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DRAINING
Essential instructions forthe safety of persons and the environment
The water coming out of the drain valve is very hot and can cause very severe
burns. Make sure the area around the hot water flow is clear of people.
Essential instructions for the electrical safety
Shut down the external electrical supply of the installation before draining.
Essential instructions forthecorrect operation oftheinstallation
Drain the tank if it is not used in winter and is at risk from exposure to ice. If the
primary circuit water contains antifreeze, only the DHW tank must be drained. If
the heating circuit does not contain antifreeze, the heating circuit and domestic
water must be drained.
Before draining the DHW, isolate the tank and lower the pressure of the heating
circuit to 1 bar, in order to prevent the DHW tank from being crushed.
DRAINING THE PRIMARY CIRCUIT Figure 3
To drain the primary circuit of the hot water heater:
1. Stop the charging pump.
2. Isolate the hot water primary circuit byclosing the stop valves (1).
3. Connect the drain valve (2) to the sewer using a flexible hose.
4. Open the drain valve (2) and drain thewater from the primary circuit tothedrain.
5. Open the tank’s air bleed valve (3) toaccelerate drainage.
6. Close the drain valve (2) and air bleed valve (3) after draining the tank.
DRAINING THE DHW TANK Figure 4
To drain the hot water heater’s DHW tank:
1. Open fully the hot water tap (3) for at least 60 minutes to make sure the DHW tank has
cooled down sufficiently.
2. Close the filling valve (1) and the stop valve (4).
3. Connect the drain valve (2) to the sewer using a flexible hose.
4. Open the drain valve (2) and drain the water from the DHW tank to the sewer.
5. To accelerate the tank’s drainage, open a hot water tap located higher than the tank
connection in the DHW circuit.
6. Close the drain valve (2) and the hot water tap (3) after having drained the DHW tank.
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MAINTENANCE
BRINGING BACK INTO SERVICE AFTER MAINTENANCE
Refer to chapter "Starting Up", page 19
24


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