Starting and running
56 Instruction manual GWV
9
gis
Once the appliance starts, it will run through the
following steps:
1. The water temperature drops below the set
temperature of (for example)
65
°C. The electronic
controller detects a demand and starts the heating
cycle.
- The icon is activated.
- The message
HEAT DEMAND
appears.
2. Following heat demand, the fan is powered up and
the pre-purge begins. This lasts about 15 seconds.
During this phase, any residual gases are
removed.
- 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. After a little time, the pre-purge ceases and the
electronic controller reduces the speed of the fan
to the rotational speed for ignition. This is followed
by the (pre-)glow of the hot surface igniter.
- The and icons are removed.
- The icon is activated.
5. After a number of seconds pre-glow, the partial
load gas control is opened and ignition takes
place.
- The icon is activated.
- The
IGNITION
message appears.
6. After ignition, the flame is detected and the
appliance will be running. This means that actual
heating has started. The rotational speed of the fan
then increases to the normal running speed for the
partial load phase, and the pressure switch closes:
- The icon is removed.
- The and icons are activated.
- The
RUNNING 1
message appears.
7. If the temperature difference between T
set
and T
3
is greater than the downward hysteresis plus the
stage difference, then second gas control (full loaf
gas control) is opened and the other burners ignite.
8. After ignition of the full load phase, the flame on
these burners is not detected separately; the
appliance is however operational. The rotational
speed of the fan then increases to the normal
running speed for the fully loaded phase:
- The
RUNNING 2
message appears.
9. When the water is almost up to temperature (T
set
minus stage difference), the gas control for the full
load phase closes and the fan's rate drops to the
revs for the partially loaded phase.
- The , , and icons remain activated.
- The
RUNNING 1
message appears.
ON Ê
13:45 Thursday 63ÉC
Tset 65ÉC
HEAT DEMAND
ON Ê Ê
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Tset 65ÉC
PRE PURGE
ON Ê Ê Ê
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Tset 65ÉC
PRESSURE SWITCH
ON Ê Ê
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Tset 65ÉC
GLOW PLUG
a
a
a
a
ON Ê Ê Ê
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Tset 65ÉC
IGNITION
ON ÊÊÊ Ê
13:45 Thursday 63ÉC
Tset 65ÉC
RUNNING 1
ON ÊÊÊ Ê
13:45 Thursday 63ÉC
Tset 65ÉC
RUNNING 2
a
a
a
