Starting the water heater
58 Instruction manual BFC
9
gis
When the water heater starts, it will run through the
following steps:
1. The water temperature drops below the set
temperature of (for example)
65
°C. The controller
detects a heat demand and starts the operating
cycle.
- The icon is activated.
- The message
HEAT DEMAND
appears.
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 are dimmed
- 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 , and are dimmed.
- The icon is activated.
- The message
POST PURGE
appears.
8. Following the post-purge, the fan stops and the
pressure switch opens:
- The icons and are dimmed.
- The message
POST PURGE
vanishes.
With any subsequent heat demand, the heating cycle
will resume from step 1.
ON Ê
13:45 Thursday 63ÉC
Tset 65ÉC
HEAT DEMAND
ON Ê Ê
13:45 Thursday 63ÉC
Tset 65ÉC
PRE PURGE
ON Ê Ê Ê
13:45 Thursday 63ÉC
Tset 65ÉC
PRESSURE SWITCH
ON Ê Ê
13:45 Thursday 63ÉC
Tset 65ÉC
GLOW PLUG
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