2.3 Operating conditions
A code on the service display of the operating panel indicates the
appliance’s operating mode.
-
Off
The appliance is out of operation but is supplied with electrical power. No
response occurs to calls for DHW or CH. The appliance frost protection is
active. This means that the pump operates and the exchanger is heated
up if the temperature of the water present in it falls too far.
If the frost protection is actuated, code
7
is displayed (heating
exchanger).
In this operating mode the pressure in the CH installation (in Bar) can
also be read on the temperature display.
Waiting mode
The LED at the button is lit and possibly one of the LEDs for the DHW
comfort function. The appliance is ready to respond to a request for CH
of DHW.
0
Running on of CH
After the end of CH operation the pump continues to run. The running on
time is factory set at he value in accordance with section 8.3 , page:35.
This setting can be changed.
In addition, the pump runs automatically for 10 seconds once every 24
hours in order to prevent seizing. This automatic switching on of the
pump occurs at het time of the last call for heat.
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 9).
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 11.2)
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.
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