4.2 Erection
4.2.1 Potential risks that may arise through the erection site
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For heating or cooling water, water-glycol circuits or steam lines for heating or cooling can be
connected to the AHU. There may also be internal (closed) water or water-glycol circuits. In
addition, a humidifier with inlets, outlets, overflows may be installed for humidification.
The pipes or hoses and their fittings can become leaky or loose, so that inside or outside of
the AHU water or the medium exits.
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Cooling processes can cause dehumidification and the associated formation of condensation in
the AHU. The unit is then equipped with condensate collecting trays and outlets.
Nevertheless, condensate can exit from the AHU in case of errors on the unit, under inad-
missible or extreme operating conditions. Errors on the unit, inadmissible or extreme operating
conditions can also cause the formation of condensate on the outer surfaces of the AHU, which
may then drip down.
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Internal and external cleaning - also wet cleaning - can be performed on the AHU
When performing this work, an exit/dripping down of the cleaning fluid is possible.
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 the AHU is floorstanding, heightened (e.g. on a scaffold) or sus-
pended from the ceiling, the easy assembling and maintenance of the unit 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,
building and equipment are not jeopardized by falling parts (e.g. tools, screws, etc.) and possi-
ble exit of water or other media.
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The ground around the erection site should be watertight and executed with a downward gradi-
ent 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 out-
let may be an appropriate solution.
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A humidity sensor with alarm transmitter can represent an additional action to protect critical
operating conditions.
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For units suspended from the ceiling, it is recommended in any case to provide a sufficiently
dimensioned collecting tray with outlet under the unit.
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 air handling unit have to ensure the preven-
tive protection in accordance with the instructions mentioned herein. In this context, it is recom-
mended to conclude 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.
Summary of Contents for CCEB
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