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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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It does not matter, whether or not the AHU is floor standing, heightened (e.g. on a scaffold) or
suspended from the ceiling, the easy assembling and maintenance of the AHU has always to be
guaranteed on site
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Depending on the erection, suitable protective actions must be taken to ensure that persons,
buildings and equipment are not jeopardized by falling parts (e.g. tools, screws, etc.) and possi-
ble exit of water or other fluids.
-
The ground around the erection site should be watertight and have with a downward gradient to
a sufficiently sized outlet.
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Where this is not met, the erection of the AHU in a sufficiently sized collecting tray with an outlet
may be an appropriate solution.
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A humidity sensor with alarm transmitter can represent an additional action to protect critical op-
erating conditions.
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For AHUs suspended from the ceiling, it is recommended in any case to provide a sufficiently
dimensioned collecting tray with outlet under the AHU.
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To avoid freezing of components, the customer must ensure, that the AHU is protected against
weather, which could lead to such problems. Additionally, the customer must take further
measures to provide freeze protection. Some possibilities for that purpose are:
o
Complete drainage of the heat exchanger if it is not used
o
Usage of water/glycol mixtures with adequate glycol concentration as fluid for the heat
exchanger. (Attention: Performance loss must be considered)
o
Control-technological frost protection
The customer has to take the decision on appropriate actions, with knowledge of the situation on
site. The installation technician and the operator of the AHU have to ensure the preventive protec-
tion in accordance with the instructions mentioned herein. In this context, it is recommended to con-
clude an insurance against damage caused by water and other liquids.
TRANE 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 shall be mounted on the ceiling, then the device must be fixed with the base frame on
an encompassing suspension see
right. The handling of the structure-borne noise insula-
tion is analogously as for floor AHUs.
Figure 14:
Suspension of ceiling AHUs
