A.O. Smith BFC Cyclone 28, Инструкция по установке, эксплуатации и обслуживанию

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Switch the water heater OFF (position 0) using the control switch on the operator
interface.
Isolate the water heater from the power supply by setting the isolator between the
water heater and the mains power supply to position 0.
Shut off the gas supply (10).
Close the stop valve (11) in the hot water pipe.
Close the supply valve (4) in the cold water inlet (A).
Open the drain valve (9).
7.9.2.2 Draining vented installations
Some service activities require the water heater to be drained. The procedure is as
follows:
Activate the MENU with [ ].
Position the cursor in front of OFF.
Confirm OFF with [ENTER].
Wait until the fan has stopped. The icon is then dimmed.
Caution
Failure to wait until the fan stops can cause damage to the water heater.
Switch the water heater OFF (position 0) using the control switch on the operator
interface.
Isolate the water heater from the power supply by setting the isolator between the
water heater and the mains power supply to position 0.
Shut off the gas supply (10).
Close the stop valve (11) in the hot water pipe.
Close the stop valve (4) between the cold water head tank and the cold water inlet
(A).
Open the drain valve (9).
Bleed the water heater (or installation) so that it drains completely.
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