FUTURE® S AIR HANDLING UNIT
OPERATION AND MAINTENANCE
INSTRUCTIONS
15 December 2020
Ver 1.7 (We reserve the right to changes without prior notice)
19
4.4 Maintenance
The filter section is to be serviced and cleaned twice a year, normally in the autumn and spring.
To measure the pressure drop, a filter indicator indicating the pressure difference across the filter has been
installed on the filter section. When the pressure difference across the filter exceeds the set limit, the filter
must be replaced. Refer to the unit design documentation for the recommended filter-specific final pressure
drop with design air flow.
The filter pressure difference values must under no circumstances exceed the dimensioning pressure drop in
the filter by more than two times. If the pressure difference is exceeded, the components or structure of the
unit may become damaged. The warranty does not cover damages due to negligence in replacing the filters.
Replace the filters if the pressure difference limit in the filters has been exceeded, or if the filters are dirty or
damaged Replace filters at least once a year to prevent microbial growth.
• Check that the filters are intact and of the correct type.
• Check that the filters are tight against the frame gasket and that there are no leaks.
• Check that the filters are clamped in place.
• Check that the differential pressure gauge is intact and reset.
• Check that the differential pressure hoses of the filter section are intact and in their places.
• Check that the differential pressure transmitter operates properly and has been calibrated according to the
manufacturer’s instructions. Check also that a pressure difference limit, which must not exceed the
dimensioning pressure drop by more than two times, has been set in accordance with the Future®
dimensioning program documentation.
4.5 Replacement of filters
1. Open the access door and the clamping mechanism. Pull the filter (filters) out of the casing.
2. Clean the casing, if necessary.
3. Check the condition of the gaskets. Replace worn and damaged gaskets.
NOTE! Gaskets are not needed
between filters that are mounted parallel to each other.
4. Place new filters in the mounting grooves and clamp the filters against the gasket. Note! Ensure correct
filter type. The filter type is displayed on the technical printout of the unit.
5. Replace the maintenance hatch.
6. Check the operation of the filter indicator once the fan has been restarted.
Summary of Contents for Future S
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