4 Installation
Symbols:
Item
Option
Wiring depending on model
Switch box
PCB
X4M
Main terminal
Earth wiring
15
Wire number 15
Field supply
1
Several wiring possibilities
Legend:
Part
Connector
PCB1
—
PCB2
X3
PCB3
X9
P1
X2-X11
F1
X1-X11
GV1
X11
IT1
X1
3WV1
X13
WPS1
X4
DHW FS1
X4
IE1
X5
K1
X2M
K2
X2M
HE1
X11
NTC1
X1M
NTC2
X4
NTC3
X4
NTC4
X4
NTC5
X4
NTC5
X1M
NTC6
X1M
Ext1
X8
Ext2
X10
Ext3
X1M
Ext4
X2M
Ext5
X2M
X1M
X4-X11-X12
X2M
X1-X2
Installation manual
16
Description
Description
Main PCB
Status indicator PCB
LAN (var iCAN) adapter
Boiler pump
Fan
Gas valve
Ignition transformer
Central heating / domestic hot
water diverter valve stepper
motor
Water pressure sensor
Domestic hot water flow sensor
(for models D2C*)
Ionisation input
Reserved, not in use
On/OFF room thermostat
Overheat thermostat
Outdoor temperature sensor
Flow temperature sensor
Return temperature sensor
Flue temperature sensor
Domestic hot water temperature
sensor
(for models D2C*)
Not in use
Solar domestic hot water
temperature sensor
BCC (Boiler Chip Card)
Personal computer production
interface
Daikin room thermostat
External power output
(230 V AC)
Reserved, not in use
Low voltage terminal strip
High voltage terminal strip
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
a
b
≥450 mm
a
Air breaker
b
Internal soil and vent stack
Terminating into an external waste system
a
Open end direct into gully, below ground but above water
level
D2C18ND024A5AA + D2HND012/18A5AA
a
Wall-mounted condensing boiler
3P469346-9J – 2018.05