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VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
Before closing the filtration section please make sure to:
- remove protective foil from filters,
- assemble filters in their slideways so as the bag were in vertical position,
- check filters' condition and leaktightness of fitting in the slideways,
- check settings of differential pressure controls (if they are applied) which
determine permissible static pressure difference qualifying a filter for
replacement.
Table 10. Permissible pressure difference according to EN 13053
Filter type and class
Permissible pressure
difference
P.FLT
G 4
150 Pa
B.FLT
G 4
150 P
а
M 5
250 P
а
F 7
250 P
а
F 9
350 P
а
According to the Ecodesign 2018 Directive the AHU with a filter must be equipped with visual
filter dirt indicator or the control system alarm to show when the pressure drop across the
maximum value allowed for the filter.
Besides the full control system VTS offer separate device - pressure transducer with a display plate
for installation on the filter inspection door. Detailed information can find in the separate document
for the differential pressure indicator.
5.3 Water and glycol heaters
Check the following:
- condition of heater's lamellas,
- connection of supply and return pipelines,
- if the anti-frost thermostat's capillary is firmly attached to the heater's casing,
- setting of the anti-frost thermostat (factory setting: +5ºC),
- if heater's control valve has been installed in accordance with markings shown on its casing.
5.4 Electric heaters
Check the following:
- electric connections, in accordance with electric diagrams for heaters' connection,
- connection of the protection thermostat,
- if the heating units do not touch other elements within the heating section,
- if the heaters' heating units are not damaged.
5.5 Water and glycol coolers, freon coolers and heaters
As in case of water heaters, check the following:
- condition of the cooler's lamellas,
- connection of supply and return pipelines,
- condenser position towards the air-flow direction,
- assembly of the siphon - fill it with water before starting the AHU up,
- passability of the condensate drainage system.
5.6 Evaporative humidifier
