3 About the unit
Installation manual
6
D2C20ND0 D2C24ND035A5AA
Wall-mounted condensing boiler
3P469346-10J – 2018.05
3.3
Components
Components of models D2C20ND028A5AA and
D2C24ND035A5AA
a
b
c
d
e
f
g
h
i
j
k
z
l
m
n
o
p
q
r
s
t
u
v
w
x
y
a
Automatic air vent (heat exchanger)
b
Flow temperature sensor
c
Expansion vessel (10 litres)
d
Gas valve
e
Heat exchanger
f
3-way valve stepper motor
g
Domestic hot water temperature sensor
h
Plate heat exchanger
i
Safety valve (3 bar)
j
Condensate trap
k
Ignition transformer
l
Flue gas temperature sensor
m
Burnerhood
n
Ignition electrode
o
Ionisation electrode
p
High limit thermostat
q
Fan
r
Return temperature sensor
s
Silencer
t
Automatic air vent (pump)
u
Water pressure sensor
v
By-pass
w
Boiler pump
x
Domestic hot water flow sensor
y
Domestic hot water flow limiter
z
Flue gas adapter
