Pump kick and diverter valve kick
Every 24 hours, if there is no heat demand from heating or DHW
the pump will be started for 10 seconds and the diverter valve will
be opened and closed again. This is done to prevent the pump and
diverter valve from sticking.
Boiler anti-cycle time
If during a demand for central heating the burner switches off, because
the desired flow temperature is exceeded, there will be an anti-cycle
time in operation for 5 minutes. This means that the burner switches on
again after 5 minutes if there is still a demand for the heating.
Pump overrun
After the heating demand the burner will shut down and the pump will
run for a further 60 seconds. This can be changed in parameter 2.3.7
from 1 - 16 minutes. After DHW demand it would be 30 seconds if T1 is
<75°C or 3 minutes if T1 >75°C.
Air Purge Program
(Combi and System boilers)
The boiler is equipped with an automatic air purge program.
The installation system needs to be filled with water and bled free of
air before turning power onto the boiler. Then the automatic air purge
program will ensure that the boiler is free of air before firing up.
The automatic air purge program starts when the water pressure in the
boiler gets to 1.1 bar. The display will show
‘Air purge Active’
on the
screen with the current central heating system water pressure.
The complete program for the boiler air purge takes 7 minutes.
During these 7 minutes, the pump is started and stopped, and the
three-way diverter valve is alternately sent to the heating and to the
DHW position several times and with short pauses to make sure that
the air inside the boiler leaves through the automatic air vent.
System boiler
Same as combi, but there is no internal diverter valve to move.
Regular boiler
Same as combi, but there is no diverter valve to move or a pressure
reading and there is a feed & expansion tank.
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