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Draining
44 Instruction manual ADM
6
gis
6.1 Draining unvented
installations
Some service activities require the appliance to be drained. The procedure is as
follows:
1. Shut down the appliance by setting the ON/OFF switch on the control panel
to position 0.
2. Isolate the water heater from the power supply by putting the isolator
between the appliance and the mains power supply to position 0.
3. Shut off the gas supply (10).
4. Close the stop valve (11) in the hot water pipe.
5. Close the supply valve of the cold water supply (A).
6. Open the drain valve (9).
7. Bleed the appliance (or installation) so that it drains completely.