DRAINING
Essential instruction forthe 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 instruction for the electrical safety
• Shut down the external electrical supply of the appliance before draining.
Essential instructions forthecorrect operation ofthesystem
• 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 primary circuit byclosing 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 thewater from the primary circuit tothedrain.
5. Open the tank’s air bleed valve (3) toaccelerate 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. Toaccelerate 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.
SLE - SLE Plus: A1007847 - 661Y2100 • D
Maintenance
Cold water
Hot water
Figure 3
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2
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