CAUTION:
Keep coils from freezing. When water inside coils is allowed to freeze, serious damage will be
caused to the tubes. So, if there is a danger of freezing, anti-freeze chemicals should be added to the
circulating water or if the coil will not be operated for a short time, some water circulation should be
provided inside the tubes. If the coil will not be operated for a long time, it is recommended to drain to coil.
C) Filter Sections
Condition of the filters should be checked once a week. Dirty filters reduces the air flow and hence the
capacity. A manometer, measuring filter pressure drop should be fitted to filter section. If other not stated
on the unit, please use the recommended maximum pressure differentials for different kind or filters that
are given on below table. When manometer reading shows these values, filters should be cleaned or
replaced, and these values should not be exceeded. Synthetic or metallic filter media can be cleaned or
washed. However it is recommended to replace synthetic media in every two years. New filters should be
assembled in the right position that the rough and open side looks to the dirty air, smooth face to the clean
air side.
If there’s gasket on the previous filter frame, to achieve the necessary tightness do not forget to apply the
same media (absolutely same way) on the new filter after renewal.
Other type of filters such as throw away media, bag, absolute and roll filters must be replaced with new
filters of same type, size and efficiency.
After opening the service door, the filters can be taken out by pulling aside.
Synthetic bag filter can be cleaned by vacuumed or compressed air besides can be washed with the
sensitive detergent and warm water.
28
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Air Handling Unit Installation, Operation And Maintenance Instructions
FILTER GRADE
INITIAL PRESSURE
DIFFERENTIAL
RECOMMENDED MAXIMUM
PRESSURE DIFFERENTIAL
G-2
G-3
G-4
25 Pa
40 Pa
50 Pa
150 Pa
150 Pa
150 Pa
Table 2: Pressure differentials for panel filters
FILTER GRADE
INITIAL PRESSURE
DIFFERENTIAL
RECOMMENDED MAXIMUM
PRESSURE DIFFERENTIAL
G-4
F-5
F-6
F-7
F-8
65 Pa
55 Pa
60 Pa
115 Pa
165 Pa
150 Pa
250 Pa
250 Pa
250 Pa
350 Pa
Table 3: Pressure differentials for bag filters
Содержание FourSeason KKS 062 - 046
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