Ariston CLAS X - 5.7 AIR PRESSURE SWITCH; 5.8 FAN.; 5.8.1 Post-ventilation.

Training manual CLAS X
Pag. 48 di 69
5.7 AIR PRESSURE SWITCH
The boiler uses a differential pressure switch to check correct evacuation of the fume:
 24kW: Off= 50Pa/0,50mbar;
On= 60Pa/0,60mbar;
 28kW: Off= 74Pa/0,74mbar;
On= 89Pa/0,89mbar.
 32kW: Off= 74Pa/0,74mbar;
On= 89Pa/0,89mbar;
The first pressure value is taken on the fan (intake “L” on the air pressure switch).
The second pressure values is taken inside the combustion chamber (intake “H” on the air pressure switch).
Actually two negative pressure values are used ( in relation to the atmospheric pressure) but that counts
most of all for the air pressure switch, is that there is an appropriate pressure difference ( which can be
measured with a differential pressure gauge connected to the two pressure intakes located on the upper side
of the boiler).
Air pressure switch is not carried out during operation. Any “opening” during operation is not detected.
6 07 : Pressure switch enabled already before the ignition sequence.
6 P1 : Pressure switch enabling missed with fan turned on.
5.8 FAN.
The following fans are used:
- 24kW: 30W motor;
- 28kW: 60W motor;
- 32kW: 60W motor;
5.8.1 Post-ventilation.
5.8.1.1.1.1 Switch Off
Post-ventilation time
CH burning off
Winter to Summer commutation
CH Temp Reached burner off
Par 243=05sec
Par 243=13min
DHW burning off
DHW Antiscale off
Storage Loading burner off (Tank)
Storage Loading burner off (System) (par.228=2)
Storage Loading burner off (Antilegionella)
Par.254=0
Tflow>75°C3min
Tflow<75°C 5sec
Par.254=1
always 3 min
Comfort Pre-heating burner off
5 sec
Chimney function end burner off
Chimney function Temp reached burner off
1 min
Antifreeze Temp Reached burner off (Tflow > 40°C)
Antifreeze burner off (end 15 min timer)
5 sec
5.8.1.1.1.2 Fault
Post-ventilation time
No Flame error (5P1 - 5P2)
Flame lift error (5P3)
10 sec (ATM)
Water Flow Check Shutdown (1P1 – 1P2 – 1P3)
10 sec
No Flame Error (501)
Overtemp Error (101)
40 sec
Water Flow Check Shutdown Error (103 – 104 – 105 – 106 – 107)
40 sec
T Flow probe error (110)
T Ret probe error (112)
5 sec
Water Pressure error (108)
40 sec
False Flame (502)
Always on
APS Warning ( 6P1-6P2)
Always On