6
8) System pressure detection (dMEV, 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.
