Daikin D2C20ND028A5AA Manuel D'installation page 18

4 Installation
60/100 Vertical flue length can be increased up to 20.7 metres by
adjusting the parameter C3 to 5 from the user interface. Refer to
servicing instructions for this operation.
80/125 Vertical flue length can be increased up to 99 metres by
adjusting the parameter C3 to 5 from the user interface. Refer to
servicing instructions for this operation.
Subtract equivalent length value of bends from the allowable flue
length value.
80/125 mm flue system
To increase the maximum allowable flue duct length, 80/125 mm
concentric flue ducts can be used instead of 60/100 mm. In this
case, C13x and C33x flue systems should start with a 60/100 to
80/125 adapter coupled to the flue outlet.
a
a 60/100 to 80/125 adapter
80/125 flue parts to be used are shown below:
a b
a 80/125 wall terminal kit (type C13)
b 80/125 roof terminal kit (type C33)
c 90° elbow 80/125
d 45° elbow 80/125
e 30° elbow 80/125
f Extension 80/125
L = 500-1000 mm
Type C43x (concentric flue system)
Several heat sources draw combustion air from the outside through
the annular gap of the room sealed balanced flue system and expel
flue gas to the outside via the roof, through a moisture-resistant
internal pipe.
The multi-served chimney is a system that is part of the building and
has a separate CE marking. The connection between the boiler and
the shaft and, the connection between the boiler and the air intake
system must be obtained via Daikin.
Installation manual
18
c d e f
a b c d
a Tee flex boiler connection set 100 or 130
b Extension 60 mm
c Chimney connection 60/100
d Elbow 60/100 90°
Optional:
e 90° elbow 60/100
f 45° elbow 60/100
g Inspection elbow 60/100
h 30° elbow 60/100
i Extension 60/100
L = 500-1000 mm
Maximum allowable length of the flue duct up to common
chimney is 2 metres + 1 60/100 90° elbow.
In C43x type units, condensate flow into the unit is not allowed.
Type C63x (concentric flue system)
To install the boiler as a C63x option the following data must be
used to determine the correct diameters and lengths of the flue
system.
for D2C/T...ND028
▪ Nominal combustion products temperature: 83.4°C
▪ Combustion products mass flow rate: 12.35 g/s
▪ Overheat combustion products temperature: 92.2°C
▪ Minimum combustion products temperature: 30.8°C
▪ Maximum allowable pressure difference between combustion air
inlet and flue gas outlet (including wind pressures): 135 Pa
for D2C/T...ND035
▪ Nominal combustion products temperature: 88.4°C
▪ Combustion products mass flow rate: 15.47 g/s
▪ Overheat combustion products temperature: 99.5°C
▪ Minimum combustion products temperature: 31.2°C
▪ Maximum allowable pressure difference between combustion air
inlet and flue gas outlet (including wind pressures): 185 Pa
for D2C/T...ND028 and D2C/T...ND035
▪ Minimum combustion products mass flow rate: 2.2 g/s
▪ CO content at nominal heat input: 8.8%
2
▪ Maximum allowable draught: 50 Pa
▪ The boiler must be connected to a system with the following
characteristics: T120 P1 W
▪ Maximum allowable temperature of combustion air: 50°C
▪ Maximum allowable recirculation rate under wind conditions is
10%
▪ The terminals for the supply of combustion air and for the
evacuation of combustion products shall not be installed on
opposite walls of the building.
▪ Condensate flow into the unit is allowed.
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D2C20ND028A5AA + D2C24ND035A5AA
Wall-mounted condensing boiler
3P469346-10J – 2018.05
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