DRAINING THE BOILER
Essential recommendations for safety
•
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 off 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.
Close the drain valve (
2
) 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
1
1
2
1
2
3
DRAINING THE WATER HEATER
Essential recommendations for safety
•
Before draining the DHW tank, drain the 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
•
Water heater switched off using the ON/OFF master switch
•
External power supply isolated
•
Gas supply closed
Primary circuit draining procedure
1.
Make sure the isolating valve (1) is closed.
2.
Connect the drain valve (2) to the sewer with a
hose.
3.
Open the drain valve (2) to empty the primary
circuit of the water heater.
4.
Close the drain valve (2) once the primary circuit
of the water heater is empty.
1
2
The drain valve is located underneath and
the front cover of the base needs to be
removed to get access to it.
WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
en
44
EN
FR
NL
ES
IT
DE
PL
RU
MAINTENANCE
REMOVAL AND INSTALLATION OF THE BURNER
Set-up conditions
•
Water heater shut down
•
External power supply isolated
•
Gas supply closed
•
Front and top panels removed (refer to “Removal and Installation of the Front and Top Panels” on
page 39).
•
Electrode removed or electrode grounding cable and ignition cable disconnected (refer to “Removal,
Check and Installation of the Burner Electrode” on page 46) .
Removal procedure
1.
Disconnect all plugs from the fan assembly (
10
) and the gas valve (
2
) and any grounding cable, as
required.
2.
Disconnect the air inlet elbow (
3
).
3.
Release the gas connection (
1
).
4.
Using a socket wrench, release the burner hood (
9
) attaching hex. screws and retain them for rein-
stallation.
5.
Lift the burner assembly and pull it out of the exchanger.
6.
If required, clean the exchanger, see “Cleaning the Exchanger” on page 46.
7.
If not removed previously, remove, check and reinstall the electrode, refer to “Removal, Check and
Installation of the Burner Electrode” on page 46.
Installation procedure
1.
Reinstall the burner assembly with its insulation block into the exchanger.
2.
Install the retaining screws of the burner hood (
9
) and fasten them in a crosswise pattern at the
required tightening torque (refer to “Torque Values” on page 46).
3.
Reconnect the gas connection (
1
).
When connecting the air inlet, make sure that the check valve (4) is correctly located at the
elbow (3) end.
4.
Reconnect the air inlet elbow (
3
).
5.
Reconnect the plugs to the gas valve (
2
) and the fan assembly (
10
), and any disconnected ground-
ing cable.
Follow-on tasks
1.
Install the electrode, or reconnect the electrode grounding cable and ignition cable, as required.
Refer to “Removal, Check and Installation of the Burner Electrode” on page 46.
