50
IOM_WPHBA-WPHA_091a1201_207954_180610_EN
COMPACT HORIZONTAL PACKAGED WATER-TO-AIR UNITS
WPHBA / WPHA
OPTIONAL
EC MOTOR FANS
Rotation caused by an air flow in the wrong direction
When the fan is stopped (no signal, no electrical supply, etc.), the control of the motor does not interfere if the fan rotates
in wrong direction (due to, for example, an air flow).
If you switch on the fan while it is rotating in the opposite direction, firstly the control will reduce the rotations in a controlled
way until it reaches the ‘0’ value (fan stoppage). Then, the control will make a restart in the correct rotation direction.
The higher the number of turns in the opposite direction, the longer the control will need to reach the fan.
In the event that the fan rotates strongly in the opposite direction, it is possible that the control could not start the fan in the
proper rotation direction.
Information
Maintenance and repairs
Repairing works must be carried out by trained specialists only.
Wear safety shoes and gloves for handling.
Please observe the safety regulations and the protection rules of the worker by all maintenance and service work
(EN 50 110, IEC 364).
Before working on the fan, this must be disconnected from the power supply and secured against switching back
on!
Keep the airways of the fan free
– danger because of objects dropping out!
No maintenance work at running fan!
Depending on the application and the transfer medium the impeller has a natural wear. Deposits on the impeller
can lead to imbalance and thus to damages (danger of endurance fracture). The impeller can disintegrate!
There is risk that the impeller could break because of the massive corrosion in case of transporting the product
in highly aggressive environment that could not be appropriate for it. The affected impellers for this type of
corrosion have to be replaced immediately.
Deposits on the motor, especially in the refrigerating wings and motor cavities, block an appropriate refrigeration
causing a premature disconnection of the motor. Therefore they have to be removed on time (cleaning).
Maintenance interval in accordance with the degree of contamination of the impeller!
Check the fan in regular periods in respect of mechanical vibrations (recommended every 6 months). Keep in
mind the limit values indicated on ISO 14694 and perform correction measures in case of exceeding them (e.g.
posterior balance by trained specialists).
Check the impeller, in particular weld-seams, for possible cracks.
Repair, e.g. by welding is prohibited!
The fan or motor is maintenance-free due to
the use of ball bearings with “life-long lubrication”. At the end of the
grease life (30-40.000h approx.) it is necessary to change the bearing. Please contact our Service Department in
this case as for all other damage (e.g. to the coil or electronics).
Bolted-on wheels and / or wings may only be replaced by authorized manufacturer staff. The manufacturer shall
not be liable for damage caused through improper repair work.
It is necessary a regular inspection, with cleaning if it requires, to avoid the imbalance and obstruction of the
condensation water evacuation openings due to dirt.
Do not switch off line voltage that the fan can start again!
Safe starting of fans is not guaranteed if it is started in reverse. If the application demands
safe starting, the machine manufacturer or owner must prevent reverse driving rotation by
suitable measures.
WARNING!
Содержание VERNE WPHA 091
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