Electrical Connection; Humidity Adjustment - SystemAir BF 120 Installationsanleitung

Assembly
For best results the extractor fan should be fitted as
high on the wall as possible, or on the ceiling. It
must not be installed in a shower cabin, or be
accessible to a person using either the shower or
the bath. Precaution must be taken to avoid back-
flow of gases from the the open flue of gas or other
open-fire appliance when mounted in the outside
windows or walls.
1. Remove the two small screw caps on the
front, remove the screws and the front
cover.
2. Hold the body of the fan against the wall
(or ceiling) and mark the screw holes and
the cable entry.
3. Make sure the fan is square on the wall
(or ceiling) and fasten it.
4. Make the electrical connections
according to instructions below.
5. Put the front cover back on.

Electrical connection

Switch off mains supply before making any
electrical connections.
The extractor fan must be installed by authorized
personnel only. The wiring should be fixed and the
fan must be preceded by an all-pole breaker with a
contact gap of at least 3 mm. The fans are double
insulated and do not require an earth.
The fan can be connected to the light switch,
so that it will start when the light is switched
on, or to a separate switch.
Trim the cable (see the drawing below),
remove the internal cover plate and make the
connections according to the wiring diagram.
6mm
9mm
Fig 1. Trimming the cable.
4
Timer adjustment
(BF 120 T and BF 120 TH)
The time delay can be set from 1 minute to
20 minutes.
Setting the timer
1. Switch off mains supply.
2. Remove the front cover and the inner
cover plate.
3. Insert a small screwdriver into the slot
and turn clockwise to reduce the delay
time and anti-clockwise to increase it.

Humidity adjustment

(BF 120 TH)
The fan will stop when the time delay is
switched off at the pre-set time. If the
humidity is higher than the pre-set level, the
fan will start again and run until the humidity
falls to below 5%. The sensitivity can be
adjusted from 40 to 95%. Suitable level is
often 70-80%.
Setting the humidity level
Use the knob at the bottom of the fan.
20
30
40
Fig 3. Humidity adjustment (viewed from
below).
80
70
60
50