Waiting position
The LED of the
on/off
key and if necessary one of the LED’s of the
domestic hot water comfort function are on. The appliance is ready for
responding to the demand for CH or domestic hot water.
0
Pump overrun
After the operation of the CH, the pump has an overrun. This overrun time
is set to the value according to table 4 at the factory. This setting can be
changed. Also, the controller will automatically run the pump for 10
seconds, once every 24 hours, to prevent it from getting stuck. This
activation of the pump takes place at the time of the last heat demand. In
order to change this time, set the room thermostat higher for a while at the
desired time.
1
Required temperature reached
The burner controller can temporarily block the heat demand and stop the
burner. This blocking takes place because the required temperature has
been reached. When the temperature has dropped sufficiently, the
blocking is cancelled.
2
Self-test
The burner controller regularly checks the connected sensors. During the
check, the controller does not carry out any other tasks.
3
Ventilate
At starting the appliance the fan is first brought to the starting speed.
When reaching the starting speed, the burner is ignited. Code
3
is also
visible when after stopping the burner post-purge takes place.
4
Ignite
When the fan has reached the ignition speed, the burner is ignited by
means of electric spark ignition. During ignition the code
4
appears. If
the burner is not ignited, another ignition attempt is made after about
5 seconds. If the burner has still not fired after the fourth ignition attempt,
the controller indicates a fault. See § 8.1.
5
CH operation
An on/off thermostat can be connected to the controller, if necessary in
combination with an outside sensor. See Electrical diagram. When heat is
demanded by a thermostat signal, the fan runs (code
3
) and the burner is
ignited (code
4
), followed by the CH operating condition (code
5
).
During CH operation, the fan speed and hence the power of the appliance
is adjusted. This is done in such a way, that the temperature of the CH
water is controlled towards the set CH supply temperature. In the case of
an on/off thermostat, the CH supply temperature is set at the operating
panel. In the case of an outside sensor, the CH supply temperature is
determined by the weather dependent control programmed in the burner
controller.
9