4 Installation
Installation Manual
15
D2CNL024A1AA
Wall-mounted condensing boiler
3P469346-12R – 2021.09
Symbols:
Item
Description
Option
Wiring depending on model
Switch box
PCB
Earth wiring
15
Wire number 15
Legend:
Part
Connector
Description
PCB1
—
Main PCB
P1
X1A - X11
Boiler pump
F1
X6A -X11
Fan
GV1
X12
Gas valve
IT1
X12
Ignition transformer
3WV1
X10
Central heating / domestic hot
water diverter valve motor
WPS1
X7
Water pressure sensor
DHW FS1
X2
Domestic hot water flow sensor
IE1
X12
Ionisation input
K1
X1M
On/Off room thermostat
HE1
X2
Overheat thermostat
NTC1
X1M
Outdoor temperature sensor
NTC2
X4
Flue temperature sensor
NTC3
X4
Return temperature sensor
NTC4
X4
Flow temperature sensor
NTC5
X7
Domestic hot water temperature
sensor
Ext2
X2M
Power supply cable
Ext3
X2M
External power output
(230 V AC)
WARNING
External power output should ONLY be used for optional
parts supplied by manufacturer, according to the
instructions provided within the manual of optional parts.
Failure to observe this warning will void the warranty. The
manufacturer is NOT responsible for any damage that may
occur this way.
4.8.7
Guidelines when connecting the
condensate piping
DANGER
In order to prevent escape of flue gases and so poisoning,
the condensate trap must be mounted to its place before
commissioning.
Condensate trap must be connected to a drain via an open
connection.
Precautions that should be taken about condensate piping are:
▪ Horizontal pipe runs must fall a minimum of 45 mm/metre.
▪ External piping should be kept as short as possible or thermally
insulated to prevent freezing, depending on the installation winter
climate condition.
▪ Make sure that the condensate disposal system, the piping, and
the fittings are made of acid resistant material like plastics.
WARNING
The condensate trap outlet shall NOT be modified or
blocked.
CAUTION
The condensate discharge piping diameter must be large
enough so as not to restrain the condensate water flow.
WARNING
If the discharge pipe is located outdoors, take measures
against frost.
4.8.8
Guidelines for condensate piping
termination
Condensate piping can be connected to a termination in different
ways shown below:
Terminating into an internal soil and vent stack
b
a
≥450 mm
a
Air breaker
b
Internal soil and vent stack
Terminating into an external waste system
a
a
Open end direct into gully, below ground but above water
level
Terminating into an external purpose made soakaway
a
b
