Translation of original operating instructions
106
AL-KO AT4F ATEX
7.3.1.2 Cleaning
Only methods that do not damage the fins may be used for cleaning of the heat exchanger registers.
Cleaning methods
Can be used for all types of finned heat exchanger
1
Compressed air
All heat exchanger registers
2
Steam cleaners
Steel galvanised heat exchanger registers only
3
High-pressure water cleaner
only
with THD multi-jet method All heat exchanger registers
ATTENTION
When using compressed air and steam cleaners ensure a sufficient distance and that the jet
is aligned parallel to the fins.
The heat exchanger must be integrated back into the unit potential each time the equipotential
bonding is released.
NOTE
Complete removal of the deposits in heat exchangers is not possible using compressed air.
Thorough cleaning cannot be guaranteed, particularly in deep registers, by using only com-
pressed air and steam cleaners.
As a result, the dirt deposits are compacted in the depths of the heat exchangers instead of
being removed. The consequences are increased pressure losses, a lack of hygiene, odours,
material attack, etc.
The use of high-pressure water cleaners using conventional spray nozzles is not permitted as these can damage the
delicate fins and thorough cleaning, particularly in the deeper heat exchanger registers, cannot always be achieved.
Heat exchanger registers should therefore only by cleaned with high-pressure water cleaners using the THD mul-
ti-jet method. This ensures damage-free deep cleaning of the heat exchanger registers. This applies to all heat ex-
changer register types.
The cleanability of the AL-KO THERM heat exchanger registers using the THD multi-jet method was demonstrated
by the Institute for Air Hygiene Berlin during the hygiene conformity evaluation for the AL-KO air handling units (see
figure THD multi-jet method).
The use of the THD multi-jet method includes the correction of any bent fins to restore the optimum flow and per
-
formance of the heat exchangers ("fluidic renovation").
1
2
Fig. 64 THD multi-jet method
1
THD multi-jet method/front
2
THD multi-jet method/back
For further information on the THD multi-jet method:
THD
Technischer Hygiene Dienst GmbH
Am Kleingewerbegebiet 3
D-15745 Wildau
Phone: +49 / (0)30 / 66 76 57 75-0
Fax.:
+49 / (0)30 / 66 76 57 75-5
E-mail: [email protected]
Web: www.thd-berlin.de
Summary of Contents for AT4F Series
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