Operation Manual

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

BNE : 664Y6000 •D

MAINTENANCE