en
23
HR i
: A1002237 - 661Y1300 • B
EN
FR
NL
ES
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DE
PL
RU
EN
MAINTENANCE
DRAINING THE PRIMARY CIRCUIT (Figure 3)
Before draining the DHW circuit, isolate the tank and lower the pressure of the primary
circuit to 1 bar, in order to prevent the DHW tank from being crushed.
To drain the primary circuit of the hot water heater:
1.
Isolate the water primary circuit by closing the stop valves (
1
).
2.
Connect the drain valve (
3
) to the sewer using a flexible hose.
3.
Check that valve (
5
) is open, then open the drain valve (
3
) and drain the water from the
primary circuit to the drain.
4.
Open the tank’s air bleed valve (
4
) to accelerate drainage.
5.
Close the drain valve (
3
), valve (
5
) and air bleed valve (
4
) after draining the primary tank.
Figure 3
4
3
1
1
2
5
1
Cold water
Hot water
