Immergas HERCULES Condensing 26 2 E Manual page 49

Technical Documentation
Three-way valve/anti-block
pump
Fan speed anomaly
Periodical self-check
Electro-mechanical con-
tacts block
Parasite flame block
No ignition
Ignition
Safety thermostat block
STHCkW ed 04/09
Safety devices.
After 24 hours from the last activation, independently from the functioning status of the
boiler (Summer or Winter), the pump (M1) is started for a time of 30 seconds and the
three-way valve (M30) is started for a period of 10 seconds.
If a fan speed is detected that is out of safe limits (700-5700 rpm) the burner is switched
off and it cannot be re-ignited for 7.5 minutes.
To re-start the appliance, press the "Reset" button "C" and then make a central heating
or domestic hot water request.
The P.C.B. carries out a periodical self-check to control its correct functioning. During
functioning in heating mode or with boiler in stand-by, the function activates every 18
hours after the last boiler check/power supply.
In case of functioning in domestic hot water mode the self-check starts within 10 minutes
after the end of the withdrawing in progress, for duration of approx. 10 seconds.
N.B.: the boiler remains inactive during the self-check, the display continues to show the
functioning state previous to the self-check, to then re-start normal functioning.
In the case of: high resistance of the safety thermostat contact (contact not perfectly closed
or worn); anomaly on gas valve piloting circuit; no electric connection to the gas valve
(connector disconnected or gas valve coils shut-off); error inside the integrated P.C.B, the lat-
ter performs a reset and starts a new cycle to check contacts; if the problem persists after
6 check cycles, boiler functioning is prevented.
To re-start the appliance, press the "Reset" button "C" and then make a central heating
or domestic hot water request.
In the case of dispersion of the detection circuit or anomaly in the flame control that
generates a correct ionisation current (without the gas valve being open) with the duration
of at least 20 seconds, boiler functioning is blocked.
To re-start the appliance, press the "Reset" button "C" and then make a central heating
or domestic hot water request.
If within 10 seconds from the start of the ignition cycle, the detection electrode (E2) has
not detected flame presence on the burner, boiler functioning is blocked.
The integrated P.C.B. makes 2 ignition attempts with duration of 10 seconds, intervalled
by a time of 30 seconds, after which it blocks.
To re-start the appliance, press the "Reset" button "C" and then make a central heating
or domestic hot water request.
N.B.: It is possible to reset the anomaly up to 5 consecutive times, after which the func-
tion is prevented for at least one hour and one attempt is gained after every hour. Five
attempts can be gained by pressing the
supply to the circuit.
If the contact of the water overheating thermostat is opened (temperature of the primary
circuit exceeding 100 °C), boiler functioning is blocked.
To re-start the appliance, press the "Reset" button "C" and then make a central heating
or domestic hot water request.
47
Technical Documentation
or Stand-by key or by removing the power
HERCULES Condensing Export