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and that the switch is locked in position 'off' in order to effectively prevent a re-activation during
the work. The housing of the AHU interior lighting (can have separate supply) is not current-car-
rying.
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all moving parts, especially the fan wheel, motor and heat wheel have come to a standstill; wait
at least 5 minutes after switching off before opening the doors.
Remove the key from doors with door lock before entering in the casing of the AHU. Keep the
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key out of reach of unauthorized persons.
Check that the hot media supply is interrupted and all the heat registers, heat exchangers, etc.
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are cooled to ambient temperature.
In case of standstill of the plant (e.g. power failure), make sure that the main
switch is always checked. Only when it is in the off position and secured against
unintentional restart, appliance doors can be opened, cable plug connections can
be disconnected and work on the device can be carried out.
Start of the AHU
Ensure after working and before the start that...
nobody is in the AHU.
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all protective devices are working, (optional safety devices such as the door guard mounted
again) and doors equipped with door locks are locked and the keys are removed – refer to
chapter 5.2 (Doors).
Storage of potential energy in gases and fluids
All heat exchangers can be operating up to a maximum pressure of 15 bar. If the
fluid is under higher pressures, the safety and tightness cannot be guaranteed.
Preventing the risk of explosion and fire spread
To prevent the fire spreading, fire dampers shall be installed into the ducts be-
tween the fire compartments.
Prevention of exposure caused by antifreeze agents
Avoid body contact with antifreeze agents, because they may cause burns. Always
wear appropriate protective clothing (e.g. gloves, goggles, ...).
In case of fire, avoid the danger zone and meet different safeguards. It is recom-
mended to wear a mouth guard, because of the risk of poisoning by inhaling the
vapors.
Prevention of hazards caused by suddenly falling out door panels while opening of remova-
ble panels
Removable door panels can fall out after detaching the connections and lead to inju-
ries. Particular care should be taken when removing pressure sided doors because
they can be firmly in place then suddenly detach. The user must be able to carry the
weight of the door. At doors with a surface of > 0.5 m² two persons are necessary.
Please note the instructions on the AHU and subsequent instructions exactly.
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