Ariston CLAS X - 3.3 ANTIFREEZE FUNCTION

Training manual CLAS X
Pag. 20 di 69
3.3 “ANTIFREEZE” Function
This function is enabled only if the ON/OFF selector is turned on position ON. It is operated by means of the
temperature detected by the heating delivery probe (NTC1).
CONDITION
EVENTS
TIME
1
ST
CASE
The temperature
detected by probe
NTC1:
Ranges between
3°C and 8°C
- The PUMP is supplied on speed III
- The 3-WAY VALVE alternatively
switches the position of the shaft from 1
minute on “heating” to 1 minute on
“sanitary” mode
- The DISPLAY shows the icon
Until the
NTC1
temperature is
 9°C
If, after 20 minutes,
the CONDITIONS described in the 1
st
CASE are still present (3°C<NTC1<8°C)
automatically check the EVENTS of the 2
nd
CASE
CONDITION
EVENTS
T TIME
2
nd
CASE
The temperature
detected by probe
NTC1:
Is below 3°C
- The BURNER turns on, supplied with
minimum power;
- The 3-WAY VALE is positioned on
“sanitary” and switch every 30 s
DHW/CH
- When the temperature is  40°C the
burner turn OFF. For 15 minutes the
boiler maintain the temperature between
35°C and 40°C
- After 15 minutes there is 2 minutes of
post circulation in heating
- Into 90 minutes if the temperature
decreases again less than 8°C the
burner switch on immediately.
- The DISPLAY shows the icon .
Until the
NTC1
temperature is
 40°C
If the NTC1 delivery probe is not working (open or short circuit) the “antifreeze” function check is followed by
the NTC2 heating return probe but in these cases only the pump works (the burner doesn’t light). The display
doesn’t show the antifreeze enabling code, but the error code of the NTC1 open or short circuit 1 10.
The antifreeze is enabled even if the NTC2 return probe is not working (open or short circuit) but only the
pump works (the burner doesn’t light). In this case the display doesn’t show the antifreeze enabling code, but
the error code of the NTC2 open or short circuit 1 12 .
The antifreeze is enabled even if the boiler is shutdown due to no flame detection 5 01 or blocked for over
heat 1 01, but in these cases only the pump works (the burner doesn’t light), and the display shows the error
code of blocking and not the antifreeze enabling one.
If there is an interruption of the power supply, the boiler maintains in memory all the setting and when the
power supply is on the boiler returns in the condition that had before the turning off.