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DRAINING
Essential instruction 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 instruction for the electrical safety
Shut down the external electrical supply of the appliance before draining.
Essential instructions forthecorrect operation ofthesystem
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 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.
Figure 3
Cold water
Hot water
4
13
Vertical installation
on a wall
Horizontal installation
on a wall
1
1
2
3
(SL only)
Smart SL-SLEW: A1007850 - 661Y1700 • F - draft
Maintenance
33
EN
33


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