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2:2 BOILER
Start
When the boiler receives a start signal, the system
initiates a self-check period where the fan starts up at a
speed of around 2700 rpm, increasing to 3300 rpm after
15 seconds. If the speed on the first check is <500 rpm,
the start attempt is aborted and a new start attempt is
performed. During the period the new start attempt is
being performed, for some of the time the message "Fan
restarts" is shown on the display. If the boiler does not
start after five start attempts, "Fan failure" will be shown
on the display and no more attempts are performed.
Each start attempt takes around five minutes and, be-
ginning with the second attempt, a higher fan speed is
used to get the fan running. To reset after "Fan failure"
has been displayed, the main current to the boiler needs
to be disconnected and reconnected. If an AC system
is installed and connected to the boiler/panel, the 230 V
supply must also be disconnected to remove the error
message.
If the speed is within tolerance at the end of the period,
a spark is generated, the solenoid valve opens the first
stage for gas and the fan's speed drops to 2200 rpm.
Once the burner ignites, the electronics receive a sig-
nal via the sensor, the sparking ceases and the burner
burns at stage 1 for at least one minute before switching
to the second power output stage if the heating need so
requires. If the burner does not ignite within 10 seconds
after the gas valve is opened, the start attempt is aborted
and a new cycle is commenced. If this too proves
unsuccessful, no more start attempts are performed and
the message "Gas failure" is displayed on the control
panel. To reset the boiler, the gas symbol on the control
panel must be turned off and then turned back on.
Operation
Once the burner is in operation, the flame is monitored
via the sensor plug. If the flame goes out, the signal from
the sensor is interrupted and the gas supply is shut off
within one second. The boiler will then perform a start
attempt as described above.
The speed of the combustion fan is also monitored
continually when in operation. At stage 1, the speed is
2200±50 rpm, and at stage 2, 3500±50 rpm. If the speed
drops below 3150 rpm, the boiler switches down to stage
1. If the speed has also dropped below the permitted
speed, the boiler is shut down completely and a new
start attempt is performed. During the period the new
start attempt is being performed, for some of the time the
message "Fan restarts" is shown on the display. If the
boiler does not start after five start attempts, "Fan failure"
will be shown on the display and no more attempts are
performed. Each start attempt takes around five minutes
and, beginning with the second attempt, a higher fan
speed is used to get the fan running. To reset after "Fan
failure" has been displayed, the main current to the boiler
needs to be disconnected and reconnected. If an AC
system is installed and connected to the boiler/panel, the
230 V supply must also be disconnected to remove the
error message.
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Switching between power output stages
The boiler always ignites at stage 1. When switching
from stage 1 to 2, the fan speed increases from 2200
to 3500 rpm for around two to four seconds. When the
speed exceeds 2600 rpm, the gas valve for stage 2
opens, while stage 1 is kept open for the whole time. To
open the gas valve's stages, the electronics emit 12 volts
to the relevant coil's pull circuit for one to two seconds.
After this time, the valve is kept open using the hold cir-
cuit. The pull circuit has a current consumption of around
1.5 A, whereas the hold circuit's current consumption is
only around 0.05 A.
Control
The temperature in the vehicle is controlled in terms of
the difference between the actual temperature in the
vehicle and the desired temperature set on the control
panel (Δt). If el 3 kW + gas has been selected, the boiler
controls the temperature as follows:
Δt Function
+0.7°C Pump 33% El 1 kW
+0.4°C Pump 66% El 2 kW
+0.0°C Pump 100% El 3 kW
-0.5°C Pump 100% El 3 kW Gas stage 1 33%
-1.0°C Pump 100% El 3 kW Gas stage 1 66%
-1.5°C Pump 100% El 3 kW Gas stage 1 100%
-2.0°C Pump 100% El 3 kW Gas stage 1 100% stage 2 33%
-2.5°C Pump 100% El 3 kWGas stage 1 100% stage 2 100%
If e.g. only gas has been selected on the control panel,
the stages for electricity do not apply and gas stage 1,
33% goes to the top of the control list. Maximum convec-
tor temperature when the circulation pump is in operation
is 85–90°C. When the circulation pump shuts down the
maximum temperature is 80°C.
Domestic hot water
The boiler always retains a basic level of domestic hot
water at approximately 50°C. If the temperature drops
below this level, the boiler increases its power output by
one level according to the control stages. This can result
in the temperature rising slightly in the caravan, and this
in turn results in the pump shutting down and the boiler
switching to only generating domestic hot water for a cer-
tain time. If there is no heating need, but the boiler is only
working to generate domestic hot water, the boiler works
at the electrical power output which has been selected.
If only gas has been selected the boiler works at
gas stage 1. Domestic hot water control can also be
deselected, e.g. at night when no domestic hot water is
needed.
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