4 Installation
Installation manual
11
D2C18ND0 D2HND012/18A5AA
Wall-mounted condensing boiler
3P469346-9J – 2018.05
4.6
Underfloor heating requirements
Underfloor heating systems apparently require higher flow rate and
lower ΔT. This boiler can be connected to an underfloor heating
system without use of a second pump and low loss header because
of its high pump capacity. Direct connection is possible when the
system is well designed and pressure loss is low enough.
When the boiler is connected to underfloor heating installation, the
maximum central heating set temperature must be limited to 50°C
and the pump operation temperature difference must be adjusted to
10 Kelvin in the service settings menu. To change this setting, refer
to the servicing instructions.
WARNING
Make sure parameter changes explained above are done
to avoid discomfort of the user.
4.7
Residual pump lift graph
The residual pump lift graph shows the amount of pump lift (mbar)
that remains for the central heating circuit.
0
0
100
200
300
400
500
600
700
800
200
400
600
800
1000
1200
1400
1600
1800
A (mbar)
B (l/h)
A
Residual pump lift (mbar)
B
Flow (l/h)
4.8
Connections
NOTICE
During installation, do not loosen or remove any screw
from bottom plate.
4.8.1
Piping connections
Piping connections of model D2C18ND024A5AA
Below, find the piping connections of the unit.
E
G
D
B
A
C
F
A
Central heating return connection, 3/4"
B
Domestic cold water inlet connection, 1/2"
C
Condensate trap discharge
D
Domestic hot water outlet connection, 1/2"
E
Central heating supply connection, 3/4"
F
Gas inlet connection, 3/4"
G
Safety valve discharge
B
F
D
a
b
E
A
Valve
Strainer
Tee connection
Double check valve + filling hose
Disconnector
a
Isolation valve on domestic hot water supply pipe is
tentative.
b
External filling group used with model D2C18ND024A5AA.
Use a disconnector or a double check valve according to
local regulations.
Isolation valves and strainers should be used just before the
appliance piping inlet as shown in figure above.
Ensure that necessary gaskets are placed.
Note:
Optional Daikin connection kit can be used and it is
recommended to use it.
