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Ariston EuroCombi A27 MFFI GC 47 116 10

1. 4 X3 sva SoL dwnr O00LNO 2 1046 e v 2 8 4 v je 2 up S 16 B023 2 12 Water Circuit Diagram 23 A 27 3 3 1 8023 Air Pressure Switch Fan Main Heat Exchanger Main Burner Ignition Electrodes Ur ds ey s A 0000006 3000600 p Detection Electrode Gas Valve Overheat Thermostat Main Circuit Temperature Probe Diverter Valve 5 1 2 0 Main Circuit Flow Switch including dno i Safety Pressure Switch for 4 18 11 Automatic By pass wie 7 12 Microswitch for Diverter Valve 12 lt A B C COMMISSIONING Initial Preparation Lj 13 Secondary Heat Exchanger 7 14 Domestic Water Inlet Filter 15 Boiler Drain Valve 14 15 16 Safety Valve 17 Water Pressure Gauge 18 Circulation Pump wit
2. Main Circuit Temperature Probe Diverter Valve ee lt 1 E 3 6666660 5666660 19 4 22 in 5 2 6 T U 3 18 8 7 9 z 2 11 12 7A B C X X X B 13 15 Legend 1 Air Pressure Switch 2 Fan 3 Main Heat Exchanger 4 Main Burner 5 Ignition Electrodes Detection Electrode 6 Gas Valve 7 Overheat Thermostat 8 9 1 0 Circuit Flow Switch including Safety Pressure Switch for Primary Circuit 11 Automatic By pass 12 Microswitch for Diverter Valve 13 Secondary Heat Exchanger 14 Domestic Water Inlet Filter 15 Boiler Drain Valve 16 Safety Valve 17 Water Pressure Gauge 18 Circulation Pump with Automatic Air Release Valve 19 Expansion Vessel 3 3 1 COMMISSIONING Initial Preparation MTS GB Limited support the initiative Within the information pack you will find a copy of the logbook It is important that this is complet ed in the presence of your customer they are shown how to us it and it is signed by them Please instruct your customer that they must have their Gemchmarg logbook with them whenever they contact a service engineer or us Preliminary electrical system checks to ensure electrical safety must be carried out by a competent person i e polarity earth continuity resistance to earth and short circuit Filling the Heating Sy
3. uaa Cri mJ E 2 5 ini m Les Gaiety valve 3 bar 1 2 Pressure m _ 164220 boft Li Le Lo m Lo e EXCMUEEL ____________________ Ei A MEFI ri nm tm gt T Le l 7 y PaE d 1 7 J le 7 m a Pg e C p J s c deo lt gt na E pie Laid ia o iF n qi Sf Ino 54 gt obs 514 4 2 Cn I Lr D o mJ i 4 7 e 15 E im E C c 1 i Lo e a Les 1 2 1 i E ij Eo 100 aw 50 ____574272 ssen 573421 550392 ___57227 ____5722717 CC Go Gasket UA re mah Peet d fi nap D Cina c s L m qi rt d 28 029 27 e 7874 72 Tt 69 70 69 68 67 66 65 64 63
4. Removing the fan 27 1 Disconnect electrical connections and remove screws S using a No 2 star tipped screwdriver see fig 1 27 2 Pull fan to the right forward and remove see fig 1 28 3 Remove fan from mounting plate 4 Remove screws T see fig 1 29 8029 1 4 8029 Servicing and Removal of the Gas Valve Setting gas pressures Setting the minimum and the maximum power of the boiler 1 Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas 2 To do this remove the screw A Fit the pipe of the pressure gauge to the pressure connection of the gas valve When you have completed this operation replace the screw A securely into its housing to seal off the gas 3 To check the pressure supplied by the gas valve to the burner remove the screw Fit the pipe of the pressure gauge to the pressure outlet of the gas D Disconnect the compensation pipe either from the gas valve or from the sealed chamber 4 Set the On Off button to position 1 and the summer winter switch to the winter position To set the maximum power turn on the hot water tap and allow the hot water tap to run at a rate of about 8 litres minute so that the main burner lights Adjust nut E on the modureg to set the gas pressure displayed on the pressure gauge corresponding to the
5. reverse of the boiler control panel see section 2 10 to 9 10 on room stat terminal block on the the junction box from the the P C B then connect 9 gt O 91516 44 2 5195 33IN 06 42 52 51192 IHAN 13 2 BOILER ELECTRICAL SUPPLY CABLE BH TYPICAL JUNCTION BOX lt 5 55 e C u as dJNWNWvVHSOHd 0906 d 0206 NO NO MH 0002 LL 9 p Yur 0 dIN Yul enn EET efi ta fete rete 9 6 0 13 oun 006 908 H31SVINHO LIMS n o pe Lows ejeuog AuoydwAs 1 6 1 001 06 dS 0 3 8 2 9 0 3 1 1 V4043H HEATING VALVE V4043H HOT WATER VALVE 9 6 w104 01 9 owebues 9 9 1 202 LOZ 9 9 6 XU 3 201 201 1006 1000444 571041 0006 000 10149104 1060010 028 9 10081 1 9 SIDE 8 0 1 ur 105 506 Sep UUEUJ SJOH lt i 922 1 5 5 Igo ISS N eee 24 023
6. 149 9 5 1 9 0 1 108 909 Sep 5 0029 15 0069 15 0079 15 TET 200 9669 15 lt m lt gt s OD le o 152 N lt 23 7 TECHNICAL INFORMATION CE Certification Heat Input max min kW 25 6 11 0 Heat Output max min kW 23 1 9 2 Efficiency of Nominal Heat Input 90 2 Efficiency at 30 of Nominal Heat Input 87 8 Heat Loss to the Casing AT 50 C 1 2 Flue Heat Loss with Burner Operating 8 6 Flue Heat Loss with Burner 0 4 Maximum Discharge of Fumes 620 625 59 Residual Discharge Head 1 15 Consumption at Nominal Capacity G20 G25 2 72 3 32 Gas Consumption after 10 Minutes 0 32 0 39 15 C 1013 mbar G30 G31 2 02 2 00 Temp of exhaust fumes at nominal capacity G20 G25 137 Content 5 8 Content 10 CO Content 32 7 Minimum Ambient Temperature 5 Head Loss on Water Side max AT 20 C 200 Residual Head of System 0 25 Heating Temperature max min C 82 42 Domestic Hot Water Temperature max min C 56 36 D H W Flow Rate AT 35 C l min 9 5 D H W Flow Rate AT 35 C gal min D H W Minimum Flow Rate l min Pressure of Domestic Hot Water max min bar Expansion Vessel Capacity Expansion Vessel Pre load Pressure bar Maximum Water Content in System 145 Maximum Heating Pressure bar Nominal Pressure Natural Gas G20 G25 mbar 20 25 LPG G30 G31 mbar 30
7. RE r Bis Hmm k a w EI bx Nue 66 mi Te c 3 i 75 i do a B CC Eme 123 H 3 5 F Padre du 16 19 20 21 22 23 24 25 26 28 30 31 32 33 34 38 35 37 36 38 Stampa BIEFFE 518 tear Ae a i be he ME 121 vant p mm 7 amp t pen Bh ou T bid cu wn ts eu m E 513 DES hi E mma an E E n MODELS CHARACTERISTICS SERIAL Nt REF X VALIDITY A 23 UK 2320019700001 z A 23 LPG 232001 37000601 823 99 84 1268 211 8029 029 27 EDI 044 164225 1E 1840 n ieil P 5 ___2 E GEI 257207 953770 557 Ln i 552575 ___50 572990 ss ese 573342 ee aust mani cld haads ______ __573314 ___ 88 jFasteninn s a sl LL 8S Automat 2388 valve 584254 230 58938 cea m 1151 I i n ii mia
8. 13 571965 1i4 379981 _ Detectionelectrode O Z AX 57341 118 164261 Gasket 14 1 1 1 9569390 CI 120 379979 Ignition electrode RH 569560 121 379980 lgniionelectrode LH 1 1 1 1 1 95695601 122A 02026 __ o Z 572271 122B Mainbunmer Z 1 1 572277 122C 02078 jMainbumer o Z 1 572323 122D X jMainbumer 57237 123 ________ 1 1 572749 12300 Mainexchangr 572835 989131 J DHMW actutorkt 8 1 57144 321 378978 SITTandemgas valveoperatorcois 570712 SIT Tandem modureg coil Gas modulator cartridge SIT Tandem moduregcol Gas modulator cartridge 361 85714438 D H W pressure switch kit _ _ 57142 __ ___363 jS9 wayspingkt 87144 364 j D HW dipramvave 57146 3731 diaphram 57547 372 Mainflow switch magnet 5172 373 flow switch spring BTA 374 jMainflowswichtopcap 5770 375 Mainflowswithreedsystem 5731380 381 164311 Bumerjeti25fulkit Natualgas 1 569280 382 Burner jet 0 72 fullkit
9. 0 100 20 30 1340 509 60 70 800 9 100 10 1200 1300 1400 System The provision for satisfactory flue termination must be made as described in BS 5440 1 The appliance must be installed so that the flue terminal is exposed to outdoor air The terminal must not discharge into another room or space such as an outhouse or lean io is Important that the position of the terminal allows a free passage of air across it at all times The terminal should be located with due regard for the damage or discolouration that might occur on buildings in the vicinity In cold or humid weather water vapour may condense on leaving the flue terminal The effect of such steaming must be considered If the terminal is less than 2 metres above a balcony above ground or above a flat roof to which people have access then a suitable terminal guard must be fitted When ordering a terminal guard quote the appliance model number A suitable terminal guard is available from TOWER FLUE COMPONENTS Morley Road Tonbridge Kent 9 1RA The minimum acceptable spacing from the terminal to obstructions and ventilation openings are specified in Fig 2 5 023 TERMINAL POSITION mm A Directly below an open window or other opening 300 B Below gutters solid pipes or drain pipes 75 C Below eaves 200 D Below balconies or car port roof 200 E From vertical drain pipes and soil pipes 75 F From internal or external cor
10. L Length of Piping In calculating the lengths of the pipes the maximum length must also take into consideration the values for the exhaust air intake end terminals as well as 90 elbows for coaxial systems The C52 types must comply with the following requirements 1 The discharge intake vent pipes must have the same diameter of 80 mm 2 If an elbow is inserted into the discharge ventilation system the calculation of the overall extension must take into consideration the values for each curve as indicated in the table 3 The exhaust pipe must extend at least 0 5 m above the ridge of the roof if it is located on a side other than that for the air intake this is not obligatory if the exhaust and air intake pipes are located on the same side of the build ing 2 10 Room Thermostat Connection In order to perform this procedure remove boiler cover as indicated in section 3 2 Then proceed as follows 1 Remove the screws A located on the bottom part of the boiler 2 Widen the sides so that the control panel can be rotated 3 Open the cover on the left hand side of the compartment 4 Insert the wire for the connection of the room thermostat into the wire holder as indicated in photo 3 5 Remove the grommet D shown in photo 5 make a hole in it and pass the room thermostat wire through 6 Remove the link located on the terminal and connect the wire 7 Replace the grommet and the term
11. ompi A 23 A 27 47 116 10 47 116 12 Installation Instructions Type C Boilers LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER TABLE OF CONTENTS 2 9 GENERAL INFORMATION General Instructions Technical Information Overall View INSTALLATION Reference Standards Siting the Appliance Overall Dimensions Clearances Mounting the Appliance Electrical Connection Gas Connection Water Connections Flue Connection 2 10 Room Thermostat Connection 2 11 Electrical System Diagrams 2 12 Water Circuit Diagrams 6 1 6 2 COMMISSIONING Initial Preparation Removing the Front Panel Control Panel Initial Start up Operational Adjustments Combustion Analysis Fume Discharge Monitoring Boiler Safety Systems Draining the System GAS ADJUSTMENTS Gas Adjustment Table Changing the Type of Gas MAINTENANCE MISCELLANEOUS Wiring Diagram for Two Heating Zones Wiring Diagram for Connection to Ariston Unvented Cylinder 023 1 1 1 023 GENERAL INFORMATION General Instructions This manual is an integral and essential part of the product It should be kept with the appliance so that it can be consulted by the user and our authorised personnel Please carefully read the instructions and notices about the unit contained in this manual as they provide important information regarding the safe installation use and maintenance of the product For operating instru
12. sva sol 00 eiue 2 Lun p S 9 UJ UJ o UJ N B029 4 SHORT SPARE PARTS LIST 23 A 27 SIT Sigma Gas Valve 17 18 19 20 2 m o 096 1 2 2 23242 82 2 72 7164 70 69 666768 67 66 65 64 636261 60 59 58 106 57 118 lt 1 x 107 4 114 3 a 111 108 109 110 HS sol EXER d X T x C Nr Wide pen NAR lt i G ARISTON A 23 27 MFFI 28 B029 23 A 27 SIT Sigma Gas Valve 1 Expansion vessel o J 573284 11 16425 3 1 1 573520 14 jOvemeatthermsat 1 99720 17 JMaifowSwich o 0 0 57324 O 18 164338 _ probe CHW J 4 9569286 19 Microswitch for 3 way main flow group 573340 23 164229 Gasket 1 7 o 1 1 1 1 1 573528
13. THE Pot ER CI SETTES FoR THES PERS THS 5 HW I3 HOT WATER BEING BEING BALERS Yr 2 4 THE 2 TLE CLDR SYSTEH THE SAFETY BEE TER AID ILE SERED To TT TE THERE ST TEED THE LEYE Ta Tzarecr a5 X7 20 029 ES THE 09 PUMP OOM EON THE THE ra T ER KAT COME roses ilpamp i stick 21 bon pump 8029 21 5 THE FEAT CXOME OPNS SHJTDCAAME SAFETY DEYE IFITER SAFETY AZB ACT ATE DF IS THERE POWER THE I Check prasau winn MED i 22 8029 1 Check Aue discharge Checkvertun amp small pipes ckwire brair pess switeh Check reglo airpress switch AIR PRES SURE ACT ATE ignition eck yy INN ARE THE 3 Check spark FUMES 4 arrcall wire Tet ORRE Tr WEE BEY 1 Check supat of gas to gas eas upay Checkeontral Check ot the gas va
14. mra zT 7 J65 ggi Lue 16 02 her 444 jme Ch E 5742 z 62561 562560 27344 25 30 pom d cra I no ho 8029 W 8029 31 Manufacturer Commercial subsidiary Merloni TermoSanitari SpA Italy MTS GB LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone 01494 755600 Fax 01494 459775 internet http www mtsgb Itd uk E mail info mtsgb Itd uk Technical Service Hot Line 01494 539579 Stampa Bieffe Recanati 23 99 84 1268 311 3 ARISTON Users Manual A 23 27 EZ TABLE OF CONTENTS pA 1 GENERAL INFORMATION page 5 2 OPERATING INSTRUCTIONS page 8 3 TIME CLOCK page 11 4 USEFUL INFORMATION AND TROUBLESHOOTING page 13 IMPORTANT Please read this manual carefully For additional information please consult the Installation and Servicing Instructions Please ensure manuals provided are kept with the appliance so that they can be used by the end user installer or our authorised engineer 8022 MTS GB Limited support the Geachmark gt initiative Your installer will give you and show you how to use a logbook which will give you important information about your boiler and heating system Please have this log book to hand whenever you contact a service engineer or us CORGI Registered Installers carry a CORGI ID card a
15. which allows to switch between winter lt II gt and s jm eu summer lt gt operating modes and vice versa i When the knob is set to lt gt the boiler ARS serve the dual purpose of providing heat and or hot water for domestic use The supply of hot water for domestic use always takes precedence over heating When the knob is set to lt 2 gt the boiler cuts out the heating system and only provides water for domestic use when needed 8022 TURNING ON THE BOILER Installation without a room thermostat D Q Turn on the power supply to the boiler by pressing the D On Off switch L the green L E D I will the turn on the selector knob to lt IIl gt Regulate the temperature of the water in the boiler by turning the knob The temperature can vary between 42 C and about 82 C Check the boiler temperature on the thermometer with the yellow L E D s With this type of installation the ambient temperature does not influence the operation of the boiler and the circulation pump always re mains in operation 8022 Installation with a room thermostat Turn the selector knob to lt Ill gt Turn on the power supply to the boiler by pressing the On Off switch L the green L E D will then turn on Turn the thermostat knob to the highest tempera ture setting With this type of installation
16. 1 Remove the electrical connector by pulling off the thermostat connections and unscrewing the sensor probe with a 14 mm open ended spanner see fig 1 49 17 1 6 18 Access to Control System F EU d E E Fij b Checking fuse 1 Remove the inspection panel see fig 1 6 1 7 2 Remove fuse see fig 1 50 n i a i Removing the time clock 1 Remove the inspection panel see fig 1 6 1 7 2 Remove electrical connection of the clock 5 see fig 1 51 3 Unclip the clock from the panel and remove see fig 1 52 B029 B029 N B is possible to by pass the time clock in the event of failure by simply unplugging the electrical connection from the P C B see fig 1 48 This will revert control of the central heating to the room stat connection on the reverse of the control panel Removing the P C B s 1 Isolate electricity 2 Remove the front cover of the boiler 3 Remove the inspection panel see fig 1 6 1 7 5 Remove the mounting screws see fig 1 53 6 Disconnect the connection cable A7 see fig 1 54 7 remove the 24V P C B remove the electrical plug connectors and screws see fig 1 55 8 To remove the 240V P C B remove the electrical plug connectors and s
17. 11 Transformer 12 Filter BO1 Over Heat Thermostat BO2 Room Thermostat Gas Valve Modulator B05 Heating Sensor BO6 Pressure Switch for Heating Circuit 807 Microswitch for Diverter Valve Colours Gry Grey Rd Red Blue Grn YII Yellow Green Wh White Brn Brown Blk Black Wh Rd White Red 23 A 27 600000 40 50 60 70 80 CN 100 a 101 BE 9 Fuse 2A Fuse 2 IN 230
18. 15 jets Consumption 15 C 1013mbar Consumption 15 C 1013mbar Gas Cock Outlet Pressure max min 023 off status After the system has been allowed to cool the system be reset by pressing the button A 4 Limescale Build up This is an indirect control actuated through the regulation of the temperature in the primary heat exchanger on the formation of limescale in the secondary heat exchanger Regardless of the flow rate and the temperature in the circuit for the domestic hot water the temperature is limited to 62 C 5 Safety Shut off At the start of every lighting phase the P C B performs a series of internal controls If a malfunction occurs the boiler will shutdown until the problem has been resolved Draining the heating system The heating system must be emptied as follows Turn off the boiler Open the drain valve for the system and place a container below to catch the water that comes out Empty the system at the lowest points where present If you plan on not using the heating system for an extended period of time it is recommended that you add antifreeze with an ethylene glycol base to the water in the heating lines and radiators if the ambient temperature drops below 0 C during the winter This makes repeated draining of the entire system unnecessary Draining the domestic hot water system Whenever there is the danger of the temperature dropping below the freezing poi
19. 2 Remove electrical connection of the clock B1 see fig 1 53 3 Unclip the clock from the panel and remove see fig 1 54 8029 8029 It is possible to by pass the time clock in event of failure by simply unplug ging the electrical connection from the P C B see fig 1 48 This will revert control of the central heating to the room stat connection on the reverse of the control panel Removing the P C B s Isolate electricity Remove the front cover of the boiler Remove the inspection panel see fig 1 6 1 7 Remove the mounting screws B2 see fig 1 55 Disconnect the connection cable B3 see fig 1 56 To remove the 24V P C B remove the electrical plug connectors and screws B4 see fig 1 57 remove the 240V remove the electrical plug connectors and screws B5 see fig 1 58 9 Replace either P C B in reverse order a fie a a F a a 19 2 FAULT FINDING 2 1 Fault Finding Guide It is possible to detect and correct any defect by using the standard fault fin Flow chart ding diagrams described in this chapter Pralircinar z ke sures har li Tham is ber in thes 3Tha sis umad 3l Thaalactricite tha be ilar iz on On Buren THE IKSHT
20. 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 GENERAL INFORMATION General Instructions Overall View INSTALLATION Reference Standards Siting the Appliance Overall Dimensions Clearances Mounting the Appliance Electrical Connection Gas Connection Water Connections Flue Connection 2 10 Room Thermostat Connection 2 11 Electrical System Diagrams 2 12 Water Circuit Diagrams 6 1 6 2 COMMISSIONING Initial Preparation Removing the Front Panel Control Panel Initial Start up Operational Adjustments Combustion Analysis Fume Discharge Monitoring Boiler Safety Systems Draining the System GAS ADJUSTMENTS Gas Adjustment Table Changing the Type of Gas MAINTENANCE MISCELLANEOUS Wiring Diagram for Two Heating Zones Wiring Diagram for Connection to Ariston Unvented Cylinder TECHNICAL INFORMATION 1 11 GENERAL INFORMATION General Instructions This manual is an integral and essential part of the product It should be kept with the appliance so that it can be consulted by the user and our authorised personnel Please carefully read the instructions and notices about the unit contained in this manu al as they provide important information regarding the safe installation use and mainte nance of the product For operating instructions please consult the separate User s Manual Users Manual A 23 MFFI 27 A ARISTON
21. 24 378814 _ o Z 1 1 573727 25 JjjSafeyvave3bari 7 o o 1 1 1 1 578172 ___ 28 g Presuegaug 571649 32 J jTmecok o JQ JL 99708 45 953730 46 JPR GB EIA MFI 952981 47 jPR GB cabDe o 9526000 57AB jFan 1 1 5729888 Y 5700 Fan 1221 5990 58 BFaninetgasket o 1 1 1 573343 61 Venturi exhaust manifold neader 5733814 72AB 03818 Air pressure switch Z 1 1 1 1 1 571651 72CD _E02071__ Airpressureswitth 1 1 9571662 75 jFasteningsping A 570717 ___ 84 379079 _ air release vave 1 5642254 85 3164230 _ 1 1 1 569887 ___ 87 JJ JjOung J A4 J 571449 __ 89AB sd Secondary exchanger plate type exchanger 23kW 571646 89CD _______ Secondary exchanger exchanger 27kW 573295 __90 Oving secondary exchanger 1 1 57325 922 e018O ng J 2 571807 573521 98BAB 997150 98CD Pump 997151 100 2 571965 101 Gasket _ 0 5 5 0 574279 M SS 379981 1
22. A 23 MFFI Removing the sealed chamber frontal cover Removing the combustion cover Remove the screws 5 EE 3 j A 27 Removing sealed chamber Removing the combustion cover frontal cover at reg AR Remove the screws D B029 Removing burner and dis 1 Remove the side panels of sealed chamber fig 1 10 injectors 2 Remove the screws of the burner see fig 1 11 3 Remove the burner see fig 1 12 4 Remove the injectors using a No 7 socket spanner 5 Replace in reverse order A 23 MFFI A 27 MFFI id BA 8029 Removing electrodes 1 Remove rubber gasket I see fig 1 13 8029 2 Disconnect ignition leads by pulling downward see fig 1 14 3 To remove the flame sensor disconnect the cable at its only connection point close to the see fig 1 15 5 Remove screw J using a Philips No 2 star tip screwdriver see fig 1 16 6 Slide the electrode gently downward see fig 1 17 m To replace repeat the steps in reverse order paying particular attention to the following a Centre th
23. benchmark Read the instructions and recommendations in these Installation Instructions carefully to ensure proper installation use and maintenance of the appliance Keep this manual in a safe place You may need it for your own reference while our Servicing Centre technicians or your installer may need to consult it in the future This is a combined appliance for the production of central heating C H and domestic hot water D H W This appliance must be used only for the purpose for which it is designed The manufacturer declines all liability for damage caused by improper or negligent use No asbestos or other hazardous materials have been used in the fabrication of this prod uct Before connecting the appliance check that the information shown on the data plate and the table on pages 4 5 comply with the electric water and gas mains of the property You will find the data plate on the reverse of the control panel The gas with which this appliance operates is also shown on the label at the bottom of the boiler Do not install this appliance in a damp environment or close to equipment which spray water or other liquids Do not place objects on the appliance Do not allow children or inexperienced persons to use the appliance without supervi sion If you smell gas in the room do not turn on light switches use the telephone or any other object which might cause sparks Open doors and windows immediately to
24. 23 model 27 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2223 24 252627 kW 8 9 10 11 OPERATING POWER 12 13 14 1 516 17 18 1 20 21 22 23 kCal h 1000 GAS NOZZLE PRESSURE Model 23 model 27 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2627 kw 5 6 7 8 9 1 O 11 12 13 14 1 516 17 18 1 20 21 22 2 kCal h x 1000 GAS NOZZLE PRESSURE 23 model 27 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2627 kw 8 9 10 1 OPERATING POWER 12 13 14 1 51617 18 1 9 20 21 22 23 kCal h x 1000 5 5 NATURAL GAS G20 BUTANE GAS G30 PROPANE GAS G31 Gas rate 3 0 m3 h 106 0 ft S h 0 88 3 31 1 ft9 h 1 15 m3 h 40 6 f h Gas rate 1 2 m3 h 42 3 ft3 h 0 35 m3 h 12 3 ft9 h 0 46 m3 h 16 2 ft8 h Inlet pressure 20 mbar 7 8 in w g 28 mbar 10 9 in w g 37 mbar
25. switch to winter position Turn the knob of the heating thermostat clockwise to maximum 8 Remove the left hand inspection panel of the and fit a small cross head screwdriver in to the right hand potentiometer Turn clockwise to increase the pressure or counter clockwise to reduce the pressure Adjust the setting to the required heating pressure value displayed on the pressure gauge as indicated in the diagrams shown in page 11 9 Turn off the boiler by placing the main switch to the Off position Setting pressure for soft ignition Disconnect the detection electrode connection from the P C B see fig 1 13 Start the boiler and during the ignition sequence adjust the centre potentiometer until the gas pressure reads the required gas pressure as per the table below Once the gas pressure is set turn off the boiler and reconnect the connection to the NB It may be necessary to reset the flame failure reset a number of times during this operation NATURAL GAS G20 BUTANE GAS G30 PROPANE GAS G31 Recommended pressure for slow ignition 5 mbar 1 95 in w g 18 mbar 7 0 in w g 19 mbar 7 4 in w g B029 Regulating the heating power Regulating the heating power for Regulating the heating power for natural gas G20 butane gas G30 propane gas G31 TABLE A B029 GAS NOZZLE PRESSURE N fF A O node
26. 14 4 in w g Burner pressure 12 3 mbar 4 8 in w g 28 mbar 10 9 in w g 37 mbar 14 4 in w g Burner pressure 2 0 mbar 0 8 in w g 5 1 mbar 2 0 in w g 7 0 mbar 2 7 in w g Burner injectors 13 x 1 25 13 x 0 72 13 x 0 72 11 G ARISTON 12 Anti cycling Device Soft light Adjustment Max Heating Adjustment 10 Remove the pipe from the pressure gauge and connect screw to the pressure outlet in order to seal off the gas 11 Carefully check the pressure outlets for gas leaks valve inlet and outlet IMPORTANT Whenever you disassemble and reassemble the gas connections always check for leaks using a soap and water solution Setting the anti cycling device This appliance is equipped with a potentiometer which delays the ignition of the heating control and is situated on the P C B see the electrical diagrams By adjusting the potentiometer it is possible to change the time interval between the burner shutting down and its next ignition is preset at 1 minute and can be adjusted from 0 to 2 minutes Use this control in particular situations where continuous shutting down and ignition of the main burner occurs Removing the spark generator SIT Sigma gas valve 1 Disconnect ignition leads Q by pulling upwards see fig 1 27 2 Remove the screws R see fig 1 28 with a Poz
27. 15 C 1013mbar Nominal Delivery Pressure Minimum Delivery Pressure A 23 Main Burner n 13 jets 0 Consumption 15 C 1013mbar Consumption 15 1013mbar Gas Cock Outlet Pressure min max A 27 MFFI Main Burner n 15 jets Consumption 15 C 1013mbar Consumption 15 1013mbar Gas Cock Outlet Pressure max min 1mbar 10 197 column of water The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid The maximum pressure of the gas to the burner will be equal to the nomi nal delivery pressure minus the head loss within the gas valve 4 1 Changing the Type The boiler can be converted to use either methane natural gas G20 or LPG of Gas G30 G31 by an Authorised Service Centre The operations that must be performed are the following 1 Replace the jets on the main burner see table in section 4 2 Adjust the maximum and minimum thermal capacity values for the boiler see table in section 4 3 Replace the gas rating plate 4 Adjust the maximum thermal power setting 5 Adjust the soft light feature 6 Adjust the ignition delay feature for the heating system can be set from O to 2 mins CATEGORY 12 3 Methane Gas Liquid Butane Gas Liquid Propane Gas G30 G31 Recommended Soft Light Pressure mbar It is recommended that the following checks be made on the boiler least once a year 1 Check the seals
28. 2 Remove the valve Removing the automatic air vent 1 Unscrew valve W see fig 1 39 Removing the main circuit flow switch 1 Remove the cable of the main circuit flow switch Y 2 Remove the screws Y1 see fig 1 40 3 Remove the main circuit flow switch 029 15 16 77 MAI Lo i NO v Emm Removing the pump 1 Unscrew Z and remove the electrical connection see fig 1 41 2 Release the nuts A1 and remove the pump see fig 1 42 Removing the pressure gauge 1 Remove the inspection panel see fig 1 6 1 7 2 Release coupling A2 using a 14 mm open ended spanner see fig 1 43 3 Push the pressure gauge through the control panel from the rear see fig 1 44 8029 Removing the expansion vessel 7 Remove nut A3 away from the expansion vessel see fig 1 45 2 Remove nut A4 see fig 1 46 3 Remove expansion vessel see fig 1 47 B029 Removing the overheat thermostat 1 Remove the electrical connection from the overheat thermostat see fig 1 48 2 Then remove the thermostat from the pipe by releasing its securing clip v A Removing the heating temperature sensor N T C
29. 2 minutes factory set at 1 minute the potentiometer for regulating the soft light feature the setting for which can range from the minimum thermal power to the maximum B023 19 3 6 Combustion Analysis 3 7 Fume Discharge 3 8 20 Monitoring Boiler Safety Systems 1 8 mm the potentiometer for the maximum thermal power for the heating system maximum thermal power seiting factory set at the maximum value unless indicated otherwise on the adhesive sticker located in proximity to the potentiometer The connection for the diagnostic device TCS TCS2 The boiler is designed to make it easy to analyse the combustion by products Using the especially designed apertures readings can be taken on the temperature of the combustion by products and of the combustion air as well as of the concentrations of Oz and etc The best maximum power test conditions for the heating system are when the selector is turned to the flue analysis setting The discharge ventilation of the exhaust fumes can be monitored to check for losses general pressure in the system This is done to eliminate the cause of lighting failure with the main burner not indicated by a shutdown status With a differential manometer connected to the test socket on the combustion chamber the DP value for the air pressure switch can be taken The measured value should not be less than 10 mbar under maximum thermal power cond
30. 3 20 200 Residual Head of System 0 25 Heating Temperature max min C 82 42 Domestic Hot Water Temperature max min C 56 36 D H W Flow Rate 3 359 l min 11 2 D H W Flow Rate T235 C gal min 2 5 D H W Minimum Flow Rate l min 2 6 Pressure of Domestic Hot Water max min bar 6 0 2 Expansion Vessel Capacity 7 Expansion Vessel Pre load Pressure bar 1 Maximum Water Content in System 145 Maximum Heating Pressure bar 3 Nominal Pressure Natural Gas G20 G25 mbar 20 25 20 25 LPG G30 G31 mbar 30 37 30 37 Electrical Supply V Hz 230 50 230 50 Power Consumption W 150 190 Protection Grade of Electrical System IP 44 44 Internal Fuse Rating FAST 2 AT FAST 2 AT Weight Kg 47 47 G C Number 47 116 10 47 116 12 Calculated at 7096 maximum output 4 023 1 3 Overall View A 23 MFFI A 27 MFFI gt E 5254 DOO Ord DOr NO 10 I 2167 A 20 i v a 23 21 Y 20 19 18 17 16 15 14 Fig 1 1 Legend Xl o es Flue Connector Combustion Chamber Hood Main Heat Exchanger Combustion Chamber Insulation Panel Burner Expansion Vessel Overheat Thermostat Spark Generator Diverter Valve Main Circuit Temperature Probe Main Circuit Flow Switch Diverter Valve Microswitch Fil
31. 37 Electrical Supply 230 50 Power Consumption 150 Protection Grade of Electrical System 44 Internal Fuse Rating FAST 2 AT Weight 47 Number 47 116 18 47 116 19 Calculated 70 maximum output 29 8 12 0 27 3 10 1 91 6 88 3 1 3 7 1 0 4 62 1 4 3 16 3 86 0 37 0 45 2 35 2 32 128 6 6 8 6 32 5 20 25 30 37 230 50 190 44 FAST 2 AT 47 Manufacturer Merloni TermoSanitari SpA Italy Commercial subsidiary MTS GB LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone 01494 755600 Fax 01494 459775 Technical Service Hotline 01494 539579 24 STAMPA Azienda Grafica BIEFFE srl Recanati Cod 23 99 84 1260 311 B023 ERU CORTO Gi ARISTON A 23 MFFI A 27 MFFI G C N 47 116 18 47 116 19 Servicing Instructions benchmark Type C Boilers LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER TABLE OF CONTENTS 1 SERVICING INSTRUCTIONS 1 1 Replacement of Parts 1 2 To Gain General Access Removing the Front Panel Removing the Side Panels To Lower the Control Panel 1 3 Access to the Combustion Chamber Removing the Sealed Combustion Chamber Removing the Burner and Injectors Removing the Electrodes Removing the Main Heat Exchanger Removing the Air Pressure Switch Removing the Venturi Device Removing the Fan 1 4 Servicing and Removal of the Gas Valve Setting Gas Pressure Removing the Spark Ignitor Remo
32. 5 25 023 5 023 26 27 B023 Manufacturer Commercial subsidiary Merloni TermoSanitari SpA Italy MTS GB LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone 01494 755600 Fax 01494 459775 Technical Service Hotline 01494 539579 STAMPA Azienda Grafica BIEFFE srl Recanati Cod 23 99 84 1260 112 B023 Euro 9 hs ry LODS un 5 4 gt LCD BAN gt E IAE d A Iu 74 23 27 47 116 10 47 116 12 Servicing Instructions Type C Boilers LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER TABLE OF CONTENTS 1 SERVICING INSTRUCTIONS 1 1 Replacement of Parts 1 2 To Gain General Access Removing the Front Panel Removing the Side Panels To Lower the Control Panel 1 3 Access to the Combustion Chamber Removing the Sealed Combustion Chamber Removing the Burner and Injectors Removing the Electrodes Removing the Main Heat Exchanger Removing the Air Pressure Switch Removing the Venturi Device Removing the Fan 1 4 Servicing and Removal of the Gas Valve Setting Gas Pressure Removing the Spark Ignitor Removing the Gas Valve 1 5 Access to the
33. C H W 569296 19 Microswitch for 3 way main flow group 12 57330 amp 28 MEN a 164 229 Gasket 1 2 573528 378 814 Manual vent cock 573727 Safeyvalve8bart1 2 ______ 28 jPresuegaug S O __31 j flimecock 2 44 JPCB EXCMMEFFI 11 9537500 amp 46 JPCB EIAMFF 95981 v 47 PCB cabe 9526000 __ 57AB 8572989 57CD 8572990 58 j Faniletgasket 5943 61 jVentui exhaustmanifold neader 5 34 72AB E03818 Airpressureswith 5716581 72CD 02071 Air pressure switch __ 5162 75 Fastening spring 57017 84 379079 Automaticairreleasevave 564254 85 14030 569387 87 jOrng 0 514 89AB_ X Secondaryexchanger plate type exchanger 23 W 571646 89CD Secondaryexchanger plate type exchanger 27kW __ 573295 90 Oring secondary exchanger 57385 92 571807 96 164282 8 o 1 1 1 5735231 O 98AB _______ 997150 98D Pum i 997151 101 379976 Gasvalve SlTTandem Z o 570733 108 JSpakgeneratr 573023 100 ________
34. Heating Circuit BO7 Microswitch for Diverter Valve 08 Time Clock Colours Gry Grey Rd Red Blue Grn YII Yellow Green Wh White Brn Brown Blk Black Wh Rd White Red 25 23 27 wt 3 0111 112 aim 1 2 8 4 5 6 7 8 12 ec e pu 7181514 3121 cum 14 ta ten t Wy 21 om m m ON d 8029 26 4 SHORT SPARE PARTS LIST A 23 MFFI e 7874 72 Tt 69 70 69 68 67 66 65 64 63 4 C gu dm g Se a w EI cap j 6 mu Te c 3 i 75 i do amp C r oo Eme n ure bn E s A CERE 24 25 26 28 30 31 32 33 34 38 35 37 36 38 2 es 515 j az i at 4 oe a 515 hz1 ur p E 546 E gt bid cu wn ts eu m 513 Blt en m SF LE n ni MODELS CHARACTERISTICS SERIAL REF X VALIDITY A 23 UK 2320019700001 z A 23 LPG 232001 37000601 B029 27 23 nT eee 732 19 ___ 28059
35. INPUT 3 AMP 22 to ion Diagram for Connect Ariston Unvented Cylinder iring W 6 2 uo peseg see section 2 10 to 9 10 room stat terminal block on the the junction box from the the P C B then connect O x o O gt FEE BOILER ELECTRICAL SUPPLY CABLE TYPICAL JUNCTION BOX T 50 Se c uu ce co BROWN 090 pue d 0206 9 0 1 246 226 22451 20951 19 NO MH 0002 tate 7 S Yul ou iti Pe ra e canons 6 2 Nn 009 00h ejeuos Auoudui g 6 1 001 06 dS 1491694 10 3 8 2 9 10 3 ORANGE GREENNELLOW V4043H HEATING VALVE e BROWN e ORANGE e GREENNELLOW HOT WATER VALVE YdAWNVaSOdd 9 6 JUI 4 owebues 9 XUI 9 9 1 204 LOZ 9 9 6 3 201 01 1006 100044 521041 000 0002d3 JABOJIIN 02 4 6 9 10081
36. JUNCTION BOX reverse of the boiler control panel see section 2 10 to 9 10 on the junction box Based on Honeywell controls 27 27 Genus 23 27 30 Genus 27 System T6360B ROOM THERMOSTAT PROGRAMMER T 4 BLUE GREY e GREENYELLOW V4043H VALVE oz e N o 5 1 e LO 1 1 C lt e N N Qa L e 2 5 o gt cr ES 50 1 SWITCHMASTER 805 900 SP 50 100 Link 1 3 Symphony Sonata Switchmaster 400 600 Sunvic ET 1451 Switchmaster m a lt e 2 S Pegler Sunvic N r ETES E PROGRAMMER d AND T6360B ROOM THERMOSTAT Honeywell ST 699B 1002 Link L 5 8 ST 6400 ST 6300 ST 6200 Horstmann 425 525 527 i RWB2 Glowworm Mastermind Landis amp Gyr RWB20 Potterton EP2000 3000 Link L 5 EP2001 3001 Randall 102 102 E Microgyr Sangamo 410 Form 1 Potterton Miniminder Randall 4033 Link 1 6 Randall 701 702 Sangamo 5 Link 3 6 Landis amp G Link 1 6 If a room thermostat is not requied on Zone 1 insert a link between 4 5 on the junction box If a room thermostat is not requied on Zone 2 insert a link 240V between 6 8 on the junction box MAINS
37. PM mode Notes If you keep the h and keys pressed down for more than 2 seconds the display will enter fast forward scroll mode ENTERING THE SWITCHING TIMES If your entry is incomplete the segments not yet selected will blink in the display You have 20 memory locations available Each swit ching time takes up one memory location Keep pressing the Prog key until a free memory location is shown in the display Program ON or OFF with the key 9 ON O OFF Enter the hour using h enter the minutes using m If a switching command is to be carried out every day 1 2 3 4 5 6 7 then store using the gt key otherwise select the days it is to be carried out on by using the Day key When the day selection is left blank the programmed switching instruction 234561 th 3 12 operates at the same time every day Monday Saturday Sunday Saturday Friday Sunday selection of single days Store using the key or push Prog key if you are going to continue programming The time switch enters the automatic operating mode and displays the current time of day Begin any further entry of a switching time with the Prog key If necessary once you have finished programming and have returned to the current time display by pressing the utton the timer will not auto matic
38. be in accordance with the relevant recommendation of BS 5546 1990 Copper tubing to BS EN 1057 1996 is recommended for water carrying pipe work and must be used for pipe work carrying drinking water Residual Head of the Boiler 700 0 100 20 0 40 50 60 70 90 100 10 1200 1300 1400 Flue System The provision for satisfactory flue termination must be made as described in BS 5440 1 The appliance must be installed so that the flue terminal is exposed to outdoor air The terminal must not discharge into another room or space such as an out house or lean to is important that the position of the terminal allows a free passage of air across it at all times The terminal should be located with due regard for the damage or discoloura tion that might occur on buildings in the vicinity In cold or humid weather water vapour may condense on leaving the flue termi nal The effect of such steaming must be considered If the terminal is less than 2 metres above a balcony above ground or above flat roof to which people have access then a suitable terminal guard must be fitted When ordering a terminal guard quote the appliance model number A suitable terminal guard is available from TOWER FLUE COMPONENTS Morley Road Tonbridge Kent TNS 1RA The minimum acceptable spacing from the terminal to obstructions and ventila tion open
39. disconnect the integral time clock plug from the P C B 9 Using a volt free switching time clock connect the switching wires from the time clock following points 1 7 above 101f using a time clock and room thermostat these must be connected series as per points 1 9 above Note Only a two wire type room thermostat can be used 14 B023 2 11 Electrical Diagram 023 gt Low Voltage P C B Flame Failure L E D Insufficient Water Pressure L E D Water Temperature Indicator L E D s Overheat Thermostat Warning L E D System Reset Button Selector Knob for Operating Mode Domestic Hot Water Temp Adjustment Central Heating Temp Adjustment Wire Connector for Room Thermostat Connector for Total Check System Anti cycling Device Adjustment for Heating Soft light Adjustment Max Heating Temperature Adjustment Time Clock Connection On Off L E D On Off Switch Interface Wire for P C B s Relay Motorised Valve Ignitor Relay Gas Valve Relay Fan Relay Circulation Pump Relay Adaptor British Gas use only Selector TCS2 lt lt lt gt D 01 Air Pressure Switch 02 Fan 03 Gas Valve 04 Ignitor 05 Motorised Valve 06 Circulation Pump 07 Flame Detector 08 Earth Terminal 09 Flame Detection Circuit 10 Flame Indicator L E D
40. of Water for Domestic Use Minimum Temperature of Water for Domestic Use Working pressure max Working pressure min Flow rate AT 25 C Flow rate AT 35 C Minimum flow rate ELECTRICAL DATA Electrical Supply Frequency Power Consumption Protection of Electrical System CATEGORY Nominal Pressure Methane Gas G20 Nominal Pressure Liquid Gas G30 G31 kW Btu h kW Btu h kW Btu h kW Btu h C C bar bar litres A 23 MFFI 25 6 87364 11 0 37539 23 1 78491 9 2 31396 90 2 87 8 A 27 MFFI 29 8 101707 12 0 40956 27 3 92492 10 1 34471 90 6 91 6 88 3 472 MODELS 23 27 LEGEND BODE F 0 L I A Ignition Lockout Reset Button Safety Overheat Thermostat Reset B Ignition Lockout L E D XX 40 50 60 70 80 TE C Selector Knob for Summer Winter Flue Analysis Modes 5 2 ao 9 m D Low System Water Level L E D AN FA Temperature Adjustment Knob for Domestic Hot Water Heating System Thermometer G Safety Overheat Thermostat Intervention L E D H Adjustment Knob for Heating Temperature ARISTON On Off L E D L On Off Switch O Heating System Pressure Gauge 6 B022 OPERATING INSTRUCTIONS CAUTION Installation start up adjustments and maintenance must be perfor med by a competent person only in accordance with the Gas Safety Installation amp Use Regulations 1984 and the instruc
41. per the table below Once the gas pressure is set turn off the boiler and reconnect the connec tion to P C B NB It may be necessary to reset the flame failure reset a number of times during this operation MATURAL GAS 520 BUTANE GAS G30 PROPANE GAS GH pressure ka sel 3 85 in wg 18 mas 7 wig 1B mbar 7 4 11 Regulating the heating power natural gas G20 Regulating the heating power for butane gas G30 Regulating the heating power for propane gas G31 TABLE A GAS Go pressure Burnet pressure Eum g pressure injector ACT 12 PRESSURE B 4142 1818 17 18 1 20 21 2221 24 28 2927 B a Don 18 14 HB 18 17 16 18 20 i x OPERATIMG POA mt EN wa X bee BERBER SERS aea Li dd Pd Pili Gai os Pia Bat uz as ua HB a r s B TB 12 12 14 7618 17 18 718 2 PITER mM min NATURAL GAS 1520 BUTMEGAS 330 5 524 i2m n 423 123 than 1 amp 2 8029 8029 Anti cycling Device Soft light A
42. period Check the system pressure and if it has dropped open the filling loop again to bring the pressure back up to 1 bar Check the exhaust flue for the fumes produced by combustion Make sure that all gate valves are open Turn on the gas cock and check the seals on the connections including the one for the burner making sure that the meter does not signal the passage of gas Check the connections with a soap solution and eliminate any leaks 5 Press the reset button A for the lighting system the spark will light the main burner If the burner does not light the first time repeat the procedure Check the minimum and maximum pressure values for the gas going to the burner adjust it if needed using the values indicated in the table in section 4 See the relative section for burner pressure adjustment within the servicing manual 3 5 Operational The boiler was designed to make it easy to regulate and check the various Adjustments features To access the areas where the adjustment and control devices are located simply remove the plugs by pressing from the inside unscrew the screws A and remove the bottom part of the instrument panel rotating it upward Right hand side service panel also provides access to the power supply cord connector the fuses Left hand side the potentiometer for regulating the ignition delay anti cycling feature which can be set from 0 to
43. screws X from the bottom of the gas valve pipe see fig 1 34 Attention The gas valve is connected with two pipes as shown with an O ring connection SY b NE 1 y amp rA Access to the Hydraulic Circuits Important Before any component is removed the boiler must be drained of all water Removing the D H W secondary exchanger 1 Remove the screw Y see fig 1 37 2 Push the exchanger towards the rear of the boiler lift upwards and remove out of the front of the boiler 3 Before replacing the exchanger ensure that the O rings are in good condition and repla ce if necessary 8029 8029 Removing safety valve 1 Loosen nut Z see fig 1 38 2 Unscrew and remove the valve see fig 139 Removing the automatic air vent 1 Unscrew valve A1 see fig 1 39 5 y Hw gt NAT T Tris p rur SU P af Removing main circuit flow switch 1 Remove the cable of the main circuit flow switch see fig 1 41 2 Remove the screws A4 see fig 1 42 3 Remove the main circuit flow switch 15 Removing the pu
44. to the flow Removing the air pressure switch 1 Disconnect the electrical connections and silicone pipes L from their connection points see fig 1 20 2 Remove screws J on the top of the sealed chamber see fig 1 21 Use a No 2 star tip screwdriver to remove the switch from the plate B029 Removing the venturi device 1 Disconnect the silicone pipes and remove the screw N see fig 1 22 2 Extract the venturi see fig 1 23 OO Removing the fan 1 Disconnect electrical connections and remove screws O using a No 2 star tipped screwdriver see fig 1 24 2 Pull fan to the right forward and remove see fig 1 25 3 Remove fan from mounting plate 4 Remove screws P see fig 1 26 8 B029 14 Servicing and Removal of the Gas Valve SIT SIT SIGMA eme TANDEM tth l k 5 pi gt ieee H I E IE 029 9 10 Setting gas pressures Setting the minimum and the maximum power of the boiler 1 Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas 2 do this remove the screw A Fit the pipe of the pressure gauge to the pressure connection of t
45. 02 574232 108 574233 112 573441 569390 569560 569561 572271 572277 NENNEN 1 Spark generator 4 379981 Detectionelectrode ____________________________ 164261 Gasketi A o o 1 1 1 1 1 Oo 118 379979 lgniionelectrode R H 1 1 1 119 379980 electrode LH J 1204 02026 Mainbumer 2 Manbumer J J 1200 E02078 Mainbumer 1 572343 572372 121 Main 1 572749 121CD Main exchanger 14 572835 Front panel runner kit 4 571993 571444 997029 2 571443 7 571442 571447 571446 571547 571772 571771 571770 573138 EE 569281 569282 p Ls D HW actuatorkt S SIT Sigma gas valve operator coils Hea ngbypasskit DHW pressure switch kit pM SS _ pu DENEN 164311 321 361 3 way spring kit 164 311 Burner jet 0 72 fullkit LPG y O 12 UU B029 372 373 374 375 381 382 o 02 co co ro Ino Iro A 66 Alo c3 c3 ES m No 23 27 SIT Tandem Gas Valve 1 fExpasinvese 57324 amp 11 1425 Gasket 3 4 5 350 14 jOvemeatthermstat 9726 __ 17 Jj MaiflwSwich 594 18 164338 Tempprobe
46. 72 5 2749 572835 571444 570712 573740 573745 571443 571442 571447 571446 571547 571772 571771 571770 573138 569281 569282 122D _____ 123AB Main exchanger 123CD _____ Main exchanger 311 D H W actuator kit 321 SIT Tandem gas valve operator coils 322 SIT Tandem modureg coil 323 Gas modulator cartridge Heating by pass kit pressure switch kit 3 spring kit D H W diaphram valve 371 Main switch diaphram Main flow switch magnet Main flow switch spring Main flow switch top flow switch reed system 164311 Burner jet 1 25 full kit Natural gas Burner jet 0 72 full kit LPG 381 164 311 CO Co CO CO Co Co 6 45 45 45 C3 Manufacturer Commercial subsidiary Merloni TermoSanitari SpA Italy MTS GB LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone 01494 755600 Fax 01494 459775 Technical Service Hotline 01494 539579 Stampa BIEFFE Recanati 23 99 84 1268 000 029 Q ARISTON 472 23 A 27 GCN 47 116 18 47 116 19 Installation Instructions Type C Boilers LEAVE THESE INSTRUCTIONS WITH THE END USER bench N mar J Country of destination GB TABLE OF CONTENTS 1 1 1 1 3 2
47. Hydraulic Circuit Removing the D H W Secondary Exchanger Removing the Safety Valve Removing the Automatic Air Vent Removing the Main Flow Circuit Switch Removing the Pump Removing the Pressure Gauge Removing the Expansion Vessel Removing the Overheat Thermostat Removing the Heating Temperature Sensor N T C 1 6 Access to the Control System Checking the Fuses Removing the Time Clock Removing the 5 2 FAULT FINDING 2 1 Fault Finding Guide Flow chart 2 2 Fault Finding Using the Total Check System 3 ELECTRICAL DIAGRAMS 3 1 Electrical Connection 3 2 Functional Flow Connection 4 SHORT SPARE PARTS LIST Page No AAO NNO C1 Cl 12 12 13 13 13 14 14 15 15 15 16 16 17 18 23 24 25 26 8029 1 1 1 1 2 029 SERVICING INSTRUCTIONS Replacement of Parts To Gain General Access To ensure efficient safe operation it is recommended that the boiler is serviced annually by a competent person Before starting any servicing work ensure both the gas and electrical supplies to the boiler are isolated and the boiler is cool Before and after servicing a combustion analysis should be made via the flue sampling point please refer to the Installation Manual for further details After servicing preliminary electrical system checks must be carried out to ensure electrical safety i e polarity earth continuity resistance to earth and sho
48. LPG 569282 2 2 30 B029 23 27 SIT Tandem Gas Valve B029 1 Expansion vessel 573294 Gasket 3 4 573520 14 Overheat thermostat 997206 17 flow Switch 573224 Temp probe C H W 569236 19 Microswitch for 3 way main flow group 573340 23 Gasket 1 2 5 3528 378 814 Manual vent cock 573727 Safety valve 3 bar 1 2 573172 Pressure gauge 571649 clock 997207 Ps CB EX C MI FFI 953730 Ps CB EI A MFFI 952981 P C B cable 952610 57AB 572989 5700 572990 Fan inlet gasket 573343 2 Venturi exhaust manifold header 573314 72AB Air pressure switch 571651 72CD Air pressure switch 571652 Fastening spring 570717 Automatic air release valve 564254 Gasket 1 569387 O O ing 571449 89AB Secondary exchanger plate type exchanger 23kW 571646 89CD exchanger plate type exchanger 27kW 573295 Oring secondary exchanger 573825 92 O ring 20 18 571807 Gasket 3 8 573521 98AB 997150 98CD Pump 997151 101 Gas valve SIT Tandem 570732 5 3023 571965 Spark generator se _________ 13 379981 114 3 9 981 Detection electrode 573441 118 Gasket 1 4 569390 120 electrode R H 569560 121 gnition electrode L H 569561 122A Main burner 572271 12288 Main burner 572277 122C Main burner 572343 5723
49. Thermostat Reset Ignition Lockout L E D C Selector Knob for Summer Winter Flue Analysis Modes D Low System Water Level L E D Temperature Adjustment Knob for Domestic Hot Water F Heating System Thermometer Safety Overheat Thermostat Intervention L E D H Adjustment Knob for Heating Temperature On Off L E D On Off Switch O System Pressure Gauge Warning the flue analysis mode must only be selected by a qualified service engineer 18 B023 3 4 Initial Start up The checks to be run before initial start up are as follows 1 Make sure that the screw on the automatic air valve has been loosened when the system is full f the water pressure in the system is below 1 bar bring it up to appro priate level Check to see whether the gas cock is closed Make sure that the electrical connection has been made properly and that the earth wire is connected to an efficient earthing system Supply power to the boiler by pressing the On Off switch lt L gt the L E D I will turn on turn the selector knob to the lt winter gt setting This will start the circulation pump After 7 seconds the boiler will signal a shut down due to failure ignition Leave the boiler as it is until all of the air has been bled from the lines Loosen the cap on the head of the pump to eliminate any air pockets Repeat the procedure for bleeding the radiators of air the taps for a brief
50. Time Clock Colours Gry Grey Rd Red Grn YII Yellow Green Wh White Brn Brown Blk Black Wh Rd White Red 8029 23 27 D 5 50 60 70 8 100 7 Aa 8 Fuse 2A Fuse 2A W IN 230 I4S IN O X3 OOOOO0
51. W BS 6798 1987 Forced circulation hot water system BS 5449 1990 Installation of gas hot water supplies for domestic purposes 2nd family gases BS 5546 1990 Flues BS 5440 1 1990 Air supply BS 5440 2 1989 The appliance may be installed in any room or indoor area although particular attention is drawn to the requirements of the current Wiring Regulations and in Scotland the electrical provisions of the Building Regulations applicable in Scotland with respect to the installation of the combined appliance in a room containing a bath or shower Where a room sealed appliance is installed in a room containing a bath or shower the boiler and any electrical switch or appliance control utilising mains electricity should be situated so that it cannot be touched by a person using the bath or shower The location must permit adequate space for servicing and air circulation around the appliance as indicated in paragraph 2 4 The location must permit the provision of an adequate flue and termination For unusual locations special procedures may be necessary BS 6798 1987 gives detailed guidance on this aspect A compartment used to enclose the appliance must be designed specifically for this purpose No specific ventilation requirements are needed for an installation within a cupboard This appliance is not suitable for outdoor installation The type C appliances in which the combustion circuit air vent intake and combustion chamb
52. ally switch to the current programmed status until the next timed set ting You can put the timer into the correct mode with the 8022 ADDITIONAL FUNCTIONS Switching from summer time to winter and vice versa Press the 1h key once MANUAL OVERRIDE KEY With the lt you can change the current switching settings at any time The switching program already entered is not altered Automatic Manual Continuous Operation Operation Operation d d d 05 30 05 30 05 30 d 0 ub Ju 0630 7 d ub Ju The switching times cor respond to the program entered If the current switching mode is changed manual ly the next switching time will be carried out auto matically again according to the entered switching program You can only return to automatic mode from the continuously ON and continously OFF swit ching modes by pressing the key READING THE PROGRAMMED SWITCHING TIMES Pressing the Prog key displays the programmed switching times until the a first free memory location appears in the display If you now press the Prog key once again the number of free memory locations will be displayed e g Fr 20 If all memory locations are occu pied the display Fr 00 appears CHANGING THE PROGRAMMED SWITCHING TIMES Press the Prog key rep
53. anger efficiency control Heating circuit efficiency control Heating temperature control D H W temperature control 25 3 ELECTRICAL DIAGRAMS 26 Legend High Voltage P C B Low Voltage P C B Flame Failure L E D Insufficient Water Pressure L E D Water Temperature Indicator L E D s Overheat Thermostat Warning L E D System Reset Button Selector Knob for Operating Mode Domestic Hot Water Temp Adjustment Central Heating Temp Adjustment Wire Connector for Room Thermostat Connector for Total Check System Anti cycling Device Adjustment for Heating Soft light Adjustment Max Heating Temperature Adjustment Time Clock Connection On Off L E D On Off Switch Interface Wire for P C B s Relay Motorised Valve Ignitor Relay Gas Valve Relay Fan Relay Circulation Pump Relay Selector TCS2 Adaptor British Gas use only gt lt lt 01 Air Pressure Switch 02 Fan 03 Gas Valve 04 Ignitor 05 Motorised Valve 06 Circulation Pump 07 Flame Detector 08 Earth Terminal 09 Flame Detection Circuit 10 Flame Indicator L E D 11 Transformer 12 Filter BO1 Over Heat Thermostat BO2 Room Thermostat Gas Valve Modulator B05 Heating Sensor BO6 Pressure Switch for Heating Circuit 807 Microswitch for Diverter Valve BO8
54. are given in BS 6798 1987 and BS 5449 1 1990 the following notes are given for general guidance Pipe Work Copper tubing to BS EN 1057 1996 is recommended for water pipes Jointing should be either with capillary soldered or compression fittings Where possible pipes should have a gradient to ensure air is carried naturally to air release points and water flows naturally to drain taps The appliance has a built in automatic air release valve however it should be ensured as far as possible that the appliance heat exchanger is not a natural collecting point for air Except where providing useful heat pipes should be insulated to prevent heat loss and avoid freezing Particular attention should be paid to pipes passing through ventilated spaces in roofs and under floors By pass The appliance includes an automatic by pass valve which protects the main heat exchanger in case of reduced or interrupted water circulation through the heating system due to the closing of thermostatic valves or cock type valves within the system System Design This boiler is suitable only for sealed systems Drain Cocks These must be located in accessible positions to permit the draining of the whole system The taps must be at least 15mm nominal size and manufactured in accordance with BS 2870 1980 Safety Valve Discharge The discharge should terminate facing downwards on the exterior of the building in a position where discharging possibly boiling water am
55. as valve DO ES THE 2 Check power supply PCB BURNER LIGHT 3 Check control PCB ofthe valve 1 Check whether flame SA FETY detection electrode is SHUTDO W OF THE hit by the flame BO ILER ACTIVA TED YES gt 2 Check the electrode 3 Check the power PCB 4 Check the control PCB WAS THE 4 NO RESET SW ITCH PRESSED YES i Shutdown LED off Restart of the fan B029 23 15 THERE STILL A PROBLEM INO FUNCTIONS NORMALLY LISTOFMALFUNCTIONS PO SSIBLE CA USES ON 1 Delivery of hotwater for domestic use Airin thesecondary exchanger when thetap isturned on the burner goesout Hotwater pressure switch is defective 3 way valve is defective 2 Delivery of hot water for domestic use 3 way valve is defective the radiatores are heated in summer mode 3 Delivery of hot water for domestic use Check heating sensors water temperature is not satisfactory Check gas settings and regulation Check water flow rate Check exchanger for domestic hot water 4 Delivery of hot water for domestic use Primary exchanger is defective noisy operation Low water pressure in heating system Check gas settings and regulation 5 az E Drop increase in pressure in primary circuit Check for leaksin heating circuit Defective water supply inlet valve Secondary exchanger is defective Expansion vessal is empty 6 Repeated
56. changers fins clean the exhaust side of the exchanger and fan if necessary 8 Regulate the gas pressure ignition pressure partial flame maximum flame 9 Check proper operation of the heating safety system maximum safety temperature maximum safety pressure 10 Check the proper operation of the gas safety system gas or flame safety device gas valve safety device 11 Check that the electrical connections have been made in compliance with the instructions shown in the installation instructions 12 Check the efficiency of the hot water supply flow and temperature 13 Check general operation of the appliance 14 Check the exhaust system for the combustion products 1 2 Technical Information CE Certification Heat Input max min kW 25 611 0 29 8 12 0 max min kW 23 1 9 2 27 3 10 1 Efficiency of Nominal Heat Input Efficiency at 30 of Nominal Heat Input Heat Loss to the Casing T 50 C Flue Heat Loss with Burner Operating Flue Heat Loss with Burner Off Maximum Discharge of Fumes G20 G25 Residual Discharge Head mbar Consumption at Nominal Capacity G20 G25 m h 2 72 3 32 3 16 3 86 Gas Consumption after 10 Minutes 0 32 0 39 0 37 0 45 15 C 1013 mbar G30 G31 Kg h 2 02 2 00 2 35 2 32 Temp of exhaust fumes at nominal capacity G20 G25 C 137 128 Content 5 8 6 6 Content 9 2 8 0 CO Content 34 Minimum Ambient Temperature 5 Head Loss on Water Side max
57. ck the seals on the connections including the one for the burner making sure that the meter does not signal the pas sage of gas Check the connections with a soap solution and eliminate any leaks 5 Press the reset button A for the lighting system the spark will light the main burner the burner does not light the first time repeat the procedure 6 Check the minimum and maximum pressure values for the gas going to the burner adjust it if needed using the values indicated in the table in section 4 See the relative section for burner pressure adjustment within the servicing manual 3 5 Operational The boiler was designed to make it easy to regulate and check the various features To Adjustments access the areas where the adjustment and control devices are located simply remove the plugs by pressing from the inside unscrew the screws A and remove the bottom part of the instrument panel rotating it upward Right hand side service panel also provides access to the power supply cord connector the fuses Left hand side the jumper for regulating the ignition delay anti cycling feature which can be set from 0 to 2 minutes factory set at 1 minute the potentiometer for regulating the soft light feature the setting for whichcan range from the minimum ther mal power to the maximum the potentiometer for the maximum thermal power for the heating system maximum thermal power setting
58. crews A9 see fig 1 56 9 Replace either P C B in reverse order 19 2 FAULT FINDING 2 1 Fault Finding Guide Flow chart is possible to detect and correct any defect by using the standard fault finding diagrams described in this chapter ISHOT W ATER BEING DEMANDED FO ILERS EQ UIPPED W ITH AN ELECTRO NIC AN T FREEZE SYSTEM S THE SA FETY BEEN TRIGGERED TO ACTIVATE THE DEVICE T sensor lt 5 C Preliminary Checks ake sure that 1 There is sufficient water in the system 2 The gasis turned on 3 The electricity to the boiler ison Press the On Off Button THE LIGHTfO R THE PO W ER SUPPLY COMEON YES SETTING MO DE FUM E DISCHA RGE TEST YES gt YES 1 Check the fuses 2 Check the power supply cord plug and outlet 3 Check replace the power ly PCB SUMMER FO R THE O PERA TING W INTER ISHOT W ATER BEING DEMANDED PRO GRAMMING TIMERAND OREXTERNAL THERM O STATNEED TO BEACTIVA TED 20 B029 1 Check for air in the system 2 Check the pressure switch for activating pump 3 Check replace water gauge and refill the the system properly 1 Turn the boiler off and then back on again safety reset DO ES THE CIRCULA TIO N PUMP COMEON DO ES THE IN SUFFICIENT W A TER IN DICA TO R UGHTCO ME O N within 40
59. ctions please consult the separate User s Manual User s _ ON A 23 SURO Cons A 27 MFFI G ARISTON Read the instructions and recommendations in these Installation Instructions carefully to ensure proper installation use and maintenance of the appliance Keep this manual in a safe place You may need it for your own reference while our Servicing Centre technicians or your installer may need to consult it in the future This is a combined appliance for the production of central heating C H and domestic hot water D H W This appliance must be used only for the purpose for which it is designed The manufacturer declines all liability for damage caused by improper or negligent use No asbestos or other hazardous materials have been used in the fabrication of this product Before connecting the appliance check that the information shown on the data plate and the table on pages 4 5 comply with the electric water and gas mains of the property You will find the data plate on the reverse of the control panel The gas with which this appliance operates is also shown on the label at the bottom of the boiler Do not install this appliance in a damp environment or close to equipment which spray water or other liquids Do not place objects on the appliance Do not allow children or inexperienced persons to use the appliance without super
60. djustment Max Heating Adjustment 10 Remove the pipe from the pressure gauge and connect screw to the pressure outlet in order to seal off the gas 11 Carefully check the pressure outlets for gas leaks valve inlet and outlet IMPORTANT Whenever you disassemble and reassemble the gas connections always check for leaks using a soap and water solution Setting the anti cycling device This appliance is equipped with a potentiometer which delays the ignition of the heating control and is situated on the P C B see the electrical diagrams By adjusting the potentiometer it is possible to change the time interval between the burner shutting down and its next ignition It is preset at 1 minute and can be adjusted from 0 to 2 minutes Use this control in particular situations where continuous shutting down and ignition of the main burner occurs Removing the spark generator SIT Sigma gas valve 1 Disconnect ignition leads U by pulling upwards see fig 1 30 2 Remove the screws V see fig 1 31 with a Pozidrive No 2 star tip screwdriver 3 Remove the spark generator 13 14 M TSN 7 24 Removing the gas valve 1 Disconnect all the cables from the solenoid and modureg 2 Remove the spark generator 3 Release the top nut W using a 30 mm open ended spanner see fig 1 33 4 Remove the
61. e Check proper operation of the heating safety system maximum safety temperature maximum safety pressure 10 Check the proper operation of the gas safety system gas or flame safety device gas valve safety device 11 Check that the electrical connections have been made in compliance with the instructions shown in the installation instructions 12 Check the efficiency of the hot water supply flow and temperature 13 Check general operation of the appliance 14 Check the exhaust system for the combustion products A 23 MFFI A 27 MFFI I LAK ARAL A OND Ci Fig 1 1 11 NO 2 um J RT I 1 A Y is jJ 23 22 21 20 19 18 17 16 15 14 1 Flue Connector 2 Combustion Chamber Hood 3 Main Heat Exchanger 4 Combust
62. e area indicated in Fig 2 8 by breaking the perforated ring 2 Use a tool to grasp the lid and remove it completely 3 Clean any burrs or sharp edges with a knife or an appropriate tool R gt Fig 2 9 In Fig 2 10 below several different types of flue systems are shown For additional information regarding the flue accessories please consult the Flue Pipe Accessories manual 2 8 3 4 5 g 6 D e 6 9 i oi Iu L max 500 mm 4 42 13 13 Fig 2 10 Maximum Extension Diameter of Pipes Use of a Restrictor Exhaust Type Exhaust Air mm on the Discharge Side Risk of Condensation Forming 60 100 Coaxial System 60 100 60 100 L lt 7 m 23 kW L lt 5 m 27 kW gt 49 m 23 kW L gt 6 5 m 27 kW L 7 m 23 kW L lt 5 m 27 kW gt 4 9 m 23 kW L gt 6 5m 27 kW Twin Pipe Systems L 7 m 23 kW L 5 m 27 kW gt 4 9m 23 kW gt 6 5m 27 kW L 7 m 23 kW L 5 m 27 kW gt 4 9m 23 kW L gt 5 3m 27 kW
63. e electrode in the positioning hole carefully otherwise the elec trode may break b Check that the cables have been connected correctly c Check that the rubber gasket covers the cable electrode connection point completely Removing main heat 1 Drain the boiler of water exchanger 2 Release the two connection nuts K connecting the exchanger to the flow and return pipes see fig 1 18 3 Pull it straight out see fig 1 19 A 23 MFFI a Rz A 27 MFFI Removing the air pressure switch 1 Disconnect the electrical connections L and silicone pipes M from their connection points see fig 1 20 2 Remove screws on the top of the sealed chamber see fig 7 21 Use a No 2 star tip screwdriver to remove the switch from the plate 8 8029 1 Disconnect the silicone pipes and remove screw P see fig 1 22 2 Extract the venturi see fig 1 23 Removing the venturi device Removing the fan 23 A 23 MFFI 1 Disconnect electrical connections Q see fig 1 24 2 Remove screws R see fig 1 25 3 Pull fan to the right forward and remove see fig 126 8029 10
64. e ferrule mounted on the other supply cord The blue wire should be connected to the terminal marked N The brown wire should be connected to the terminal marked L Note The diagrams for the electrical system are indicated in section 2 11 Warning this appliance must be earthed External wiring to the appliance must be carried out by a qualified technician and be in accordance with the current Regulations and applicable local regulations The EuroCombi range of boilers are supplied for connection to a 230 V 50 Hz supply The supply must be fused at 3 A The method of connection to the electricity supply must facilitate complete elec trical isolation of the appliance by the use of a fused double pole isolator hav ing a contact separation of at least 3 mm in all poles or alternatively by means of a 3 A fused three pin plug and unswitched shuttered socket outlet both complying with BS 1363 The point of connection to the electricity supply must be readily accessible and adjacent to the appliance unless the appliance is installed in a bathroom when this must be sited outside the bathroom The local gas region contractor connects the gas meter to the service pipe If the gas supply for the boiler serves other appliances ensure that an adequate supply is available both to the boiler and the other appliances when they are in use at the same time Pipe work must be of an adequate size Pipes of a smaller size than the b
65. e formation of limescale in the secondary heat exchanger Regardless of the flow rate and the temperature in the circuit for the domestic hot water the temperature is limited to 62 C 6 Safety Shut off At the start of every lighting phase the P C B performs a series of internal controls If a malfunction occurs the boiler will shutdown until the problem has been resolved 2 Draining the heating system The heating system must be emptied as follows Turn off the boiler Open the drain valve for the system and place a container below to catch the water that comes out Empty the system at the lowest points where present If you plan on not using the heating system for an extended period of time it is recommended that you add antifreeze with an ethylene glycol base to the water in the heating lines and radiators if the ambient temperature drops below 0 during the winter This makes repeated draining of the entire system unnecessary Draining the domestic hot water system Whenever there is the danger of the temperature dropping below the freezing point the domestic hot water system must be drained as follows Turn off the general water valve for the household plumbing system Turn on all the hot and cold water taps Empty the remaining water from the lowest points in the system where present 4 GAS ADJUSTMENTS CATEGORY 12 3 Methane Gas Liquid Butane Gas Liquid Propane Gas Lower Wobbe Index
66. earth continuity resistance to earth and short circuit The life of individual components vary and they will need servicing or repla cing as and when faults develop The fault finding sequence chart in chapter 2 will help to locate which com ponent is the cause of any malfunction and instructions for removal inspec tion and replacement of the individual parts are given in the following pages All testing and maintenance operations on the boiler require the control panel to be lowered This will also require the removal of the casing To dismantle the front part of the casing proceed as follows 1 Remove screw see fig 1 1 2 Lift the front panel up and forward see fig 1 2 Removing side panels 1 Remove the screws 2 Pull the panel away from the boiler then lift the panel up and away from the boiler see fig 1 2 To lower control panel 1 Remove the screws 2 Push the two side panels outward slightly fig 1 5 3 Rotate the control panel forward and down To access the areas where the adjustment and control devices are located simply remove the plugs by pressing from the inside unscrew the screws and remove the bottom part of the instrument panel rotating it upwards G ARISTON 8029 1 3 Access to Combustion Chamber
67. eatedly until the switching time you want to chan ge is displayed You can now enter the new data See Entering the swit ching times 13 A Notes on storing switching times aZ you end your entry of the switching times by pressing the Prog key the switching time you have entered will be stored and the next memory loca USEFUL INFORMATION AND TROUBLESHOOTING 1 tion displayed Entry of further switching times is also carried as descri bed in Entering the switching times In addition a complete switching command is stored automatically after around 90 seconds provided no other key is pressed The time switch then enters the automatic operating mode and displays the current time again DELETING INDIVIDUAL SWITCHING TIMES Press the Prog key repeatedly until the switching time you wish to dele te is shown in the display Then set to using the h or m key and keep the key pressed down for around 3 seconds The switching time is now erased and the current time is displayed TECHNICAL DATA Ambient temperature 10 C to 55 C Running reserve 5 h not for 1 5 V DC Memory locations 20 Shortest switching time 1 minute Programmable Every minute 14 BOILER SHUTDOWN The boiler unit is equipped with safety devices which intervene in certain situations to shutdown the boiler Some of these situations are signalled by the un
68. ent No 635 Electricity at work regs 1989 Installation should also comply with the following British Standard Codes of Practice Low pressure pipes BS 6891 1988 Boilers of rated input not exceeding 60 kW BS 6798 1987 Forced circulation hot water system BS 5449 1990 Installation of gas hot water supplies for domestic purposes 2nd family gases BS 5546 1990 Flues BS 5440 1 1990 Air supply BS 5440 2 1989 The appliance may be installed in any room or indoor area although particular attention is drawn to the requirements of the current Wiring Regulations and in Scotland the electrical provisions of the Building Regulations applicable in Scotland with respect to the installation of the combined appliance in a room containing a bath or shower Where a room sealed appliance is installed in a room containing a bath or shower the boiler and any electrical switch or appliance control utilising mains electricity should be situated so that it cannot be touched by a person using the bath or shower The location must permit adequate space for servicing and air circulation around the appliance as indicated in paragraph 2 4 The location must permit the provision of an adequate flue and termination For unusual locations special procedures may be necessary BS 6798 1987 gives detailed guidance on this aspect A compartment used to enclose the appliance must be designed specifically for this pur pose No specific ventilation requ
69. er are air tight with respect to the room in which the appliance 15 installed can be installed in any type of room There are no limitations with respect to ventilation and the volume of the room itself The boiler must be installed on a solid permanent wall to prevent access to the electrical parts when live through the aperture on the back frame B023 2 3 Overall Dimensions Legend A Central Heating Flow 3 4 B Domestic Hot Water Outlet 1 2 C Gas Inlet 3 4 D Domestic Cold Water Inlet 1 2 E Central Heating Return 3 4 24 Clearances In order to allow for access to the interior of the boiler for maintenance purposes the boiler must be installed in compliance with the minimum clearances indicated in the diagram below NN NNNNNNNNNN NNNNNNNNNNON B023 7 2 5 Mounting the Appliance Fasten the boiler in place using the template and anchors supplied with the unit It is highly recommended that a spirit level be used to position the boiler so that it is perfectly level For additional information please consult the instructions contained in the connection kit and the flue kit 2 6 Electrical Connection For safety purposes have a competent person carefully check the electrical system in the property as the ma
70. er of 80 mm 2 The maximum combined flue length is 17 m In this case the minimum length for the air intake pipe is 1 meter the maximum length of vertical exhaust pipe must be a maximum of 12 m 3 If an elbow is inserted into the discharge ventilation system the calculation of the overall extension must take into consideration the values for each curve as indicated in the table 4 The exhaust pipe must extend at least 0 5 m above the ridge of the roof if it is located on a side other than that for the air intake this is not obligatory if the exhaust and air intake pipes are located on the same side of the building B023 13 2 10 Room Thermostat In order to perform this procedure remove boiler cover as indicated in section Connection 3 2 Then proceed as follows 1 Remove the screws A located on the bottom part of the boiler 2 Widen the sides so that the control panel can be rotated 3 Open the cover B on the left hand side of the compartment 4 Insert the wire for the connection of the room thermostat into the wire holder as indicated in photo 3 5 Remove the grommet D shown in photo 5 make a hole in it and pass the room thermostat wire through 6 Remove the link located on the terminal and connect the wire 7 Replace the grommet and the terminal to their original positions close the cover on the grommet compartment and fasten the wire clamp C in place 8 lf a remote time clock is to be fitted
71. factory set at the maximum value unless indicated otherwise on the adhesive sticker located in proximity to the potentiometer The connection for the diagnostic device TCS 3 6 Combustion Analysis The boiler is designed to make it easy to analyse the combustion by products Using the especially designed apertures readings can be taken on the temper ature of the combustion by products and of the combustion air as well as of the concentrations of and etc The best maximum power test conditions for the heating system are when the selector is turned to the flue analysis setting 3 7 3 8 3 9 20 Fume Discharge Monitoring Boiler Safety Systems Draining the System The discharge ventilation of the exhaust fumes can be monitored to check for losses in general pressure in the system This is done to eliminate the cause of lighting failure with the main burner not indicated by a shutdown status With a differential manometer connected to the test socket on the combustion chamber the DP value for the air pres sure switch can be taken The measured value should not be less than 10 mbar under maximum thermal power condi tions with the knob on the flue test setting in order for the unit to function properly and without interruption The boiler is equipped with the following safety systems see section 3 3 for references 1 Ignition Failure This control signals an ignition failure o
72. for the water connections replacement of any faulty seals 2 Check the gas seals replacement of any faulty gas seals 3 Visual check of the entire unit 4 Visual check of the combustion process and cleaning of the burners if needed 5 f called for by check no 3 dismantling and cleaning of the combustion chamber 6 If called for by check no 4 dismantling and cleaning of the injectors 7 Visual check of the primary heat exchanger check for overheating in the blade assembly clean the exhaust fan if needed 8 Adjustment of the flow rate of the gas flow rate for lighting partial load and full load 21 9 Check of the heating safety systems Safety device for maximum temperature safety device for maximum pressure 10 Check of the gas safety systems safety device for lack of gas or flame detection electrode Safety device for gas cock 11 Check of the electrical connection make sure it complies with the instructions in the manual 12 Check of domestic hot water production efficiency delivery rate and tem perature 13 Check of the general performance of the unit 14 General check of the discharge ventilation of the combustion by products 6 MISCELLANEOUS 6 1 Wiring Diagram for Two Heating Zones e BROWN e BLUE BOILER ELECTRICAL SUPPLY CABLE e GREY e ORANGE Remove internal time clock plug from the the P C B then connect GREENTELLOW TYPICAL room stat terminal block on the SIVE
73. h Automatic Air Release Valve 19 Expansion Vessel Preliminary electrical system checks to ensure electrical safety must be carried out by a competent person i e polarity earth continuity resistance to earth and short circuit Filling the Heating System Remove the panels of the case and lower the control panel see point 3 2 for further information Open the central heating flow and return cocks supplied with the connection kit Unscrew the cap on the automatic air release valve one full turn and leave open permanently Close all air release valves on the central heating system Gradually open valve s at the filling point filling loop connection to the central heating system until water is heard to flow do not open fully Open each air release tap starting with the lower point and close it only when clear water free of air is visible Purge the air from the pump by unscrewing anticlockwise the pump plug and also manually rotate the pump shaft in the direction indicated by the pump label to ensure the pump is free Close the pump plug Continue filling the system until at least 1 bar registers on the pressure gauge Inspect the system for water soundness and remedy any leaks discovered Filling of the D H W System Close all hot water draw off taps Open the cold water inlet cock supplied with the connection kit Open slowly each draw off tap and close it only when clear water free of bubbles is visible Gas Su
74. hat it is perfectly level For additional information please consult the instructions contained in the con nection kit and the flue kit For safety purposes have a competent person carefully check the electrical system in the property as the manufacturer will not be held liable for damage caused by the failure to earth the appliance properly or by anomalies in the supply of power Make sure that the residential electrical system is adequate for the maximum power absorbed by the unit which is indicated on the rating plate In addition check that the section of cabling is appropriate for the power absorbed by the boiler The boiler operates with alternating current as indicated in the technical data table 1 2 where the maximum absorbed power is also indicated Make sure that the connections for the neutral and live wires correspond to the indications in the diagram The appliance electrical connections are situated on the reverse of the control panel see the servicing manual for further information N L L 160 mm p amp 4 Fig 2 3 Gas Connection Important In the event that the power supply cord must be changed replace it with one with the same specifications Make the connections to the terminal board locat ed within the control panel as follows The yellow green wire should be connected to the terminal marked with the earth symbol make sure to re use th
75. he gas valve When you have completed this operation replace the screw A securely into its housing to seal off the gas 3 To check the pressure supplied by the gas valve to the burner remove the screw Fit the pipe of the pressure gauge to the pressure outlet of the gas valve D Disconnect the compensation pipe either from the gas valve or from the sealed chamber 4 Set the On Off button to position 1 and the summer winter switch to the winter position To set the maximum power turn on the hot water tap and allow the hot water tap to run at a rate of about 8 litres minute so that the main burner lights Adjust nut E on the modureg to set the gas pressure displayed on the pressure gauge corresponding to the maximum power see table A page 11 5 To set the minimum power disconnect a supply terminal from the modureg and adjust screw Turn the screw clockwise to increase the pressure and coun ter clockwise to decrease the pressure displayed the pressure gauge corresponding to the minimum power see table A page 11 6 When you have completed the above operations turn off the hot water tap re connect the supply terminal to the modureg on the gas valve and replace the cap on the screw of the modureg Setting the maximum heating circuit power T set the maximum heating circuit power place the On Off button to position lt 1 gt and the summer winter
76. idrive No 2 star tip screwdriver 3 Remove the spark generator 8029 B029 Removing the spark generator SIT Tandem gas valve 1 Disconnect ignition leads Q1 by pulling upwards see fig 1 30 2 Remove the screws R1 see fig 1 31 with Pozidrive No 2 star tip screwdriver 3 Remove the spark generator 13 Removing the gas valve 1 Disconnect all the cables from the solenoid and modureg 2 Remove the spark generator 3 Release the top nut S using a 30 mm open ended spanner see fig 1 31 4 Remove the screws T from the bottom of the gas valve pipe see fig 1 32 Attention The gas valve is connected with the two pipes as shown with an O ring connection 1 5 Access to the Important Before any component is removed the boiler Hydraulic Circuits must be drained of all water Removing the D H W secondary exchanger 1 Remove the screw U see fig 1 37 2 Push the exchanger towards the rear of the boiler lift upwards and remove out of the front of the boiler 3 Before replacing the exchanger ensure that the O rings are in good condition and replace if necessary 14 B029 Removing the safety valve 1 Loosen nut V see fig 1 38
77. in burner simply press the On Off D switch L the green L E D I will also turn off precautionary measure it is recommended that the gas cock located on the bottom of the boiler be tur L ned off as well The steps marked with the symbol are necessary to carry out a swit ching program TIME CLOCK PREPARING FOR OPERATION Activate the Reset switch to reset the time switch to it s default setting activate using a pencil or similar pointed instrument Do this every time you wish to Reset the time clock to erase all switching times and the current time of day 8022 After approximately two seconds the following display appears Weekdays blinks d3134M5h10 0000 h m e o Enter minutes the hour e 0 Input time Manual switch Enter switching time Enter weekdays Summer and winter time Reset setting ENTER CURRENT TIME AND WEEKDAY Keep the key pressed down During the summer time period press the 1 key once d 05 50 Enter the hour using the h key oa h m Enter the minutes using the m key 4 22 2 Enter the day using the Day key 1 Mon 7 Release the 0 key 11 The colon now blinks once a second AM PM TIME DISPLAY If you press the h and h keys as the same time the time display swit ches into the AM
78. inal to their original positions close the cover on the grommet compartment and fasten the wire clamp in place 8 remote time clock is to be fitted disconnect the integral time clock plug from the P C B 9 Using a volt free switching time clock connect the switching wires from the time clock following points 1 7 above 101 using time clock and room thermostat these must be connected in series as per points 1 9 above Note Only a two wire type room thermostat can be used 2 11 Electrical Diagram Legend AT High Voltage P C B BT Low Voltage P C B Flame Failure L E D Insufficient Water Pressure L E D Water Temperature Indicator L E D s Overheat Thermostat Warning L E D System Reset Button Selector Knob for Operating Mode Domestic Hot Water Temp Adjustment Central Heating Temp Adjustment Wire Connector for Room Thermostat Antifreeze feature selector Connector for Total Check System Anti cycling Device Adjustment for Heating Soft light Adjustment Max Heating Temperature Adjustment On Off L E D On Off Switch Interface Wire for 5 Relay Motorised Valve Ignitor Relay Gas Valve Relay Fan Relay Circulation Pump Relay Selector TCS lt xXS lt CHMDOOZZO AC TOMmMIOD A01 Pressure Switch 02 Fan A03 Gas Valve A04 lgnitor A05 Motorised Valve A06 Circulation Pump 07 Flame Detector A08 Earth Terminal A09 Flame Detection C
79. ing the flue accessories please consult the Flue Pipe Accessories manual WJ Y T E VY m N 2 1 500 0 60 0 65 69 5 12 8023 Maximum Extension Diameter of Pipes Use ofa Restrictor Exhaust Air on the Discharge Side Exhaust Type Risk of Condensation Forming 60 100 Coaxial System 60 100 0 60 100 23 kW 27 kW 54m 46 m L lt 7 23 kW 5 m 27 kW gt 49 23 kW gt 6 5 m 27 kW 54 46m L lt 7 m 23 kW 5 m 27 kW gt 4 9 m 23 kW L gt 6 5m 27 kW Twin Pipe Systems 54 m 46m lt 7 m 23 5 m 27 kW L gt 4 9m 23 kW L gt 6 5m 27 kW 1 m 1 m L lt 7 m 23 kW 5 m 27 kW gt 4 9m 23 kW gt 5 3m 27 kW 7 L Length of Piping In calculating the lengths of the pipes the maximum length must also take into consideration the values for the exhaust air intake end terminals as well as 90 elbows for coaxial systems The C52 types must comply with the following requirements 1 discharge intake vent pipes must have the same diamet
80. ings are specified in Fig 2 5 TERMINAL POSITION mm A Directly below an open window or other opening 300 B Below gutters solid pipes or drain pipes 75 C Below eaves 200 D Below balconies or car port roof 200 From vertical drain pipes and soil pipes 75 F From internal or external corners 300 T G Above ground or below balcony level 300 P d H From a surface facing a terminal 600 From a terminal facing a terminal 1200 lt J From an opening in the car port 2 2 e g door window into dwelling 1200 f K Vertically from a terminal in the same wall 1500 L Horizontally from a terminal in the same wall 300 The boiler is designed to be connected to a coaxial flue discharge system 60 100 mm f 19 2 6 In addition it is also possible to use twin pipe split system by fitting a special adaptor to the flue discharge collar and using one of the apertures for the air vent intake located on the top part of the combustion chamber A Fig 2 7 AG 80 mm 7 4 80 mm This procedure must done as follows 1 Remove the air vent intake you want to use in th
81. ion Chamber Insulation Panel 5 Burner 6 Expansion Vessel 7 Overheat Thermostat 8 Spark Generator 9 Diverter Valve 10 Main Circuit Temperature Probe 11 Main Circuit Flow Switch 12 Diverter Valve Microswitch 13 Filter Seat 14 Drain Valve 15 Secondary Heat Exchanger 16 Safety Valve 3 bar 17 Circulation Pump with Automatic Air Release Valve 18 Gas Valve 19 Detection Electrodes 20 Ignition Electrodes 21 Fan 22 Venturi 23 Air Pressure Switch 2 2 1 2 2 INSTALLATION Reference Standards Siting the Appliance The technical information and instructions provided herein below are intended for the installer so that the unit may be installed correctly and safely The installation and initial start up of the boiler must be by a CORGI Approved Installer in compliance with the installation standards currently in effect as well as with any and all local health and safety standards i e CORGI This appliance must be installed by a competent installer in accordance with the 1984 Gas Safety installation amp use Regulations as amended The installation of this appliance must be in accordance with the relevant requirements of the 1984 Gas Safety installation amp use Regulations the Local Building Regulations the current E E Wiring Regulations the byelaws of the local water authority and in Scotland in accordance with the Building Standards Scotland Regulation and Health and Safety docum
82. ircuit A10 Flame Indicator L E D A11 Transformer A12 Filter B01 Over Heat Thermostat B02 Room Thermostat Gas Valve Modulator B05 Heating Sensor BO6 Pressure Switch for Heating Circuit BO7 Microswitch for Diverter Valve Colours Gry Grey Rd Red Blue Grn YI Yellow Green Wh White Brn Brown Wh Rd White Red 23 27 24V 12V 1 105 59 412V 24 1 2 3 4 567 8 9 10 11 12 112 4 516 7 9 to H 12 OOOOQOO a Not 9 7 5 4 3 2 tj 2 12 Water Circuit Diagram A 23 A 27 MFFI
83. irements are needed for an installation within a cup board This appliance is not suitable for outdoor installation The type C appliances in which the combustion circuit air vent intake and com bustion chamber are air tight with respect to the room in which the appliance is installed can be installed in any type of room There are no limitations with respect to ventilation and the volume of the room itself The boiler must be installed on a solid permanent wall to prevent access to the electrical parts when live through the aperture on the back frame 2 3 Overall Dimensions Legend A Central Heating Flow 3 4 B Domestic Hot Water Outlet 1 2 Gas Inlet 3 4 D Domestic Cold Water Inlet 1 2 E Central Heating Return 3 4 2 4 Clearances In order to allow for access to the interior of the boiler for maintenance purposes the boiler must be installed in compliance with the minimum clearances indicated in the dia gram below 23 27 2 5 2 6 2 7 Mounting the Appliance Electrical Connection 60 mm Fasten the boiler in place using the template and anchors supplied with the unit It is highly recommended that a spirit level be used to position the boiler so t
84. it and can be corrected by the user SHUTDOWN DUE TO THE FAILURE OF THE BURNER TO LIGHT AUTOMATICALLY This anomaly is indicated by the red L E D To reset the unit press and then release the A button At this point the electronic ignition system will attempt to light the burner again Repeat this procedure as needed If lighting failure A occurs repeatedly it is recommended that you contact one of our Authorised Service Centres SHUTDOWN DUE OVERHEATING This anomaly is signalled by the red G L E D The boiler shuts off because the safety thermostat detected that the boiler temperature has reached the temperature limit To reset the unit wait until the boiler has cooled and then press the A button If the safety thermostat shuts off the unit on a fre quent basis contact one of our Authorised Service Centres for assistance 8022 5 15 MTS Manufacturer Merloni TermoSanitari SpA Italy Commercial subsidiary MTS GB LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone 01494 755600 Fax 01494 459775 Internet http www mtsgb Itd uk E mail info 9 mtsgb Itd uk Technical service 299933949 Cod 23 99 84 1257 311 B022 bieffe recanati
85. itions with the knob on the flue test setting in order for the unit to function properly and without interruption The boiler is equipped with the following safety systems see section 3 3 for references 1 Ignition Failure This control signals an ignition failure on the burner 7 seconds after a lighting failure The L E D B will turn on to signal the shutdown status The system can be reset by pressing and releasing the button A after checking to make sure that the gas valve is open Repeat this process until the burner lights 2 Circulation Failure This control signals that the safety pressure switch on the primary circuit has not sensed a pressure of at least 1 bar within 40 seconds of the activation of the circulation pump it shuts off the boiler and lights the L E D The system can be reset after the pressure has been brought up to the proper level by using the On Off switch L 3 Overheating This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 110 C The L E D will come on to signal this shut 8023 3 9 Draining the System 4 GAS ADJUSTMENTS CATEGORY 12 3 Lower Wobbe Index 15 C 1013mbar Nominal Delivery Pressure Minimum Delivery Pressure 23 Main Burner n 13 jets 0 Consumption 15 C 1013mbar Consumption 15 C 1013mbar Gas Cock Outlet Pressure min max A 27 MFFI Main Burner
86. lation and filling are completed turn on the central heating system sect 3 4 and run it until the temperature has reached the boiler operating temperature The system must then be immediately flushed through The flushing procedure must be in line with BS 7593 1992 Code of practice for treat ment of water in domestic hot water central heating systems During this operation we highly recommend the use of a central heating flushing deter gent Fernox Superfloc or equivalent whose function is to dissolve any foreign matter that may be in the system Substances different from these could create serious problems to the pump or other components The use of an inhibitor in system such as Fernox MB 1 or equivalent is strongly recom mended to prevent corrosion sludge damaging the boiler and system Failure to carry out this procedure may invalidate the appliance warranty 3 2 3 3 3 4 Removing Front Panel Control Panel Initial Start up To remove the front panel of the casing proceed as follows 1 Remove the screw F located on the top edge of the panel 2 Lift and unhook the panel C E F O 2 ARISTON Ignition Lockout Reset Button Safety Overheat Thermostat Reset Ignition Lockout L E D Selector Knob for Summer Winter Flue Analysis Modes Low System Water Level L E D Temperature Adjustment Knob for Domestic Hot Wate
87. lve Ti Check wheather fame e FETT datedion daedrodais SHITE OF THE postioned inthe lame BOILER ACTI ATED Ch eck ihe Check the control PCB RESET Sw ITCH Restart of the fan B029 23 THERE STILL PROBLEM 2 24 8029 3 ELECTRICAL DIAGRAMS 8029 gt High Voltage P C B Low Voltage P C B Flame Failure L E D Insufficient Water Pressure L E D Water Temperature Indicator L E D s Overheat Thermostat Warning L E D System Reset Button Selector Knob for Operating Mode Domestic Hot Water Temp Adjustment Central Heating Temp Adjustment Wire Connector for Room Thermostat Antifreeze feature selector Connector for Total Check System Anti cycling Device Adjustment for Heating Soft light Adjustment Max Heating Temperature Adjustment On Off L E D On Off Switch Interface Wire for P C B s Relay Motorised Valve Ignitor Relay Gas Valve Relay Fan Relay Circulation Pump Relay Selector TCS lt lt xXxS lt CHMDOOZE AC TOmMmMIOIOAO 01 Pressure Switch 0 2 Fan AO3 2 Gas Valve 04 Ignitor 05 Motorised Valve 06 Circulation Pump 07 Flame Detector 08 Earth Terminal 09 Flame Detection Circuit 10 Flame Indicator L E D 11 Transformer 12 Filter 1 Over Heat Thermostat 02 Room Thermostat 03 Gas Valve Modulator B05 Heating Sensor BO6 Pressure Switch for
88. maximum power see table A page 11 5 To set the minimum power disconnect a supply terminal from the modu reg and adjust screw Turn the screw clockwise to increase the pressure and coun ter clockwise to decrease the pressure displayed on the pressure gauge corresponding to the minimum power see table A page 11 6 When you have completed the above operations turn off the hot water tap re connect the supply terminal to the modureg on the gas valve and replace the cap on the screw of the modureg Setting the maximum heating circuit power 7 set the maximum heating circuit power place the On Off button to position lt I gt and the summer winter switch to winter position Turn the knob of the heating thermostat clockwise to maximum 8 Remove the left hand inspection panel of the PC B and fit a small cross head screwdriver in to the right hand potentiometer Turn clockwise to increase the pressure or counter clockwise to reduce the pressure Adjust the setting to the required heating pressure value displayed on the pressure gauge as indicated in the diagrams shown in page 11 9 Turn off the boiler by placing the main switch to the Off position Setting pressure for soft ignition Disconnect the detection electrode connection from the P C B see fig 1 13 Start the boiler and during the ignition sequence adjust the centre poten tiometer until the gas pressure reads the required gas pressure as
89. mp 1 Remove the electrical connection 5 see fig 1 43 2 Release the nuts A6 and remove the pump see fig 1 44 Removing the pressure gauge 1 Remove the inspection panel see fig 1 6 1 7 2 Release coupling A7 using a 14 mm open ended spanner see fig 1 45 3 Push the pressure gauge through the control panel from the rear see fig 1 46 8029 Removing expansion vessel 1 Remove nut A8 away from the expansion vessel see fig 1 47 2 Remove nut 9 see fig 1 48 3 Remove expansion vessel see fig 1 49 Removing the overheat thermostat 1 Remove the electrical connection from the overheat thermostat see fig 1 50 2 Then remove the thermostat from the pipe by releasing its securing clip Removing the heating temperature sensor N T C 1 Remove the electrical connector by pulling off the ther mostat connections and unscrewing the sensor probe with a 14 mm open ended spanner see fig 1 57 B029 IZ 18 1 6 Access to Control System Checking fuse 1 Remove the inspection panel see fig 1 6 1 7 2 Remove fuse see fig 1 52 pratt ai M LE Removing the time clock 1 Remove the inspection panel see fig 1 6 1 7
90. n connect TYPICAL JUNCTION BOX room stat terminal block on the G Ur 246 226 LE 9 p 6 v G YUN d4 UOJ 9JeMO 9 6 0 19 21 15 reverse of the boiler control panel see section 2 10 to 9 10 on the junction box eyeuog Auoudu S uejs s 444 22 51192 1 5 054252 51 99 6 1 001 05 dS 27 HAN 22 dIAUNS 191094 Lr lt e 5 392 rcu T6360B ROOM THERMOSTAT 9 6 10 017 9 291 202 10 9 1 yur 660 9 6 3 201 20 00 00 93 521001 0 Jepuiulluy 028 9 10087 caMy 149 9 SIDUE 9 0 1 XU 4106 909 Gzy 510 8 Yur 2001 8669 LS 42 c O N O gt oO O 0 gt V O O O between 4 5 junction box If a room thermostat is not requied on Zone 2 insert a link between 6 8 on the junction box 240V MAINS INPUT 3 AMP 8023 23 iring Connection to Ariston Sis Tt 555 A 5 6 2 uo
91. n the burner 7 seconds after a lighting failure The L E D B will turn on to signal the shutdown status The system can be reset by pressing and releasing the button A after checking to make sure that the gas valve is open Repeat this process until the burner lights Circulation Failure This control signals that the safety pressure switch on the primary circuit has not sensed a pressure of at least 1 bar within 40 seconds of the activation of the circulation pump it shuts off the boiler and lights the L E D The system can be reset after the pressure has been brought up to the proper level by using the On Off switch L 3 Overheating This control shuts off the boiler in the case where the primary circuit reaches a tempera ture in excess of 110 C The L E D will come on to signal this shut off status After the system has been allowed to cool the system can be reset by pressing the button A The boiler is provided with a device that should the temperature of the water for the heating system fall to below 3 C is activated until a temperature of 55 C is reached still for heating purposes This device can only be activated with a perfectly operating boiler The pressure of the system is sufficient The boiler is well supplied electronically The gas is supplied 5 Limescale Build up This is an indirect control actuated through the regulation of the temperature in the primary heat exchanger on th
92. nd have registration number Both should be recorded in your boiler Logbook You can check your installer is CORGI registered by calling CORGI direct on 01256 372300 WA Dear Customer Thank you for choosing an ARISTON combination boiler We guarantee that your boiler is a reliable and technically sound product This User s Manual provides detailed instructions and recommen dations for proper use Hemember to keep this manual in a safe place for future reference Your local MTS Servicing Centre is at your complete disposal for all requirements MTS GB Limited The guarantee on this appliances is valid for 12 months from the first day of installation Repairs to the electric hydraulic or gas circuits may be carried out only by your local authorised MTS Servicing Centre Every attempt has been made to avoid errors of any kind in this User s Manual the Management invites customers to inform of any inaccuracies which they may find This will help to improve our service 8022 8022 TECHNICAL INFORMATION GENERAL DATA Heating input max Heating input min Heating output max Heating output min Efficiency at Maximum Thermal Capacity see installation manual Efficiency at Reduced Thermal Capacity CENTRAL HEATING Operating Temperature max Operating Temperature min Maximum Heating Pressure Minimum Heating Pressure Built in expansion vessel Total capacity DOMESTIC HOT WATER Maximum Temperature
93. ners 300 G Above ground or below balcony level 300 H From a surface facing a terminal 600 From a terminal facing a terminal 1200 J From an opening in the car port e g door window into dwelling 1200 K Vertically from a terminal in the same wall 1500 L Horizontally from a terminal in the same wall 300 The boiler is designed to be connected to a coaxial flue discharge system 60 100 mm In addition it is also possible to use a twin pipe split system by fitting a special adaptor to the flue discharge collar and using one of the apertures for the air vent intake located on the top part of the combustion chamber A 023 11 This procedure must done as follows 1 Remove the air vent intake you want to use in the area indicated in Fig 2 8 by breaking the perforated ring 2 Use a tool to grasp the lid and remove it completely 3 Clean any burrs or sharp edges with a knife or an appropriate tool In Fig 2 10 below several different types of flue systems are shown For additional information regard
94. ng the burner and the injectors Removing the combustion cover Remove the side panels of sealed chamber fig 1 10 Remove the screws F of the burner see fig 1 11 Remove the burner see fig 1 12 Remove the injectors using a No 7 socket spanner Replace in reverse order B029 Removing the electrodes 7 Remove rubber gasket see fig 1 13 2 Disconnect ignition leads by pulling downward see fig 1 14 3 To remove the flame sensor disconnect the cable at its only connection point close to the P C B see fig 1 15 5 Remove screw using a Philips No 2 star tip screwdriver see fig 1 16 6 Slide the electrode gently downward see fig 1 17 To replace repeat the steps in reverse order paying particular attention to the following a Centre the electrode in the positioning hole carefully otherwise the electrode may break b Check that the cables have been connected correctly Check that the rubber gasket covers the cable electrode connection point completely 6 B029 Removing the main heat 1 Drain the boiler of water exchanger 2 Release the two connection nuts and return pipes see fig 7 78 3 Pull it straight out see fig 1 19 connecting the exchanger
95. nt the domestic hot water system must be drained as follows Turn off the general water valve for the household plumbing system Turn on all the hot and cold water taps Empty the remaining water from the lowest points in the system where present Methane Gas Liquid Butane Gas Liquid Propane Gas 1mbar 10 197 column of water The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid The maximum pressure of the gas to the burner will be equal to the nominal delivery pressure minus the head loss within the gas valve 21 4 1 Changing the Ti ype of The boiler can be converted to use either methane natural gas G20 or Gas LPG G30 G31 by an Authorised Service Centre The operations that must be performed are the following 1 Replace the jets on the main burner see table in section 4 2 Adjust the maximum and minimum thermal capacity values for the boiler see table in section 4 3 Replace the gas rating plate 4 Adjust the maximum thermal power setting Methane Gas Liquid Butane Gas Liquid Propane Gas G30 G31 Recommended Soft Light Pressure mbar 5 Adjust the soft light feature 6 Adjust the ignition delay feature for the heating system can be set from 010 2 mins 5 It is recommended that the following checks be made on the boiler least once a year 1 Check the seals for the water connections replacement of any faulty seal
96. nufacturer will not be held liable for damage caused by the failure to earth the appliance properly or by anomalies in the supply of power Make sure that the residential electrical system is adequate for the maximum power absorbed by the unit which is indicated on the rating plate In addition check that the section of cabling is appropriate for the power absorbed by the boiler The boiler operates with alternating current as indicated in the technical data table 1 2 where the maximum absorbed power is also indicated Make sure that the connections for the neutral and live wires correspond to the indications in the diagram The appliance electrical connections are situated on the reverse of the control panel See the servicing manual for further information Important In the event that the power supply cord must be changed replace it with one with the same specifications Make the connections to the terminal board located within the control panel as follows The yellow green wire should be connected to the terminal marked with the earth symbol make sure to re use the ferrule mounted on the other supply cord The blue wire should be connected to the terminal marked N The brown wire should be connected to the terminal marked Note The diagrams for the electrical system are indicated in section 2 11 Warning this appliance must be earthed External wiring to the appliance mu
97. oiler inlet connection should not be used 2 9 Water Connections A 23 MFFI A 27 MFFI Fig 2 4 Legend Central Heating Flow Domestic Hot Water Outlet C Gas Inlet D Domestic Cold Water Inlet E Central Heating Return Safety Valve Central Heating Detailed recommendations are given in BS 6798 1987 and BS 5449 1 1990 the following notes are given for general guidance Pipe Work Copper tubing to BS EN 1057 1996 is recommended for water pipes Jointing should be either with capillary soldered or compression fittings Where possible pipes should have a gradient to ensure air is carried naturally to air release points and water flows naturally to drain taps The appliance has a built in automatic air release valve however it should be ensured as far as possible that the appliance heat exchanger is not a natural collecting point for air Except where providing useful heat pipes should be insulated to prevent heat loss and avoid freezing Particular attention should be paid to pipes passing through ventilated spaces in roofs and under floors By pass The appliance includes an automatic by pass valve which protects the main heat exchanger in case of reduced or interrupted water circulation through the heating system due to the closing of thermostatic valves or cock type valves within the system System Design This boiler is suitable only for sealed systems Drain Cocks These mus
98. p steam will not create danger or nuisance but in an easily visible position and not cause damage to electrical components and wiring The discharge must not be over an entrance or a window or any other type of 8023 9 2 9 Flue Connections 10 public access Air Release Points These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system The appliance has an integral sealed expansion vessel to accommodate the increase of water value when the system is heated It can accept up to 7 1 5 gal of expansion water If the heating circuit has an unusually high water content calculate the total expansion and add an additional sealed expansion vessel with adequate capacity Mains Water Feed Central Heating There must be no direct connection to the mains water supply even through a non return valve without the approval of the Local Water Authority Filling A temporary method for initially filling the system and replacing lost water during servicing in accordance with Water Supply Byelaw 14 must be provided Domestic Water The domestic water must be in accordance with the relevant recommendation of BS 5546 1990 Copper tubing to BS EN 1057 1996 is recommended for water carrying pipe work and must be used for pipe work carrying drinking water Residual Head of the Boiler 700
99. pply Inspect the entire installation including the gas meter test for soundness and purge all as described in BS 6891 1988 Open the gas cock supplied with the connection kit to the appliance and check the gas connector on the appliance for leaks When the installation and filling are completed turn on the central heating 17 system sect 3 4 run it until the temperature has reached the boiler operating temperature The system must then be immediately flushed through The flushing procedure must be in line with BS 7593 1992 Code of practice for treatment of water in domestic hot water central heating systems During this operation we highly recommend the use of a central heating flushing detergent Fernox Superfloc or equivalent whose function is to dissolve any foreign matter that may be in the system Substances different from these could create serious problems to the pump or other components The use of an inhibitor in system such as Fernox MB 1 or equivalent is strongly recommended to prevent corrosion sludge damaging the boiler and system Failure to carry out this procedure may invalidate the appliance warranty 3 2 Removing the To remove the front panel of the casing proceed as follows Front Panel 1 Remove the screw F located on the top edge of the panel 2 Lift and unhook the panel 3 3 Control Panel G ARISTON A Ignition Lockout Reset Button Safety Overheat
100. r Heating System Thermometer Safety Overheat Thermostat Intervention L E D Adjustment Knob for Heating Temperature On Off L E D On Off Switch System Pressure Gauge Warning the flue analysis mode must only be selected by a qualified service engineer The checks to be run before initial start up are as follows 1 Make sure that the screw on the automatic air valve has been loosened when the system is full If the water pressure in the system is below 1 bar bring it up to the appropriate level Check to see whether the gas cock is closed Make sure that the electrical connection has been made properly and that the earth wire is connected to an efficient earthing system Supply power to the boiler by pressing the On Off switch L the L E D I will turn on turn the selector knob C to the winter setting This will start the circula tion pump After 7 seconds the boiler will signal a shut down due to failure ignition Leave the boiler as it is until all of the air has been bled from the lines Loosen cap on the head of the pump to eliminate air pockets Repeat the procedure for bleeding the radiators of air Open the taps for a brief period Check the system pressure and if it has dropped open the filling loop again to bring the pressure back up to 1 bar Check the exhaust flue for the fumes produced by combustion Make sure that all gate valves are open Turn on the gas cock and che
101. rt circuit The life of individual components vary and they will need servicing or replacing as and when faults develop The fault finding sequence chart in chapter 2 will help to locate which component is the cause of any malfunction and instructions for removal inspection and replacement of the individual parts are given in the following pages All testing and maintenance operations on the boiler require the control panel to be lowered This will also require the removal of the casing To dismantle the front part of the casing proceed as follows 7 Remove screw A see fig 1 1 2 Lift the front panel up and forward see fig 7 2 Removing the side panels 7 Remove the screws 2 Pull the panel away from the boiler then lift the panel up and away from the boiler see fig 1 2 To lower control panel 1 Remove the screws B 2 Push the two side panels outward slightly fig 1 5 3 Rotate the control panel forward and down To access the areas where the adjustment and control devices are located simply remove the plugs by pressing from the inside unscrew the screws C and remove the bottom part of the instrument panel rotating it upwards G ARISTON B029 1 3 Access to the Combustion Chamber Removing the sealed chamber frontal cover Removi
102. s 2 Check the gas seals replacement of any faulty gas seals 3 Visual check of the entire unit 4 Visual check of the combustion process and cleaning of the burners if needed If called for by check no 3 dismantling and cleaning of the combustion chamber 6 If called for by check no 4 dismantling and cleaning of the injectors 7 Visual check of the primary heat exchanger check for overheating in the blade assembly clean the exhaust fan if needed Adjustment of the flow rate of the gas flow rate for lighting partial load and full load 9 Check of the heating safety systems Safety device for maximum temperature safety device for maximum pressure 10 Check of the gas safety systems safety device for lack of gas or flame detection electrode safety device for gas cock 11 Check of the electrical connection make sure it complies with the instructions in the manual 12 Check of domestic hot water production efficiency delivery rate and tem perature 13 Check of the general performance of the unit 14 General check of the discharge ventilation of the combustion by products 5 22 B023 MISCELLANEOUS 6 4 ee EN SE 9 RT 6 7 uo peseg l e lt a DL l lt I l t I E Remove internal time clock plug from the the P C B the
103. sec PO W ERTO THE PUM P 1 Check to see if pump Is stuck 2 Replace circulation pump 1 Check wiring 2 Check replace wire to PCB 3 Replace power supply PCB 4 Replace control PCB 5 Check micro switch when hot water is requested B029 21 DO ES THE FAN COMEON E YES gt 1 Resetthe boiler gt 1 Check replace differential pressure switch for pump SA FETY DEVICE che CBS eck reolace PCB wire ACTIVATED YES 4 Check replace power supply PCB 5 Check replace control PCB 1 Check replace air INTERNAL 1 wiring SA FETY DEVICE eck whether reset FO R PCB YES button isstuck gt ACTIVA 3 Check replace flame detection electrode 1 Check replace wiring 2 Check reolace PCB wire 3 Check replace power IS THERE PO W ER s pply PCB gt THE FAN 4 Check replace control PCB YES 5 Check replace air pressure switch 1 Replace fan 22 B029 1 Check flue discharge 2 Check venturi amp small pipes EN EN 52 4 replace air press switc SW ITCH ACTIVA TED NO 5 Check replace PCB wire 6 Check replace power PCB 7 Check replace control PCB Check replace igniter plugs Check wiring ARE THE Check starter FUM ES DISCHA RGED Check small wire CO RRECTLY Check power 5 Check control ee of gasto g
104. snutdowns Detection electrodes are defective Check gas settings and regulation Check electrical circuit for flame detection 7 Safety thermostatistriggered repeatedly Faulty contacts ntc heating sensors Defective poorly calibrated safety thermostat Presence of air in the primary water circuit W hen the cold water tap isturned off the boiler comeson Drop in pressure in the water mains resulting in water hammering 9 Temperature of radiators not satisfactory Check ntc heating sensor Check by pass 1 Check gas settings and regulation 8029 2 2 Fault Finding Using Total Check System 1 diagnostic state opark ignition state Boiler functioning normally Lockout Boiler thermostat satisfied Room thermostat clock no demand or selector in summer setting Faulty ventilation system b Air pressure switch stuck in N O position Faulty reset switch Bl Faulty main circuit flow switch Fautyovereattnemosa G Faulty exhaust fumes sensor Faulty heating sensor N T C Faulty D H W sensor N T C Pump fed Main flow switch closed Air pressure switch N O Flame detected Water at required temperature selector in sum Room thermostat clock no demand or mer setting Auto diagnostics faulty D H W exch
105. st be carried out by a qualified technician and be in accordance with the current I E E Regulations and applicable local regulations The EuroCombi range of boilers are supplied for connection to a 230 50 Hz supply The supply must be fused at 3 A The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance by the use of a fused double pole isolator having a contact separation of at least 3 mm in all poles or alternatively by means of a 3 A fused three pin plug and unswitched shuttered socket outlet both complying with BS 1363 The point of connection to the electricity supply must be readily accessible and adjacent to the appliance unless the appliance is installed in a bathroom when this must be sited outside the bathroom 27 Gas Connection The local gas region contractor connects the gas meter to the service pipe If the gas supply for the boiler serves other appliances ensure that an adequate supply is available both to the boiler and the other appliances when they are in use at the same time Pipe work must be of an adequate size Pipes of a smaller size than the boiler inlet connection should not be used 8 B023 2 9 Water Connections A 23 MFFI A 27 MFFI Fig 2 4 Legend A Central Heating Flow B Domestic Hot Water Outlet C Gas Inlet D Domestic Cold Water Inlet E Central Heating Return Safety Valve Central Heating Detailed recommendations
106. stem Remove the panels of the case and lower the control panel see point 3 2 for further information Open the central heating flow and return cocks supplied with the connection kit Unscrew the cap on the automatic air release valve one full turn and leave open per manently Close all air release valves on the central heating system Gradually open valve s at the filling point filling loop connection to the central heat ing system until water is heard to flow do not open fully Open each air release tap starting with the lower point and close it only when clear water free of air is visible Purge the air from the pump by unscrewing anticlockwise the pump plug and also manually rotate the pump shaft in the direction indicated by the pump label to ensure the pump is free Close the pump plug Continue filling the system until at least 1 bar registers on the pressure gauge Inspect the system for water soundness and remedy any leaks discovered Filling of the D H W System Close all hot water draw off taps Open the cold water inlet cock supplied with the connection kit Open slowly each draw off tap and close it only when clear water free of bubbles is visible Gas Supply Inspect the entire installation including the gas meter test for soundness and purge all as described in BS 6891 1988 Open the gas cock supplied with the connection kit to the appliance and check the gas connector on the appliance for leaks When the instal
107. t be located in accessible positions to permit the draining of the whole system The taps must be at least 15mm nominal size and manufactured in accordance with BS 2870 1980 Safety Valve Discharge The discharge should terminate facing downwards on the exterior of the building in a position where discharging possibly boiling water amp steam will not create danger or nuisance but in an easily visible position and not cause damage to electrical components and wiring The discharge must not be over an entrance or a window or any other type of 2 9 Flue Connections public access Air Release Points These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system The appliance has an integral sealed expansion vessel to accommodate the increase of water value when the system is heated It can accept up to 7 1 1 5 gal of expansion water If the heating circuit has an unusually high water content calculate the total expansion and add an additional sealed expansion vessel with adequate capacity Mains Water Feed Central Heating There must be no direct connection to the mains water supply even through a non return valve without the approval of the Local Water Authority Filling A temporary method for initially filling the system and replacing lost water during servicing in accordance with Water Supply Byelaw 14 must be provided Domestic Water The domestic water must
108. ter Seat 14 15 16 17 18 19 20 21 22 23 Drain Valve Secondary Heat Exchanger Safety Valve 3 bar Circulation Pump with Automatic Air Release Valve Gas Valve Detection Electrodes Ignition Electrodes Fan Venturi Air Pressure Switch 2 INSTALLATION 2 1 Reference Standards 2 2 Siting the Appliance The technical information and instructions provided herein below are intended for the installer so that the unit may be installed correctly and safely The installation and initial start up of the boiler must be by a CORGI Approved Installer in compliance with the installation standards currently in effect as well as with any and all local health and safety standards i e CORGI This appliance must be installed by a competent installer in accordance with the 1984 Gas Safety installation amp use Regulations as amended The installation of this appliance must be in accordance with the relevant requirements of the 1984 Gas Safety installation amp use Regulations the Local Building Regulations the current Wiring Regulations the byelaws of the local water authority and in Scotland in accordance with the Building Standards Scotland Regulation and Health and Safety document No 635 Electricity at work regs 1989 Installation should also comply with the following British Standard Codes of Practice Low pressure pipes BS 6891 1988 Boilers of rated input not exceeding 60 k
109. the boiler is controlled by a room thermostat Therefore it runs until the ambient temperature has reached the tempe rature setting on the thermostat At that point the main burner will turn off and the circulation pump will stop TURNING OFF THE BOILER Installation without a room thermostat D To turn off the heating turn the C selector knob to lt gt The boiler will still provide hot water for domestic L 9 72 ADJUSTING THE HEATING TEMPERATURE 5 economise consumption while achieving the highest level of comfort the temperature adjustment knob is designed with three different heating zones based on the temperature outside the home Rotate the knob as shown below From 5 C From 5 C to 15 C 10 PRODUCTION OF HOT WATER FOR DOMESTIC USE Turn on the power to the boiler by pressing the On Off switch With these settings the boiler is already ready for use regardless of the position of the C selector knob Turn the E knob to select the temperature for the hot water between 36 C and about 56 C depending on the flow rate of the water ADJUSTING THE TEMPERATURE OF WATER FOR DOMESTIC USE It is recommended that the temperature for the hot water should not be set to high temperatures and then mixed with cold water Setting the thermostat to a medium tem perature is preferable see figure SHUTDOWN PROCEDURE To turn off the ma
110. tions provided Improper installation may cause damage or injury to individuals ani mals and personal property for which the manufacturer will not be held liable To ensure efficient and safe operation it is recommended that the boi ler is serviced annually by a competent person If it is known or suspected that a fault exits on the appliance it must not be used until fault has been corrected by a competent person HELPFUL SUGGESTIONS To get the most out of your boiler we have provided you with some useful advice on the proper use and main tenance Periodically check the system pressure using the pres sure gauge O make sure that the pressure is between 1 0 and 1 5 bar the blue part on the gauge when the system is off and cool The warning L E D D will indicate if the pressure is below the minimum 8022 recommended value Consult your installer for checking and refilling the 4 System The outer panels of the unit s case must only be cleaned with a damp pA cloth Do not use abrasive cleaners The Control panel can be wiped with a damp or dry cloth Spray polishes must not be used on the control panel surface or knobs Care must be taken in preventing any liquid entering the appliance If the water is exceptionally hard install a water softener so that the effi ciency of the unit remains the same over time as this will consume less gas To improve comfort and take full advantage of the heat produced b
111. ventilate the room Shut the gas mains tap on the gas meter or the valve of the gas cylinder and call your Gas Supplier immediately If you are going away for a long period of time remember to shut the mains gas tap or the gas cylinder valve Always disconnect the appliance either by unplugging it from the mains or turning off the mains switch before cleaning the appliance or carrying out maintenance In the case of faults or failure switch off the appliance and turn off the gas tap Do not tamper with the appliance For repairs call your local Authorised Servicing Centre and request the use of original spare parts For in guarantee repairs contact MTS GB Limited Check the following at least once a year 1 Check the seal of water connections replacing the gaskets if necessary 2 Check the seal of the gas connections replacing the gaskets if necessary 3 Check the general condition of the appliance and of the combustion chamber visu ally 4 Visual check of the combustion clean burners if necessary 5 With reference to point 3 dismantle and clean the combustion chamber if neces 6 With reference to point 4 dismantle and clean the injectors if necessary 7 Visual check of the primary heat exchanger check for overheating of the exchangers fins clean the exhaust side of the exchanger and fan if necessary 1 2 Overall View 8 9 Regulate the gas pressure ignition pressure partial flame maximum flam
112. ving the Gas Valve 1 5 Access to the Hydraulic Circuit Removing the D H W Secondary Exchanger Removing the Safety Valve Removing the Automatic Air Vent Removing the Main Flow Circuit Switch Removing the Pump Removing the Pressure Gauge Removing the Expansion Vessel Removing the Overheat Thermostat Removing the Heating Temperature Sensor 1 6 Access to the Control System Checking the Fuses Removing the Time Clock Removing the 5 2 FAULT FINDING 2 1 Fault Finding Guide Flow chart 2 2 Fault Finding Using the Total Check System 3 ELECTRICAL DIAGRAMS 3 1 Electrical Connection 3 2 Functional Flow Connection 4 SHORT SPARE PARTS LIST Page No KR gt NNOO 12 12 13 13 13 14 14 15 15 15 16 16 17 18 23 24 25 26 B029 1 1 1 1 2 8029 SERVICING INSTRUCTIONS Replacement of Parts To Gain General Access To ensure efficient safe operation it is recommended that the boiler is servi ced annually by a competent person Before starting any servicing work ensure both the gas and electrical supplies to the boiler are isolated and the boiler is cool Before and after servicing a combustion analysis should be made via the flue sampling point please refer to the Installation Manual for further details After servicing preliminary electrical system checks must be carried out to ensure electrical safety i e polarity
113. vision If you smell gas in the room do not turn on light switches use the telephone any other object which might cause sparks Open doors and windows immediately to ventilate the room Shut the gas mains tap on the gas meter or the valve of the gas cylinder and call your Gas Supplier immediately If you are going away for a long period of time remember to shut the mains gas tap or the gas cylinder valve Always disconnect the appliance either by unplugging it from the mains or turning off the mains switch before cleaning the appliance or carrying out maintenance In the case of faults or failure switch off the appliance and turn off the gas tap Do not tamper with the appliance For repairs call your local Authorised Servicing Centre and request the use of original spare parts For in guarantee repairs contact MTS GB Limited Check the following at least once a year 1 Check the seal of water connections replacing the gaskets if necessary 2 Check the seal of the gas connections replacing the gaskets if necessary 3 Check the general condition of the appliance and of the combustion 3 chamber visually Visual check of the combustion clean burners if necessary 5 With reference to point 3 dismantle and clean the combustion chamber if necessary 6 With reference to point 4 dismantle and clean the injectors if necessary 7 Visual check of the primary heat exchanger check for overheating of the ex
114. y the boiler it is recommended that an external thermostat be installed If the boiler is not going to be used for an extended period of time turn off the supply of electricity to the D unit by pressing the On Off switch The green L E D I will turn off Then turn off the D supply of gas to the unit itself It is good practice to clean and service the appliance and central heating system every year Call an Authorised Service Centre r START UP PROCEDURE a D LIGHTING D Before starting the unit check the following The water pressure on the pressure gauge O WINTER AND SUMMER OPERATING MODES That the gas cock and the inlet for domestic water are open These models are equipped with electronic ignition which utilises contact ionisation To make the boiler operational simply press the On Off switch The green L E D I will then turn on At this point the boiler is ready for use a centralised electronic control unit will automatically light the main burner when needed If the burner does not light within the pre set safety time limit the red B L E D will light up To reset the ignition system the reset button A must be pressed Should the system fail to light a second time check to make sure that the gas cock is open If the problem persists contact one of our Authorised Service Centres for assistance 8 The boiler is fitted with a selector knob

Ariston EuroCombi A27 MFFI GC 47 116 10

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