Instruction Manual ZHK
V07-21.0
131/140
DANGER!
The maximum allowable surface temperature must always be lower than
the ignition temperature of the explosive atmosphere. Safety factors are
considered.
11.5 Additional instructions for foundation and erection, assembly, connection and
commissioning, maintenance and repair
In addition to these specific specifications, the general instructions in this manual (in case of differ-
ing specifications, the ATEX-specific specifications must be observed in priority) and the instruc-
tions in the manuals of the component manufacturers (e.g. fan and motor manufacturers, etc.)
must be observed. See also
chapter 1.6 (Documentation)
of this instruction manual.
The following measures are necessary to ensure the Equipment Protection Level (EPL):
-
All conductive parts, components and connections (HE piping, siphon, ducts, etc.) must be
connected to a potential compensation. Before opening and closing such connections, For ex-
ample, when removing or replacing parts, bridging by means of connecting cables with an ap-
propriate cross-section is necessary.
-
For indoor AHUs, all electrically conductive parts must be connected with a professional ground-
ing measure (potential equalization). This prevents electrical potential differences, which can be
a potential ignition source.
-
Outdoor AHUs must be equipped with a professional lightning protection system and all metal
parts must be connected to the ground conductors.
-
It must be ensured that parts that are necessary to achieve the degree of protection, cannot be
removed accidentally or unintentionally.
-
Before the commissioning of the AHU, it must be ensured that all doors are closed and
properly sealed so that there are no leaks. All doors are equipped with a closure device. The
doors must be locked, and the key removed
DANGER!
During assembly and maintenance work it is important to take care that no tools
or other objects remain in the AHU or duct system, to avoid malfunctions and
sparks.
–
RISK OF EXPLOSION!
11.5.1 Foundation and erection
-
The AHU must be connected to an external protective conductor system.
-
In case of zone reduction between inside and outside of the AHU, an air exchange rate in the
room of 6 times per hour must be ensured, for indoor installation.
-
For outdoor installation, a free air flow along an axis is the precondition for zone freedom outside
the AHU.
11.5.2 Assembly, connection and commissioning
Ensure the tightness of the AHU
To avoid zone entrainment during operation, the casing must comply with tightness class L1 accord-
ing to EN 1886. Tightness class
L1
corresponds to a maximum air leakage rate of
0.15
l/ (s*m2) at
a vacuum of 400 Pa.
Air leakage rate:
To comply with the required air leakage rate after the assembly of the AHU, the following points must
be considered:
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