Underfloor Heating Requirements; Residual Pump Lift Graph; Connections; Piping Connections - Daikin D2C20ND028A5AA Manuel D'installation

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.
A (mbar)
800
700
600
500
400
300
200
100
0
0 200 400 600 800
A Residual pump lift (mbar)
B Flow (l/h)
D2C20ND028A5AA + D2C24ND035A5AA
Wall-mounted condensing boiler
3P469346-10J – 2018.05
1000 1200 1400 1600 1800
B (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 D2C20ND028A5AA and
D2C24ND035A5AA
Below, find the piping connections of the unit.
G E D F C B A
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
E D F
B
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 D2C20ND028A5AA
andD2C24ND035A5AA. 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.
4 Installation
A
b
Installation manual
11