VTS reserves the right to implement changes without prior notice
VENTUS S-Type Air Handling Units
7.3. Cooler
Contamination level of the cooler should be checked during each replacement of the filters. If necessary, the
cooler may be cleaned using vacuum cleaner with soft suction nozzle and washed with using spray
disinfectant.
Some of the cleaners such as for e.g. Pro Care allows to cleaning exchangers and drain pans by rich
spraying the coil or pan surface with using a low-pressure spray and wait several minutes without neccessity
of flushing.
Note! Each type of detergent should be used according to producer guidelines.
While checking the contamination level, also check the capacity of the water siphon. The water siphon should be
filled with water before starting up the AHU.
In order to achieve the maximum capacity of the water cooler, it must be well vented. Venting plugs are
designed to do so and they are placed on the cooler’s collectors.
The disinfection should be carry out by opening the inspection door on one or the others side of AHU.
7.4. Fan unit
Before starting any kind of service works (failure, maintenance, servicing) with AHU, especially in case of
removing cover plates under the drive, please make sure if:
- the device has been properly disconnected from the power supply. It applies both to the main and the
secondary circuits,
- the rotor is not rotating,
- the fan is cold and the surface temperate is safe for handling the device,
- the fan is protected against an unintended start-up.
Fans are designed for transferring dust-free or light-dusted air. They are not designed for aggressive gases,
steams or heavy-dusted air. Operating the fan in an unsuitable environment can lead to the damage of bearings,
corrosion, unbalanced rotor or vibrations.
The fan and motor in the unit have been designed for particular requirements and operation characteristics. Fan
rotation speed is adapted so as the air stream and complete fan stress concentration were appropriate for a given
ventilation system. Smaller stream of forced air results in disturbances in correct operation and leads to loss of
balance of the entire ventilation system. It can be caused by:
- dust settlings on the fan's rotor blades,
- an incorrect direction of the fan's rotations. If the centrifugal fan rotates in an incorrect direction, the air flow is
carried out with significantly worsened capacity.
When the device is operated appropriately, the bearings of fans (motors) do not need to be greased.
7.5. Test measurements
Once the inspections and maintenance procedures are over, check and adjust operation parameters according to
the guidelines stated in point 6.
Please report the maintenance and measurement activities in the inspections and maintenance table.
8. SAFETY INSTRUCTIONS
1. Connection and starting up the AHU should be carried out by the qualified personnel in accordance with
recommended and designed regulations and guidelines regarding the operation of electric devices.
2. Under no circumstances are you allowed to connect the device to the power supply before launching the
protection system.
3. Under no circumstances are you allowed to carry out repairs or maintenance works if the device is
connected to the power supply.
4. The personnel operating, repairing or providing maintenance services of the AHU must be qualified and
authorized to carry out these activities in line with regulations binding in the country where the AHU is
assembled.
5. The AHU assembly location must be equipped with all necessary safety and fire protection equipment in line
with the local regulations.
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