OPERATION AND MAINTENANCE MANUAL
DTR MCK v.2.4
PAGE
GDYNIA
MODULAR AIR HANDLING UNITS
MCKS, MCKH, MCKP
2017 EN
43/45
KLIMOR Spółka z ograniczon
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Installation of masking channel section
Once the AHU is assembled it is necessary to seal channel sections between the sets using silicone.
Figure No. 49
NOTE!
For filling gaps listed in point 11.10 and 12.11 the sanitary silicone is used.
11.11 Design and application guidelines related to DIN 1946-4
Design and application guidelines related to the hygienic version of the ventilation system and other related
devices. The design and application conformity with DIN 1946-4.
Due to the technological application of the air conditioning and ventilation units in the hygienic version in line with the DIN 1946-4
standard, below you can find the design and application guidelines for air conditioning and ventilation systems allowing to maintain
high hygienic level of the complete system. Full description of the requirements is stated in the DIN 1946-4 standard.
- All elements and devices of the system should enable easy service and cleaning access and operations.
- The materials used which are in contact with flowing air cannot emit any substances harmful for people, fibers and odors, and
cannot create conditions allowing for microorganism growth.
- All elements of the air systems have to be appropriately protected till the system start up in order to preserve the hygienic
standards.
- The air ducts should feature sufficient number of cleaning holes and inspection holes with appropriate dimensions or enable
removal of the section.
- All important parts of the air systems have to be marked and described in an appropriate way.
- It is required to locate the air intake in a distance of 3 meters over the ground level and away from other vertical partitions. It
is recommended to avoid locating the air intake in vicinity of the air exhaust, cooling towers, sources of odors or harmful
gases, as well as streets, car parks and areas with external thermal load.
- The designed air ducts have to be made of materials characterized by high mechanical strength, non-rotting, incombustible,
abrasion-resistant and corrosion-resistant.
- Connections of ducts and air fittings should not have any set-offs, gaps and connecting elements cannot be located in the air
flow.
- Sealing agents such as silicone and gaskets should have a certificate of hygiene.
- System sections requiring wet cleaning should be designed and assembled with a decline.
- Air ducts between the air intake and the ventilation unit should be as short as possible and should be easy to clean.
- The air system for the class I rooms should be as short as possible and the air conditioning unit should be located as close as
possible to the rooms being ventilated.
- Dampers installed in the system have to be at least class 2 (tightness) devices.
Class 4 dampers should be used in systems operating in rooms with various cleanliness levels and at the borders of rooms
with the same cleanliness class if this is required to close some sections of the system (e.g. to replace filters in diffusers)
when turning off the whole system is not allowed.
- In air exhaust systems it is necessary to install hygienic exhaust grills equipped with ceiling light fitting with 0,8 mm mesh size,
which can be removed and washed. Air outflow should be designed to provide 80% as lower outflow and 20% as higher out-
flow.
- At air supply outlets in class I cleanliness rooms it is necessary to apply devices with laminar air flow.
- Depending on regulations of the local sanitary inspection authorities it is allowed to use devices supporting air recirculation.
- The air supply and air exhaust elements have to hold up-to-date hygiene certificates.
Once the ventilation or air conditioning system is assembled it is recommended to carry out necessary test, adjust-
ments, validation and commissioning. Testing of filters' integrity and tightness in diffusers should be carried out by a
company with appropriate equipment and authorization. Once the tests are completed they should hand over appro-
priate protocols and delivery documentation.
