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Ariston NEXT SFT 14, User Manual, Page: 12 / 40

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Ariston NEXT SFT 14 User Manual Download Page 12

12

3. installation

3.4. Operating Principle

3.5. Electrical Circuit Diagram

CN1

CN2

CN3

CN4

CN6

CN16

P1 P2 SW2 SW3

CN12

CN13

CN14

CN8

CN9

CN10

CN11

6

5

4

3

2

1

2

1

2

1

4

3

2

1

FUSE 2AT

FLAME

43

21

CN7

1

ON

2 3 4

Display

L N

1

2

3

4

5

6

7

8

9

1

0

11

microswitch

Legend 

1.   

Detection Electrode

3.   Gas valve
4.  Spark generator
5.  Fan
6.   Air pressure switch
7. Overheat 

thermostat

8. Modulator 

Gas 

valve

9. Thermal 

fuse

10. Water fl ow switch
11.   Outgoing water temperature sensor
12.  Inlet water temperature probe

B

C

D

1

2

3

4

5
6

7

8

9

11

12

13

10

Legend 

1.  Heat exchanger
2.  Overheat thermostat
3.    Detection Electrode
4.  Burner
5.   Fan
6.    Outgoing water temperature sensor
7.  Air pressure switch
8. Safety 

valve

9.    Cold water inlet fi lter
10. Water fl ow switch
11.  Inlet water temperature probe
12. Gas valve
13.   Ignition  electrode

Microswitch position

Model

GAS

Microswitch

1

2

3

4

NEXT SFT 14

G20

OFF

ON

OFF

OFF

G31

OFF

ON

OFF

ON

Summary of Contents for NEXT SFT 14

Page 1: ... and Servicing instructions Important This appliance is a domestic gas fired hot water heater and is intended for domestic use only NEXT INSTANTANEOUS MULTIPOINT GAS WATER HEATER TYPE C NEXT SFT 14 Country of destination GB IE ...

Page 2: ...instructions 4 2 1 Control panel 4 2 1 2 Display 4 2 2 Initial set up 2 3 Ignition procedure 5 2 4 Water temperature adjustment 5 2 5 Bath Function 5 2 6 Switchinf off procedure 6 2 7 Appliance shut off conditions 6 2 8 Anti freeze protection 6 2 9 Change gas type 7 2 10 Maintenance 7 ...

Page 3: ...cted piping Explosions fires or intoxication caused by gas leaking from disconnected piping Do not damage the power supply cable Electrocution from live uninsulated wires Do not leave anything on top of the appliance Personal injury caused by an object falling off the appliance as a result of vibrations Damage to the appliance or items underneath it caused by the object falling off as a result of v...

Page 4: ...utton 3 4 Temperature Buttons Used to select hot water delivery temperature 5 Display 1 2 3 4 5 Water temperature indication C Signal error codes Water demand in progress Flame presence signal Fan active The display visualises the set temperature Reset procedure in progress Air pressure switch error see 5 1 ...

Page 5: ...50 C by pressing button 4 again the temperature is increased in steps of 5 C up to a maximum of 65 C WARNING The factory set temperature is 42 C Pay attention when adjusting water temperature higher than 50 C burns may occur during the draw off phase 2 5 Bath Function The Bath function can be used to specify an amount of hot water to be dispensed at a selected temperature While the appliance is in...

Page 6: ...lled where pipes are subjected to freezing it is recommended to empty it Proceed as indicated below Turn the outer electrical switch to the OFF position Close the gas isolation valve Close the cold water inlet isolation valve Open the DHW taps until both the appliance and pipes are completely emptied To fill the appliance again open the cold water inlet isolation valve together with DHW taps until ...

Page 7: ...7 2 user instructions ...

Page 8: ...18 4 Commissioning 19 4 1 Gas supply installation 19 4 2 Checking electricity supply 19 4 3 Lighting the appliance 19 4 4 Setting the gas pressure 19 4 4 1 Supply pressure check 19 4 4 2 Checking the maximum pressure 19 4 4 3 Checking the minimum pressure 20 4 4 4 Completion 20 4 5 Gas settings table 20 4 6 Changing the type of gas 20 5 Appliance shut off conditions 21 5 1 Table summarising error ...

Page 9: ...nd ionisation safety devices they have a modulating burner and are connected to the mains water supply they provide domestic hot water Their self contained combustion chambers with fans for the intake of external air and the extraction of combustion products allow them to operate totally independently from the room in which they are installed 10 ELECTRICAL POWER SUPPLY AND CONTROL Supplies the wat...

Page 10: ...stances If you detect a smell of burning or smoke keep clear of the appliance disconnect it from the electricity supply open all windows and contact the technician Personal injury caused by burns smoke inhalation asphyxiation 3 2 Safety regulations Key to symbols Failure to comply with this warning implies the risk of personal injury in some circumstances even fatal Failure to comply with this war...

Page 11: ...Nominal flow rate ΔT 35ºC l min 10 2 D H W minium flow rate l min 2 Water pressure maximum bar 6 Water pressure minimum bar 0 1 Flue fumes temperature at Maximum nominal heat input C 155 0 Flue fumes temperature at Minimum nominal heat input C 75 4 Ø Flue outlet Air intake 60 100 Dimensions Height Casing mm 563 Width Casing mm 350 Depth Casing mm 130 Power supply voltage frequency V Hz 230 50 Power ...

Page 12: ...h 7 Overheat thermostat 8 Modulator Gas valve 9 Thermal fuse 10 Water flow switch 11 Outgoing water temperature sensor 12 Inlet water temperature probe B C D 1 2 3 4 5 6 7 8 9 11 12 13 10 Legend 1 Heat exchanger 2 Overheat thermostat 3 Detection Electrode 4 Burner 5 Fan 6 Outgoing water temperature sensor 7 Air pressure switch 8 Safety valve 9 Cold water inlet filter 10 Water flow switch 11 Inlet wat...

Page 13: ...inimum clearances In order to allow easy access to the appliance for maintenance operations The appliance must be installed in accordance with the clearances stated below The following elements are supplied with the heater 1x 15mm gas inlet isolation tap complete with washer 1x 15mmx1 2 swivel nut 90 brass connector for the hot water outlet complete with washer 1x 15mm cold water inlet isolating v...

Page 14: ...f Ireland in accordance with the following codes of practice I S 813 Domestic Gas Installations Avoid installing the appliance where the air inlet can be polluted by chemical products such as chlorine swimming pool area or ammonia hair dresser or alkaline products launderette 3 8 1 Flue Detailed information on flue assembly can be found in Section 4 Fitting the Flue The appliance must be installed ...

Page 15: ...trol using main electricity should be situated so that it cannot be touched by a person using the bath or shower in line with current electrical regulations Where the installation of the appliance will be in an unusual location special procedures may be necessary the current edition of BS 5546 should be consulted In the event that the appliance is to be installed in a timber framed building it sho...

Page 16: ...r fully on Bleed any air from the water pipes by opening all the taps hot and cold Then turn off all the taps and check for water tightness Sealing the Gas Circuit IMPORTANT Test for tightness in accordance with current regulations 3 8 11 Connecting the Water Heater to the Electrical Mains The water heater is fitted with an electrical supply cable for a 220 230V 50Hz mains supply It is to be connec...

Page 17: ...t least 5mm must be between the flue duct and structures or walls made of flammable materials When replacing an old appliance the flue must be changed Ensure the flue is not blocked that the exhaust duct joints are fitted correctly and do not leak products of combustion into the air inlet 3 9 1 Fitting the Coaxial Flue Ø 60 100 Horizontal Contents of flue 3318643 2X silicone o ring 60mm 1X elbow 90º 2X ...

Page 18: ... all burrs 9 Insert the flue through the wall and slide the inner decorative collar on the flue pipe 10 Connect the flue to the elbow ensuring that the inner flue engages into the elbow by 23mm NOTE WHEN ENGAGING THE FLUE PIPE ENSURE THE LIP SEALS REMAIN IN POSITION 11 Secure the appliance and the flue pipe to the elbow using the clamps screws and seals 12 When installing the flue ensure it is installed...

Page 19: ...ptor NOTE Pay attention not to dislodge the lip seals in the vertical starter when engaging it onto the appliance and when inserting the vertical flue kit Should extensions be required they are available in 1 metre lengths The vertical starter must always be connected directly to the appliance and the extensions installed between it and the vertical flue kit In the event that an extension piece need...

Page 20: ...ipe onto the test nipple 3 Open the gas isolation valve 4 Activate the appliance by opening a D H W tap 5 Press the SW3 button on the P C B the appliance is forced to maximum power The display will show CH CH and a value from 9 to 9 Default value 0 6 The burner pressure should correspond to the value shown in the Gas Settings table If it does not correspond adjust the potentiometer P2 To save the ...

Page 21: ...nd minimum rate see 4 5 Gas settings table Note Permissible tolerance 5 10 4 4 4 Completion Once installation is complete commission the appliance as instucted in Section 4 page 19 Instruct the end user on the following How to switch off the appliance quickly and indicate the position of the electrical supply isolator Explain to the end user that if the appliance is not to be used for long periods...

Page 22: ...ply Verify the electrical connection to the main unit Problem detected on the electronic card or fuse Replace the card or fuse A 1 A 1 No flame detected Gas isolation valve closed Open the valve and follow the activation procedure Check the ignition electrode Check the detection electrode A 2 A 2 Overheating A temperature higher than 85 C has been detected Check the water pressure A 3 A 3 Air press...

Page 23: ... fan 9 Remove and clean the burner injectors 10 Replace all components turn on the appliance and check correct operation 11 Check the gas inlet pressure and correct working pressures high and low fire as described in Section 4 4 12 Check the gas rate 13 Check the water flow rate 14 Check the combustion CO CO2 as described below 15 Advise the customer of the correct use of the appliance 16 Complete t...

Page 24: ...d positioned Clean injectors and check correct size Burner for damage Heat exchanger clean fins are clean and unblocked No combustion products are recirculating causing vitiation 6 1 1 Replacement of parts The life of individual components vary and they will need servicing or replacing as and when faults develop The fault finding sequence chart in Section 6 4 will help to locate which component is t...

Page 25: ...s A 2 Remove the silicon pipe from the APS B 2 Disconnect the electrical connection from the main pcb C 3 Release the 3 screws and disconnect the APS from the bracket D 1 Release the 2 the two fan fixing screws and remove the silicon pipe A 2 Disconnect the electrical connection from the main pcb B 2 Remove the fan C ...

Page 26: ... Removing the ignitor 1 Disconnect the electrical connections A 2 Release the support bracket screw B 1 Remove the earth connection A 1 Release the 7 screws on the gas collector B 3 Release the screw also dismounts the igniter bracket C 4 Remove the gas collector D ...

Page 27: ... C 6 1 7 Removing the ignition electrode 6 1 8 Removing the detection electrode 1 Release the 2 screws A 2 Remove the ignition electrode and disconnect the male female connector B 1 Release the 2 screws A 2 Remove the electrode and disconnect the electrical connection B ...

Page 28: ...er temperature probe 1 Remove electrical connections A 2 Release the 2 screws and remove the overheat thermostat B 1 Remove the electrical connection A 2 Turn off the cold water isolation valve 3 Drain the appliance 4 Release the 2 screws and remove the hot water temperature probe B C ...

Page 29: ...the cold water isolation valve and drain the appliance 3 Unscrew the 2 screws and remove the hot water temperature probe B 4 Remove the temperature probe C 1 Release the screw and disconnect the electrical connection A B 2 Turn off the cold water isolation valve and drain the appliance 3 Remove the clip from the pipe B 3 Remove the water flow switch C ...

Page 30: ...nance 6 1 4 Removing the main P C B 1 Release the 2 screws and dismount the PCB A 2 Remove all electrical connections from the PCB B 6 1 13 Removing the inlet water filter 1 Release the filter A 2 Remove the filter B ...

Page 31: ... maintenance 6 1 15 Removing the display P C B 1 Unhook the control panel and release the fixing screws A B 3 Release the 4 screws fixing the cover of the main PCB and remove the other connection cables C D E ...

Page 32: ...at exchanger 1 Remove the gas collector as detailed in 6 1 5 2 Release the screw release the silicone pipe from the fan assembly and remove the gas valve A B 3 Disconnect all electrical connections C 1 Remove electrical connections A 2 Remove the gas collector and the ignitor B ...

Page 33: ...er inlet and drain the applianc C D E 4 Remove the fan as detailed in paragraph 6 1 4 5 Release the 4 screws and dismount the heat exchanger burner and combustion hood F 6 Remove the elctrodes and the overheat thermostat 7 Remove the combustion hood from the heat exchanger G H ...

Page 34: ...34 6 maintenance 8 Release the screws to dismount the burner from the heat exchanger I J ...

Page 35: ...ed on 3 The electrical supply is turned on 1 Check replace connection cable 2 Check replace the air pressure switch 3 Check replace the printed circuit board 1 Check replace connection cable 2 Check replace the printed circuit board 1 Check air pressure switch 2 Check venturi pipes 3 Check fan efficiency 1 Check ignition electrode cable 2 Check replace ignition electrode 3 Check replace the P C B ...

Page 36: ...D H W noisy operation Repeated shutdowns check gas pressure check water flow rate check the temperature sensors check heat exchanger check exchanger faulty or lime scale deposits low system water pressure check the gas pressures faulty detection electrodes check gas settings check flame detection electric circuit check the temperature sensor ...

Page 37: ...5158036 211 Water Flow Sensor 65158445 303 Ignitor 65158405 307 Detection Electrode 65158248 308 Ignition Electrode 65158357 401 Gas Valve 6518231 501 Air Pressure Switch 10259000 503 Fan Assembly 65158259 601 PCB Main 65158542 603 PCB Display 65158540 604 Cable Display Panel 65158537 ...

Page 38: ...38 6 maintenance ...

Page 39: ...39 6 maintenance ...

Page 40: ...as not been installed correctly and understand that any manufacturer s guarantee has been withdrawn On the 12 month anniversary of the appliance installation you must have it serviced to continue any guarantee offered into the following year Failure to do so will invalidate your guarantee and should an ARISTON engineer be required to attend and no proof of service documentation is made available t...

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