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Doc890/3456CV02B 45
6 Operating instructions
6.1 Function
When a heating demand is received and before the boiler starts up, the appliance must be pre-
purged.
Gas and air are optimally mixed in the mixing chamber. The fan supplies air for combustion, the
quantity being regulated by the frequency controlled fan speed. A proportional controller deter-
mines (also by means of regulation) the required quantity of gas. Thereafter, the gas air mixture
is ignited in min. load on the pilot burner wich is a part of the main burner. After measuring of the
ionisation current the main gas valve will be opened and the ionisation measurement switches to
the main burner. The fan also ensures that the resulting fl ue gasses are subsequently removed.
The removal system for these gasses performs an essential function for the proper operation of
the appliance.
The unit has no limits for return water temperature. If this tem perature is low, condensation will
be formed which will then be removed via the drainage system.
6.2 Regulation
Depending on the heating demand, the unit will be started up and shut down between 0% and
25% capacity and will be continuously modulated between 25% and 100% capacity.
6.3 Control module
Lid closed Lid open
Fig. 32 Control module
1 function 1 parameter indication
K standby P1 current/setting boiler supply temp.
F automatic operation P2 current/setting domestic hot water
t summer operation temperature
W1 manual operation min. P3 desired temperature
W2 manual operation max. P5 current external temperature
2 function selector P8 current low velocity header temp.
3 fault indication w P9 current boiler capacity
4 supply temperature P10 password entry for factory settings
5 malfunction code ( ashing) 2 optical I/O
3 reset/programming push-button
4 alarm LED
5 parameter/value selector
6 output status
7 current/desired parameter value
8 fault/parameter indication
9 input status
42


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