Specifications

COLASIT AG
Plastic construction
CH-3700 Spiez
Phone [phone] Fax [phone]
Edition 2011 / Subject to alteration
Copyright by COLASIT AG Spiez
Page 12
7 Maintenance, repair, cleaning
7.1 Preparation
Before any work is carried out on the fan, the fan must be set to its "safety
position".
The „safety position“ is defined as follows:
- The drive must be currentless and the main switch secured against switching on,
- The fan impeller can be manually rotated,
- Fan must be flushed with fresh air and be condensate-free,
- Fan must be at room temperature,
- Personal protective equipment must be available and it must be worn. (Use of protective gloves
because of sharp edges, ear protectors if necessary).
- A sign, e.g. „Under-repair“, must be attached to the system,
- The safety devices may be removed,
- The work to be carried out must not be done under time pressure,
- The general and specific regulations on accident prevention as well as the EKAS guidelines
(Switzerland) must be observed,
- The safety officer must be informed about the nature and course of the work,
If the intake and delivery ducts of the fan are dismounted for a longer period of time, the openings must be
closed off.
7.2 Performance
The fan must be maintained in accordance with the Maintenance Plan below. The maintenance work carried
out must be noted down in the logbook (see the section on Logbook).
Every week Every month Every year
 Make a visual inspection of fan
for damage, leaks, corrosion
and attachment.
 Check the smooth running of the
fan and electric motor.
 Check state and tension of the
V-belt and replace if necessary.
 Check the impeller and casing
for deposits and clean if
necessary.
 Check the shaft bearing for
smooth running and vibrations.
Bearing maintenance -> see
chart below for regreasing
intervals.
 Remove any dust deposits on
the fan and motor.
 Check the flexible transitions
from fan to duct system for
leaks and state.
 Check the function of the
condensate nozzle.
 Check the state of the vibration
dampers.
 Check the state of the hub
gasket (if fitted).
 Carry out a thorough cleaning
of the entire fan (including
impeller).
 Check the parts in contact with
the conveyed medium for
corrosion.
 Check the minimum clearance
between the impeller and
casing (minimum 1% of intake
diameter, maximum 20mm).
 Measure the vibrations at
bearings (KA) or motor (DA).
Permitted value acc. to ISO
14694 Class BV-3, 5.1mm/s.
 Check the safety devices (e.g.
splinter protection or intake
grating) for condition and
function.
 Check the stands for damage
and stability.
 Check all screw unions for firm
seating.
Normally the bearings are designed for a service life of 40,000 hrs. After this
period the bearings must be replaced. The service life of the bearings is reduced
when subjected to increased requirements (e.g. high temperature, aggressive
ambient air or operation with frequency converter).
On drives with V-belts, check the tension regularly and monitor the belts closely particularly during the first
weeks of operation. This also applies after long periods of downtime. Excessive tension leads to bearing
damage, insufficient tension leads to slip, wear and frictional heat.