Ariston NEXT SFT 14, User Manual

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Installation and servicing instructions
(Only for Gas Safe Registered Engineers)
3. Installation ...............................................................9
3.1. Description of the appliance ...........................9
3.2. Safety regulations .........................................10
3.3. Technical specifi cations ................................11
3.4. Operating principle .......................................12
3.5. Electrical circuit diagram .............................12
3.6. Appliance dimensions ...................................13
3.7. Minimum clearances ....................................13
3.8. Reference standards .....................................14
3.8.1. Flue ........................................................14
3.8.2. Installing the water heater ....................15
3.8.3. Siting the appliance ...............................15
3.8.4. Gas supply ..............................................15
3.8.5. Air supply ...............................................15
3.8.6. Electrical supply ....................................15
3.8.7. Removing the outer casing ....................15
3.8.8. Wall mounting ........................................16
3.8.9. Connecting the heater to the water
and gas supply .......................................16
3.8.10. Sealing the water and gas circuits ........16
3.8.11. Connecting the water heater to
the electrical mains ...............................16
3.8.12. Purging the gas supply ..........................16
3.8.13. Completion after commissioning ..........16
3.9. Fitting the fl ue ...............................................17
3.9.1. Fitting the coaxial fl ue
(Ø 60/100 Horizontal) .............................18
3.9.2. Flue extensions......................................18
3.9.3. Table of fl ue gas exhaust duct lengths ..18
3.9.4. Fitting the Coaxial Flue
(Ø 60/100 Vertical) .................................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 codes....................21
6. Maintenances .........................................................22
6.1. Servicing instructions ...................................22
6.1.1 Replacement of parts ............................22
6.1.2 To gain general access ..........................22
6.1.3 Removing the air pressure switch .........23
6.1.4 Removing the fan ...................................23
6.1.5 Removing the gas collector ...................24
6.1.6 Removing the ignitor .............................24
6.1.7 Removing the ignition electrode ...........25
6.1.8 Removing the detection electrode ........25
6.1.9 Removing the overheat thermostat ......26
6.1.10 Removing the hot water temp. probe ....26
6.1.11 Removing the inlet water temp. probe ..27
6.1.12 Removing the water fl ow switch ...........27
6.1.13 Removing the inleft water fi lter ............28
6.1.14 Removing the main PCB ........................28
6.1.15 Removing the display PCB ....................29
6.1.16 Removing the gas valve .........................30
6.1.17 Removing the heat exchanger ...............30
6.2. Fault fi nding chart .........................................22
6.3. Short spares list ............................................22
7. Terms and conditions of guarantee ..........................