4 Description of the product
4.1
Operating principle
4.1.1
Description of the function of the air pressure monitor
1
Air pressure monitor
2
Venturi
During pre-purge, the air pressure switch (differential pressure switch) is
interrogated. If the factory-set differential pressure of 6 mbar between
measuring points 1 and 2 is not reached, the lockout occurs (error
message "162 Air pressure switch") and the boiler is locked.
Possible causes:
blocked siphon
blocked flue gas pipe
blocked air filter
blocked suction pipe
For more information, see
4.2
Main components
4.2.1
Boiler
1 Flue gas connection
2 Boiler flow (KV)
3 Safety group connection
4 Boiler return (KR)
5 Air supply duct
6 Gas connection
7 Boiler control LMS
8 Ignition transformer (below the control unit)
9 Ionization electrode
10 Flame inspection window (below the control unit)
11 Fan
12 Ignition electrode block
13 Venturi
14 Air pressure monitor
15 Gas valve
16 Heat exchanger
17 Flue gas silencer
18 Pressure sensor
19 Fill and drain valve
20 Cleaning cover
21 Siphon
Fig.4
Connection of the air pressure
monitor (schematic)
RA-0001301
1
2
Fig.5
Boiler view EC five 125 kW - 170
kW
RA-0000211
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
20
17
19
21
4 Description of the product
7703301 - 01 - 16072018
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