Ariston microCombi 23 MFFI Installation And Servicing Instructions
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Ariston microCombi 23 MFFI Installation And Servicing Instructions

Type c boilers g.c.n: 47-116-16 (23kw) g.c.n: 47-116-24 (27kw)
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microCombi 23/27 MFFI

Installation and Servicing

Instructions
Type C Boilers
G.C.N: 47-116-16 (23kW)
G.C.N: 47-116-24 (27kW)
LEAVE THESE INSTRUCTIONS WITH
THE END-USER
Country of destination: GB, IE

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Summary of Contents for Ariston microCombi 23 MFFI

  • Page 1: Installation And Servicing

    microCombi 23/27 MFFI Installation and Servicing Instructions Type C Boilers G.C.N: 47-116-16 (23kW) G.C.N: 47-116-24 (27kW) LEAVE THESE INSTRUCTIONS WITH THE END-USER Country of destination: GB, IE...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 6.3.1 R 1. GENERAL INFORMATION EMOVING THE . 33 OMBUSTION HAMBER 6.3.2 R EMOVING THE URNER ENERAL NSTRUCTIONS . 33 VERALL 6.3.3 R EMOVING THE . 33 LECTRODES 2. INSTALLATION 6.3.4 R EMOVING THE . 34 XCHANGER EFERENCE TANDARDS 6.3.5 R...

  • Page 3: General Information

    This manual is an integral and essential part of the product. It should be kept GENERAL with the appliance so that it can be consulted by the user and our authorised INFORMATION personnel. Please carefully read the instructions and notices about the unit contained in this manual, as they provide impor tant information regarding the safe installation, use and maintenance of the product.

  • Page 4: Overall View

    VERALL EGEND Flue connector Air intake for twin pipe flue systems Combustion chamber hood “Twin-pass” heat exchanger Domestic hot water temperature probe Combustion chamber Combustion chamber insulation panel Burner Detection electrode Ignition electrodes Gas valve Spark generator Pump pressure switch Safety valve (3 bar) Automatic By-pass D.H.W.

  • Page 5: Siting The Appliance

    “Electricity at work regulations 1989” and in the Republic of Ireland with the current edition of I.S. 813, the Local Building Regulations (IE). C.O.S.H.H. Materials used in the manufacture of this appliance are non-hazardous and no special precautions are required when servicing.

  • Page 6: Overall Dimensions

    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 chamber are air-tight with respect to the room in which the appliance is installed) can be installed in any type of room.

  • Page 7: Mounting The Appliance

    OUNTING THE PPLIANCE After removing the boiler from its packaging, remove the template from the separate box containing the connection kit. N : Pay particular attention to any test water that may spill from the appliance. Place the template in the position the appliance is to be mounted and after ensuring it is hanging squarely, use it to drill the holes for the hanging bracket and flue pipe(s) NB: For further information relating to the flue installation...

  • Page 8: Gas Connection

    at 3A and 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.
  • Page 9 Particular attention should be paid to pipes passing through ventilated spaces in roofs and under floors. 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 radiators. YSTEM ESIGN This boiler is suitable only for sealed systems.

  • Page 10: Flue

    YSTEM ONNECTIONS The provision for satisfactory flue termination must be made in accordance with BS 5440-1. The appliance must be installed so that the flue terminal is exposed to outside air. The terminal must not discharge into another room or space such as an IMPORTANT! outhouse or lean-to.
  • Page 11 ITTING THE OAXIAL ORIZONTAL (For Telscopic Instructions see below and for Vertical Flue and Twin Pipe Instructions see page 12) ONTENTS (60mm) ILICONE LBOW & E EALS NTERNAL XTERNAL LUMINIUM IPE INCLUDING ERMINAL - 60/100) METRE LAMPS CREWS EALS Once the boiler has been positioned on the wall, insert the elbow into the socket (F 2.8) and rotate to the required position.
  • Page 12 LUMINIUM IPE INCLUDING ERMINAL ELESCOPIC 60/100) LAMPS CREWS EALS The telscopic flue is suitable for use with an exact minimum X dimension of 270mm and an exact maximum X dimension 470mm. IMPORTANT!! Do not extend the telescopic flue to an X dimension of more than 470mm.

  • Page 13: Connection

    inner aluminium exhaust flue. To connect the vertical flue kit directly to the boiler, place the adaptor (see F 2.12) (supplied with vertical flue kit) onto the exhaust manifold and secure with the clamp, the vertical flue kit must then be inserted through the roof flashing, this will ensure that the correct clearance above the roof is provided as the terminal is a fixed height.
  • Page 14 To utilise the air intake it is necessary to: Remove the ‘knockout’ of the air intake by cutting it with a suitable knife (F . 2.16). Insert the elbow/flue pipe into the air intake until it stops. The twin flue pipes can be fitted with or without additional elbows and need no clamps, simply ensure that the red o- ring is inserted in the female end of the flue pipe and push the extension piece fully into the previous section of flue...
  • Page 15 . 2.19 RAWINGS ARE INDICATIVE OF FLUEING OPTIONS ONLY AIR INTAKE MUST NOT BE FITTED ABOVE THE EXHAUST AIR INTAKE EXHAUST AIR INTAKE 2.20...
  • Page 16 23 MFFI ABLE Exhaust Use the Do not use the Maximum Risk of Condensation Forming Type ø 43 mm Restrictor Flue Restrictor Length Coaxial Systems Between Between NOT APPLICABLE NOT APPLICABLE ø 60/100 0.5 m - 2 m 2 m - 4 m Exhaust Use the Do not use the...

  • Page 17: Control Panel

    2.10 ONTROL ANEL EGEND A - On/Off button B - Central heating temperature adjustment C - Domestic hot water temperature adjustment D - Heating system pressure gauge E - Time clock F - Central heating selector G - Central heating L.E.D. (green) H - Flue sensor L.E.D.

  • Page 18: Room Thermostat Connection

    2.12 R To connect a room thermostat, it is necessary to: HERMOSTAT ONNECTION 2.11. 1. - Open the control panel as indicated in SECTION 2.- Remove the link “A” from the terminal block on the reverse of the control panel. 3.

  • Page 19: Electrical

    2.13 LECTRICAL YSTEM IAGRAMS CN104 CN104 CN103 CN103 CN102 CN100 CN102 CN101 CN300 CN100 CN101 . 2.22 A - Jumper: A01 - Circulation Pump Don’t move (jumper is factory set in position B) A02 - Fan Anti-cycling Device Adjustment for Heating A03 - Spark Generator/Gas Valve Supply Position A = 0 mins Position B = 2 mins...

  • Page 20: Water Circuit Diagram

    2.14 ATER IRCUIT IAGRAM . 2.23 SI016C EGEND “Twin-pass” Heat Exchanger Domestic Hot Water Temperature Probe Burner Detection Electrode Ignition Electrodes Gas Valve Pump pressure switch Safety Valve 10. D.H.W. inlet filter 11. D.H.W. Flow Switch 12. Automatic By-pass 13. Pressure Gauge 14.

  • Page 21: Commissioning

    COMMISSIONING MTS (GB) Limited support the initiative. Within the information pack NITIAL REPARATION you will find a copy of the logbook. It is important that this is completed in the presence of your customer, they are shown how to use it, and it is signed by them.

  • Page 22: Initial Start - Up

    HE CHECKS TO BE RUN BEFORE INITIAL START UP ARE AS FOLLOWS NITIAL TART 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 1.5 bar, bring it up to the appropriate level;...

  • Page 23: Combustion Analysis

    The flue connector has two apertures, readings can be taken for OMBUSTION NALYSIS the temperature of the combustion by-products and of the combustion air, as well as of the concentrations of O and CO etc. To access these intakes it is necessary to unscrew the front screw and remove the metal plate with sealing gasket.

  • Page 24: Draining The System

    the boiler is powered electrically; the gas is turned on. 6 - E XHAUST ISCHARGE NOMALY HUTDOWN The boiler is fitted with safety devices, which in the event of defective discharge of exhaust products, automatically interrupts the gas supply, thereby shutting off the boiler. The shutdown of the boiler is temporary and is indicated by the illumination of the yellow L.E.D.

  • Page 25: Instructing The Endu

    8. Check the appearance of the gas flame to assess the adequacy of the combustion air supply. 9. If external controls have been disconnected, reconnect and test. 10. Refit boiler casing. 3.10 1. Hand over the copy of the End User Instructions supplied with the appliance, NSTRUCTING together with these instructions, and explain how to use the timeclock and room thermostat if fitted.

  • Page 26: Gas Adjustments

    GAS ADJUSTMENTS Model CATEGORY II2H3+ Methane Gas Liquid Butane Gas Liquid Propane Gas 23 MFFI Lower Wobbe Index (15°C;1013mbar) MJ/m 45.67 80.58 80.58 27 MFFI Nominal Delivery Pressure mbar Minimum Delivery Pressure mbar 23 MFFI Main Burner: n. 12 jets (ø) 1.30 0.77 0.77...

  • Page 27: Adjusting The

    DJUSTING THE RESSURES IGMA point of the gas valve “D”. Disconnect the compensation pipe “D1” either from the gas valve or from the sealed chamber. 4. Push the On/Off button to “ON” position -green light- and ensure that the hot water temperature control knob is set to maximum. Turn on the boiler by running a hot water tap.
  • Page 28 DJUSTING THE ALVE ONEYWELL Setting the minimum and the maximum power of the boiler 1. Check that the supply pressure and dynamic pressure to the gas valve is a minimum of 20 mbar for natural gas. 2. To do this, loosen the screw “A”. Fit the pipe of the pressure gauge to the inlet pressure connection of the gas valve “B”...
  • Page 29 ABLE 2.78 2.02 Kg/h 2.00 Kg/h 1.16 0.87 Kg/h 0.85 Kg/h 28 mbar 37 mbar 11.0 27.5 mbar 35.5 mbar 6.2 mbar 7.3 mbar 12 x 0.77 12 x 0.77 Regulating the heating power for natural gas (G20) CG010A Regulating the heating power for butane gas (G30) CG011A...

  • Page 30: Maintenance

    Regulating the heating power for propane gas (G31) MAINTENANCE It is recommended that the following inspections be carried out on the boiler at least once a year: 1 - Check the seals for the water connections; replace any faulty seals. 2 - Check the gas seals;...

  • Page 31: Servicing Instructions

    2. The control panel moves downward and when pulled forward, SERVICING INSTRUCTIONS rotates on two lateral hinges; the panel stays in a semi- horizontal position, which allows access to the inner parts of To ensure efficient safe operation, it is recommended that the the boiler (F .

  • Page 32: Removing The Sealed

    6.2.2 Removing the sealed chamber front cover 6.2.3 Removing the side panels 1. Remove the screws “C” (F 1. Remove the four screws “D” for each side panel (F . 6.6); .6.8); 2. Lift the sealed chamber front cover from the locating pins (F 2.

  • Page 33: Access To The Combustion Chamber

    CCESS TO THE OMBUSTION HAMBER 6.3.1 Removing the combustion cover 1. Remove the screws “E” (F . 6.10); 2. Lift off the combustion cover. Fig. 6.12 6.3.3 Removing the electrodes Before carrying out this procedure, unscrew and slide the burner forward (see previous section). 1.

  • Page 34: Removing The Main Heat Exchanger

    6.3.4 Removing the main heat exchanger . 6.15 1. Drain the boiler of water; 2. Remove the overheat thermostat sensor, D.H.W. sensor and heating sensor “I” (F . 6.17); 3. Release the four connection nuts “J” connecting the exchanger to the flow and return pipes (F .

  • Page 35: Removing The Air Pressure Switch

    6.3.5 Removing the air pressure switch 6.3.6 Removing the fan 1. Disconnect the electrical connections “K” and silicone 1. Disconnect electrical connections “N” and silicone pipe “O” pipes “L” from their connection points (F . 6.20); .6.23); 2. Remove screws “M” on the top of the sealed chamber (F 2.

  • Page 36: Access To The Gas Valve

    CCESS TO THE ALVE 6.4.1. Removing the spark generator (SIT SIGMA Gas 6.4.2. Removing the spark generator (HONEYWELL Valve) Gas Valve) 1. Disconnect ignition leads “S” by pulling upward 1. Disconnect ignition leads “S” by pulling upward . 6.27 . 6.27 2.

  • Page 37: Removing The Gas Valve (Sit Sigma)

    6.4.3 Removing the gas valve (SIT SIGMA) 6.4.4 Removing the gas valve (HONEYWELL) Important! Before removing the gas valve, ensure the gas Important! Before removing the gas valve, ensure the gas supply is turned off. supply is turned off. 1. Disconnect all the cables from the solenoid and 1.

  • Page 38: Ccess To The 6.5.1 Removing The Pump Pressure Switch

    6.5.3 Removing the automatic air vent CCESS TO THE ATER IRCUIT 1. Unscrew valve top “Y” (F . 6.35); 2. Remove valve complete with float (F 6.36). Important! Before any component is removed, the boiler must be drained of all water. 6.5.1 Removing the pump pressure switch 1.

  • Page 39: Removing The Pump

    6.5.4 Removing the pump 1. Remove the U-clip “ Z” (F . 6.37); 2. Remove the retaining clip “A1” (F . 6.38); 3. Release the nut “C1” (F . 6.39); 4. Remove the pipe “D1” (F . 6.40); 5. Remove the screws “E1” (F .

  • Page 40: Removing The Pressure Gauge

    6.5.5 Removing the pressure gauge 6.5.6 Removing the expansion vessel 1. Remove the U-clip “F1” (F 1. Release nuts “G1” and remove the gas pipe (F . 6.42) . 6.44); 2. Remove the pressure gauge coupling (F 2. Release nut “H1” (F .

  • Page 41: Removing The Overheat Thermostat

    6.5.7 Removing the overheat thermostat 6.5.9 Removing the D.H.W. temperature sensor (N.T.C.) 1. Disconnect the overheat ther mostat electrical 1. Pull off the electrical connector and unscrew the sensor connections “J1” (F . 6.48); 2. Then remove the thermostat from its mounting by probe using a suitable spanner (F .

  • Page 42: Access To The Control

    6.5.10 Removing the D.H.W. flow switch CCESS TO THE ONTROL YSTEM 1. Unplug the electrical connector “M1” (F . 6.53); Important! Isolate the electrical supply to the boiler before 2. Release nut “N1” (F . 6.53a); accessing the control panel. 3.

  • Page 43: Removing The Time Clock

    6.6.2 Removing the time clock 6.6.3 Removing the P.C.B. 1. Disconnect the electrical connections “P1” from the 1. Isolate electricity; 2. Remove the inspection cover from the reverse of the clock (F . 6.56); 2. Remove screws “Q1” (F . 6.57); control panel;...
  • Page 44 These fault finding guides are not exhaustive. However, it is possible to FAULT FINDING detect and correct many defects by using the standard fault finding diagrams described in this chapter, ensure these guides are carried out in the set order. AULT INDING UIDE...

  • Page 49: Short Spare Parts List

    SHORT SPARE PARTS LIST microCombi 23/27 MFFI...
  • Page 50 G.C. part ARISTON Description Part No. E61 468 Expansion vessel 998616 164 282 Gasket 3/8" 573521 164 229 Gasket 1/2" 573528 Safety valve (1/4" 3 bar) 998447 164 261 Gasket 1/4" 569390 Pump pressure switch 995903 Return group 996047 E61 490...
  • Page 51 NOTES...
  • Page 52 *Calculated at 70% maximum output Merloni TermoSanitari SpA - Italy Manufacturer: Commercial subsidiary: MTS (GB) LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone: (01494) 755600 Fax: (01494) 459775 Internet: http://www.ariston.co.uk E-mail: info@uk.mtsgroup.com Technical Service Hot Line: (01494) 539579...
  • Page 53 End User Manual microCombi 23 MFFI microCombi 27 MFFI Leave These Instructions With the End User Country of destination: GB / IE...
  • Page 54 Dear Customer, Thank you for choosing an ARISTON boiler. We guarantee that your boiler is a reliable and technically sound product. This manual provides detailed instructions and recommendations for proper installation, use and maintenance. Remember to keep this manual in a safe place for future reference i.e.

  • Page 55: Technical Information

    1. G ENERAL NFORMATION MTS (GB) Limited support the initiative. Your installer will give you, and show you how to use, a Log Book 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.

  • Page 56: Control Panel

    ONTROL ANEL FR019A EGEND A - On/Off button B - Central heating temperature adjustment C - Domestic hot water temperature adjustment D - Heating system pressure gauge E - Time clock F - Central heating selector G - Central heating L.E.D. (green) H - Flue sensor L.E.D.
  • Page 57 RACTICAL TIPS - If the water is very hard, it is recommended that a water softener or in-line scale reducer be added to the system so as to reduce the formation of limescale in the boiler exchangers. This will ensure that the efficiency of the unit remains the same over time, reducing gas consumption and maintenance costs.

  • Page 58: Useful Information And Troubleshooting

    3. USEFUL INFORMATION OILER SHUTDOWN SITUATIONS AND TROUBLESHOOTING The boiler is equipped with safety devices that intervene in certain situations and shut it off. Most of these situations are communicated by means of the L.E.D.s and at times the user may be able to remedy them. HUTDOWN DUE TO IGNITION FAILURE In the event that the automatic ignition of the burner has failed, the red L.E.D.

  • Page 59: Time Clock

    : the time clock is for Central Heating control only. 6. TIME CLOCK The time clock is provided with 96 switches, called riders, each of which covers a time interval of 15 minutes (four per hour). When a rider is switched from the inside (off setting) to the outside of the clock border (on setting), the circuit is closed (switch on) for a period of 15 minutes and then the boiler starts if the room thermostat (if installed) or the heating thermostat require heat (heating function on).
  • Page 60 Merloni TermoSanitari SpA - Italy Manufacturer: Commercial subsidiary: MTS (GB) LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone: (01494) 755600 Fax: (01494) 459775 Internet: www.ariston.co.uk E-mail: info@uk.mtsgroup.com Technical Service Hot Line: (01494) 539579...
  • Page 61 SPARE PARTS EXPLODED VIEW WALL-HUNG GAS BOILERS Model microCombi 23 MFFI Edition 4 Current from Serial No:- 2320209500001 to -------------------...
  • Page 62 25 26 27 28 icro ombi 209500001 - 2 -...
  • Page 63 5393 5492 8589 998077 O-ring gasket 8064 Spring (by-pass pipe) 573528 Gasket 1/2" 999104 Pipe (D.H.W. outlet) 996049 Flow group (twin pass) 998447 Safety valve (1/4" 3 Bar) 569390 Gasket 1/4" 995903 Low water pressure switch 998611 Union (hot water outlet) 573530 Lock nut 1/2"...
  • Page 64 999397 Fan 998640 Panel (insulation - rear) 995893 Panel (combustion chamber - L.H. side) 998458 Temperature probe 9 Exchanger (twin pass) 998639 Panel (insulation - side) 996158 Burner 12 ramp (natural gas) 569443 Silicone seal 573325 Rivet 3576 Compensation tube 996159 Pipe (cold water inlet) 996072 D.H.W.
  • Page 65 PART. NOTIFICATION OF CHANGES Spares listed below are not interchangeable with those in Ed.1, Ed.2 and Ed.3 995393 - Frame support - replaces code 999594 from serial number: 2320209500001 995492 - Pivot - replaces code 998569 from serial number: 2320209500001 998589 - By-pass pipe - replaces code 999923 from serial number: 2320209500001 998064 - Spring (by-pass pipe)

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