4 Installation
Installation manual
24
D035A1/4AA + D035A4AA
Wall-mounted condensing boiler
3P469346-5E – 2017.06
Flue part
Order code
90° elbow 60 mm
DR90ELBOW60AA
45° elbow 60 mm
DR45ELBOW60AA
Extension duct 60 mm
500 mm
DREXDUC0500AA
1000 mm
DREXDUC1000AA
B33 flue kit
DRB33FLUKITAA
4.9
To fill the system with water
CAUTION
Water filling must be done while the boiler is in standby
mode.
Method 1
(For models D2TND028A4AA and D2TND035A4AA)
a
1
2
3
4
6
7
5
E
D
F
B
A
a
Use a disconnector or a double check valve according to
local regulations.
After all system connections are performed with care, perform the
following steps:
1
Connect the appliance to the main power supply. Due to low
pressure, error code "Err HJ-09" will appear on the user
interface and the status indicator light will be red.
2
Open
all radiator valves
.
3
Set
all isolating valves
to closed position.
4
Connect fresh water supply pipe to
valve 5
.
5
Open
valves 1, 2, 3, 4, 5, 6
.
6
Slowly turn the
valve 7
to open position until pressure reaches
a value around 0.8 bar for system heights up to 6 metres. For
longer system heights, see
to determine filling pressure. Filling
operation should be done slowly. When pressure exceeds
0.8 bar, error code will disappear and the status indicator light
will turn to blue. Turn the
valve 7
off.
7
Turn the
valve
5 off. Remove the filling loop if it is required by
local regulations.
8
Check the central heating circuit - especially the couplings of
the circuit - for leakage.
9
Make sure the automatic air vent valves located on the pump
and heat exchanger are opened. Vent the air from the
installation with the manual air vent screws on the radiators.
Make sure screws are tightened after venting.
10
If after the venting the pressure decreases below 0.8 bar, refill
with water until the pressure reaches 0.8 bar again.
11
Isolate the appliance from power mains.
Method 2
(For model D2CND028A4AA and D2CND035A4AA)
E
1
2
4
3
6
5
D
F
B
7
a
8
A
a
Use a disconnector or a double check valve according to
local regulations.
After all system connections are performed with care, perform the
following steps:
1
Connect the appliance to the main power supply. Due to low
pressure, error code "Err HJ-09" will appear on the user
interface and the status indicator light will be red.
2
Open all
radiator valves
.
3
Set all
isolating valves
to closed position.
4
Connect the filling loop to the
valve 7 and valve 8
.
5
Set
valves 1, 3, 5, 6 and 8
to open position.
6
Slowly open the
valve 7
until pressure reaches a value around
0.8 bar for system heights up to 6 metres. For longer system
heights, see
"4.5 Central heating system requirements" on
to determine filling pressure. Filling operation should
be done slowly. When pressure exceeds 0.8 bar, error code will
disappear and the status indicator light will turn to blue. Turn
the
valve 7
off.
7
You can monitor the system pressure value from the user
interface.
8
Make sure the automatic air vent valves located on the pump
and heat exchanger are opened. Vent the air from the
installation with the manual air vent screws on the radiators.
Make sure screws are tightened after venting.
9
If after the venting the pressure decreases below 0.8 bar, refill
with water until the pressure reaches 0.8 bar again.
10
Set
valve 8
to off position. Remove the filling loop if it is
required by local regulations.
11
Check the central heating circuit - especially the couplings of
the circuit - for leakage.
12
Isolate the boiler from power mains.
Method 3
(For model D2CND028A1AA and D2CND035A1AA)
After all system connections are performed with care, perform the
following steps:
1
Connect the unit to the main power supply. Due to low
pressure, error code "Err HJ-09" will appear on the user
interface and the status indicator light will be red.
2
Open all radiator valves.
3
Set all isolating valves to vertical (open) position.
4
Measure system water height (see
5
Slowly turn the filling valve until pressure reaches a value
around 0.8 bar for system heights up to 6 metre. For longer
system
heights,
see
to determine filling pressure. Filling
