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Bearings
During cleaning maintenance, please keep on mind
the following instructions:
1. The bearings of the electrical motors should not
need any maintenance, nonetheless it is advised not
to exceed the limit of 15.000 - 20.000 hours of
ensured working.
2. Other bearings, involved in transmission groups,
need to be replaced every 10.000 - 15.000 hours
depending on the temperature conditions and
humidity of the circulating air.
3. Special bearings , self-covered with external
greasers, are involved in special conditions and, in
general, they don' t need either maintenance.
Their life, in designed extreme conditions, usually
don' t exceed 500 - 1000 hours of working time. It
is very important never mix grease with different
chemical compositions and viscosities.
Adjustable air grids
In case of connecting adjustable air grids (manual or
electronic controlling), a check is required every 180
days:
- surfaces cleaning and checking;
- functioning verify (a correct opening and/or control).
Type of check
Safety systems
- checks and tests
Motors, fans, drive system:
- cleaning motorfan assembly;
- bearings, eventual replace
adjustable air grids
- check
Precautions in case of keeping machine off for a
long time
If the appliance is to be out of operation for a lengthy
period, need to manage the following ispections:
• periodically, every 30 days or so, rotate the motor
and fan for a few seconds to prevent any damage to
the bearings. After that, a complete running test is
required (1 hour is advised);
• check all components: they need to maintain the
initial status, without signs of strains or noises;
• Disconnect the power supply from the electric
system, creating/putting an alert of "machine off"
status.
Important: all QBK models have a thermal protector
that can temporarily make the motor stop.
Therefore do not access to the fan without previously
disconnecting it from the network.
In three-phase models such protection activates the
contactor circuit of the electrical installation.
90
180
12
days
days
days
**
**
**
**
Type of problem
Probable cause
Faulty power supply
Faulty electrical
1.
Safety system
component
not working
Fan blades rotating in
wrong direction
Exccessive appliance
load loss
2.
Low air flow
Vents closed
Appliance load loss
less than nominal
3.
High air flow
Inspection panel open
Fan or motor bearings
worn
Fan vibration damper
too compressed
Unsuitable vibration
damper supports
Low balanging
tollerance in rotating
components
Rotating components
not properly fixed on
4.
Excessive
shaft (blades and/or
noise and/or
pulley)
vibration
Foreign bodies
interfering with
rotating components
Panel screws loose
Power supply missing
one phase
Incorrect mains
voltage

Accessories

It is possible to also order these optional accessories
indicated below :
On/off security switch (max 16A):
Code
25059
Action
Electrician needed
Replace component
Help needed
Connect motor
correctly
Check the design and/or
appliance
Modification to fan
section needed
Open the vents and
check operatingfunction
Adjust vents and
check operating
function
Check the design
and/or appliance
Close inspection
panel
Replace bearings
Reposition fan
Help needed
Help needed
Balance or replace
rotating components
Help needed
Fully tighten the screws
on fan blades and pulley
Clean inside the
appliance
Fully tighten fixing
screws
Check terminal
connections and
tighten if required
Compare voltage with
that shown on ID
plate
Description
SWT 16
19

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