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Servicing and Maintenance
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6.0 SERVICING AND MAINTENANCE
6.1 General Inspection on Fans—Annual
• Check for unusual bearing noises. (Check for excessive bearing play.)
6.1.1 Fan Replacement
The expected service life is approximately 40,000 operating hours at a temperature of 40°C (104°F).
1. Remove the housing cover from the unit (with earth cable).
2. Determine which fan has failed.
3. Check the surface temperature of the fan and switch off the circuit breaker.
4. Disconnect supply cable at the fan terminal block.
5. Loosen the four fastening nuts for the fan to be replaced.
6. Remove the failed fan.
Figure 11 Replacing a fan
!
WARNING
Risk of high speed rotating fan blades. Can cause serious injury.
Disconnect all local and remote electric powers supplies and assure that fan blades have
stopped rotating before working within the unit.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies before working within the unit.
!
CAUTION
Risk of explosive discharge of water under pressure. Can cause injury or equipment damage.
Shut off the water supply and relieve pressure before working with piping.
NOTE
Service and maintenance work must be performed only by properly trained personnel and in
accordance with applicable regulations as well as with manufacturers’ specifications.
NOTE
Use only original spare parts that have been tested and approved by the manufacturer. If
necessary, request a comprehensive spare parts list from the manufacturer. For cleaning, use
commercially available cleaning agents only. Follow the stipulated safety measures and do not
use any tools that may cause scratching or tools for scraping (surfaces will be irreversibly
damaged).
Step 3:
Disconnect
supply cable
at the fan
terminal
block
Step 4: Undo
the four
fastening
nuts
One of four
fastening nuts
Slot to
insert
wrench to
remove
nut