4 Installation
Installation manual
17
D035A1/4AA + D035A4AA
Wall-mounted condensing boiler
3P469346-5E – 2017.06
Symbols:
Item
Description
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
Description
PCB1
—
Main PCB
PCB2
X3
Status indicator PCB
PCB3
X9
LAN (var iCAN) adapter
P1
X2-X11
Boiler pump
F1
X1-X11
Fan
GV1
X11
Gas valve
IT1
X1
Ignition transformer
3WV1
X13
Central heating / domestic hot
water diverter valve stepper
motor
WPS1
X4
Water pressure sensor
DHW FS1
X4
Domestic hot water flow sensor
(for models D2CND*)
IE1
X5
Ionisation input
K1
X2M
Solar stop contact
K2
X2M
On/OFF room thermostat
HE1
X11
Overheat thermostat
NTC1
X1M
Outdoor temperature sensor
NTC2
X4
Flow temperature sensor
NTC3
X4
Return temperature sensor
NTC4
X4
Flue temperature sensor
NTC5
X4
Domestic hot water temperature
sensor
(for models D2CND*)
NTC5
X1M
Domestic hot water storage tank
sensor
(for models D2TND*)
NTC6
X1M
Solar domestic hot water
temperature sensor
Ext1
X8
BCC (Boiler Chip Card)
Ext2
X10
Personal computer production
interface
Ext3
X1M
Opentherm room thermostat
Ext4
X2M
External power output
(230 V AC)
Ext5
X2M
Reserved, not in use
X1M
X4-X11-X12
Low voltage terminal strip
X2M
X1-X2
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:
