Underfloor Heating Requirements; Residual Pump Lift Graph; Connections; Piping Connections - Daikin D2CND024A4AB Installation Manual

4 Installation
For use of any additive in the central heating system, please refer to
the instructions of their manufacturers to ensure above functionality
and compatibility.
Water softening for domestic water circuit is recommended if
hardness of supply water is higher than 20°fH, in order to prevent
damage on boiler.
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.
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)
4.8

Connections

NOTICE
During installation, do not loosen or remove any screw
from bottom plate.
Installation manual
12
1000 1200 1400 1600 1800
B (l/h)
4.8.1

Piping connections

Piping connections of models D2CND024A1AB and
D2CND024A4AB
Below, find the piping connections of the unit.
H E G D F C
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 Filling valve (for D2CND024A1AB)
H Safety valve discharge
Below, find the piping connections of the unit.
h e g d f c
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 Filling valve
h Safety valve discharge
E D F B
a
D2CND024A1/4AB + D2TND012~024A4AB
B A
b a
A
b
Wall-mounted condensing boiler
3P469346-3N – 2019.11