VTS reserves the right to implement changes without prior notice
VENTUS S-Type Air Handling Units
5. PREPARATION FOR START-UP
AHU start-up at putting the ventilation system into service can be carried out only by the
qualified and
competent personnel
. Before the system is launched, it should be thoroughly cleaned. Check if:
- any of automatic elements or equipment were not damaged,
- all ventilation devices are mechanically installed and connected to the ventilation system,
- ground cables connecting the control gear with ventilation ducts are installed,
- hydraulic systems are fully installed and ready for operation and the cooling medium is present during the
start-up,
- electric devices are wired and ready for operation,
- siphons and the condensate drain-out system from drain plate are installed,
- all automatic elements are installed and wired.
5.1. Electrical system
Before closing connecting boxes of the electric devices check the following:
- basing on the appropriate electric diagrams - verify the conformity of connections,
- application of protection units for all electric devices,
- fastening of all screws and an appropriate assembly of any supporting elements and electric connections
(also unused support terminals - if any),
- cables and wiring - for conformity with all relevant safety, functional, cross-section, etc. regulations,
- appropriate ground and protection systems,
- the interiors of the connecting boxes - if there are no loose or redundant cables left.
5.2. Filters
Air filters in AHU prevent dust from getting into ventilated rooms. Additional, they protect other AHU functional
elements (e.g.: water exchangers) against contamination.
The AHU can only be operated with assembled filters.
Before closing the filtration casing please make sure to:
- remove protective foil from filters,
- check filters' condition,
- check settings of differential pressure controls (if they are applied) which determine permissible static
pressure difference qualifying a filter for replacement.
Permissible pressure difference for panel filters used in AHU SVS 35-100 is 150Pa
5.3. Fan unit
Electric connection of the motor fan should be made before connecting the ducts, to ensure the
appropriate direction of the fan rotation.
Due to the fact that in the AHUs SVS 35-100 the access to the fan section is limited by a
closed casing without simple inspection door, all checking activities should be done before the
duct installation.
Check if:
- the fan's rotor rotates freely, without any friction against the casing elements,
- ground and protection connection are done correctly,
- all dampers on the ventilation ducts network are set in accordance with the design,
- the rotor rotation direction is the same as a direction of the arrow placed on the fan's casing (switch on
the fan by pulsing). If they are arranged in different directions, interchange any two phases in the motor
connection box or change the rotation direction on the frequency converter.
Access to the fan assembly is possible via revision hole after unscrewing screws around the
revision panel frame.
EN
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