26
Commissioning and Maintenance
Unit part
Interval
(months)
Task
Units for
installation
indoors
1 month
• Clean and refill existing siphons.
3 months
• Check casing for damage/firm seating.
• Check/renew seals on all service openings.
• Check panels for damage and corrosion, renew corrosion
protection and check function of door safety catch (on
discharge side).
• Hygiene inspection (we recommend the maintenance steps
and intervals specified in VDI 6022!): Check built-in parts
for contamination and clean as necessary; carry out wipe
disinfection; check sealing materials for microorganisms and
fungi, clean/replace as necessary.
Units for
installation
outdoors
(roof units,
weatherproof)
• Carry out tasks listed at “Units for installation indoors”.
12 months
• Check tightness of unit roof.
• Check side walls and cover strips, reseal as necessary.
• Check base frame and base frame skirt.
• Clean external weather grille for fresh air and extract air.
Belt driven fan unit
3 months
• Check fan/motor mountings, also check for soiling,
damage and corrosion.
• Check that anti vibration mounts are functioning correctly.
• Check that belt guards are functioning correctly, clean as
necessary.
• Check impeller for imbalance.
• Check tension of V-belt and check for wear; re-tension
or renew as necessary – for description see page 59 and
following pages.
• Check fan/motor for bearing noise, replace bearings as
necessary.
• Observe recommended lubrication interval for fan bearings
without lifetime lubrication (see Table 8-3 on page 61).
Direct driven fan unit
3 months
• Check motors for soiling, damage and corrosion, also
check mountings.
• Check motors for bearing noise, replace bearings as
necessary.
• Check impeller (particularly welded seams) for cracks;
replace bearings if necessary.
