Ariston CLAS - Overheat Thermostat

Training manual CLAS
Pag. 38 di 71
4.15 OVERHEAT THERMOSTAT
The opening of contact of overheat thermostat (102±4°C) causes boiler safety
shutdown (not signalled) and if after 5 sec the thermostat is already opened
causes shutdown signalled by the “blocked” led that lights up and the relevant
error code shown on the display 1 01.
To restart the boiler the temperature must be go down within the normal
operating values (of the thermostat (87°C) and of the limit temperature (88°C)
of the delivery probe on heating mode and 81°C on the delivery probe on
sanitary mode) and that the reset button on the control panel is pressed in
order to restart the boiler.
ON
OFF
ON
OFF
ON
OFF
Burner
Fan
Circulating
device
Flow meter or
sanitary
antilime Off
85°C
(heating
delivery)
102°C
(overheat
thermostat)
Temperature
40 sec post vent.
2 min post-circol.
Shutdown
“1 01”
5 sec post-vent.
30 sec post-circul.
(only at the end of withdrawal )
Circulating device non stop after off for
antilime
OPERATIONON SANITARY MODE
ON
OFF
ON
OFF
ON
OFF
Burner
Fan
Circulating
device
Tset + 4°C
(heating
delivery)
85°C
(heating
delivery)
102°C
(overheat
thermostat)
Temperature
.
40 sec post vent.
2 min post-circol.
Shutdown
“1 01”
5 sec post-vent.
> 2 min
OPERATION ON HEATING MODE