D2CND0 D2CND0 D2CND0
D2CND0 D2TND0 D2TND035A4AA
Wall-mounted condensing boiler
ESIE17 - 09 / 2017.11
Servicing manual
5
Pump anti-blockage system:
The pump operates for 30 sec
-
onds every 24 hours during long periods of inactivity to ensure
it does not get stuck. To enable this function, the appliance
must be connected to the power supply.
Three-way valve anti-blockage system:
In cases where the
appliance is non-operational for prolonged periods of time,
the three-way valve switches its position every 24 hours to
prevent it from getting stuck. To enable this function, the appli
-
ance must be connected to the power supply.
Safety against dry operation:
This is controlled by the pres
-
sure sensor. It turns off the appliance and ensures system
safety when the water pressure of the heating installation falls
below 0.6 bar for any reason.
Flame ionisation control:
This is controlled by the ionisa-
tion electrode. It checks whether a flame forms on the burner
surface or not. If there is no flame, it turns the appliance off to
stop gas flow and warns the user.
High pressure protection:
Pressure Sensor:
When heating system pressure reaches
2.8 bar, control unit stops heating operation thus preventing
the pressure from rising.
Safety valve:
When the water pressure of the heating circuit
exceeds 3 bar, some water is automatically drained from the
safety valve to keep the pressure below 3 bar thus protecting
the boiler and heating installation.
Automatic air vents:
There are two air vents; one on the
pump, other on the heat exchanger. They help discharging
the air inside the installation and heating circuit to avoid air
traps and consequent operational problems.
Frost protection safety system:
This function
protects the appliance and heating installation from frost
damages. It is controlled by the flow temperature sensor which is
located at the outlet of the main heat exchanger. This protection
activates the boiler pump when the water temperature drops
below depends on P03 parameter value and it activates the
burner when the water temperature drops below depends
on P03 parameter value. The appliance keeps running until
the temperature reaches 20°C. To enable this function, the
appliance must be connected to the power supply and its main
gas valve must be open. Any damage caused by frost is not
covered by the warranty.
Low voltage safety system:
This is controlled by the control
unit. When the supply voltage drops below 170 Volt, the boiler
goes to error mode. It is a blocking error and the boiler will
operate without reset after supply voltage is above 180 Volt. It
is recommended to use a voltage regulator of suitable power
and type in locations with voltage fluctuations below this limit
for faultless operation.
High electric supply current protection system:
A fuse
on the control unit protects equipment and wiring against
the damaging effects of electrical faults which cause excess
currents, and to disable equipment which is faulty. The fuse
“blows” (opens) when the current carried exceeds the rated
value for an excessive time.
Automatic by-pass system:
This ensures that the flow is at
all times continued, to avoid overheating of the heat exchang
-
er. This system is also supported with a special by-pass func
-
tion in the control unit software.
2.2 Dimensions
Ø
Top View
784.
5
695.
5
294.4
Front View
Right Side View
90
65
65
68
65
37.5
125
132
180
Bottom View of Model D2CND028A1AA D2CND035A1AA
90
65
65
68
65
37.5
125
132
180
90
30
100
103
30
125.
7
72
132
180
182.5
Bottom View of Model D2CND028A4AA D2CND035A4AA
Bottom View of Models D2TND028A4AA, D2TND035A4AA
2 Applience information
Summary of Contents for D2CND028A1AA
Page 43: ......
