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Maintenance Manual
Service the drain tube as follows:
1. Remove the ACU from the back of the cabinet.
2. Remove the clip at the top of the tube.
3. Draw the other end of the tube from the rubber bushing
4. Replaced the tube with a new one.
!
Drain tube replaced (ACU)
4.4.
Cleaning the recuperator (HE)
Dust sedimentation will occur on the recuperator (especially the external air path)
and must be cleaned every six month to ensure optimum performance.
Recuperator plates are to be cleaned with compressed air, or in special cases with a
pH-neutral soap/water solution (external air path only) sprayed on with compressed
air.
CAUTION
After cleaning the recuperator tick off the box
!
Recuperator cleaned (HE)
Page
16 (27)
Do not use water spray for the fans. Use compressed air and/or
water spray only for the external air path of the recuperator;
being careful not to damage the foam seal.
Sedimentation on internal air path indicates a leak in the
cabinet or enclosure and further action is needed.
©
1999 Nokia Telecommunications Oy
¨ yes or ¨ no.
¨ yes or ¨ no.
Document Number/Version
NTC DN9986052/1.0.0
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