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The device-specific explosion protection, outside this category must provide themselves with
frequent disturbances or equipment faults, which normally have to be considered, the re-
quired level of security.
Air leakage rate:
The air leakage rate of the air conditioner is determined at a vacuum of 400 Pa. The device
corresponds to the tightness class L1 to EN 1886.
Tightness Class L1 corresponds to a maximum air leakage rate of 0.15 l/(s*m2).
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This must be considered, therefore installation of equipment in areas with natural convec-
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tion.
During maintenance work must be ensured, that no explosive atmosphere is present.
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Before starting the system ensure that all doors are closed and properly sealed so that there
are no leaks and the device cannot be opened unintentionally.
The following conditions must prevail:
On the intake side and in the vicinity of the device, the temperature shall not exceed -20
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°C to +60 °C.
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An atmosphere with pressures from 0.8 bar to 1.1 bar shall be present in the environment
of the AHU.
11.3 Information for commissioning, maintenance and repair
11.3.1 Foundation and erection
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Refer to chapter 4 (Foundation / erection).
The AHU must be connected to an external protective conductor system.
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11.3.2 Assembly connection
Motor:
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Electrical connection, refer to chapter 7.2 (AC motors): standard repair switches must
be assembled outside the hazardous area.
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Connection potential compensation: according to the provided instructions of the motor
manufacturer.
In general:
All conductive connections (WT piping, siphon, ducts, ...) must be connected to a poten-
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tial compensation.
It must be ensured that parts that are necessary to achieve the degree of protection,
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cannot be removed accidentally or unintentionally.
All doors are equipped with a closure device. The doors must be locked and the key re-
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moved.
During maintenance is to take care that no tools or other objects remain in the
unit or duct system, to avoid malfunctions and sparks. – Risk of explosion!
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