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Training Manual

FAMILY: 40litre wall-mounted gas boilers with storage tank

TYPE Condensation

NAME: CLAS B PREMIUM

MARK: ARISTON

Release: 1V0 21.11.2008

Séquence d’allumage du brûleur en mode sanitaire

Market Technical Support

CLAS B PREMIUM Training manual

Updates Updates

.

VERSION DATE NAME MODIFICATION

INDEXPage 2 of 66


1 GENERAL INFORMATION....................................................................................................................................5

1.1 DIMENSIONS & CLEARANCE..........................................................................................................................51.2 OVERALL VIEW..................................................................................................................................................61.3 WALL DIAGRAM.....................................................................................................................................................71.4 CONTROL PANEL...............................................................................................................................................8

2 FUNCTIONING.......................................................................................................................................................10

2.1 CENTRAL HEATING MODE............................................................................................................................102.2 DOMESTIC HOT WATER MODE....................................................................................................................132.3 ANTI-FREEZE FUNCTION.......................................................................................................................................23

3 SPECIAL FUNCTIONS..........................................................................................................................................24

3.1 "COMBUSTION ANALYSIS" FUNCTION”....................................................................................................243.2 ENERGY RECOVERY.......................................................................................................................................253.3 "CIRCULATION CONTROL" FUNCTION”....................................................................................................273.4 "AUTOMATIC DEAERATION" FUNCTION..................................................................................................283.5 CENTRAL HEATING RE-START TIMING” FUNCTION..............................................................................28

4 ADJUSTMENTS IN CENTRAL HEATING & DOMESTIC HOT WATER MODES....................................30

4.1 GENERAL TABLE OF THE GAS ADJUSTMENTS........................................................................................304.2 IN CENTRAL HEATING MODE......................................................................................................................30

5 HYDRAULIC UNIT................................................................................................................................................31

5.1 DETAILS OF THE HYDRAULIC UNIT...........................................................................................................315.2 DESCRIPTION OF THE HYDRAULIC UNIT..................................................................................................325.3 3 B VALVE/ BY-PASS.......................................................................................................................................335.4 PROBES.................................................................................................................................................................335.5 DRAINING VALVE...........................................................................................................................................335.6 CENTRAL HEATINGFILTER...........................................................................................................................345.7 V3V MOTOR......................................................................................................................................................345.8 DOMESTIC HOT WATER FLOW SWITCH....................................................................................................345.9 PRIMARY PUMP.....................................................................................................................................................355.10 STORAGE TANKS CARTRIDGE................................................................................................................365.11 DOMESTIC HOT WATER PLATE HEAT EXCHANGER.........................................................................365.12 DOMESTIC HOT WATER PUMP................................................................................................................375.13 PROPORTIONAL PRESSURE SENSOR.....................................................................................................375.14 PRIMARY AND DOMESTIC HOT WATER EXPANSION VESSEL........................................................375.15 SIPHON..........................................................................................................................................................38

6 COMBUSTION UNIT.............................................................................................................................................39

6.1 HEAT EXCHANGER BURNER........................................................................................................................406.2 BURNER.............................................................................................................................................................416.3 SIT SIGMA 848 GAS VALVE................................................................................................................................426.4 GAS VALVE ADJUSTMENTS...................................................................................................................................436.5 FAN.......................................................................................................................................................................446.6 IGNITER/IONISATION.............................................................................................................................................44

7 FLUE EXHAUST.....................................................................................................................................................45

7.1 CO-AXIAL SYSTEMS.......................................................................................................................................467.2 DIVIDED SYSTEMS................................................................................................................................................47

8 CIRCUIT BOARDS & PERIPHERALS...............................................................................................................48

8.1 MAIN CIRCUIT BOARD...................................................................................................................................488.2 WIRING DIAGRAM...........................................................................................................................................498.3 PERIPHERAL CONNECTION....................................................................................................................................50

8.3.1 Connections in the external electric box....................................................................................................508.3.2 Connections in the boiler electric box........................................................................................................51

8.4 ADJUSTMENTS AND SETTINGS MENU.......................................................................................................528.4.1 MENU NAVIGATION GUIDE...................................................................................................................528.4.2 MENU 2: BOILER MAIN PARAMETERS.................................................................................................548.4.3 MENU 3: SOLAR & STORAGE TANK......................................................................................................55

Page 3 of 66


8.4.4 MENU 4: ZONE 1 PARAMETERS.............................................................................................................568.4.5 MENU 5: ZONE 2 PARAMETERS.............................................................................................................578.4.6 MENU 7: SPECIAL FUNCTIONS: COMBUSTION ANALYSIS AND PANT BLEEDING MODES........588.4.7 MENU 8: AFTER-SALES ASSISTANCE PARAMETERS..........................................................................58

8.5 FUNCTIONING ANOMALIES..........................................................................................................................608.5.1 ERROR CODES ON THE DISPLAY..........................................................................................................60

9 COMMISSIONING.................................................................................................................................................62

10 PERIODICAL CHECKS..................................................................................................................................63

11 TECHNICAL DATA.........................................................................................................................................65

Page 4 of 66


1 GENERAL INFORMATION

1.1 DIMENSIONS & CLEARANCE

KEYB Hot water flowD Cold water inletA Central heating flowC Gas inletE Central heating return

Page 5 of 66


1.2 OVERALL VIEW

KEY1. Flue exhaust 16. Central heating filter2. Manual deaerator 17. Domestic hot water flow switch3. Burner 18. Primary pump4. Flame detection 19. ON/OFF pressure sensor5. Storage tanks cartridge 20. V3V6. Primary return probe (NTC2) 21. Silencer7. Primary flow probe (NTC1) 22. Fan8. Gas valve 23. Ignition electrode9. Domestic hot water plate heat exchanger 24. Igniter10. 7 bar domestic hot water valve 25. Thermofuse11. Siphon 26. Combustion analysis12. 3 bar primary valve 27. Central heating expansion vessel13. Domestic hot water probe (NTCS) 28. Storage tank probe (NTCT)14. Primary pump 29. Domestic hot water expansion vessel15. Electric connection box

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1.3 WALL DIAGRAM

KEY1. Deaerator 16. Domestic hot water pump2. Primary return probe NTC2 17. Valve3. Primary flow probe NTC1 18. Domestic hot water probe NTCS4. Auxiliary storage tank 19. Manometer5. Main storage tank 20. ON/OFF pressure sensor6. Storage tank sensor (NTCT) 21. V3V7. Storage tank discharge valve 22. Primary pump8. 3 bar safety valve 23. Primary expansion vessel9. By-Pass 24. Thermofuse10. Domestic hot water expansion vessel 11. Domestic hot water flow switch A Central heating flow12. 7 bar domestic hot water safety valve B Hot water outlet13. Central heating filter C Gas inlet14. Filling cock D Cold water inlet15. Primary circuit discharge valve E Central heating return

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1.4 CONTROL PANEL

KEY1. LCD Display 10. Menu adjustment key "+"2. "Reset" Key 11. Domestic hot water adjustment handle3. Red placed in safety light 12. Timer prearrangement (optional)4. Yellow storage tank exclusion light 13. ON/OFF key5. Manometer 14. Flame presence light6. Central heating adjustment handle 15. "Auto" functioning mode activation light7. Menu adjustment key "-"° 16. "Auto" function activation key8. "Menu" key 17. Storage tanks exclusion key9. "Esc" key

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Functioning mode indications on the display

During appliance functioning it is possible to check the boiler functioning mode on the left part of the display. A specific letter corresponds to each status:

DISPLAY DESCRIPTION BOILER STATUS

O - - Stand-By STAND-BY. No request. The 2 characters on the right indicate the temperature read by the primary flow probe (NTC1).

C - - Central heating mode, burner on

A central heating request is in progress. The 2 characters on the right indicate the temperature read by the primary flow probe (NTC1).

c - -Central heating mode, burner off or following a central heating mode

First case: the burner switches off in CH mode when the request is still active. The pump continues to function.Second case: at the end of the central heating request, the pump is in POST-CIRCULATION MODE for 2 minutes. The 2 characters on the right indicate the temperature read by the primary flow probe (NTC1).

d - -Domestic hot water withdrawal in progress, burner on

The boiler functions in domestic hot water withdrawal mode. The 2 characters on the right indicate the adjustment temperature of the domestic hot water set-point.

b - -Heating the domestic hot water storage tank

The boiler works in domestic hot water storage tank heating mode. The 2 characters on the right indicate the adjustment temperature of the domestic hot water set-point.

H - -In domestic hot water withdrawal mode, burner off

In domestic hot water withdrawal mode or if a domestic hot water request has just ended, the temperature of the primary circuit is high. Pump POST-CIRCULATION is activated. The 2 characters on the right indicate the adjustment temperature of the domestic hot water set-point.

F Anti-freeze function activated

The anti-freeze function is activated. It is managed by the primary flow probe NTC1.

S Solar system temperature

P1- Automatic deaeration function

Shown on the display

Domestic hot water circulation

Drop-down menu Boiler status signal

From 0 to 1.6 l/min “SUMMER” / “WINTER” or “Storage tank” “O” or “b”

From 1.6 to 4 l/min “SUMMER” / “WINTER” or “Storage tank” or "Domestic hot water"

“O” or “b” or “d”

> 4 l/min “Domestic hot water” “d”

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2 FUNCTIONING2.1 CENTRAL HEATING MODE

Page 10 of 66

Primary pump

V3V

Pressure & primary circulation control

Fan

Igniter

Gas valve

Flame control

Modulationburner

1 2

3

4 5 6 7 8

Central heating request

ADJUSTMENT RANGE

LT = From 20°C to 45°C HT = From 35 to 82°C

The set-point temperature reading is shown on the display for 4 seconds every time action is made on the central heating knob.

Central heating request

2. Primary pump power supply

3. Pressure and circulation control of the primary circuit

5. Burner ignition: igniter, gas valve and fan power supply

1. Shifting of the V3V to the central heating position

6. Flame presence control 7. Burner modulation 8. End of the demand:post-ventilation

4. Cleaning the combustion chamber and ignition electrodes: fan and electrodes power supply


Details of functioning in central heating mode

Page 11 of 66

CENTRAL HEAT.

REQUEST

Activated by:Programming deviceRoom thermostatRoom sensorRemote control

1. Shifting of the 3-way valve to the central heating

position

The V3V goes to the central heating position (the rest position is in domestic hot water mode). The operation is carried out in 6.5 seconds.

2. Primary pump power supply The pump is powered 7 seconds after the

V3V to prevent any water hammering in the system.

4. Cleaning the combustion

chamber and ignition electrodes

The fan is powered at 3,000 rpm for 5 seconds in order to clean the combustion chamber.

The igniter is powered for 1.5 seconds (without switching the fan off) in order to clean the ignition electrodes.

5. Burner ignition: igniter, gas valve

and fan power supply

The igniter, gas valve and fan are powered at ignition power.

3. Pressure & circulation control

of the primary circuit

The pressure in the primary circuit is checked constantly by the pressure sensor while the circulation is checked by the 2 primary probes NTC1 and NTC2.


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7. Burner modulation

Burner modulation is obtained by changing fan speed.The maximum heat output in central heating mode can be adjusted using the parameter 2 31.

To prevent any hasty burner ignition and switch-off, on start-up the switch-off temperature is fixed at the values indicated below:

► within the first min after flame detection: T°OFF = T° set-point + 8°C► within the second min after flame detection: T°OFF = T° set-point + 6°C► within the third min after flame detection: T°OFF = T° set-point + 4°C

8. End of the request:

post-ventilation

At the end of the central heating request the fan is powered at 3,000rpm for 5 seconds in order to clean the combustion chamber.

The flame presence control is performed by the ionisation electrode. During the ignition phase, the flame must be detected in less than 8 sec.

If this is not the case, another two attempts are made with a post-ventilation of 20 sec between one and the other.

If the third attempt fails, the boiler goes into safe conditions due to "No flame" 5 01.

6. Flame presence control


2.2 DOMESTIC HOT WATER MODE

Page 13 of 66

Domestic hot water pump

Primary pump

V3V

Pressure & primary circulation control

Fan

Igniter

Gas valve

Flame control

Domestic hot water adjustment

1 2

3

4 5 6

7

8

Domestic hot water request

ADJUSTMENT RANGE

From 40°C to 65°C The set-point temperature reading is shown on the display for 4 seconds every time action is made on the central heating knob.

Domestic hot water request

2. Power supply of the primary pump at high speed

3. Pressure and circulation control in the primary circuit

5. Flame presence control

1. Shifting of the V3V to the domestic hot water position (if not already there)

6. Domestic hot water pump power supply

7. Domestic hot water adjustment

8. End of the request

4. Burner ignition: igniter, gas valve and fan power supply


Details of functioning in domestic hot water mode

Page 14 of 66

Domestic hot water REQUEST

Activated by:Flow switchStorage tank probe

1. Shifting of the 3-way valve to the

domestic hot water mode

The V3V goes to the domestic hot water position, if not already there.The operation is carried out in 4 seconds.

The primary pump is powered at maximum speed.

4. Burner ignition: igniter, gas valve

and fan power supply

The igniter, gas valve and fan are powered at ignition power.

5. Flame control

The flame presence control is performed by the ionisation electrode. During the ignition phase, the flame must be detected in less than 8 sec.

If this is not the case, another two attempts are made with a post-ventilation of 20 sec between one and the other.

If the third attempt fails, the boiler goes into safe conditions due to "No flame" 5 01.

7. Domestic hot water adjustment

The domestic hot water adjustment is performed according to the functioning mode (central heating storage tank or domestic hot water withdrawal), see explanations.

8. End of the demand:

post-ventilation

3. Pressure and circulation control

of the primary circuit

The pressure in the primary circuit is checked constantly by the pressure sensor while the circulation is checked by the 2 primary probes NTC1 and NTC2.

2. Primary pump power supply

6. Domestic hot water pump power

supply

The domestic hot water pump is powered when the temperature read by the primary flow probe NTC1 is the same as the domestic hot water set-point temperature -5°C.

The fan is powered at 3,000 rpm for 5 seconds at the end of the domestic hot water request in order to clean the combustion chamber.


Detail of the domestic hot water adjustment: in storage tank heating mode

Detail of the domestic hot water adjustment: in domestic hot water withdrawal modePage 15 of 66

Domestic hot water pump power supply

Domestic hot water pump modulation

P calculated> Pmax

Burner adjustment:

Pmin<P calculated<Pmax

Following the ignition cycle, to be certain that the primary circuit is hot, domestic hot water pump start-up is subject to a condition:the temperature of the primary read by NTC1 must be above the domestic hot water set-point - 5°C.

The domestic hot water pump modulates in 2 cases:

- when the power calculated is above the P max of the boiler, the domestic hot water pump modulates with an ON/OFF system;

- when the value read by the domestic hot water probe NTCS is below the domestic hot water set-point.

Burner adjustment is performed depending on the domestic hot water probe NTCS.

Switch-off of the burner depending

on

P calculated < Pmin

The burner switches off if:NTC1 > 90°C orNTCS > T° set-point + 6°C for 4 secondsand switches back on if:NTC1 < 85°C andNTCS < T° set-point

End of the requestCentral heating is satisfied when the temperature read by the storage tank probe is the same as the set-point temperature.NTCT = Domestic hot water set-point

A storage tank heating request is made if the temperature read by the storage tank probe is 10°C lower at the domestic hot water set-point.Functioning is identical between 0 and 1.6 l/min

Burner ignition sequence in

domestic hot water mode

See explanation on previous page.


Page 16 of 66

Domestic hot water pump power supply

Domestic hot water pump modulation

P calculated> Pmax

Burner adjustment:

Pmin<P calculated<Pmax

Following the ignition cycle, to be certain that the primary circuit is hot, domestic hot water pump start-up is subject to a condition: the temperature of the primary read by NTC1 must be above the domestic hot water set-point- 5°C.

The domestic hot water pump modulates in 2 cases:

- when the power calculated is above the P max of the boiler, the domestic hot water pump modulates with an ON/OFF system;

- when the value read by the domestic hot water probe NTCS is below the domestic hot water set-point.

Burner adjustment is performed depending on the domestic hot water probe NTCS.

Switch-off of the burner depending

on

P calculated < Pmin

The burner switches off if:NTC1 > 90°C orNTCS > T° set-point + 6°C for 4 secondsand switches back on if:NTC1 < 85°C andNTCS < T° set-point

End of the request

In domestic hot water withdrawal

mode

Case N°1: circulation between 1.6 and 4 l/min Ignition sequence if:NTCT < T° set-point – 4°CCase N°2: circulation > 4 l/minImmediate switch-on sequence:

On flow switch turbine switch-off and if the temperature read by the storage tank probe is the same as the domestic hot water set-point.


CASE N°. 1: STORAGE TANK HEATING MODE

The main storage tank probe NTCT gives the ignition order for heating the storage tanks when its value is 10°C lower with respect to the domestic hot water set-point. The letter “b” is shown on the display.

The burner ignition cycle is activated. The domestic hot water pump is powered when the temperature read by the probe NTC1 is the same as the domestic hot water set-point temperature - 5°C; the heated water is made to circulate through the plate heat exchanger then in the main storage tank and then the auxiliary storage tank.

Burner adjustment is managed by the domestic hot water probe NTCS at the plate heat exchanger outlet. The burner switches off definitively when the temperature read by the storage tank probe NTCT is the same as the set-point temperature.

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Domestic hot water interface

Auxiliarystorage tank

Auxiliarystorage tank Domestic hot water heat

exchanger

Domestic hot water

pumpValve

NTC

T

NTC

1

NTC

2

NTCS

Boiler primary flow

Boiler primary return

Primary pump

9 l/min


CASE N°. 2: WITHDRAWAL from 1.6 to 4 l/min with domestic hot water pump off

When the domestic hot water circulation value read by the flow switch is between 1.6 and 4 l/min and the temperature of the storage tank is higher than the set-point - 4°C, the domestic hot water pump is off. The cold water enters the auxiliary storage tank as long as the valve positioned after the pump is closed.

The hot water withdrawn comes from the main storage tank. This configuration allows to prevent the introduction of cold water directly into the main storage tank. The letter “O” is shown on the display.

In this way the total capacity of the storage tanks is used without consuming energy.

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3 l/min

3 l/min




exchanger

Domestic hot water

pumpValve

NTC

T

Cold water inlet

Hot wateroutlet

NTC

1

NTC

2

NTCS

Boiler primary flow


0 l/min

3 l/min3 l/min

Primary pump


CASE N°. 3: WITHDRAWAL from 1.6 to 4 l/min with domestic hot water request in progress

When the T° read by the storage tank probe NTCT is 4°C lower than the domestic hot water set-point, a domestic hot water request is activated. The letter “b” is shown on the display.

The domestic hot water pump is powered when the temperature read by the probe NTC1 is the same as the domestic hot water set-point temperature - 5°C.

The valve opens and circulation in the plant is 9 l/min (domestic hot water pump circulation), the domestic hot water coming from the plate heat exchanger circulates partly in the main storage tank and powers the withdrawal point and filling of the auxiliary storage tank.

Given that the circulation of the domestic hot water pump (9 l/min) is higher than withdrawal circulation, a source of hot water moves from the auxiliary storage tank towards the main storage tank. When this hot source reaches the storage tank probe NTCT, the domestic hot water request is interrupted and goes back to functioning cycle N°.2.

Page 19 of 66

6 l/min

3 l/min




exchanger

Domestic hot water

pumpValve

NTC

T

Cold water inlet

Hot wateroutlet

NTC

1

NTC

2

NTCS

Boiler primary flow


9 l/min

3 l/min3 l/min

Primary pump


CASE N°. 4: WITHDRAWAL from 4 to 9 l/min

When the domestic hot water circulation value read by the flow switch is greater than 4 l/min, a domestic hot water request is activated. The letter “d” is shown on the display.

The domestic hot water pump is powered when the temperature read by the probe NTC1 is the same as the domestic hot water set-point temperature - 5°C. The valve opens and the domestic hot water coming from the plate heat exchanger partly circulates in the main storage tank and powers the withdrawal point.

Given that the domestic hot water pump circulation (9 l/min) is greater than the withdrawal circulation, a flow of hot water moves from the auxiliary storage tank towards the main tank.

Page 20 of 66

1 l/min

8 l/min




exchanger

Domestic hot water

pumpValve

NTC

T

Cold water inlet

Hot wateroutlet

NTC

1

NTC

2

NTCS

Boiler primary flow


9 l/min

8 l/min8 l/min

Primary pump


CASE N°. 5: WITHDRAWAL exceeding 9 l/min

When the domestic hot water circulation value read by the flow switch is greater than 9 l/min, a domestic hot water request is activated. The letter “d” is shown on the display.

The domestic hot water pump is powered when the temperature read by the probe NTC1 is the same as the domestic hot water set-point temperature - 5°C. The valve opens and the domestic hot water coming from the plate heat exchanger partly circulates in the main storage tank and powers the withdrawal point.

The withdrawal circulation escapes from the plate heat exchanger and the main storage tank at the same time. Given that the withdrawal circulation is higher than domestic hot water pump circulation, a source of cold water moves from the auxiliary storage tank towards the main storage tank. When this cold water reaches the storage tank probe NTCT, a new domestic hot water set-point calculation is performed in order to compensate the loss of temperature from the storage tank.

Page 21 of 66

2 l/min

11 l/min




exchanger

Domestic hot water

pumpValve

NTC

T

Cold water inlet

Hot wateroutlet

NTC

1

NTC

2

NTCS

Boiler primary flow


9 l/min

11 l/min11 l/min

Primary pump

9 l/min


FUNCTIONING OF THE DOMESTIC HOT WATER PUMP

In all cases, when the domestic hot water pump is powered, an intermittent control mode can be used (PWM) to obtain the correct temperature of the water at the outlet of the plate heat exchanger when the power calculated is higher than the maximum output of the burner.

Example: in the case of a 25 KW boiler, if the pump should turn continuously at 9 l/min with a set-point of 65°C (DT 55°C with EF at 10°C), the power calculated would be 35 KW. Therefore, the domestic hot water pump circulation must be reduced to maintain the desired temperature for as long as possible.

A calculation is made as a percentage of the functioning times and the pump power supply passes from ON to OFF over a period of 3 seconds (example: for a percentage of 40% the pump is powered for 1.2 seconds and is switched off for 1.8 seconds).

If the pump is not powered for a period of 24 hours an anti-blocking cycle is activated.

ANTI-LEGIONELLA FUNCTION

This function is activated with parameter 3 20.

The storage tanks undergo a heating cycle in “Anti-legionella” mode if the temperature read by the storage tank probe NTCT is lower than 59°C for a period of 100 hours.

The cycle is interrupted when the value of the NTCT probe is equal to 65°C. However the temperature in the storage tank is kept between 65 and 59°C for the next 30 minutes.

During this cycle a text is shown in the display versions or "leg" in the digital versions.

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2.3 ANTI-FREEZE FUNCTION

The "anti-freeze" function is activated when the ON key on the control panel is on.

The boiler has a double anti-freeze protection: on the primary circuit and in the domestic hot water storage tanks.

Protection of the primary circuit

If the temperature detected by the primary flow probe NTC1 is between 3 and 8°C, the primary circuit pump is powered and the V3V is taken alternately to central heating and domestic hot water modes.

If the temperature is still below 8°C after 20 minutes, the burner ignites at minimum power.

Protection of the domestic hot water circuit

When the temperature read by the storage tank probe NTCT is lower than 10°C. If this occurs then both pumps are started at maximum speed and then the burner switches-on.

Anti-freeze functioning mode stops once the temperature read by the storage tank probe NTCT is greater than 15°Cor, if the temperature read by the Domestic hot water probe is lower than 5°C the Domestic hot water pump is powered for 1 minute.

Page 23 of 66


3 SPECIAL FUNCTIONS3.1 "COMBUSTION ANALYSIS" FUNCTION”

This function allows to perform combustion analysis at maximum and minimum output.To activate it, operate as described below:

ACTION DISPLAY

The display shows the following indications.Hold the "Reset" key down for 5 seconds

With the boiler in WINTER or SUMMER mode, the burner functions as indicated below:

o without domestic hot water request, the boiler functions in central heating mode.o for domestic hot water circulation exceeding 1.6 l/min, the boiler functions in domestic hot

water mode.

The primary flow probe (NTC1) controls the primary temperature during the “COMBUSTION ANALYSIS MODE” as follows:

DHW mode → Off: 86°C; On: 81°C; CH mode → Off: 89°C; On: 84°C.

In order to make “COMBUSTION ANALYSIS” easier, it is advised to perform it by opening a domestic hot water cock to maximum.Three different powers can be selected:

ACTION DISPLAY POWER

Press the + key

Maximum power in central heating mode

Press the + key again

Maximum power in domestic hot water

mode

Press the + key again

Minimum

To exit the “Combustion analysis” function, press the “RESET” key. The function disconnects automatically Page 24 of 66


after 10 minutes.

3.2 ENERGY RECOVERY

At the end of a central heating request, his function allows to recover the energy in the primary circuit in order to transmit it to the domestic hot water circuit.After functioning in central heating mode, the V3V is moved to the “domestic hot water” position and the pump is powered to recover the primary circuit heat in the domestic hot water storage tank until:

1 NTC2 > NTCt + 5°C (the temperature read by the primary return probe is higher that the storage tank temperature + 5°C);and

2 NTCt < 65°C (the temperature of the domestic hot water stored in the storage tank is lower than 65°C);and

3 NTCt < Tset + 10°C (the temperature of the domestic hot water stored in the storage tank is lower than the domestic hot water set-point temperature + 10°C).

Example:- primary return (NTC2) at 65°C- DHW set-point (Tset) at 55°C- reserve water temperature (NTCt) at 54°C

The pump is active given that 65°C is higher than 54°C+5°C, 54°C is lower than 65°C and 54°C is lower than 55°C +10°C.

Functioning in central heating

mode

Page 25 of 66


Energy recovery

Page 26 of 66


3.3 "CIRCULATION CONTROL" FUNCTION”CHECK WHEN ACTIONS

Modification of the flow T°

> 7°C/sec

(check every 100ms)

Continuous check (burner on), except the first 4 seconds after flame detection

1. Burner switch-off and display of the 1 P1 error:- 10 sec of post-circulation- 10 sec of post-ventilationThe boiler re-starts after 10 seconds.

2. If the error 1 P1 occurs another two times in an interval of 4 minutes, the boiler goes into safe conditions. The 1 03 error appears on the display and:- 20 sec of post-ventilation- 1 min of post-circulation.

Modification of the flow T°

> 20°C/secor

Modification of the return T°

> 20°C/sec

(check every 100ms)

Continuous check (burner on) and 7 seconds after burner switch-off or put into safe conditions due to overheating.

1. Put into safe conditions with display of error 1 04:- 20 sec of post-ventilation- 1 min of post-circulation.

Flow T° – Return T°

> 55°C

Continuous check (burner on) and 7 seconds after burner switch-off or put into safe conditions due to overheating

1. Burner switch-off and display of the 1 P2 error:- 10 sec of post-circulation- 10 sec of post-ventilation. The burner re-starts after 10 seconds.

2. If the same error occurs in the next 4 minutes, the burner switches off and the 1 P2 error is displayed:- 10 sec of post-circulation- 10 sec of post-ventilation.The burner re-starts after 10 seconds.

3. If the error occurs a third time in these 4 minutes, the boiler goes into safe conditions 1 05 :- 20 sec of post-ventilation- 1 min of post-circulation.

Return T° > Flow T° + 10°C

Continuous check (burner on)

1. If the error is detected for more than continuous 20 seconds, the burner switches off and the display shows the 1 P3 error:- 10 sec of post-circulation- 10 sec of post-ventilation.The burner re-starts after 10 seconds.

2. If the error is detected for more than 20 continuous seconds, another two times in an interval of 4 minutes, the boiler goes into safe conditions and the 1 06 error is displayed:- 20 sec of post-ventilation- 1 min of post-circulation.

Page 27 of 66


Return T° – Flow T°+ 30°C

Continuous check (burner on)

1. Put into safe conditions with display of error 1 07:20 sec of post-ventilation- 1 min of post-circulation

3.4 "AUTOMATIC DEAERATION" FUNCTION

This function allows the installer to deaerate the plant on filling the boiler and the heating circuit.

It is activated by the installer by the parameter 7 01 in the menus or holding the “ESC” button down for 5 seconds. The display shows code P 1– . The cycle has duration of 6 minutes. It can be deactivated by pressing the “ESC” button once.

The procedure is the following:

The cycle can be repeated several times.

3.5 CENTRAL HEATING RE-START TIMING” FUNCTION

Using parameter 2 35, it is possible to choose the type of burner re-start timing after switch-off linked to the primary flow probe:

0: manual 1: automatic.

MANUAL: using parameter 2 36, timing can be adjusted between 0 and 7 minutes.

AUTOMATIC: the burner re-start timing depends on the central heating set-point; see table:

Central heating set-point < 50°C 51-60°C 61-70°C 71-80°C > 80°C

Page 28 of 66

V3V in central heating mode

Pump ON 60 sec.

Pump OFF 30 sec.

V3V in domestic hot water mode

Pump ON 60 sec.

Pump ON 60 sec.

V3V in central heating mode

Pump ON 60 sec.

Pump OFF 30 sec.

Pump ON 60 sec.


Re-start timing (minutes) 5 4 3 2 1

Page 29 of 66


4 ADJUSTMENTS IN CENTRAL HEATING & DOMESTIC HOT WATER MODES

4.1 GENERAL TABLE OF THE GAS ADJUSTMENTS

Minimum fan speed: this parameter allows to adjust the minimum power at the burner. The percentage is equal to a useful power value between the minimum power (0) and the maximum power set with parameter 2 32.

Ignition speed: this parameter limits the useful power of the boiler during the ignition phase. The percentage is equal to a useful power value between the minimum power (0) and the maximum power set with parameter 2 20.

Maximum speed in domestic hot water mode: this parameter allows to adjust the maximum power at the burner. The percentage is equal to a useful power value between the minimum power (0) and the maximum power (99).

4.2 IN CENTRAL HEATING MODE

The power can be adjusted in central heating mode using menu 2 31. This parameter limits the boiler useful power. The percentage is equal to a power value between the minimum power (0) and the absolute power in menu 2 34.

Page 30 of 66

25 KW 35 KWG20 G31 G20 G31

Minimum fan speed (rpm) 1415 1415 1243 1243Minimum fan speed % (parameter 2 33) 5 5 1 1

Ignition speed (rpm) 3480 3480 3280 3280Ignition speed % (parameter 2 20) 50 60 50 60

Maximum speed in central heating mode (rpm) 4855 4855 4640 4640Maximum speed in central heating mode % (parameter 2 34) 85 85 80 80

Maximum speed in domestic hot water mode (rpm) 5414 5414 5027 5027Maximum speed in domestic hot water mode % (parameter 2

32)98 98 89 89

Gas diaphragm NON 4,15 NON 4,6Gas circulation

(NAT - m3/h) (LPG – Kg/h) Max. domestic hot water 2,65 1,94 3,65 2,68

Max. central heating 2,33 1,71 3,28 2,41Min. 0,58 0,43 0,74 0,54


5 HYDRAULIC UNIT

5.1 DETAILS OF THE HYDRAULIC UNIT

KEY1 Primary return probe (NTC2) 9 Domestic hot water flow switch2 Primary flow probe (NTC1) 10 Domestic hot water valve 7 b3 Storage tanks cartridge 11 Siphon4 Domestic hot water plate heat exchanger 12 Primary pump5 3 barvalve 13 ON/OFF pressure sensor6 Storage tank probe (NTCT) 14 V3V7 Domestic hot water pump 15 Domestic hot water expansion vessel8 Domestic hot water pump

KEY1 Main storage tank 2 Auxiliary storage tank

Page 31 of 66


5.2 DESCRIPTION OF THE HYDRAULIC UNIT

KEY1. 3 b valve unit / By pass 6. Domestic hot water plate heat exchanger2. Domestic hot water probe NTCS 7. V3V motor3. Primary circuit bleeding 8. Central heating expansion vessel4. Domestic hot water flow switch 9. Primary pump5. Central heating filter 10. ON/OFF pressure sensor

Page 32 of 66

ub -N

E C


5.3 3 B VALVE/ BY-PASS

The boiler is equipped with an automatic by-pass that allows to protect the plant in case of insufficient circulation, for example due to the closure of the thermostatic cocks. The circulation is adjusted by a valve and a spring that opens more or less depending on the effort.

The by-pass assures minimum circulation in the main heat exchanger of 350 l/h (opening pressure: 0.4bar). It is positioned behind the 3 bar primary valve.

5.4 PROBES

The boiler is equipped with four NTC type probes:

NTC1: Primary flow probe NTC2: Primary return probe NTCS: Domestic hot water probeNTCT: Domestic hot water storage tank probe

Table of values:

5.5 DRAINING VALVE

The main circuit can be drained using the draining tap placed underneath the boiler hydraulic group.

Page 33 of 66

TEMPERATURE (°C) RESISTANCE (kOmh)

0 2710 1720 1230 840 550 460 370 280 1,5


5.6 CENTRAL HEATINGFILTER

A heating filter is installed on the right hydraulic unit (see photo below) on the return of the heating circuit. The filter mesh has a section of 1.5 mm.

Proceed as follows to clean the filter.

5.7 V3V MOTOR

The movement of the sealing O-ring is ensured by a 230 volt motor. It is possible to disassemble it without emptying the plant (fixing realised with clamp, element N°2 previous page).

A compensation spring is integrated directly into the valve motor to limit effort when the shutter is at end run.

The valve is powered by the boiler circuit board. The motor has two small micro switches that allow, at end run, to electronically uncouple the valve.

Electric connections: Power supply

1 2 3

STM0011

Power supply: 230Vac.

Resistance of each winding: 10 kohms

WindingDomestic hot water position 2-1

Central heating position 2-3

Page 34 of 66

Central heating filter


5.8 DOMESTIC HOT WATER FLOW SWITCH

The domestic hot water circulation can be read using parameter 8 25 and using the INFO key.The flow switch turbine has two magnets. The more important the circulation, the quicker the turbine turns; the transmission of the information to the circuit board is performed by the reed relay.

A 12 l/min flow rate limiterB Flow switch bodyC TurbineD Cap with filter

Domestic hot water flow switch functioning can be controlled in two ways.

By measurement of the voltage on the CN14 of the circuit board (flow element)

- 0Vdc. = No circulation- 5Vdc. = No circulation- Between 2Vdc. and 3Vdc. = Circulation

ON for circulation < 1.6 l/min

OFF for circulation < 1.3 l/min

By measurement of the frequency on the CN14 of the circuit board (flow element)

Circulation in l/min 0 1,6 2 4 6 8 10 12Frequency in Hz 0 4,8 6 12 18 24 30 36

5.9 PRIMARY PUMP

The pump is a 15/6 HE-2 wilo type model.

The pump has two speeds. The status can be verified using the parameter 8 23. It is also possible to measure the voltage between feet 5 and 6 of the CN10 connector of the circuit board.

5.10 STORAGE TANKS CARTRIDGEThe storage tank cartridge is equipped with two 20 litre tanks.- A main storage tank

Page 35 of 66

B

Reed relay

145 Vac. : Fast0 Vac. : Slow


- An auxiliary storage tank

The storage tank is in food-certified stainless steel.

KEY1 Cold water inlet 6 Connection to the main storage tank (N°5)

2 Plate heat exchanger 7 Domestic hot water intake pump

3 Inlet water coming from the plate heat exchanger 8 Domestic hot water pump

4 Hot water outlet DT Storage tank bleeding

5 Connection to the auxiliary storage tank (N°6)

5.11 DOMESTIC HOT WATER PLATE HEAT EXCHANGERThe domestic hot water plate heat exchanger is fixed onto the right and left hydraulic units using two front-accessible screws.The stainless steel plates are deep-drawn and brazed to each other. Water-tightness is assured by four lip seals.

DOMESTIC HOT WATER PLATE HEAT EXCHANGER

Primary circuit side:the hot water coming from the primary heat exchanger enters into A and exits from B.

Secondary circuit side:the domestic cold water arrives in C and exits from D heated.

The passage of the liquids takes place in parallel and in opposite directions in order to guarantee maximum heat exchange.

Domestic hot water heat exchanger: 16 plates

5.12 DOMESTIC HOT WATER PUMP

The domestic hot water pump allows to make the domestic hot water circulate in the two storage tanks. An intermittent system (PWM) allows speed variation.

Page 36 of 66


A calculation is made as a percentage of the functioning times and the pump power supply passes from ON to OFF on an interval of 3 seconds (example: for a percentage of 40% the pump is powered for 1.2 seconds and is switched off for 1.8 seconds).

A valve is positioned at the outlet of the drain to prevent the circulation of water in case of a small domestic hot water withdrawal with pump OFF.

5.13 PROPORTIONAL PRESSURE SENSOR

The pressure sensor checks the primary circuit pressure in real time

Closed contact > 0.6 b Contact open < 0.4 b

When the contact is open, the boiler goes into safety conditions1 02 .

5.14 PRIMARY AND DOMESTIC HOT WATER EXPANSION VESSEL

Technical data regarding the primary expansion vessel

Vessel capacity10

litresMaximum temperature 90°CPre-inflation pressure 1 bPrimary circuit maximum pressure 3.0 b

Technical data regarding the domestic hot water

expansion vesselVessel capacity 2 litresPre-inflation pressure 1.5 barMaximum pressure 10 bar

5.15 SIPHON

Page 37 of 66


The siphon is integrated into the boiler and is positioned on the right of the hydraulic unit. It is connected to the lower part of the heat exchanger burner. As the amount of condensate can reach 2 litres per hour, the siphon must be connected to a suitable drain.

KEY1. Siphon

2. Siphon cap

Page 38 of 66

1

2

6 COMBUSTION UNIT

KEY1. Pre-mixing 4. Fan2. Gas valve 5. Burner3. Gas pipe 6. Heat exchanger pipes

KEY1. Burner 6. Gas valve2. Fan 7. Pre-mixing3. Silencer 8. Ionisation electrode4. Gas inlet 9. Ignition electrodes


5. Air inlet 10. Igniter

6.1 HEAT EXCHANGER BURNER

The heat exchanger burner is found in the combustion chamber and is fixed to the casing by two brackets. It includes: smoke box, manual bleed valve, thermofuse and unique connection for condensate recovery.

The generator pipes are in stainless steel (304 L / diameter: 18 mm / thickness: 0.8 mm). In order to obtain optimal heat exchange, the pipes are bent, flattened and narrow at a distance of 6 mm from each other.

Overhangs have been realised on the pipes in order to guarantee a variable distance between 1.5 mm and 2 mm between each pipe. The coils are assembled in series/parallel 2 to 2.

The heat exchanger burner is closed by a cover in composite material PP FG 30% & PPO.

The heat exchanger burner power varies depending on the number of pipes used:

Power N°. of pipes25 KW 3 pipes + 1 pipe35 KW 5 pipes + 1 pipe

A thermofuse protects the heat exchanger burner. When the combustion products temperature exceeds 167°C the thermofuse opens. The display shows error 6 10. The thermofuse cannot be supplied separately from the heat exchanger burner.

KEY1. Manual bleeding valve 3. Thermofuse2. Heat exchanger burner 4. Heat exchanger stainless steel pipes

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6.2 BURNER

The burner cylinder is in stainless steel with diameter of 70 mm. The length differs according to the power.

The burner is made up of two parts:

- an external perforated casing (small diameter) on which combustion develops.- an internal perforated casing (large diameter) for internal balance of the gas diffusion.

The burner is multigas (NAT & LPG).The burner has been set for nominal functioning with a percentage of excess air between 20 and 30%, i.e. 9% of CO2 on the entire functioning range with G20 and 10% with LPG.A low NOx system, linked to the distribution of the combustion flame and the containment of the burner in the heat exchanger (cold wall), allows to reach a very satisfying NOx content.

KEY1. Stainless steel burner

2. Ignition electrodes

3. Ionisation probe

Page 41 of 66

1

3

Power Length Venturi25 KW 104.6 mm Ø 42 mm35 KW 167 mm /


6.3 SIT SIGMA 848 GAS VALVE

The SIT 848 SIGMA gas valve is made up from two safety electrovalves and an air/gas self-adjuster with 1:1 ratio (gas pressure drop = air pressure drop). The gas flow rate of the valve is suitable for the intake air flow rate at the Venturi. The air flow rate is modulated by the variation of fan rotation speed.

Page 42 of 66

KEY1. Venturi2. Gas valve3. Safety coils4. Pressure point 5. Zero adjustment6. Gas/air adjustment


6.4 GAS VALVE ADJUSTMENTS

On the gas valve it is possible to adjust:

o gas/air adjustmento zero adjustment

The gas/air adjustment allows to adjust the value of CO2.

It must be carried out in cleaning mode at maximum power (see explanation § 3.1).

Adjustment must only be carried out using a CH 2.5 hexagonal spanner on the screw indicated by number 6 ( x ).

By loosening this screw, the amount of gas increases (for the same amount of air), therefore the CO2 increases. To obtain the opposite result, carry out the reverse operation.

* : Open case: reduce 0.3%

Zero adjustment this must only be performed if the difference of the CO2 value measured between the maximum and minimum power exceeds 0.5%.

This adjustment allows to “re-calibrate the 0” of the gas valve.

It must be carried out in cleaning mode at minimum power (see explanation § 3.1). The operation must be performed with caution.

Adjustment must only be carried out using a CH 4 hexagonal spanner on the accessible screw, removing the protection screw indicated by number 5 ( x ).

Ignition power at the burner

Power at the burner can be adjusted by means of the parameter 2 20. In this way the circuit board acts on the fan speed.

The formula is the following: ignition speed (rpm) = 1330 + ((5100 – 1330)/100 x V)

V = Value of the parameter 2 20

Page 43 of 66

CO2 value (closed case)*Type of gas 25 KW 35KWG20 20 mb 9,0% + - 0,2% 9,0% + - 0,2%G31 37 mb 10,7% + - 0,2% 10,0% + - 0,2% Pa

Pg

CO2

Q %

CO2

Pa

Pg

Q %


6.5 FANThe air/gas mixture coming from the Venturi and the gas valve is lead under pressure to the burner from the fan by means of the mixer arm.

The power at the burner is directly proportional to the fan rotation speed. Modulation is obtained directly from the control of the main board. The speed varies between 1415 and 5414 rpm for a 25 KW and between 1243 and 5027 rpm for a 35 KW.

Burner ignition speed is 3480 rpm for a 25 KW and 3280 rpm for a 35 KW.

Fan speed can be controlled by means of parameter 8 22.

6.6 IGNITER/IONISATION

Ionisation current exceeding 1 µA

1. Ignition electrode2. Ionisation electrodes

The igniter produces a tension of 14 KW between the ignition electrodes in order to ignite the burner. The ionisation electrode detects the flame when the current exceeds 1 µA.

1. Ignition electrode 3. Igniter2. Ionisation electrodes

Page 44 of 66

1

VenturiJointFan

KEY

Power Fan Diam. Venturi

24 KW 45 W Ø 17 mm35 KW 45 W Ø 25 mm

Flame

►

PCB110 v ~

IonisationIonisation electrode


7 FLUE EXHAUSTThe boiler has a co-axial outlet of 60 / 100 mm for the extraction of combustion products and the introduction of fresh air.

It has two fresh air inlets Ø 80 mm (supplied closed) in the case of the divided system.

KEY1. 60/100 g flue collector 3. Removable cap2. Combustion analysis points 4. Divided adapter (supplied with drain kit)

Page 45 of 66


7.1 CO-AXIAL SYSTEMS

Type Power Length (m)

C1360/100

25 12

35 8

C1380/125

25 36

35 24

C3360/100

25 12

35 8

C3380/125

25 42

35 28

C4360/100

25 12

35 8

C4380/125

25 0

35 0

B3360/100

B3380/125

Page 46 of 66


7.2 DIVIDED SYSTEMS

Type Power Length (m)

C1380/80

25 36 (S1=S2)

35 24 (S1=S2)

C3380/80

25 60 (S1=S2)

35 40 (S1=S2)

C5380/80

25 84 (S1=S2)

35 56 (S1=S2)

C8380/80

25S1=1

(S2=83)

35 S1=1(S2=55)

B23/B23p80/80

2584 m

137 Pa

35 84 m128 Pa

Page 47 of 66


8 CIRCUIT BOARDS & PERIPHERALS

8.1 MAIN CIRCUIT BOARD

The main circuit board manages functioning and the boiler safety devices as functioning of the display.

It is protected by two 2A 230 Vac. fuses.

The tolerance for the power supply voltage is 230 Vac. +10% -15%.

Page 48 of 66


8.2 WIRING DIAGRAM

Page 49 of 66


8.3 PERIPHERAL CONNECTION

8.3.1 Connections in the external electric box

The following peripherals can be connected to the electric box located under the boiler:

boiler electric power supply; RT1 & RT2 room thermostat (or radiating floor thermostat); e-bus connection for the long distance control panel connection or the environmental sensor; external sensor with wires.

Page 50 of 66


8.3.2 Connections in the boiler electric boxIt is possible to connect the following in the boiler electric box:- E-bus board;- the solar board;- zone 2 module board (MGZ).

Page 51 of 66

board for the management of the modulating peripherals

E


8.4 ADJUSTMENTS AND SETTINGS MENU

The boiler has 8 different menus to adjust the different parameters.

Menu N°.

Content For the user For the technician

2 Boiler main parameters No Yes3 Solar system and storage tank parameters No Yes4 Adjustment of Central heating zone 1 parameters No Yes5 Adjustment of Central heating zone 2 parameters No Yes7 Activation of COMBUSTION ANALYSIS and plant bleeding functions No Yes8 After-sales service parameters No Yes

8.4.1 MENU NAVIGATION GUIDE

The Menu/OK programming key gives access to the different menus that allow to adapt burner functioning to the plant and user needs.

1. Press the “MENU/OK” key, menu “2” flashes on the left of the display.

The menu is used to set general boiler parameters.

2. To select the menu press the + and - keys. The menus run from 0 to 8 and are shown on the left of the display.

3. To select the menu, press the “MENU/OK” button.To access the menus from 2 to 8, the technician must introduce an access code (234) using the + and – keys and confirm again using the “MENU’/OK” key.

Page 52 of 66


4. Press the + and - keys to select the sub-menu.

5. To select the desired sub-menu, press the “MENU/OK” button.

6. Use the + and - keys to select the desired parameter.

7. To modify the parameter value, press the “MENU/OK” key. To modify it, press the + and - keys.

8. To save the set parameter value, press the “MENU/OK” key.

9. To escape from the menu press "ESC" several times until the temperature is displayed on the left of the display.

Page 53 of 66


8.4.2 MENU 2: BOILER MAIN PARAMETERSM

enu

Sub-

men

u

Para

met

erOperation Adjustment range Factory

value

2 1 Access Code Adjustment using the central heating knob 3. Value: 2 3 4 222

2 2 BOILER MAIN PARAMETERS2 2 0 Burner ignition power (as %) From 0 to 99

2 2 1Minimum T° in the home for the

activation of the anti-freeze function (°C). If a room sensor is

used.

From 2 to 10 5

2 2 3 Thermostat Selection 0: Floor safety thermostat1: Zone 2 room thermostat 0

2 2 5Elaboration timer of the central

heating request if an external kit is used

0: 0 sec1: 10 sec2: 90 sec

3: 210 sec

0

2 2 8 Boiler version 5: storage tank 5

2 3 MAIN CENTRAL HEATING ADJUSTMENTS - 2ND PART

2 3 1 Central heating system power From 0 to the value set in parameter 2 34

2 3 2 Maximum power in domestic hot water mode

From 0 to 99

2 3 3 Minimum power From 0 to 99

2 3 4 Absolute heating power From 0 to 99

2 3 5 Type of central heating anti-cycle timing

00: manual (Parameter adjustment 2 36)01: automatic (central heating set-point

function)1

2 3 6Central heating anti-cycle timing

(min). Activated by parameter 2 35= 0

From 0 to 7 3

2 3 7Duration of post-circulation Central heating post-circuit.

(min)

From 0 to 15CO: non stop 3

2 3 8 Pump speed in central heating mode

0: Fixed low speed1: Fixed high speed

2: Adaptive2

2 3 9 ΔT for pump modulation (°C) From 10 to 30 20

2 4 MAIN CENTRAL HEATING ADJUSTMENTS - 2ND PART

2 4 3 Post-ventilation in central heating mode

0: 5 sec 1 : 3 min 0

2 4 4 Boost time (min) From 0 to 60(when the SRA function is active) 16

2 4 7 Check for water presence in the primary circuit

0: heat probes only1: water pressure switch ON/OFF

2: pressure sensor2

2 5 DOMESTIC HOT WATER

2 5 0 Storage tanks T° maintenance status

0: Deactivated1 : “COMFORT” programmed

2 : Always active2

2 5 2Domestic hot water flow switch

action timer(water hammering) (dec)

From 5 to 200 5

Page 54 of 66


2 5 3 Not active

2 5 4 Domestic hot water post-ventilation and post-circulation

0: Post-ventilation: T°Man<75°C = No post-ventilation; T°Man>75°C = 3 min (minimum

speed); Post-circulation: 30sec1: Post-ventilation: 3min Post-circulation: 3min

0

2 5 5 Domestic hot water first return to central heating timing (min) From 0 to 30 0

2 9 FACTORY ADJUSTMENT RETURN MENU 2

2 9 0 Factory adjustment return of menu 2

YES: press the “MENU/OK” key.NO: press the “ESC” key.

8.4.3 MENU 3: SOLAR & STORAGE TANK

Men

u

Sub-

men

u

Para

met

er

Operation Adjustment range Factory value

3 0 GENERAL ADJUSTMENTS

3 0 0Temperature adjustment of the domestic hot water storage tank

(°C)(display only)

3 0 1 Not active From 5 to 25 15


3 2 SPECIAL ADJUSTMENTS

3 2 0 Anti-legionella function. Every 100 hours a cycle at 65°C.

0: Not active1: Active 0

3 2 3 ΔT collector x pump start-up (°C) From 0 to 30 8

3 2 4 ΔT collector x pump switch-off (°C) From 0 to 30 2

3 2 5 Minimum T° in the collector for pump start-up From 10 to 90 30

3 2 6 T° in the collector measurement cycle

0: Off1: On 0

3 2 7 Collector cooling function 0: Not active1: Active 0

3 2 8 Max. boiler contribution (°C) From 0 to 20 10

3 2 9 Collector anti-freeze T° (°C) From - 20 to 5 -20

Page 55 of 66

1.1.1 MENU 4: ZONE 1 PARAMETERS

CLAS B PREMIUM Training manual M

enu

Sub-

men

u

Para

met

erOperation Adjustment range Factory

value

4 0 ZONE 1 TEMPERATURE ADJUSTMENTS

4 0 0 Comfort T° of zone 1 (°C) only in the case of a room sensor From 10 to 30 19

4 0 1Economy T° of zone 1 (°C)only in the case of a room

sensorFrom 10 to 30 16

4 0 2 fixed boiler flow T° (if par. 421= 0) (°C)

From 25 to 85(with SRA mode activated)

40 (par 420 = 0)70 (par 420 = 1)


4 2 ZONE 1 ADJUSTMENTS

4 2 0 Zone 1 selection High T° or Low T° (only with clip-out)

0: Low T°1: High T° 1

4 2 1 Type of heat regulation used (SRA) on zone 1

0: fixed flow T° 1: Basic heat adjustment2: Only room sensor or rem. cont.3: External sensor only4: Only room sensor or rem. cont. + external T°

1

4 2 2 Zone 1 slope Active if 421 = 3 or 421 = 4

From 0_2 to 3_5(with SRA mode activated)

0_6 if 420=01_5 if 420=1

4 2 3 Zone 1 parallel movementActive if 421 = 3 or 421 = 4

From -20 to 20(with SRA mode activated) 0

4 2 4Compensation of the zone 1

room sensorActive if 421 = 2 or 421 = 4

From 0 to 20(with SRA mode activated) 20

4 2 5 Zone 1 (°C) max. central heating set-point threshold From 35 to 85

45 (par 420=0)82 (par 420 = 1)

4 2 6 Zone 1 (°C) min. central heating set-point threshold From 20 to 85

20 (par 420=0)35 (par 420 = 1)

4 3 SELF-DIAGNOSIS

4 3 0 Zone 1 room T° From 0 to 40°C(display only)

4 3 1 Zone 1 T° adjustment From 20 to 85°C(display only)

4 3 2 Zone 1 central heating request status

OFF: NoON: Yes

(display only)

4 3 3 Control of zone 1 external pumpOFF: off

ON: working(display only)

4 4 ZONE 1 CONTROL

4 4 0 Zone 1 pump control OFFON

Page 56 of 66


8.4.4 MENU 5: ZONE 2 PARAMETERSM

enu

Sub-

men

u

Para

met

er


5 0 ZONE 2 TEMPERATURE ADJUSTMENTS

5 0 0 Comfort T° of zone 2 (°C) only in the case of a room sensor From 10 to 30 19

5 0 1Economy T° of zone 2 (°C)only in the case of a room

sensorFrom 10 to 30 16

5 0 2 fixed boiler flow T° (if par. 521= 0) (°C)

From 25 to 85(with SRA mode activated)

40 (par 520 = 0)70 (par 520 = 1)


5 2 ZONE 2 ADJUSTMENTS

5 2 0 Zone 1 selection High T° or Low T° (only with clip-out)

0: Low T°1: High T° 1

5 2 1 Type of heat regulation used (SRA) on zone 2

0: fixed flow T° 1: Basic heat adjustment2: Only room sensor or rem. cont.3: External sensor only4: Only room sensor or rem. cont. + external T°

1

5 2 2 Zone 2 slope Active if 521 = 3 or 521 = 4

From 0_2 to 3_5(with SRA mode activated)

0_6 if 520=01_5 if 520=1

5 2 3 Zone 2 parallel movementActive if 521 = 3 or 521 = 4

From -20 to 20(with SRA mode activated) 0

5 2 4Compensation of the zone 2

room sensorActive if 521 = 2 or 521 = 4

From 0 to 20(with SRA mode activated) 20

5 2 5 Zone 2 (°C) max. central heating set-point threshold From 35 to 85

45 (par 520=0)82 (par 520=1)

5 2 6 Zone 2 (°C) min. central heating set-point threshold From 20 to 85

20 (par 520=0)35 (par 520=1)

5 3 ZONE 2 SELF-DIAGNOSIS

5 3 0 Zone 2 room T° From 0 to 40°C(display only)

5 3 1 Zone 2 flow T° From 0 to 120°C(display only)

5 3 2 Zone 2 return T° From 0 to 120°C(display only)

5 3 3 Zone 2 T° adjustment From 20 to 85°C(display only)

5 3 4 Zone 2 in central heating request mode

OFF: NoON: Yes

(display only)

5 3 5 Control of zone 2 external pumpOFF: off

ON: working(display only)

5 4 ZONE 2 CONTROL

5 4 0 Zone 2 test mode activation0 = OFF1 = ON

2 = Manual1

5 4 1 Zone 2 valve check

Page 57 of 66


5 4 2 Zone 2 pump control 0 = OFF1 = ON 0

5 4 3 Zone 2 valve check Kp

5 5 MULTI-ZONE

5 5 0 Central heating collector T°

5 5 1 Flow T° correction (°C) From -15 to + 15 0

8.4.5 MENU 7: SPECIAL FUNCTIONS: COMBUSTION ANALYSIS AND PANT BLEEDING MODES

Men

u

Sub-

men

u

Para

met

er


7 0 0 "COMBUSTION ANALYSIS" function

t¯¯ Domestic hot water max powert–– Central heating absolute max powert__ Min. power

t––

7 0 1 Plant bleeding function Press the “MENU/OK” key to activate it.

8.4.6 MENU 8: AFTER-SALES ASSISTANCE PARAMETERS

Men

u

Sub-

men

u

Para

met

er



8 2 BOILER

8 2 1 Extractor functioning status 0: Off1: On (display only)

8 2 2 Extractor speedX 100 rpm

From 0 to 28(display only)

8 2 3 Pump functioning status

0: Off 1= On at low speed

2 = On at high speed (display only)

8 2 4 Position of the 3-way valve (theoretical)

0= Domestic hot water 1= Central heating

(display only)

8 2 5 Circulation read from domestic hot water flow switch (l/min) (display only)

8 3 BOILER PROBES TEMPERATURE CONTROL

8 3 0 Central heating adjustment T° (°C)

(display only)

8 3 1 Primary flow T° read by the probe NTC1 (°C)

(display only)

8 3 2 Primary return T° read by the probe NTC2 (°C)

(display only)

8 3 3 Domestic hot water T° read by the probe NTCs (°C)

(display only)

8 4 SOLAR AND STORAGE TANK (if present)

8 4 0 Storage tank overheat. probe T° (°C) (display only)

8 4 1 T° in the solar collector (°C) (display only)

8 4 2 Domestic hot water inlet T° (°C) (display only)

8 4 3 Storage tank lower probe T° (display only)

Page 58 of 66


(°C)8 4 4 Not active

8 4 5 Solar pump timing (h) (display only)

8 4 6 Collector overheating timing (display only)

8 5 AFTER-SALES

8 5 4 Circuit board version (display only)

8 5 5 Circuit board software version (display only)

8 5 6 Bus software version (display only)

8 8 FAULT HISTORIC ARCHIVES

8 8 0Memory of the last 10 errors

occurring

For every error the order of appearance and the error N°. is displayed:►E-x : where x is the order of appearance of the error (x = 0 for the most recent and x = 9 for the oldest).Then:►xxx: where xxx is the type of error (see list)

8 8 1 Zeroing the errors memory YES: press the “MENU/OK” key.NO: press the “ESC” key.

Page 59 of 66


8.5 FUNCTIONING ANOMALIES

There are three types of anomaly:

1. putting into safety: it is a "definitive" block; to re-start the appliance the "Reset" button must be pressed;

2. deactivation: the boiler is in stand-by; when the error disappears it functions without any intervention;

3. functioning in emergency: the boiler functions but not at full potential; an error code appears on the display.

8.5.1 ERROR CODES ON THE DISPLAY

Every ode is made up from three characters: the first indicates the location of the error on the boiler. There are seven (see table below). The next two characters correspond to the title of the error.

The error code appears on the left of the display. When the boiler goes into safety error, "Reset" appears under the error code, which informs the user of the "definitive" block condition.A brief explanation text appears at the bottom of the display for each error code.

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First character of the error Positioning on the boiler

1 Primary circuit

2 Domestic hot water circuit

3 Electric circuit

4 Communication with peripherals

5 Ignition and detection

6 Air inlet/Combustion product outlet

7 Zones


CONDENSATION MODELError code Description Action

PRIMARY CIRCUIT1 01 Overheating Reset1 02 Pressure sensor anomaly (short circuit or no signal) Volatile1 03 No circulation or presence of water: modify Man T° > 7°C/sec (3 times successively) Reset

1 04 No circulation or presence of water: modify primary circuit T° > 20°C/sec or modify return T° > 20°C/sec Reset

1 05 No circ. or presence of water: T° Man – T° Ret > 55°C (3 times successively) Reset1 06 No circ. or presence of water: T° Ret > T° Man + 10°C (3 times successively) Reset1 07 No circulation or presence of water: T° Ret > T° Man + 30°C Reset1 08 Insufficient pressure in the primary circuit (P<Pmin) Volatile1 09 System pressure > 3 b Volatile1 10 Primary flow probe anomaly NTC1 (short circuit or no signal) Volatile1 12 Primary return probe anomaly NTC2 (short circuit or no signal) Volatile1 14 External sensor anomaly (short circuit or no signal) Volatile1 16 Floor sensor contact open Volatile1 18 Reading error on primary flow and return probe Volatile1 P1 No circulation or presence of water: modify T° man prim > 7°C/sec Signal1 P2 No circulation or presence of water: T° Flow – T° Return > 55°C Signal1 P3 No circulation or presence of water: Return T° > Flow T° + 10°C Signal1 P4 Insufficient pressure in the primary circuit: filling request Signal

DOMESTIC HOT WATER CIRCUIT2 01 NTCs domestic hot water sensor anomaly (short circuit or no signal) Volatile2 02 Solar storage tank lower part probe anomaly (short circuit or no signal) Volatile2 03 NTCt domestic hot water probe anomaly (short circuit or no signal) Volatile2 04 Solar collector probe anomaly (short circuit or no signal) Volatile2 05 Anomaly on solar inlet probe (short circuit or no signal) Volatile2 07 Overheating on the solar collector Volatile2 08 T° too low on solar collector Volatile2 09 Storage tank overheating Signal

CIRCUIT BOARD3 01 Anomaly on display board Eeprom Volatile3 02 Communication anomaly between the boards Volatile3 03 Anomaly on the main board Volatile3 04 "RESET" button pressed more than 5 times in less than 15 minutes Volatile

3 05 3 06 3 07 Anomaly on the main board Reset3 P9 "Envision maintenance" indication Cf. menu

COMMUNICATION WITH THE PERIPHERALS4 01 Communication anomaly between modem and the bus Volatile4 02 GPRS/GSM modem anomaly Volatile4 03 Modem Sim card anomaly Volatile4 04 Communication anomaly between modem and the circuit board Volatile

4 05 4 06 Modem anomaly Volatile4 07 Room sensor anomaly (short circuit or no signal) Volatile

IGNITION AND FLAME DETECTION5 01 No flame Reset5 02 Gas valve flame detection not powered Volatile5 P1 First ignition attempt failed Signal5 P2 Second ignition attempt failed Signal5 P3 Flame detachment during burner functioning Signal5 P4 3 flame detachments during burner functioning ON/OFF

AIR INLET/COMBUSTION PRODUCT OUTLET6 04 Insufficient extractor speed (<1775 rpm-100rpm) or no speedometer functioning signal Reset6 10 Thermofuse contact open Reset6 12 No speedometer signal on start-up Reset

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9 COMMISSIONING

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1. Check the connection and electric power supply.Validate …………………….

2. Check the type of gas (make the change using the suitable kit if necessary).

Validate …………………….

3. Check the gas connections.


4. Measure the inlet pressure of the gas at rest.


5. Check the flue exhaust system.


6. Fill the central heating plant.


7. Check hydraulic and drain connections.


9. Bleed the plant using the “Bleed” function (by pressing ESC for 5 seconds).


10. Change the display language (if necessary).


11. Adjust the time and date (if necessary).


12. Adjust maximum central heating power.


13. Adjust the central heating parameters depending on the system.Validate …………………….

15. Check domestic hot water circulation at the withdrawal points.


17. Measure the ionisation current at minimum power.Validate …………………….

18. Explains functioning to the user.


8. Release the pump if necessary.


14. Check the maximum and minimum power in domestic hot water mode.Validate …………………….

16. Measure combustion (“Combustion analysis” function, by pressing the RESET button for 5 seconds).Validate …………………….


10 PERIODICAL CHECKS

Domestic hot water plate heat exchanger

When: every year

How: measuring the DT at different domestic hot water circulations

By-pass & 3 b valve

When: every year

How: exterior aspect/cleanliness

Central heating filter

When: every year


Expansion vessel

When: every year

How: inflation pressure at 1 b

Domestic hot water flow switch control unit

When: every year

How: start circulation/exterior aspect/cleanliness

Ignition electrodes & ionisation probe

When: every year

How: exterior aspect/cleanliness/distance with the burner/ionisation current > 1 µA

Burner

When: every year

How: exterior aspect/cleanliness/flame aspect

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Fan

When: every year

How: exterior aspect/cleanliness - turbine

Generator burner

When: every year


Siphon

When: every year


Pump

When: every year

How: check that the rear deaerator is always open

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11 Technical data

General notes

Model 25 KW 35 KWCE Certification (pin) 0085BR0347

Ene

rgy

feat

ures

Max/min nominal calorific capacity (PCI) kW 22,0/5,5 31,0/7,0

Max/min nominal calorific capacity (PCS) kW 24,4/6,1 34,4/7,8

Max/min domestic hot water nominal calorific capacity (PCI) kW 25,0/5,5 34,5/7,0

Max/min domestic hot water nominal calorific capacity (PCS) kW 27,8/6,1 38,3/7,8

Max/min useful power (80°C-60°C) kW 21,6/5,2 30,3/6,7

Combustion yield (fumes) % 97,9 97,8

Yield at nominal calorific capacity (60/80°C) Hi/Hs % 98,0/88,2 97,6/87,9

Yield at 30% at 30°C Hi/Hs % 108,0/97,3 107,2/96,5

Yield at nominal calorific capacity (30/50°C) Hi/Hs % 107,0/96,4 107,0/96,4

Yield at minimum calorific capacity (60/80°C) Hi/Hs % 95,6/85,5 95,0/85,5

Leaks in off status (∆T=50°C) % 0,2 0,1

Fumes loss with burner functioning % 2,1 2,2

Performance stars (dir. 92/42/EEC) n° 4 4

Em

issi

ons

Available air pressure Pa 137 128

Combustion product temperature (G20) (80°C-60°C) °C 63 65

Level of CO2 (G20) (80°C-60°C) % 9,0 9,0

Level of CO (0%O2) (80°C-60°C) ppm < 100 < 100

Level of O2 (80°C-60°C) % 4,5 4,5

Nox Class n° 5 5

Excess air (80°C-60°C) % 27 27

Cen

tral h

eatin

g ci

rcui

t Expansion vessel capacity L 10 10

Max. content in the plant (75°C-35°C) L 190/500 190/500

Minimum functioning pressure bar 0,4 0,4

Maximum pressure bar 3 3

Expansion vessel inflation pressure Bar 1 1

Max/min central heating temperature (low T° range) °C 45/20 45/20

Max/min central heating temperature (high T° range) °C 82/35 82/35

Dom

estic

hot

w

ater

circ

uit Domestic hot water max/min temperature °C 65/40 65/40

Specific capacity (10 min with ∆T=30°C) Litres/min 19 23

Domestic hot water comfort stars (EN13203) n° 3 3

Hot water minimum flow rate Min litres 0,1 0,1

Storage tank capacity Litres 40 40

Electricity

Electric voltage/Frequency V/Hz 230/50 230/50

Absorbed electric power W 114 115

Electric plant protection rating IP X5D X5D

Apartment minimum room temperature °C 5 5

WeightWeight kg 57 60

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