10
4.2 - Dampers
- Check if the actuator motor is installed in accordance
with the supplier’s instructions.
- Check if the correct angle has been set.
- Check if the dampers close properly.
- Check if the damper can open to the required angle.
- Check operation after the power has been restored
following a power cut. Some dampers must be open,
others must be closed.
4.3 - Air filters
- Check if the correct filters have been installed.
- Check if the filters have been installed correctly.
- Absolute filters are supplied separately, to prevent
contamination during transport and start-up. Insert the
absolute filters only after the unit has been cleaned.
- Set pressure switches or filter indicators, if used.
- Close the inspection door.
4.4 - HEATERS
4.4.1 - General
- Check connections in accordance with the dimensional
drawing.
- Check connections for leakage.
- Ensure that the heater can supply heat to prevent frost
formation when the fan is started.
- Caution: When the coils are drained, no water must
remain in the circuits to prevent freezing at temperatures
below zero.
4.4.2 - Electric heaters
- Ensure that the heater has been connected in accordance
with the instructions of the supplier. The diagram is
located on the inside of the connection module.
- Check the heater current.
- Check if the safety devices shown in the wiring diagram
have been installed.
- Check if the heater has been earthed in accordance with
local instructions.
- The electric heater may only be switched on if the
minimum specified air flow rate across the heater exists.
- The electric heater must be switched off at least 5 minutes
before the AHU is switched off.
- Ensure that no objects have been left in the heater section.
- The following warning pictograms are attached to the
panel: electrical voltage and hot surface.
4.4.3 - Steam heaters
Steam heaters have surface temperatures above 100ºC.
Steam supply must be checked by qualified personnel.
- The steam heater may only be switched on if the
minimum specified air flow rate exists across the heater.
- Ensure that no objects have been left in the heater section.
- The steam heater must be switched off at least 5 minutes
before the AHU is switched off.
- The following warning pictogram is attached to the panel:
hot surface.
Manual operation Actuator-assisted operation
(12 pages)
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