A.O. Smith Innovo 12-160, Installation, Service & Maintenance Manual

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8.9.5 Turn on the water heater
Refer to the procedure in the user part to Turn on the water heater (see section 4.2).
8.10 Decommisioning
To decommission the water heater:
Turn off the water heater (see section 8.10.1)
Drain the water heater (see section 8.10.2)
8.10.1 Turn off the water heater
Refer to the procedure in the user part to Turn off the water heater (see section 4.3) and
isolate the water heater from the mains power supply.
8.10.2 Draining
Refer to the installation diagram (see section 8.3) when you drain the water heater:
Close the manual gas valve (10).
If applicable, close the service stop valve (11) in the hot water pipe.
Close the stop valve (10).
Open the drain valve (9).
Aerate the entire installation of air until the water heater is completely drained.
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56 Installation, Maintenance and Service part