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4 Installation
4.4
To mount the unit
1 The mounting template shows the position for the horizontal
flue. If there is no hole in the wall for the flue piping, drill one. If
there is already a hole in the wall for the flue piping, you can
use this hole as a starting point to determine the position of the
mounting bracket, according to the template. Flue duct must
incline 3° away from the unit, to allow the condensate to drain
back to the boiler.
>3°
2 Drill holes for the mounting bracket (Ø10 mm). Fasten the
mounting bracket to the wall according to mounting template.
3 Hang the unit on the bracket. Make sure the unit is latched to
the bracket.
Installation manual
10
>3°
200
200
d=10 mm
4.5
Central heating system
requirements
Expansion vessel sizing
The boiler is equipped with an 8 litre expansion vessel that has initial
charge pressure of 1 bar.
Sufficiency of the incorporated expansion vessel for the central
heating circuit that the boiler is to be connected to depends on
system charge pressure and water temperature circulating in the
circuit.
Determination of system water height and related system charge
pressure are given below:
h
System water height (m)
p
System charge pressure (bar)
According to the graph below, there is no need to install an
additional expansion vessel for the systems with a water volume in
the area below the operating temperature curve. If water volume is
above the curve, additional vessel must be installed, preferably on
the return to the boiler.
A (l)
350
300
250
200
150
100
50
0
0.8
0.9
1.0
1.1
A
System water volume (l)
B
System charge pressure (bar)
*
50°C-40°C temperature regime is given for underfloor
heating systems
Water treatment
Inappropriate central heating circuit water reduces functionality and
efficiency of the boiler over time. Appropriate water should have:
▪ pH degree between 6.5 and 8.5
▪ Hardness less than 15°fH and 8.4°dH
Appropriate additives can be used for water treatment.
If antifreeze is needed for the system, the chosen antifreeze should
not interact with rubber, commercial plastic and metal parts of the
boiler that are in contact with the central heating water.
For use of any additive in the central heating system, please refer to
the instructions of their manufacturers to ensure above functionality
and compatibility.
WARNING
Mixing inappropriate additives with the central heating
circuit water can result in efficiency loss in the boiler or
damage to the boiler and the other central heating circuit
elements. Daikin accepts no liability for any such damage
or ineffectiveness caused by using inappropriate additive.
D2C18ND024A5AA + D2HND012/18A5AA
h
p
≤6 m
0.8 bar
7 m
0.9 bar
8 m
1.0 bar
9 m
1.1 bar
10 m
1.2 bar
11 m
1.3 bar
12 m
1.4 bar
13 m
1.5 bar
1.2
1.3
1.4
1.5
B (bar)
Wall-mounted condensing boiler
3P469346-9J – 2018.05
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