Commissioning and Maintenance CAIRplus
64 PR-2009-0096-GB • Subject to modifications • R8-10/2015
Carry out the following maintenance and inspection steps:
• Check fan for secure mounting.
• Check fans for dirt, damage and corrosion.
• Check anti-vibration isolators for proper operation
• Check belt protection grille for proper operation, clean if necessary.
• Check impeller for unbalanced condition.
Re-tensioning or replacing V-belt
Initial check:
• Perform the initial check following 50 hours of operation
Regular checks: Subsequent checks depend on the operating load and experience.
• Check every three months, if the unit operates on a regular daily basis (approx. 8
hrs a day).
• With higher operating hours perform more frequent inspections.
Fig. 8-1: High-performance narrow V-belt as per DIN 7753
• Inspect the belt for tension and wear, re-tension or replace if required.
To re-tension the belt using the motor mounting plate or replace:
• Slacken the counter nuts of the set bolts.
• Replace the belt , if required.
• Check the pulley alignment and adjust, if required (fig. 8-2).
• Tension the fan belt (measure using a belt tensiometer or frequency calculation
method, fig. 8-2).
• Tighten counter nuts.
An acceptable belt deflection at a load of P = 20-30 N is from 5 to 20 mm, depending
on the axis distance (see fig. 8-2).
Belt
profiles
Smallest pulley
diameter (mm)
F force
(N/belt)
SPZ 70 – 85 13 – 19
86 – 155 15 – 23
116 – 150 19 – 27
151 – 200 25 – 24
201 – 250 29 – 38
SPA 112 – 150 25 – 34
151 – 200 29 – 38
201 – 250 35 – 44
251 – 300 40 – 50
SPB 180 – 224 40 – 52
225 – 300 46 – 60
301 – 400 55 – 76
401 – 500 67 – 90
ATTENTION
Equipment damage and notice
• Always reduce the distance between the axes to the point where the V-belt
can be placed in grooves without applying force. It is not allowed to use
crow bars, screwdrivers or similar tools for belt mounting.
• If the V-belt pulleys are fitted with several grooves, replace all V-belts.
• Do not use a belt set consisting of belts from different manufacturers.
• Belts do not require any special maintenance. Avoid using belt wax and
belt spray.
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