11.3.3 Fan section
- Refer also to chapter 9.2 (Fan / motor group).
- Belt: It's only allowed to use electrically conductive, flame retardant and self-extinguishing
belts (ISO 9563 or ISO 1813).
- Use original spare parts.
In addition to these data, the guidelines included in the operating instructions of the fan and
motor manufacturer are to follow.
11.3.4 Air filters
- It's only allowed to use electrostatic deductive filter.
- Use original spare parts.
- For filter types that are equipped with potential equalization cable, each filter cell must be
connected to the potential settlement with the AHU in the fixed-mounted metal filter frame
using self-tapping screws or bolts.
- To prevent the formation of an explosive atmosphere by stirring up of dust deposits, the
equipment has protective systems and components designed to avoid deposits of com-
bustible dusts as far as possible. Therefore, for all components corresponding service
openings are provided.
- Periodically the AHU shall be cleaned (depending on the amount of dust) from dust.
11.3.5 Heat exchangers / steam humidifiers
The in the data sheet indicated heat exchange medium temperature and the
steam humidifier surface temperature shall not be exceeded. Otherwise, the
specified temperature class is no longer valid - danger of explosion! -and the
declaration of conformity loses its validity.
11.3.6 Field devices
On site assembled field devices must comply the ATEX class specified by TRANE.
- The electrical components (switches, lights, sensors, motors, etc.) must be approved for
operation in explosive atmospheres and must be equipped with an appropriate marking.
- The cabling must meet the relevant standards.
- Appropriate potential equalization has to be prepared.
- Outdoor units must be equipped with a professional lightning protection system and all
metal parts have to be connected to the ground conductors.
- For indoor units all electrically conductive parts must be protected with a professional
grounding measure (potential equalization). By derivation of lightning currents, this
measure prevents the formation of ignition sources.
- Pipelines must be considered as a potential ignition source, since their temperature can
rise up to 110°C.
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