A.O. Smith 120 through 250 Series, Installation, User And Service Manual

Page: 52 / 104

Draining
50 Instruction manual BFC
6
gis
6.1 Draining unvented
installations Some service activities require the water heater to be drained. The procedure
is as follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
4. 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.
5. Switch the water heater OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by setting the isolator
between the water heater and the mains power supply to position 0.
7. Shut off the gas supply (10).
8. Close the stop valve (11) in the hot water pipe.
9. Close the supply valve (4) in the cold water inlet (A).
10. Open the drain valve (9).
6.2 Draining vented
installations Some service activities require the water heater to be drained. The procedure
is as follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
4. 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.
5. Switch the water heater OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by setting the isolator
between the water heater and the mains power supply to position 0.
7. Shut off the gas supply (10).
8. Close the stop valve (11) in the hot water pipe.
9. Close the stop valve (4) between the cold water head tank and the cold
water inlet (A).
10. Open the drain valve (9).
11. Bleed the water heater (or installation) so that it drains completely.
MENU
»OFF
^ ON
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