k c a - 영 문
75
Primary water pressure is continuously checked; curing stand-by and during running condition. If
the water pressure is or goes under 0,5 bar, the boiler is stopped and the fault code E10 appears
on the display.
If the water flow pressure goes over 3,5 bar (for example because of a hydraulic safety valve
blocking), the boiler is stopped and the fault code E13 appears on the display.
Every time the pump starts, water flow is checked monitoring the pressure increment obtained in
the output of the pump. This increment must be at least 0,5 bar.
If, within 10 sec, this increment of pressure is not recognized, the burner doesn’t switch-on and
the pump is stopped for 10 sec.
After that time the pump runs again for a new attempts. After 5 attempt without success, the boiler
is stopped and the fault code E02 appears on the display
In case of absence of circulation (for example for the closure of all the radiators thermostatic
valves) the pump remains in ON condition, the burner ignition is avoided and the error code E02
is shown.
As soon as the circulation returns, the error disappears and the burner ignition is enabled. On the
other side if, for example, the primary flow switch is broken because of electrical short circuit, the
burner ignition is still avoided and the error code E13 is shown.
If the primary temperature probe failure occurs (interruption and short circuit) the burner switch off
and the fault code is displayed (E05, E06).
If a DHW temperature probe failure occurs (interruption and short circuit) the DHW service is
avoided and the fault code is displayed (E07, E08).
The DHW temperature probe is not checked if the external water storage is set.
During a running condition (burner on), if the temperature in the heat exchanger overcome 95
℃
,
or, if the temperature in the exhaust duct overcome 95
℃
, the boiler falls in a lock out condition
and stay in that condition up to the reset of the boiler.
In the meantime the pump and the fan continue to run up to this temperature comes down under
65
℃
. In order to reset the boiler is necessary to remove the cause of the overheating and to
wait up to the temperature goes down under 65
℃
.
During a stand-by condition (burner off), if the same problem occur, the error code E20 appears
on the display up to this temperature comes down under 65
℃
; in the meantime the pump and
the fan continue to run. If during this time a request of injection occurs the boiler falls in a lock out
condition and stay in that condition up to the reset of the boiler.
Primary Flow and Primary Pressure Checking
Temperature Probe Failure
Lockout for high limit switch or for chimney thermostat intervention
