6
To remove the pullcord, cut the cord and leave the switch in place. There is no need
to switch the fan on/off beforehand.
8) System pressure detection (TP & HTP models)
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 highest on the 13l/s setting.
9) Fan silent running boost mode: This feature delays the boost operation for a maximum
of 20 minutes to reduce noise and cold drafts while bathing. After LS is disconnected,
the fan will look at the amount of time since the LS was activated and then run the fan on
boost for that same period or to a maximum of 20 minutes, whichever is shorter.
a. Dip switch 2 in the off position – Traditional mode (factory set) (fig. 5):
i. Standard running - with LS off, pullcord off. Fan continues to run on the set
trickle speed - 6 or 8l/s.
ii. When the integral pullcord is activated (TP & HTP model only), the fan will
run at 13l/s (boost) for a timed period.(Timer is adjustable on TP model,
but fixed to 15 minutes on the HTP model).
iii. When the LS is connected, the fan will run at 13l/s until deactivated (plus
overrun timed period where applicable).
b. Dip switch 2 in the on position:
i. Standard running – with the LS off, pullcord off. Fan continues to run on the
set trickle speed - 6 or 8l/s.
ii. When the integral pullcord is activated (TP & HTP model only), the fan will
boost as per “Traditional Mode” above.
iii. When the LS is activated, the fan will remain in trickle mode until the LS is
disconnected for a maximum of 20 minutes.
iv. After this 20 minute period or when the LS is disconnected (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.
v. However, if the LS is deactivated within 3 minutes of activation, then the
fan continues in trickle mode and does not boost.
10)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.
