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14
Boiler service functions
7.3 Air purge mode
The first time the appliance is switched on, a once-only
venting function is activated. The heating pump then
switches on and off at intervals. This sequence lasts
about 8 minutes.
The text display shows 7.3 Air purge mode and the
2-digit display shows
0
0
in alternation with the CH flow
temperature.
The automatic (27) vent must be opened and then
closed again once the venting sequence is complete.
• If the venting function is set to “On, autom. deacti-
vat.”, the function is set to “Off” once the sequence
has been completed.
7.4 Actual map pump step
Actual value of this parameter.
7.5 Map pump load index
Actual value of this parameter.
7.6 Map pump type
Encoded type of installed map pump.
7.7 Output reduction
The appliance is supplied with this function activated. It
prevents overload of the heat exchanger with high CH
flow temperatures.
The output of the burner is reduced according to the
CH flow temperature, i.e. up to 80˚C flow temperature,
full burner output is permitted. Above 80˚C, the burner
output is reduced as flow temperature increases up to
90˚C at which only minimum output is available (even
with maximum heat demand).
This function can be deactivated for hot water and/or
central heating mode.
8.5 Siphon fill program
The trap filling programme ensures that the condensa-
tion trap is filled when the appliance is first installed or
after it has been shut down for a long period: The con-
densation trap prevents flue gas escaping from the
appliance into the room in which it is installed.
The trap filling programme is activated:
• the appliance is switched on at the master switch
• the burner has not been in operation for at least 48
hours
• the appliance is switched from summer to winter
mode.
The next time the heating or hot water system calls for
heat, the appliance is held at minimum output for 15
minutes. The trap filling programme remains active until
the appliance has completed 15 minutes of operation at
minimum output.
The text display shows Siphonfillprogram on,
adjust. min.output and the 2-digit display alternates
between -II- and the CH flow temperature.
9.1 Min fan overrun
Minimal fan overrun time after a boiler demand.
9.2 Hot water on demand
The appliance is supplied with this function activated.
This function relates to ECO mode (the
button
lights).
The demand detection function enables maximum gas
and water economy.
Briefly turning a hot water tap on and then off again sig-
nals demand to the appliance which then heats up the
water to the set temperature.
Hot water is then available at short notice.
9.3 GFA-Asic-error
(not applicable)
i
The venting function can be activated
manually after servicing.
If the condensation trap is not filled, flue
gas can escape!
B
Only deactivate the trap filling pro-
gramme in order to carry out servicing
work.
B
Always re-activate trap filling pro-
gramme once servicing is complete.
