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iii. When the LS is connected, the fan will run at 13l/s until deactivated
b. Dip switch 2 in the on position:
i. Standard running – with the LS off, pullcord off. Fan continues to run
ii. When the integral pullcord is activated, the fan will boost as per
iii. When the LS is activated, the fan will remain in trickle mode until the
iv. After this 20 minute period or when the LS is disconnected
v. However, if the LS is deactivated within 3 minutes of activation, then
9) 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.
E. TROUBLESHOOTING
1. Fan continuously speeds up and down:
a. Cause:
i. This usually means the fan cannot stabilise at the desired airflow rate.
ii. This could be due to the ducting being blocked, or being very windy.
b. Solution:
i. If this persists after the ducting has been checked or the property is
2. The fan continuously runs in boost (HTP model only):
a. Cause:
i. The room is damp or recently redecorated.
(plus overrun timed period where applicable).
on the set trickle speed - 6 or 8l/s.
"Traditional Mode" above.
LS is disconnected for a maximum of 20 minutes.
(whichever happens first), the fan will change to 13l/s (boost mode)
and continue to run on boost for the same period as between the LS
activation and deactivation, up to a maximum of 20 minutes.
the fan continues in trickle mode and does not boost.
very exposed to high winds, it is recommended to turn the airflow
detection system off. (Section C2)
6
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