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STMaE4E and 07/11

MAIOR EOLO 4 E

Technical Documentation

METHANE (G20)

BUTANE (G30)

PROPANE (G31)

PROPANE AIR (G230)

HEAT

OUTPUT

HEAT

OUTPUT

DHW

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

(kW)

(kcal/h)

/h)

(mbar) (mm H

(kg/h)

(mbar) (mm H

(kg/h)

(mbar) (mm H

/h)

(mbar) (mm H

24.0

20640

2.73

12.30 125.4

2.04

28.50 290.6

2.00

36.70 374.2

2.12

13.22 134.8

23.0

19780

2.62

11.42 116.5

1.96

26.23 267.5

1.92

33.75 344.2

2.03

12.38 126.2

22.2

19120

2.53

10.77 109.8

1.89

24.57 250.5

1.86

31.59 322.1

1.97

11.74 119.8

21.0

18060

2.40

9.77 99.6

1.79

22.03 224.7

1.76

28.30 288.6

1.86

10.76 109.7

20.0

17200

2.29

8.99 91.6

1.71

20.10 204.9

1.68

25.79 263.0

1.78

9.98 101.8

19.0

16340

2.18

8.24 84.0

1.63

18.26 186.2

1.60

23.42 238.8

1.69

9.23 94.1

18.0

15480

2.07

7.52 76.7

1.55

16.52 168.5

1.52

21.17 215.9

1.61

8.50 86.7

17.0

14620

1.96

6.82 69.6

1.47

14.88 151.7

1.44

19.05 194.3

1.52

7.79 79.4

16.0

13760

1.85

6.16 62.8

1.38

13.33 135.9

1.36

17.06 174.0

1.44

7.09 72.3

15.0

12900

1.75

5.52 56.3

1.30

11.87 121.0

1.28

15.19 154.9

1.35

6.41 65.4

14.0

12040

1.64

4.91 50.1

1.22

10.50 107.1

1.20

13.44 137.0

1.27

5.75 58.6

13.0

11180

1.53

4.32 44.1

1.14

9.22 94.0

1.12

11.80 120.4

1.19

5.10 52.0

12.0

10320

1.42

3.76 38.3

1.06

8.03 81.8

1.04

10.29 104.9

1.10

4.47 45.6

11.0

9460

1.31

3.22 32.8

0.98

6.92 70.6

0.96

8.89 90.7

1.01

3.86 39.3

10.0

8600

1.20

2.70 27.6

0.89

5.91 60.2

0.88

7.61 77.6

0.93

3.25 33.2

9.3

7998

1.12

2.36 24.0

0.84

5.25 53.5

0.82

6.79 69.2

0.87

2.84 29.0

8.0

6880

DHW

0.97

1.74 17.8

0.73

4.14 42.2

0.71

5.41 55.2

0.75

2.09 21.3

7.0

6020

0.86

1.30 13.3

0.64

3.40 34.7

0.63

4.50 45.9

0.66

1.53 15.6

METHANE (G20)

BUTANE (G30)

PROPANE (G31)

PROPANE AIR (G230)

HEAT

OUTPUT

HEAT

OUTPUT

DHW

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

BURNER

GAS FLOW

RATE

PRESS. NOZZLES

PRESSURE

(kW)

(kcal/h)

/h)

(mbar) (mm H

(kg/h)

(mbar) (mm H

(kg/h)

(mbar) (mm H

/h)

(mbar) (mm H

28.0

24080

3.14

11.70 119.3

2.35

28.05 286.1

2.31

35.87 365.8

2.44

12.20 124.4

27.0

23220

3.03

10.91 111.2

2.26

26.32 268.4

2.22

33.41 340.7

2.35

11.41 116.3

26.2

22516

2.94

10.28 104.8

2.19

24.95 254.5

2.16

31.48 321.0

2.28

10.79 110.0

25.0

21500

2.81

9.42 96.1

2.10

23.06 235.2

2.06

28.83 294.0

2.18

9.93 101.2

24.0

20640

2.70

8.73 89.0

2.02

21.52 219.5

1.98

26.71 272.3

2.09

9.23 94.1

23.0

19780

2.59

8.06 82.2

1.94

20.04 204.4

1.90

24.68 251.7

2.01

8.56 87.3

22.0

18920

2.49

7.43 75.8

1.86

18.61 189.8

1.83

22.76 232.1

1.93

7.92 80.8

21.0

18060

2.38

6.82 69.6

1.78

17.24 175.8

1.75

20.92 213.4

1.85

7.31 74.6

20.0

17200

2.27

6.24 63.7

1.70

15.91 162.3

1.67

19.18 195.6

1.76

6.72 68.6

19.0

16340

2.17

5.69 58.0

1.62

14.63 149.2

1.59

17.52 178.6

1.68

6.16 62.8

18.0

15480

2.06

5.16 52.6

1.54

13.39 136.6

1.52

15.94 162.5

1.60

5.62 57.3

17.0

14620

1.96

4.65 47.4

1.46

12.20 124.4

1.44

14.44 147.3

1.52

5.10 52.0

16.0

13760

1.85

4.16 42.4

1.38

11.04 112.6

1.36

13.02 132.8

1.44

4.60 46.9

15.0

12900

1.75

3.70 37.7

1.30

9.93 101.2

1.28

11.67 119.0

1.36

4.12 42.0

14.0

12040

1.64

3.26 33.2

1.23

8.85 90.2

1.21

10.40 106.1

1.27

3.66 37.3

13.0

11180

1.54

2.84 28.9

1.15

7.81 79.6

1.13

9.21 93.9

1.19

3.22 32.8

12.0

10320

1.43

2.44 24.8

1.07

6.80 69.3

1.05

8.08 82.4

1.11

2.80 28.5

11.2

9632

1.34

2.13 21.7

1.00

6.02 61.4

0.98

7.24 73.8

1.04

2.47 25.2

10.0

8600

DHW

1.21

1.70 17.3

0.90

4.89 49.9

0.89

6.06 61.8

0.94

2.01 20.5

9.0

7740

1.10

1.36 13.9

0.82

3.99 40.6

0.81

5.16 52.6

0.85

1.65 16.8

8.5

7310

1.04

1.20 12.2

0.78

3.55 36.2

0.77

4.74 48.3

0.81

1.48 15.0

Variable thermal output MAIOR EOLO 28

Variable thermal output MAIOR EOLO 24

Содержание MAIOR EOLO 24 4 E

Страница 1: ...MAIOR EOLO 4 E Instantaneous wall hung boilers sealed room with Aqua Celeris system MAIOR EOLO 4 E ...

Страница 2: ......

Страница 3: ...nti freeze safety devicethat protects it to a minimum temperature of 5 C optional to 15 C The hydraulic circuit has a bronze water gas heat exchanger and uses a new multi purpose hydraulic unit made from composite material ICHS which houses the pump and 3 way electric valve that allow the boiler water to circulate in the CH system or in a STAINLESS steel plate heat exchanger General features for t...

Страница 4: ...nections Key V Electrical connection G Gas supply AC Domestic hot water outlet ACV Solar valve kit DHW inlet Optional AF Domestic cold water inlet R System return M System flow Height mm Width mm Depth mm 781 440 340 CONNECTIONS GAS DOMESTIC HOT WATER SYSTEM G AC AF R M 3 4 1 2 1 2 3 4 3 4 N B connection group optional ...

Страница 5: ...peration in winter mode 10 Blocked boiler it needs to be unblocked by pressing the RESET button 11 Flame presence symbol and relative output scale 12 Central heating room phase function active 13 Solar function active 14 Anomaly present 15 Chimney sweep function in progress 16 DHW production phase function active 17 Domestic hot water temperature set 18 Boiler connected toV2 remote control optiona...

Страница 6: ...tem filling valve 9 Positive signal pressure point 10 Negative signal pressure point 11 Flue pressure switch 12 Flow probe 13 Flue hood 14 Safety thermostat 15 Primary heat exchanger 16 Ignition and detection electrode 17 System expansion vessel 18 Aqua Celeris 19 Burner 20 System pressure switch 21 Air vent valve 22 Boiler pump 23 Plate heat exchanger 24 3 way valve motorised 25 System draining v...

Страница 7: ... valve 3 Flow limiter 4 Domestic hot water probe 5 Aqua Celeris Resistance 6 Gas valve 7 Aqua Celeris 8 System expansion vessel 9 Burner 10 Primary heat exchanger 11 Flue hood 12 Sealed chamber 13 Flue pressure switch 14 Fan 15 Flow probe 16 Safety thermostat 17 Air vent valve 18 Boiler pump 19 System draining valve 20 System pressure switch 21 Plate heat exchanger 22 3 way valve motorised 23 By p...

Страница 8: ...ed with by pass excluded B Head available to the system at maximum speed with by pass inserted C Head available to the system at second speed with by pass excluded D Head available to the system at second speed with by pass inserted Head m H 2 O MAIOR EOLO 24 Head kPa Flow rate Litres h Head m H 2 O MAIOR EOLO 28 This depends on the position of the 3 way motorised valve 22 which allows flow toward...

Страница 9: ...em at maximum speed with by pass excluded B Head available to the system at maximum speed with by pass inserted C Head available to the system at second speed with by pass excluded D Head available to the system at second speed with by pass inserted MAIOR EOLO 32 Head m H 2 O Head kPa Flow rate Litres h A B C D ...

Страница 10: ...t exchanger with bronze pipes and fins that have the central heating flow NTC probe 6 and the overheating safety thermostat 2 positioned on their outlet flow The four pipes that it is made of are connected in series 1 It is connected to the pump flow and to the primary circuit flow using push fitting pipes 3 with O R seal 5 and locked with clips 4 The heat exchangers for versions 24 28 and 32 diff...

Страница 11: ...site material 2 Operation during the heating phase The counter spring 3 for the shutter 4 is not compressed heating position keeping the passage towards the DHW plate heat exchanger closed and the passage towards the system flow open Both the spring 3 and the shutter 4 are situated inside the body of the 3 way cartridge made from composite material 2 Operation in domestic hot water phase The hydra...

Страница 12: ...e the primary circuit Its seat is built into the pump group 3 and is coupled to a micro switch that prevents the burner from operating when the detected pressure is below 0 3 bar It prevents the primary heat exchanger from overheating Automatic air vent valve 2 This allows the gaseous substances that may be present in the boiler circuit to be automatically expelled It is mounted on the pump flow d...

Страница 13: ...ing seal N B when re mounting the air vent valve pay particular attention to inserting the relative O ring correctly 6 14 1 9 8 10 5 4 3 2 12 13 11 7 By pass cartridge replacement To replace the by pass cartridge 5 you need to pull out the relative locking clip 6 and then pull the cartridge out from the front N B when re mounting the by pass cartridge body be careful not to damage the gasket 3 bar...

Страница 14: ...p draws out pre heated water before sending it to the main heat exchanger This allows cold domestic water to absorb the heat contained in the water of the primary circuit even before the burner operates at full working capacity see domestic water exchanger and reduce the typical downtimes of instantaneous boilers The CH phase is excluded in this phase and priority is given to the production of DHW...

Страница 15: ...ectric resistance PTC 8 From the fitting 7 the water coming from the plate heat exchanger is directed into the tank From the probe pipe 5 the water inside the tank is drawn out by the vacuum created by the action of the boiler pump and sent back to the primary heat exchanger Once flow has ceased the water inside is kept warm with a special PTC electric resistance with timer 8 that supplies the wat...

Страница 16: ...ow water coming from the primary heat exchanger flow through the plate heat exchanger first 3 At the outlet of the plate heat exchanger by flowing through the pipe 2 the water collects inside the aqua Celeris tank 1 and is then drawn out by the boiler pump 1 which is connected to the Aqua Celeris tank with a pipe 6 and sent back to the primary heat exchanger 3 5 1 2 4 6 ...

Страница 17: ... lodged inside of it It is attached with two screws to the body of the DHW inlet 4 which in turn the system filling group is connected to A 2 bar 7 1 l min flow rate limitor 3 is inserted at the flow switch outlet for model 24 9 5 l min 2 bar for model 28 and 11 8 l min 2 bar version 32 DHW heat exchanger This is a water water heat exchanger compsed of STAINLESS steel plates laid one on top of ano...

Страница 18: ... gas valve SIT 845 The gas valve is equipped with two main coils 3 and a modulation coil 1 controlled by the integrated P C B The maximum and minimum outlet pressure values are calibrated on the valve see gas adjustments Main electric coils 3 They are two ON OFF coils that are powered 230 V AC by the integrated P C B when burner ignition is necessary They are connected electrically in parallel and...

Страница 19: ...ion electrode 4 Ignition and detection electrode 4 In the ignition mode it is controlled by the integrated P C B that causes an electric spark between its ends and the surface of the burner on the contact of which the air gas mix ignites Once the burner is on it detects flame presence on the burner allowing the integrated P C B to conclude the ignition cycle and to vary the gas pressure as require...

Страница 20: ...rass nut 3 to increase the pressure to the burner and in a clockwise direction to decrease it Minimum pressure adjustment this must be done after you have adjusted the maximum pressure after the power supply has been disconnected from the modulation coil turn the screw clockwise 2 to raise the pressure in the burner and counter clockwise to lower it Gas transformation The adaptation to the type of...

Страница 21: ...ingle plastic cap 6 Flue pressure switch signal pressure points 9 10 see the figure on the previous page There are two pressure points with screw closure positioned on the upper outside part of the sealed chamber These allow to measure the signal at the ends of the flue pressure switch 4 The negative pressure point 9 is fitted to a Y shaped pipe 11 which is then connected to the negative pressure ...

Страница 22: ... 3 42 4 3 Fan 3 The extractor operates downstream from the combustion chamber and is physically attached to the upper part of the hood 2 from where it draws out combustion products introducing them into the exhaust pipes to which the boiler is connected In the meantime it guarantees the flow of air inside the sealed chamber It is controlled by the integrated P C B and its functioning coincides ess...

Страница 23: ...t intake type C for installation outdoors in a partially protected place see figure at the side Using a relevant cover 1 to position on the upper part of the sealed chamber it is possible to install the boiler outdoors in partially protected places Intake Mounting the cover 1 requires removing the two caps 3 used to close the holes located on the top of the sealed chamber you then need to cover th...

Страница 24: ...nected to the relevant intake and exhaust terminal 4 The maximum total length allowed beyond the first bend 2 is 7 3 straight horizontal metres Configuration with sealed chamber and fan assisted circulation type C Exhaust The connection to the flue exhaust pipes takes place using a flange 1 or a flanged curve to fix to the fitting 4 present on the upper part of the sealed chamber placing a shaped ...

Страница 25: ...hat allow to create an air gap with the external concentric pipe of Ø 125 mm The maximum length allowed is 33 straight metres intake exhaust To prevent condensate problems the exhaust pipe must be limited to a max of 12 meters N B Under certain conditions it is necessary to install a diaphragm upstream of the intake pipe see boiler instruction book Ø 80 125 push fitting vertical concentric kit The...

Страница 26: ...nctioning S3 Reset block key S4 Domestic hot water flow switch S5 System pressure switch S6 Flue pressure switch S20 Room thermostat optional S31 On Stand by Off Button S32 Boost button T1 Ignition transformer T2 Boiler P C B transformer U1 Rectifier inside the gas valve connector Only available on Honeywell gas valves X40 Room thermostat jumper Y1 Gas valve Y2 Gas valve modulator ZONES CONTROL UN...

Страница 27: ...rimary circuit higher than minimum value the integrated P C B powers the pump M1 and the motor M of the 3 way valve M30 This functions until the end run switch 1 opens when the CH position is reached If the temperature detected by the NTC flow probe B1 is below the setting made on the boiler control panel with the CH temperature selector and if the flue pressure switch contact S6 is at rest NC the...

Страница 28: ...nce to the difference between the temperature set using the DHW temperature selector switch and the temperature detected by the DHW probe B2 Once the set value has been exceeded 5 C the burner shuts off and turns back on again once the temperature goes down again 4 C factory setting with correlated DHW set point By acting on the DHW Thermostat it is possible to set the boiler so that once the set ...

Страница 29: ...on the display screen by its symbol Depending on the type of activation the following functions are possible If only the DHW inlet probe is present if the temperature read by the inlet probe is equal to or greater than the setpoint 3K the burner and pump stay off The boiler will exit solar mode once the flow is complete or with the flow running when the temperature read by the inlet probe is lower...

Страница 30: ... burner ignition is necessary The SIT 845 gas valve is powered by the mains voltage the VK 4105 gas valve is powered by the straight mains voltage through a diode bridge U1 contained inside the gas valve connector Allows the passage of gas to the burner Gas valve Y1 main coils The P C B is always powered independently from the position of the button see integrated P C B functioning Integrated P C ...

Страница 31: ...ng the intergated P C B to read its temperature Its breakage signalled by relative anomaly nevertheless allows the boiler to continue working in the central heating and DHW mode Domestic hot water probe B2 NTC probe 10 kΩ 25 C Detects the external temperature and allows the integrated P C B to vary the flow temperature depending on the external temperature It is a resistance that can be varied pro...

Страница 32: ...rmally closed contact It is powered by the integrated P C B with variable direct current It allows you to change the gas pressure in the burner based on the required output Gas valve modulator Y2 Outputs It allows the connection of electronic devices e g zones control unit or DIMV2 Signal state optional It allows the connection of electronic devices e g Immergas zones digital control unit IMG BUS ...

Страница 33: ...hat generates a correct ionisation current without the gas valve being open with the duration of at least 20 seconds boiler functioning is blocked To re start the appliance press the Reset button and then make a central heating or domestic hot water request Parasite flame block If the contact of the water overheating safety thermostat is opened temperature of the primary circuit exceeding 100 C bo...

Страница 34: ...e combustion chamber is washed after switch off of the burner at the end of any request and the fan works for 30 seconds Sealed chamber post ventilation The breakage of the central heating flow probe B1 is signalled by the relative anomaly and prevents functioning both in the central heating and domestic hot water modes Flow NTC breakage B1 The breakage of the DHW outlet probe B2 is signalled by t...

Страница 35: ... function in progress 16 DHW production phase function active 17 Domestic hot water temperature set 18 Boiler connected to CARV2 optional 19 Operation with external temperature probe active optional 20 Aqua Celeris function active 21 Central heating temperature set 22 Boiler manometer 9 Operation in winter mode 10 Blocked boiler it needs to be unblocked by pressing the RESET button 11 Flame presen...

Страница 36: ... function is used to adjust the boiler so that it can operate with the correct type of gas nG Methane lG LPG Ci China The same as the type of gas being used S3 Boiler type Establishes the boiler type and its functioning mode 0 combi 1 24 kW storage tank 2 28 kW storage tank 3 32 kW storage tank 0 3 0 S4 Power block This establishes the boiler s ignition output 0 50 Functional as per the final test...

Страница 37: ... Solar panels coupling 0 30 seconds 0 P2 Pump functioning 0 Intermittent In winter mode the pump is managed by the room thermostat or by the remote control 1 Continuous In winter mode the pump is always powered and so functions continuously 0 1 0 P3 Relay 1 optional The boiler is set up for functioning with the relay P C B optional which can be configured 0 Off 1 Main zone control 2 General alarm ...

Страница 38: ...lay ignition 0 600 seconds 0 t3 Display lighting Establishes the display lighting mode 0 Automatic the display lights up during use and lowers after 15 seconds of inactivity In the case of anomaly the display flashes 1 Off the display is always lit with low intensity 2 On the display is always lit with high intensity 0 2 0 t4 Display This establishes what indicators 17 and 21 display on the dashbo...

Страница 39: ...C B anomaly 04 ERR 04 Flow probe anomaly 05 ERR 05 Domestic hot water probe anomaly 06 ERR 06 Maximum reset N has been reached 08 Not displayed Insufficient system pressure 10 ERR 10 Flue pressure switch failure 11 ERR 11 Configuration error 15 ERR 15 Parasite flame block 20 ERR 20 Push button control panel anomaly 24 ERR 24 Insufficient circulation 27 ERR 27 Loss of remote control communication 3...

Страница 40: ... 28 0 24080 32 0 27520 Domestic hot water adjustable temperature C 30 60 30 60 30 60 Domestic hot water circuit flow limiter at 2 bar l min 7 1 9 5 11 8 Min pressure dynamic domestic hot water circuit bar 0 3 0 3 0 3 Domestic hot water circuit max working pressure bar 10 0 10 0 10 0 Minimum D H W flow rate l min 1 5 1 5 1 5 Specific flow rate T 30 C l min 11 9 13 8 16 1 Drawing capacity in continu...

Страница 41: ...0 204 29 296 37 377 20 204 Flue flow rate at nominal heat output kg h 58 57 59 67 Flue flow rate at min heat output kg h 64 64 64 68 CO2 at Nom Q Min 7 35 2 05 8 65 2 40 8 40 2 40 7 70 2 30 CO with 0 O2 at Nom Q Min ppm 73 126 93 164 65 155 60 120 NOX with 0 O2 at Nom Q Min mg kWh 152 123 234 150 202 111 175 120 Flue temperature at nominal output C 110 114 112 105 Flue temperature at minimum outpu...

Страница 42: ...E G20 BUTANE G30 PROPANE G31 PROPANE AIR G230 HEAT OUTPUT HEAT OUTPUT CH DHW BURNER GAS FLOW RATE PRESS NOZZLES PRESSURE BURNER GAS FLOW RATE PRESS NOZZLES PRESSURE BURNER GAS FLOW RATE PRESS NOZZLES PRESSURE BURNER GAS FLOW RATE PRESS NOZZLES PRESSURE kW kcal h m3 h mbar mm H2 O kg h mbar mm H2 O kg h mbar mm H2 O m3 h mbar mm H2 O 28 0 24080 3 14 11 70 119 3 2 35 28 05 286 1 2 31 35 87 365 8 2 4...

Страница 43: ... 83 8 2 14 17 67 180 2 2 10 23 33 237 9 2 22 8 61 87 8 24 0 20640 2 76 7 70 78 5 2 06 16 44 167 6 2 03 21 81 222 4 2 14 8 03 81 9 23 0 19780 2 65 7 19 73 3 1 98 15 26 155 6 1 95 20 34 207 4 2 06 7 47 76 2 22 0 18920 2 55 6 69 68 2 1 90 14 12 144 0 1 87 18 91 192 8 1 98 6 93 70 7 21 0 18060 2 44 6 21 63 3 1 82 13 02 132 8 1 79 17 52 178 7 1 89 6 41 65 4 20 0 17200 2 34 5 74 58 5 1 74 11 97 122 0 1 ...

Страница 44: ...e dispenser kit code 3 016305 Solar inlet probe kit code 3 021452 Top cover kit code 3 020805 Digital weekly chrono thermostat code 3 014438 Radio chrono thermostat wireless code 3 014439 GSM telephone control kit code 3 017182 Telephone control code 3 013305 Configurable relay interface kit code 3 015350 Zones control unit kit code 3 011668 Solar valve kit code 3 018911 Universal connection kit c...

Страница 45: ...tch the boiler off and remove voltage from the appliance for at least 5 seconds This is to allow the boiler to start a new ignition cycle Ignition cycle CENTRAL HEATING MODE Press the general button and then press Turn the CH selector to maximum The boiler pump starts No Check the presence of theTA jumper on clamps 40 41 of the P C B N B the jumper must not be present when external devices are ins...

Страница 46: ...on 01 c Yes The error 27 appears on the display Yes See error section 27 The error 02 appears on the display Yes See error section 02 b No The boiler reaches and maintains the set central heating temperature No Check the Maximum heating output and adjust it to maximum if necessary See section D Yes The central heating request is satisfied The boiler reaches and maintains the set DHW temperature No...

Страница 47: ... inlet dynamic pressure and that the gas valve is correctly calibrated 01 c The electrode detects a direct current of 6 8 µA during the burner ignition phase No Replace the detection electrode and or relative wiring Yes Replace the P C B ERROR 02 Over heating safety thermostat block 02 a The wiring between the safety thermostat and P C B is OK No Restore the electric connection replace the wiring ...

Страница 48: ...flow probe and the P C B connector X2 terminals 4 5 is OK No Restore the electric connection replace the wiring Yes Replace the NTC flow probe If the anomaly persists replace the P C B ERROR 06 Domestic hot water probe anomaly 06 The wiring between the DHW probe and the board connector X2 terminals 6 7 is OK No Restore the electric connection replace the wiring Yes Replace DHW NTC probe If the ano...

Страница 49: ...he P C B ERROR 27 Insufficient circulation 27 The boiler pump functions correctly N B make sure that the pump functions at maximum speed No See section B Yes Any CH system zone valve or cut off cocks are open No Restore circulation in the CH system by acting on the closed devices and also check the correct positioning functioning of the boiler by pass the opening times of any zone valves when nece...

Страница 50: ... starts to run correctly again without having to be reset If the error re occurs 6 times in 8 5 minutes the P C B will display error 43 Loss of continuous flame block Make sure that there are no combustion products inside the aspiration pipes no CO2 make sure the terminals the joints and gasket seals for the flue are all in the correct position so as to avoid the re circulation of combustion produ...

Страница 51: ...otor D At least 20 V DC are present on the gas valve modulation coil cables N B make the measurement by disconnecting the cables from the coil see gas circuit chapter No Check wiring and replace the PC B if necessary Yes The gas valve modulation coil has a resistance of 20 25 Ohm SIT 845 N B make the measurement by disconnecting the cables from the coil see gas circuit chapter No Replace the gas v...

Страница 52: ... min No On the DHW system check the correct opening of any cocks cleanliness of the pipes filters flow rate limiters etc Yes The flow switch functions correctly No Check clean replace the flow switch Yes The wiring between the flow switch and the board is OK No Restore the electric connection replace the wiring Yes Replace the P C B ...

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