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4 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)
4.8
Connections
4.8.1
Piping connections
Piping connections of models D2CND028A1AA,
D2CND028A4AA, D2CND035A1AA and D2CND035A4AA
Below, find the piping connections of the unit.
H
E
G
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
Filling valve (for D2CND028A1AA and D2CND035A1AA)
Installation manual
12
1000
1200
1400
1600
1800
B (l/h)
H
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 D2CND028A4AA
and D2CND035A4AA. 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.
Piping connections of models D2TND028A4AA and
D2TND035A4AA
Below, find the piping connections of the unit.
G
E
D
F
C
A
Central heating return connection, 3/4"
B
Storage tank return connection, 3/4"
C
Condensate trap discharge
D
Storage tank supply connection, 3/4"
E
Central heating supply connection, 3/4"
F
Gas inlet connection, 3/4"
G
Safety valve discharge
D2CND028+035A1/4AA + D2TND028+035A4AA
A
b
A
B
Wall-mounted condensing boiler
3P469346-5E – 2017.06
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