A.O. Smith BFC Cyclone 28 Installation, User And Service Manual page 26

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2. Once demand is registered, the fan is started to vent any gases that may be present.
This phase is called pre-purge and lasts about 15 seconds.
-
The icon is activated.
- The message PRE PURGE appears.
3. During the pre-purge, the pressure switch closes.
-
The icon is activated.
- The message PRESSURE SWITCH appears.
4. This is then followed by the (pre-)glow of the hot surface igniter.
-
The icons and
-
The icon is activated.
5. After a number of seconds pre-glow, the gas control valve is opened and ignition
takes place.
-
The icon is activated.
- The message IGNITION appears.
6. After ignition, the flame is detected and the appliance will be running. This means
that actual heating has started:
-
The icon is dimmed.
-
The icon is activated.
- The message RUNNING appears.
7. When the water is up to temperature, the heat demand ceases and the post-purge
starts. This takes about 25 seconds.
-
The icons ,
-
The icon is activated.
- The message POST PURGE appears.
are dimmed
and are dimmed.
User part