E (°C)
TIME (sec)
DUA 35 B 60DOMESTIC HOT WATER PRODUCTION
DRAW-OFF
12 l/min
The routing of the piping has to be laid down taking all the
necessary precautions in order to avoid air locks and to faci-
litate the continuous purging of the system.
Ensure yourself that the system’s piping is not used as
earth clamps for the electrical or telephonic system. They
are absolutely unsuitable for this use. In a short time this
could cause serious damage to the piping, boiler and ra-
diators.
Pressure relief valve drain pipe
In correspondence to the heating pressure re-
lief valve, provision should be made to install
a discharge pipe with a funnel and a siphon
which lead to an adequate drainage. The drai-
nage has to be controllable by sight.
WARNING!
If this precaution is not taken it could lead to
injury to persons, animals or damage to pro-
perty. The manufacturer shall not be held lia-
ble for any such injury and/or damage
3.8 - CENTRAL HEATING CONNECTIONS
WARNING!
Before installing the boiler we recommend
that the system is flushed out with a suitable
product in order to eliminate any metallic to-
oling or welding residues, oil and grime whi-
ch could reach the boiler and affect the pro-
per running of the boiler.
Do not use any solvents for flushing out the
system as they could damage the system
and/or its components.
Non-observance of these instructions could
cause injury to persons, animals or damage
to property. The manufacturer shall not be
held liable for any such injury and/or dama-
ge.
The CH flow and return circuits have to be connected to the
boiler via the respective connections ¾” M and R as indica-
ted on page 16
When determining the size of the CH circuit pipes it is essen-
tial to bear in mind the pressure losses induced by the radia-
tors, any eventual thermostatic radiator valves, lockshield
valves and by the system’s layout.
COLD WATER INLET 9°C
COLD WATER INLET 9°C
65
60
55
50
45
40
35
30
0
70
60 120 180 240 300 360 420 480 540 6000
TEMPE
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