ACV International
6
1
Desired temperature reached
The burner manager can temporarily block the request for heat. The burner is then
stopped. Blocking occurs because the requested temperature has been reached.
When the temperature has fallen sufficiently the blocking is cancelled.
2
Self-test
The connected sensors are checked regularly by the burner manager. During the
check the manager does not perform any other tasks.
3
Ventilation
When the appliance is started the fan is first brought to starting speed. When the
starting speed has been reached the burner is lit. Code
3
is also visible when post-
ventilation is taking place after the burner has stopped.
4
Ignition
When the fan has reached the starting speed, the burner is ignited by means of
electrical sparks. During ignition the code
4
is visible. If the burner does not ignite,
a new ignition attempt occurs after approximately 15 seconds. If after 4 ignition
attempts the burner is not yet burning, the burner manager goes into fault mode.
(See section 8.2.1).
5
CH operation
An of/off thermostat, an OpenTherm thermostat, an external sensor or a combination
of the latter can be connected to the burner manager. (See section 10.2)
When a request for heat is received from a thermostat, the fan is started (code
3
),
followed by ignition (code
4
) and CH operating mode (code
5
).
During CH operation the fan speed and hence the appliance power are controlled by
the burner manager so that the CH water temperature reaches the desired CH
supply temperature.
If an on/off thermostat is connected, this is the CH supply temperature set on the
display. In the case of an OpenTherm thermostat the desired CH supply temperature
is determined by the thermostat. In the case of an external sensor the desired CH
suppply temperature is determined by the heating line programmed in the burner
manager. For the latter two, however, the maximum is the temperature set on the
display.
The CH operation the requested CH supply temperature is indicated on the operating
panel.
The CH supply temperature can be set between 30°C and 90°C. (See section 7.1).
The actual CH supply temperature can be read by pressing the service button during
CH operation.
When the DHW comfort function is switched on (See code
7
) any OpenTherm
request for heat of less than 40°C is ingored.
The resistance R may be removed if the room thermostat does not need anticipation
current. (See section 10.2)
6
DHW operation
The hot water supply takes priority over the heating. When the sensor in the DHW
tank measures a temperature 5 °C below the setting, an eventual CH demand will be
stopped, the devider valve will switch and the boiler will heat up the DHW tank until
the demanded temperature has been reached. During this process the display shows
code
6
When a thermostat is used instead of a sensor the DHW heat demand starts when
the thermostat opens en stops when the thermostat clothes.
During DHW operation the fan speed, and hence the power of the appliance, are
controlled by the burner manager so that the DHW water temperature reaches the
DHW temperature setting.
The water temperature can be set between 40°C and 65°C (See section 7.1) and is
displayed on the operating panel during DHW operation.
The actual DHW temperature can be read by pressing the service button during
DHW operation.
