18
6.2.2. Adjusting fl ow rate with differential
pressure gauge
S&P recommends a slight underpressure in the house
e.g. less supply airfl ow then extract airfl ow.
1. Lose screws Torx 10 (20) (Arrow 1).
2. Remove cover (21) (Arrow 2).
NOTE
The fi rst step is always to set the airfl ow rate for ex-
tract air.
3. Set up power supply for the ventilation system.
4. Turn on fan speed V3 on the control panel, see page
30.
Pa
XXXX
1
29
46
27
A 40
M+P-26A-2065
5. Connect differential pressure gauge (29) to the di-
fferential pressure connecting piece 1 (46) and
take a reading of the differential pressure [Pa].
Pay attention to the correct connection of + and -
(+/+ and -/-).
6. Turn potentiometer (27) until the desired differential
pressure (= airfl ow rate) is displayed on the differen-
tial pressure gauge (29).
Take value from the following table.
Example:
1. The desired airfl ow rate (extract air) is 110 m³/h.
2. Look for the value 110 in the table.
3. Turn potentiometer (27) until 7.5 Pa is displayed on
the differential pressure gauge (29).
Nominal airfl ow
rate (extract air)
[m³/h]
Differential pressure connecting
piece 1/ potentiometer (27)
[Pa]
90 15-16
100 18-20
110 22-23
120 25-28
130 31-34
140 37-39
150 41-43
160 45-47
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