Instruction Manual ZHK
V07-21.0
39/140
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Internal and external cleaning (also wet cleaning) can be performed on the AHU. When per-
forming this work, leaking / dripping of the cleaning fluid is possible.
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All parts which are in contact with water inside and outside of the AHU may freeze under cer-
tain environmental conditions. Particularly, the following components have an increased risk of
freezing:
o
Condensate pans of heat recovery systems and heat exchangers inclusive pan nozzles,
siphons and drains
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Freezing condensate directly on the heat recovery system and heat exchanger
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Freezing operation fluid of heat exchangers with/without glycol
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Humidifier section (spray humidifier and honeycomb humidifiers are not applicable for
outside AHUs)
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All areas and parts of the AHU which are exposed to the weather.
4.2.2 Actions to prevent potential risks
These risks can be prevented by the following actions:
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The position/ location of the AHU does not really matter. For example, whether or not it is situ-
ated on a floor, heightened on a frame or suspended from the ceiling. The important aspect is
that there is guaranteed access and appropriate space onsite for assembling and maintenance
of the AHU.
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Depending on the installation, suitable protective actions must be taken to ensure that persons,
buildings and equipment are not at risk from falling parts (e.g. tools, screws, etc.) and possible
drainage of water or other fluids.
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The ground around the installation site should be watertight and have with a downward gradi-
ent to a sufficiently sized outlet for drainage.
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Where this condition is not met, the installation of the AHU in a sufficiently drainage system/
pan with an outlet may be an appropriate solution.
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A humidity sensor with an alarm transmitter can offer additional protective support in critical op-
erating conditions.
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For AHUs suspended from the ceiling, it is recommended, in any case, that a sufficiently di-
mensioned collecting tray with outlet, positioned under the AHU is acquired.
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To avoid components freezing, the customer must ensure that the AHU is protected against
adverse weather conditions and resulting temperature variations, which could lead to such
problems. Additionally, the customer must take further measures to provide freeze protection.
Some recommendations for that purpose are:
o
Complete drainage of the heat exchanger when it is not in use
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Usage of water/glycol mixtures with adequate glycol concentration as fluid for the heat
exchanger. (Attention: Performance loss must be considered)
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Control-technological frost protection
The customer has to make decisions on appropriate actions, through their knowledge of the situa-
tion and conditions on site. The installation technician and the operator of the AHU have to ensure
preventive actions and protection, in accordance with the instructions mentioned herein. In this
context, it is recommended to have insurance against damage caused by water and other liquids.
EUROCLIMA is not liable for damages that may arise due to leakage of the AHU, of fittings, of
pipes or hoses or due to condensation.
4.2.3 General indications for the erection
If floor AHUs are to be mounted on the ceiling, then the device must be fixed with the base frame
on an encompassing suspension system (see
right). The handling of the structure-borne
noise insulation is resemblant of for floor AHUs.
Содержание ZHK
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