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DRAINING THE BOILER
Before draining the DHW tank, drain the heating (primary) circuit or bring its pressure
to 0 bar.
Water flowing out of the drain valve may be extremely hot and could cause severe
scalding. Keep people away from the hot water discharge.
Set-up conditions
Boiler switched o using the ON/OFF
master switch
External power supply isolated
Fuel/gas supply closed
Heating circuit draining procedure
1. Close the isolating valves (1).
2. Connect the drain valve (2) to the sewer
with a hose.
3. Open the drain valve (2) to empty the
heating circuit of the boiler.
4. Open the circuit air bleed valve (3) to
accelerate the draining process.
5. Close the drain valve (2) and the air bleed
valve (3) once the heating circuit of the
boiler is empty.
DHW circuit draining procedure
Before draining the DHW tank, make
sure that the heating (primary) circuit
pressure is null.
1. Open fully a draw-off tap (3) for about 60
minutes to make sure that the DHW tank
has cooled down.
2. Close the isolating valves (1).
3. Connect the drain valve (2) to the sewer
with a hose.
4. Open the drain valve (2) and drain the
DHW tank water to the sewer.
5. Open the draw-off tap (3) to accelerate the
draining process. If it is located lower than
the tank connection, open a draw-off tap
located higher in the system.
6. Close the drain valve (2) and the draw-off
tap (3) once the DHW tank of the boiler is
empty.
Cold water
Hot water
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EN
EN
32
BNE : 664Y6000 •D
MAINTENANCE
32


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