor is equipped with ball bear-
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ings charged with grease, which under
normal operating conditions is sufficient
for 30,000 hours of operation;
Check that the rotor and the motor are
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not damaged or dirty;
Clean the parts if necessary. When
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doing so take care not to damage the
protective coating;
The fan may not be cleaned by spraying
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with water;
After assembly the fan can be switched
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on again. First at the isolating switch
and then at the operating switch.
Faults
If there is a fault, check before getting in
touch with the supplier:
The voltage at the fan motor;
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If the rotor can rotate freely;
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The circuit breakers;
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The direction of rotation of the rotor.
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Note the information on the fan type plate
before getting in touch with the supplier.
EN - 7