A.O. Smith BFC-120, Инструкция по установке, эксплуатации и обслуживанию

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Open the drain valve (9).
7.10.2.2 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.
7.10.2.3 Draining the solar heating system
Note
No special safety measures are required when working with the diluted glycol solution
specified by the manufacturer. For more information about the fluid, please contact the
manufacturer.
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.
Warning
The fluid in the pipes and the pipes themselves can be extremely hot! You should
therefore wait until the water heater has cooled down sufficiently.
Switch off the solar heating system.
Connect a hose to the lowest drain point in the solar heating system.
Insert the hose into the glycol jerry can.
Open the valve of the lowest drain point.
Open the air bleed point (26) of the solar heating system.
Close the drain point when the jerry can is full.
Insert the hose in a new jerry can.
Repeat steps 6 and 7 until no further glycol comes out of the system.
Close the air bleed point and the valve of the drain point.
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0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03 79