Vent-Axia Serene Instructions D'installation page 5

3) LED Display with prism (Fig. 6)
For the first 15 minutes EVERY time the fan is powered off and on (via the
isolator), the display will cycle between displaying the actual airflow rate (l/s) being
achieved* and system pressure (Pa). They will cycle every 10-20 seconds, where
the pressure will flash, and the airflow rate will be on constantly. The day logger
feature will only be displayed once, after the first cycle of displaying the flow rate
and system pressure.
*Airflow detection system must be enabled to display the calibrated flow rate.
4) System pressure detection
The fan can detect the system pressure for fault finding. If the fan seems noisy
or cannot achieve the desired flow rate, this could be due to a blocked duct or
the ducting has not been suitably stretched during installation (if flexible ducting
is used). This is displayed during the first 15 minutes EVERY time the fan is
powered off and on (via the isolator). The number is displayed in Pascals (Pa)
and the higher the number, the more torturous the system (and air path) – i.e.
harder for the fan to move the air through the ducting. As a consequence the
fan has to use more energy and it will increase the fans noise level.
The fan will maintain the correct airflow rate up to a maximum of 30Pa system
pressure. The system pressure will be different for all speeds, but worst on the
13l/s setting.
5) Calibration
The airflow sensor is calibrated at the factory using UKAS accredited
equipment. Details of the equipment and certification can be found on
the inside of the fan.
D. SERVICING AND MAINTENANCE.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST
BE ISOLATED FROM THE POWER SUPPLY DURING MAINTENANCE.
1. At intervals appropriate to the installation, the fan should be inspected and
cleaned to ensure there is no build up of dirt or other deposits.
2. Carefully pull the front panel off the inner grille. (fig. 4)
3. Wipe the inlets and front face with a damp cloth until clean. Be careful not to
push dirt into the airflow sensor.
The fan has sealed for life bearings, which do not require lubrication.
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