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2 Appliance information
2.3 Appliance structure and components
Structure and components of models
D2CND028A1AA, D2CND028A4AA,D2CND035A1AA,
D2CND035A4AA
1
2
3
4
5
6
7
8
9
26
10
figure-6a, Structure and components of models D2CND028A1AA,
D2CND028A4AA, D2CND035A1AA and D2CND035A4AA
Key
1
Automatic air vent (heat exchanger)
2
Flow temperature sensor
3
Expansion vessel (10 litres)
4
Gas valve
5
Heat exchanger
6
3 way valve stepper motor
7
Domestic hot water temperature sensor
8
Plate heat exchanger
9
Safety valve (3 bar)
10 Condensate trap
11 Ignition transformer
12 Flue gas temperature sensor
13 Burnerhood
14 Ignition electrode
15 Ionization electrode
16 High limit thermostat
17 Fan
18 Return temperature sensor
19 Silencer
20 Automatic air vent (pump)
21 Water pressure sensor
22 By-pass
23 Boiler pump
24 Domestic hot water flow sensor
25 Domestic hot water flow limiter
26 Internal filling valve (Only in models D2CND028A1AA,
D2CND035A1AA)
Servicing manual
6
Structure and components of models
D2TND028A4AA, D2TND035A4AA
11
1
12
2
13
3
14
15
4
16
17
5
18
6
19
20
21
22
23
24
25
7
8
figure-6b, Structure and components of models D2TND028A4AA and
D2TND035A4AA
Key
1
Automatic air vent (heat exchanger)
2
Flow temperature sensor
3
Expansion vessel (10 litres)
4
Gas valve
5
Heat exchanger
6
3 way valve stepper motor
7
Safety valve (3 bar)
8
Condensate trap
9
Ignition transformer
10 Flue gas temperature sensor
11 Burnerhood
12 Ignition electrode
13 Ionization electrode
14 High limit thermostat
15 Fan
16 Return temperature sensor
17 Silencer
18 Automatic air vent (pump)
19 Water pressure sensor
20 By-pass
21 Boiler pump
D2CND028A1AA + D2CND028A4AA + D2CND035A1AA +
D2CND035A4AA + D2TND028A4AA + D2TND035A4AA
Wall-mounted condensing boiler
9
10
11
12
13
14
15
16
17
18
19
20
21
ESIE17 - 09 / 2017.11
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