Sirius 800 www.snellgroup.com Power Supply and Fan Maintenance
Issue 1 Rev 1 Page 30 © 2014 Snell Limited
4.4.4 Front Fan Replacement
The fan assemblies comprise of blocks of individual fans mounted within a door. Each fan
assembly door can be opened by releasing the top and bottom plungers and swinging the
assembly open on its hinges.
Opening the individual fan assemblies provides access to the various modules within the
frame. The fans can be safely hot-swapped without the need for the system to be powered
down.
1. Before starting identify the configuration of your frame using Table 4. on page 26.
2. Now identify the part number of the fans that need replacing:
Sirius 830: see section 4.4.2
Sirius 840/850: see section 4.4.3
• The fan assemblies should be placed back into the closed position as soon as
possible after opening, as this ensures correct ventilation of the frame. Failure to
do this will result in failure.
• In practice the maximum time that a fan assembly can be left open will depend on a
number of factors such as; ambient temperature, frame loading, crosspoint
routings, etc. To ensure correct operation under all conditions the fan assemblies
should be left open for no more than 4 minutes at a time.
• No service tools are required to replace the fan modules, but the modules should
be replaced by qualified personnel.
• Replacement fans modules should be fitted immediately after removal of the faulty
fan modules as this ensures correct ventilation of the frame. Failure to do this will
result in failure.
• Take care not to trap any cables when opening and closing fan assemblies.
Warning The fan blades can continue to spin for a short time after the fan module has
been removed from the frame assembly.
Fig 8. Sirius 840 Fan Assemblies shown
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