Instruction manual GWV 49
gis
5. Switch the appliance OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by putting the isolator
between the appliance 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 supply (A).
10. Open the drain valve (9).
11. Bleed the appliance (or installation) so that it drains completely.
6.3 Draining vented
installations
Some service activities require the appliance 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 symbol is then dimmed.
Caution
Failure to wait until the fan stops purging can cause damage to the
appliance.
5. Switch the appliance OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by putting the isolator
between the appliance 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.
GEN ES I S
IMD-
11 R1
GEN ES I S
IMD-
11 R1
