Ariston CLAS X Installation guide

TRAINING
MANUAL
FAMILY: Wall Hang boiler
UNIT: Conventional Compact
MODELS: CLAS X FF/CF
RELEASE: 1V0 06.06.2016
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Training manual CLAS X
Pag. 2 di 69
U
UP PD DA AT TE E
1V0
06/06/2016
MTL
Document creation
VERSION
DATA
NAME
MODIFICATION

Training manual CLAS X
Pag. 3 di 69
INDEX
1GENERAL INFORMATION..................................................................................................................................5
1.1 SIZES AND DIMENSIONS .............................................................................................................................5
1.2 SEALED CHAMBER OVERALL VIEW (FF).................................................................................................6
1.3 SEALED CHAMBER OVERALL VIEW (FF -SYSTEM)..............................................................................7
1.4 OPEN CHAMBER ASSEMBLY VIEW (CF) ..................................................................................................8
1.5 HYDRAULIC SCHEMES................................................................................................................................9
1.6 CONTROL PANEL ........................................................................................................................................10
1.7 DISPLAY........................................................................................................................................................11
2OPERATION..........................................................................................................................................................12
2.1 HEATING MODE: OPERATING LOGIC.....................................................................................................12
2.2 SANITARY MODE: OPERATING LOGIC...................................................................................................15
3SPECIAL FUNCTIONS.........................................................................................................................................18
3.1 FLUE CLEANER” FUNCTION.........................................................................................................................18
3.2 “COMFORT” FUNCTION.................................................................................................................................19
3.3 “ANTIFREEZE” FUNCTION............................................................................................................................20
3.4 “WATER FLOW CHECK ”...........................................................................................................................21
3.5 “AIR PURGE” FUNCTION ...............................................................................................................................22
3.6 “SELF ADAPTIVE HEATING RESTART DELAY” ....................................................................................22
4HYDRAULIC BLOCK ..........................................................................................................................................23
4.1 COMBI HYDRAULIC BLOCK...............................................................................................................................23
4.2 SYSTEM HYDRAULIC BLOCK.............................................................................................................................24
4.3 3-WAY VALVE..............................................................................................................................................25
4.3.1 Stepper motor..............................................................................................................................................27
4.4 SECONDARY EXCHANGER.......................................................................................................................29
4.4.1 Antiscale limit temperature.........................................................................................................................29
4.5 PUMP UNIT ...................................................................................................................................................30
4.5.1 PUMP speed check.....................................................................................................................................31
4.5.2 Post-circulation. .........................................................................................................................................32
4.6 HEATING PRESSURE SWITCH ..................................................................................................................33
4.7 FILLING TAP.................................................................................................................................................33
4.8 DRAIN VALVE..............................................................................................................................................33
4.9 BY-PASS ........................................................................................................................................................34
4.10 PRIMARY HEAT EXCHANGER..................................................................................................................35
4.11 HEATING FILTER.........................................................................................................................................36
4.12 EXPANSION VESSEL...................................................................................................................................37
4.13 SANITARY FLOW SWITCH ........................................................................................................................38
4.14 TEMPERATURE PROBE..............................................................................................................................39
5GAS UNIT...............................................................................................................................................................40
5.1 SIT 845 SIGMA GAS VALVE. ......................................................................................................................40
5.2 SOLENOID VALVE ELECTROPNIC CONNECTION DIAGRAM. ...........................................................40
5.3 GAS REGULATIONS....................................................................................................................................41
5.3.1 SUPPLY PRESSURE CHECK....................................................................................................................41
5.3.2 MAXIMUM SANITARY POWER CHECK..................................................................................................41
5.3.3 MINIMUM POWER CHECK......................................................................................................................42
5.3.4 SOFT IGNITION POWER CHECKING.....................................................................................................42
5.3.5 GAS PRESSURE/HEAT INPUT –MODELS CF.......................................................................................43
5.3.6 GAS PRESSURE/HEAT INPUT –MODELS FF.......................................................................................43
5.3.7 HEATING DELAY REGULATION.............................................................................................................44
5.3.8 HEATING MAXIMUM POWER REGULATION........................................................................................44
5.3.9 GAS TABLE ................................................................................................................................................44
5.4 BURNER ........................................................................................................................................................46
5.5 IGNITION CYCLE.........................................................................................................................................47
5.6 THE FUME DISCHARGE SYSTEM.............................................................................................................47
5.7 AIR PRESSURE SWITCH .............................................................................................................................48
5.8 FAN.................................................................................................................................................................48

Training manual CLAS X
Pag. 4 di 69
5.8.1 Post-ventilation...........................................................................................................................................48
5.9 EXHAUSTIC CONTROL (CF OPEN CHAMBER).............................................................................................49
5.10 EXHAUST SYSTEMS (SEALED CHAMBER FF)..............................................................................................50
5.11 EXHAUST SYSTEMS (CF OPEN CHAMBER)..................................................................................................53
6ELECTRIC AND ELECTRONIC SYSTEM.......................................................................................................54
6.1 MAIN CARD ..................................................................................................................................................54
6.1.1 ELECTRIC DIAGRAM FF. ........................................................................................................................55
6.1.2 ELECTRIC DIAGRAM CF. ........................................................................................................................56
6.2 PERIPHERALS CONNECTION....................................................................................................................57
7MENU AND SETTINGS........................................................................................................................................58
7.1 TECHNICIAN MENU....................................................................................................................................58
7.2 COMPLETE MENU.......................................................................................................................................58
7.2.1 Menù 0 : Network .......................................................................................................................................58
7.2.2 Menù 2 : Boiler parameter .........................................................................................................................58
7.2.3 Menù 4 : Zone 1 parameters.......................................................................................................................60
7.2.4 Menù 5 : Zone 2 parameters.......................................................................................................................61
7.2.5 Menù 6 : Zone 3 parameters.......................................................................................................................62
7.2.6 Menù 7 : Zone module ................................................................................................................................63
7.2.7 Menù 8 : Service parameters ......................................................................................................................64
8ERROR CODES.....................................................................................................................................................65
8.1 BOILER PROTECTION SYSTEMS..............................................................................................................65
8.1.1 Error code...................................................................................................................................................65
9TECHNICAL DATA TABLE ...............................................................................................................................67

Training manual CLAS X
Pag. 5 di 69
1 GENERAL INFORMATION
1.1 SIZES AND DIMENSIONS
CAPTION
A
System delivery
B
Hot water outlet
R
Tank return (Clas X System)
C
Gas inlet
D
Cold water inlet
E
Heating system return

Training manual CLAS X
Pag. 6 di 69
1.2 SEALED CHAMBER OVERALL VIEW (FF)
CAPTION
1
Flue connector
14
Filling Tap
2
Air pressure switch
15
CH Filter
3
Air pressure switch pressure intake
condensate exhaust
16
Sanitary flow switch
4
Main Heat Exchanger
17
Pump
6
NTC1 heating delivery temperature
probe
18
Heating minimum pressure switch
7
Burner
19
NTC2 heating return temperature
probe
8
Ignition electrodes
20
3 Way Valve
9
Secondary Heat Exchanger
21
Detection electrode
10
Gas valve
22
Combustion Chamber
11
3 bar safety valve
23
Expansion Vessel
12
Spark generator
24
Fan
13
Pressure gauge

Training manual CLAS X
Pag. 7 di 69
1.3 SEALED CHAMBER OVERALL VIEW (FF - SYSTEM)
CAPTION
1
Flue connector
14
Filling Tap
2
Air pressure switch
15
CH Filter
3
Air pressure switch pressure intake
condensate exhaust
16
Sanitary flow switch
4
Main Heat Exchanger
17
Pump
6
NTC1 heating delivery temperature
probe
18
Heating minimum pressure switch
7
Burner
19
NTC2 heating return temperature
probe
8
Ignition electrodes
20
3 Way Valve
9
Secondary Heat Exchanger
21
Detection electrode
10
Gas valve
22
Combustion Chamber
11
3 bar safety valve
23
Expansion Vessel
12
Spark generator
24
Fan
13
Pressure gauge

Training manual CLAS X
Pag. 8 di 69
1.4 OPEN CHAMBER ASSEMBLY VIEW (CF)
LEGENDA
1
Flue Manifold
13
Pressure gauge
2
Flue Control Thermostat
14
Filling Tap
3
Flue Hood
15
CH Filter
4
Main Heat exchanger
16
Sanitary flow switch
6
NTC1heating delivery temperature
probe
17
Pump
7
Burner
18
Minimum pressure switch
8
Ignition electrodes
19
NTC2 heating return temperature
probe
9
Secondary Heat Exchanger
20
3 Way Valve
10
Spark generator
21
Detection electrode
11
3 bar safety valve
22
Combustion Chamber
12
Gas valve
23
Expansion Vessel

Training manual CLAS X
Pag. 9 di 69
1.5 HYDRAULIC SCHEMES
COMBI SYSTEM

Training manual CLAS X
Pag. 10 di 69
1.6 CONTROL PANEL
LEGENDA
1
Display
5
On/Off button
2
DHW Temperature control button
6
Auto
3
Summer/ Winter button
7
Reset button
4
Comfort button
8
CH temperature adjustment buttons zone 1 or
offset of thermoregulation slope with Auto-
function enabled.

Training manual CLAS X
Pag. 11 di 69
1.7 DISPLAY
ICONA
DESCRIZIONE
Set temperature
Error code
Reset indication
Menu seeing
Temperature indication
NavigationMenu number
NavigationParameter
number
Code request
Safety shutdown, nor
resettable
Error signal
Flame on and power level
Heating enabled
Heating request in progress
Sanitary enabled
Sanitary request in
progress
Comfort function enabled
Boiler off with antifreeze
function enabled
Antifreeze function in
progress
Auto function enabled
Solar system connected
Outdoor sensor connected
(optional)
Wi-Fi active (optional)

Training manual CLAS X
Pag. 12 di 69
2 OPERATION
2.1 HEATING MODE: OPERATING LOGIC
OPERATION
RANGE
40°C ÷ 82°C
By pushing the buttons “+” o “-“,you can see on
the display (for 4 seconds) the set temperature.
Through the parameters 425 (min) and 426 (max) is possible to set the maximum and the minimum heating
temperature.
HEATING
REQUEST
Three-way valve ON
Pump ON
The heating request can be performed by: room
thermostat 1, room thermostat 2, programming
clock, REMOCON and room sensor. Icon
and set temperature will be displayed.
When the boiler is at rest the valve is on the
“sanitary” position. When heating is turned on
the motor is supplied (inside shaft in), that
closed the outlet of the secondary exchanger
and puts pump intake in communication with the
heating circuit
The circulating device start is delayed 7 seconds
after heating request in order to allow switching
the 3 way valve; when it starts, the circulating
device intakes the water coming from the
heating system backflow and sends it to the
primary exchanger
7 seconds
Fan ON
The Fan is supplied (sealed chamber models)
segue

Training manual CLAS X
Pag. 13 di 69
BURNER
IGNITION
Flame detection
CONTROL
segue
The check is made with heating return and
delivery probes.
ΔT del-ret and the delivery and return
temperatures of the rising speed are checks. The
pressure is checked by a minimum pressure
switch
WATER FLOW CHECK
The gas is supplied to:
To 80% of the set power for Soft Ignition,
adjustable with parameter 220
Flame ionization if checked. (by the detection
electrode).
Display 5 P1 will indicate if there is no ignition
and there will be a second attempt with 90% of
the set power for the Soft Ignition , if it is
unsuccessful, it will be indicated by
5 P2 , the third attempt is carried out with 100%
of the set power for the Soft Ignition. If the third
attempt is unsuccessful block shutdown will
occur 5 01 .
Safety time 8 sec.
Spark Generator
and gas valve ON
Occurs after air pressure switch enabling
Air pressure switch enabling allows to pass to
the following phase (after the enabling the air
pressure switch is not checked up to the
following restart anymore).
If this doesn’t occur, after 20 seconds, the boiler
will stop for safety 6 P1 the Fan remains on
waiting for consent (sealed chamber models).
On the open chamber models instead a
thermostat control is performed (which continues
even while it is operating). If the Flue Control
thermostat is enabled there will be a block
shutdown 6 01 .
Air pressure
switch
CONTROL

Training manual CLAS X
Pag. 14 di 69
The pump has 2 speeds that are operated by
the control of the heating delivery-return ΔT. It
is operated as follows:
ΔT del-ret < ΔT – 2°C → V2 pump speed
Δt del- ret > ΔT → V3 pump speed
where: ΔT= 20°C (default value can be
sent by parameter 239 between 10 and
30°C).
Speed switching is carried out with a 5 minute
delay (non-settable value) raising or
diminishing.
PUMP
Speed control
Performed from the flow and return NTC. If
the temperature rise 102°C a lock out occurs,
indicated on the display with 1 01.
Overheat control
NORMAL BOILER OPERATION
After flame detection the boiler is free to
modulate the power according to the required
thermal load. Modulation is carried out
between the maximum heating power values
(adjustable from the control panel with
parameter 231) and the minimum power
value (set made on the gas valve). The shut
down temperature of the burner is operated
as follows:
1° min after flame detection:
T off = T set-point + 8°C
2° min after flame detection:
T off = T set-point + 6°C
starting from the 3rd min after flame
detection:
T off = T set-point + 4°C
This logic is used to prevent the burner from
shutting down too quickly with the system at
temperature.
Next ignition can be delayed from 0 to 7
minutes (default value = 2 min., adjustable
from the control panel with parameter 236)
FLAME
MODULATION
N.B. Starting from heating request, the “limit temperature” (88°C, not adjustable fixed
value) remains on executed by the primary exchanger outlet probe (NTC 1).
If there is a bad circulation through the heating system, the automatic by-pass can be
opened (max capacity 350 l/h).

Training manual CLAS X
Pag. 15 di 69
2.2 SANITARY MODE: OPERATING LOGIC
OPERATING
RANGE
36°C ÷ 60°C
By pushing the buttons “+” o “-“,you can see
on the display (for 4 seconds) the set
temperature
DEMAND FOR
DOMESTIC HOT
WATER
three-way valve
Heating
ON
Heating
OFF
Switch shaft
position
Shaft position is
OK
A demand for Domestic hot water, is detected
by the flow switch.
Now the boiler will be working on the
SANITARY mode. The display will show icon
with the set temperature for sanitary.
When the boiler is on stand-by the valve is
already on the SANITARY position.
If there is a demand while the boiler is operating
on HEATING mode, the three- way valve will be
switched on SANITARY.
During this passage the circulating device and
the burner remain on.
The outlet of the plate exchanger will be in
communication with the pump intake directed
towards the primary exchanger.
Pump ON
The pump (set on speed 3), intakes water
coming from the outlet of the secondary and
sends it to the primary exchanger
follows
Fan ON
The fan is supplied (sealed chamber models)
Air pressure switch
CONTROL
Air pressure switch enabling allows to pass to
the following phase.
If this doesn’t occur, after 20 seconds, the boiler
will stop for safety 6 P1 the Fan remains on
waiting for consent (sealed chamber models).
On the open chamber models instead a
thermostat control is performed (which
continues even while it is operating). If the Flue
Control thermostat is enabled there will be a
block shutdown 6 01 .

Training manual CLAS X
Pag. 16 di 69
follows
BURNER
ignition
Flame detection
CONTROL
Spark Generator
and gas valve ON
Occurs after air pressure switch enabling
The check is made with heating return and
delivery probes.
ΔT del-ret and the delivery and backflow
temperatures of the rising speed are checks. The
pressure is checked by minimum pressure
switch.
WATER FLOW CHECK
The gas valve is supplied at the set power for
the Soft Ignition (adjustable from the control
panel with parameter 220).
Flame ionization if checked. (by the detection
electrode).
Display 5 P1 will indicate if there is no ignition
and there will be a second attempt with 100% of
the set power for the Soft Ignition , if it is
unsuccessful, it will be indicated by
5 P2 , the third attempt is carried out with 100%
of the set power for the Soft Ignition. If the third
attempt is unsuccessful block shutdown will
occur5 01 .
Safety time 8 sec.

Training manual CLAS X
Pag. 17 di 69
NORMAL BOILER OPERATION
FLAME
MODULATION
Modulation occurs between the value of the
sanitary maximum power (set on the gas
valve) and the value of the minimum power
(also set on the gas valve).
The burner runs until the scale prevention
temperature is reached. The temperature is
checked by the return probe NTC2.
Performed from the flow and return NTC. If
the temperature rise 102°C a lock out occurs,
indicated on the display with 1 01.
Overheat control
To reduce the formation of scale in the
secondary exchanger.
During the D.H.W. mode the switch off and
switch on of the burner depends on the
following values of temperature:
T set
Antilime
temp.
limit
RE-
START
NTC1
(delivery
probe)
Not
influent.
85°C
81°C
NTC2
(return
probe)
> 52°C
65°C
64°C
<52°C
62°C
61°C
SCALE
PREVENTION
temperature
N.B.: The sanitary switch-off logic could be changed by the parameter 2 53:
–0 : Anti-scale (62 o 65°C) default
–1 : Set-point + 4°C

Training manual CLAS X
Pag. 18 di 69
3 SPECIAL FUNCTIONS.
3.1 FLUE CLEANER” Function.
This function is used to perform proper boiler combustion analysis and maximum and minimum gas
calibration.
Follow the instructions below to enable it:
PRESS
DISPLAY
The display will show this indication
Press Reset button for 5 continuous seconds
With the boiler on “Winter” mode, the 3-way valves is positioned on “heating” and the burner turns on
even without heating requested.
With the boiler on “summer” mode:
owithout sanitary demand the burner turns on in heating;
owith sanitary demand the burner turns on in sanitary.
The delivery temperature (NTC1) is checked during the “Flue cleaner” function, as follows:
“summer” mode → Off: 86°C; On: 81°C;
“winter” mode → Off: 89°C; On: 84°C.
Three different powers can be selected when the function is enabled, after the activation of the function the
boiler goes at the maximum heating power, after that is possible change it:
PRESS
DISPLAY
POWER
Push the butoon
“+”
Max sanitary
Push the butoon
“+”
Minimum
To exit the “Flue cleaner” function press the RESET button. However after 30 minutes the function will be
disabled automatically.

Training manual CLAS X
Pag. 19 di 69
3.2 “COMFORT” Function.
Moreover, by means of parameter 2 50 you can set comfort function as follows:
0:disabled;
1: enabled for 30 minutes after sanitary request;
2: always enabled.
The operating range is variable and depends on the temperature set for the sanitary mode:
TEMP. SET FOR SANITARY MODE
OFF TEMPERATURE
ON TEMPERATURE
36
40
34
37
41
35
38
42
36
39
44
38
40
45
39
41
46
40
42
47
41
43
49
43
44
50
44
45
51
45
46
53
47
47
54
48
48
56
50
49
58
52
50
59
53
51
61
55
52
63
57
53
64
58
54
66
60
55
68
62
56
70
64
57
71
65
58
72
66
59
73
67
60
74
68
This function reduces the hot sanitary water output time. The objective is reached by keeping the primary
circuit in the boiler hot. To enable this function push the comfort button.

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
1ST
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 1st CASE are still present (3°C<NTC1<8°C)
automatically check the EVENTS of the 2nd CASE
CONDITION
EVENTS
T TIME
2nd
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.