ENG - Manual of installation, use and maintenance.
210-0352_libretto_WHC_ATI_eng.docx
29
Jan-19
25.
OTHER SYSTEM FEATURES
POST-CIRCULATION
The boiler pump post-circulation function is useful to
dissipate the water exceeding heat in the circuit after an
operating phase with burner. It is performed when the
following conditions are met:
1.
Change from boiler heating mode to standby or off
mode.
2.
Change from chimney sweep mode (at minimum
or maximum power) to the stand-by or off mode.
This happens only if the pump is active and the
burner ignited during the mode transition;
otherwise, at the mode transition the circulation
pump stops (or remains stationary).
LOCKOUT PREVENTION
This feature is useful to prevent the lockout of the
circulation pump after a prolonged period of inactivity. In
particular, if 24 hours have passed without any pump
activation and the board is in the stand-by status,
the
circulator will switch on for 5 seconds at the maximum
speed.
POST-VENTILATION
Following the turning off of the burner (for any reason,
such as change of operating status, anomaly,
overtemperature), it is possible to perform a post-
ventilation cycle to ventilate the heat exchanger and
discharge residual flues or unburned gas. The duration of
the post-ventilation cycle and the fan speed can be set from
parameter.
26.
FAULTS
Any anomaly in the system operation is detected and
displayed on the LCD control board. In particular, the
message "Err." will appear at the bottom right corner
alternately with the specific error code (or, if the system is
affected by more than one anomaly at the same time, with
the error code of the last detected anomaly). The notation
for the error code is as follows: "Fxxx", where "xxx"
indicates the anomaly code. For each anomaly the fault
code is reported, as well as the description (with
suggestions on what to do to solve the problem) and the
system performance, particularly with regard to loads
management.
In addition to reporting the error code, the LCD shows the
fault symbol and the symbol related to device in
failure. Whenever a fault occurs, the back-lighting of the
display is activated for ten seconds, then it turns off.
27.
SAFETY ANOMALIES
These anomalies relate to the operating cycle (safety) of
the system, namely the ignition cycle and the presence /
absence of flame in the burner when working up to speed.
FAULT F020
DESCRIPTION
Lockout due to ignition failure.
ACTIVATION / DEACTIVATION CONDITIONS
The anomaly occurs if there is a request for
ignition and the system performs all attempts
available, without being able to ignite the burner.
The anomaly is deactivated, if you press and
release the
reset button.
DISPLAYS
The message "Err." appears alternately with the message
"F020". The
flashing fault symbol and the
flashing
lockout failure symbol are displayed.
DEVICES
Gas valve: Off.
Fan: a post-ventilation cycle is performed, if foreseen, then
it is deactivated.
Circulation pump: Off.
FAULT F022
DESCRIPTION
Parasitic flame.
ACTIVATION / DEACTIVATION CONDITIONS
The anomaly occurs, if there is an ignition request
and the system detects the presence of flame in
the burner for two consecutive seconds before the
safety time.
The anomaly is deactivated, if the system detects
no flame before the safety time.
