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Ariston MICROCOMBI 23 MFFI, Installation And Servicing Instructions

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Ariston MICROCOMBI 23 MFFI Installation And Servicing Instructions Download Page 18

18

To connect a room thermostat, it is necessary to:

1. - Open the control panel as indicated in 

SECTION

2.11.

2.- Remove the link 

“A” from the terminal block on the reverse of the control panel.

3. - Insert the thermostat cable through the cable grommet and fasten it by means of the

cable-clamp provided.

4. - Connect the thermostat wires to the terminal block 

(Diagram A).

5.- If a remote time clock is to be fitted, disconnect the integral time clock from the P.C.B.
6. - Using a volt-free switching time clock, connect the switching wires from the time clock

following points 1-4 above 

(Diagram B).

7. - If using an external time clock and room thermostat, these must be connected in

series as points 1-7 above 

(Diagram C).

Note:

Only a low voltage room thermostat capable of volt free switching must 
be used. Factory fitted integral wiring must not be disturbed when wiring 
external controls.

2.12 R

OOM

T

HERMOSTAT

C

ONNECTION

A

FO016A

FO017A

F

IG

. 2.21

  

           

Summary of Contents for MICROCOMBI 23 MFFI

Page 1: ...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: ...ONT PANEL PAGE 31 6 2 2 REMOVING THE SEALED CHAMBER FRONT PANEL PAGE 32 6 2 3 REMOVING THE SIDE PANELS PAGE 32 6 3 ACCESS TO THE COMBUSTION CHAMBER PAGE 33 6 3 1 REMOVING THE COMBUSTION CHAMBER PAGE 3...

Page 3: ...plate and the table in section 7 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 operate...

Page 4: ...e installed and serviced correctly and safely In the United Kingdom the installation and initial start up of the boiler must be by a CORGI Registered Installer in accordance with the installation stan...

Page 5: ...iance control utilising mains electricity should be situated so that it cannot be touched by a person using the bath or shower specifically in accordance with current IEE Wiring Regulations The locati...

Page 6: ...e 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 Secondary ventilation is not...

Page 7: ...le local regulations The appliance is supplied with a fly lead already connected this must be connected to a 240v supply fused 2 6 ELECTRICAL CONNECTION FIG 2 3 After removing the boiler from its pack...

Page 8: ...uttered 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 bath...

Page 9: ...expansion vessel to accommodate the increase of water volume when the system is heated It can accept up to 6 litres 1 3 gal of expansion water If the heating circuit has an unusually high water conten...

Page 10: ...mber A suitable terminal guard is available from TOWER FLUE COMPONENTS Morley Road Tonbridge Kent TN9 1RA The minimum acceptable spacing from the terminal to obstructions and ventilation openings are...

Page 11: ...ed including the terminal this figure must now be subtracted from 860mm you now have the total amount to be cut from the plain end of the flue FIG 2 9 FIG 2 10 Cut the flue to the required length ensu...

Page 12: ...m 3X SCREWS The vertical flue kit is supplied with a specially designed weather proof terminal fitted it can be used either with a flat roof or a pitched roof see FIGS 2 12 2 13 The Vertical flue kits...

Page 13: ...fitted to prevent the passage of smoke or fire irrespective of the structural material through which the flue passes FITTING THE FLUE TWIN PIPE Where it is not possible to terminate the flue within th...

Page 14: ...p Part No 705774 and recommend that this be used in the event that the flue may not form condense When siting the twin flue pipe the air intake and exhaust terminals must terminate on the same wall th...

Page 15: ...15 EXHAUST AIR INTAKE AIR INTAKE AIR INTAKE MUST NOT BE FITTED ABOVE THE EXHAUST FIG 2 20 FIG 2 19 NOTE DRAWINGS ARE INDICATIVE OF FLUEING OPTIONS ONLY TYPE 1 TYPE 5 TYPE 4 TYPE 3 TYPE 2...

Page 16: ...d therefore no requirement for a condense collector ensure a minimum fall of 5mm per metre away from the appliance NOTE UNDER SOME CIRCUMSTANCES CONDENSE MAY FORM AT THE EXHAUST TERMINAL SPECIAL ATTEN...

Page 17: ...1 REMOVING THE FRONT PANEL B 1 2 3 4 5 A LEGEND A On Off button B Central heating temperature adjustment C Domestic hot water temperature adjustment D Heating system pressure gauge E Time clock F Cent...

Page 18: ...If a remote time clock is to be fitted disconnect the integral time clock from the P C B 6 Using a volt free switching time clock connect the switching wires from the time clock following points 1 4 a...

Page 19: ...ection Electrode A05 Main Circuit Temperature Probe A06 Domestic Hot Water Temperature Probe A07 D H W Flow switch A08 Pump Pressure Switch A09 Modulator A10 Air Pressure Switch A11 Safety Thermostat...

Page 20: ...0 D H W inlet filter 11 D H W Flow Switch 12 Automatic By pass 13 Pressure Gauge 14 Circulation Pump with Automatic Air Release Valve 15 Overheat Thermostat 16 Main Circuit Temperature Probe 17 Expans...

Page 21: ...ntinue filling the system until at least 1 5 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...

Page 22: ...bar bring it up to the appropriate level Ensure that 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 earthin...

Page 23: ...the minimum power until the boiler reaches a temperature of 33 C This device only operates if the boiler is functioning perfectly and the system pressure is sufficient 3 6 BOILER SAFETY SYSTEMS In th...

Page 24: ...porary and is indicated by the illumination of the yellow L E D H for a period of about 15 minutes Once this time period has passed and the discharge state of exhaust fumes has returned to normal the...

Page 25: ...User how to switch the appliance off quickly and indicate the position of the electric supply isolator 3 Inform the End User of the location of all drains isolating valves and air vents 4 Explain how...

Page 26: ...elivery Pressure mbar Minimum Delivery Pressure mbar 45 67 20 20 80 58 29 28 80 58 37 36 23 MFFI Main Burner n 12 jets mm Consumption 15 C 1013mbar m3 h Consumption 15 C 1013mbar Kg h Gas Burner Press...

Page 27: ...ush the Heating button and set the time clock and any external controls to the ON position green light Turn the knob of the heating thermostat clockwise to maximum 8 Remove the inspection panel of the...

Page 28: ...ssure gauge corresponding to the minimum power see TABLE A page 30 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 va...

Page 29: ...or natural gas G20 Regulating the heating power for butane gas G30 23 MFFI 2 78 20 11 0 2 0 1 16 2 02 Kg h 0 87 Kg h 27 5 mbar 6 2 mbar 28 mbar 12 x 0 77 2 00 Kg h 0 85 Kg h 35 5 mbar 7 3 mbar 37 mbar...

Page 30: ...r overheating in the blade assembly clean the exhaust fan if needed 8 Adjustment of the gas pressure gas rate and soft light partial load and full load 9 Check of the heating safety systems safety dev...

Page 31: ...inspection and replacement of the individual parts are given in the following pages 6 1 REPLACEMENT OF PARTS 6 2 TO GAIN GENERAL ACCESS All testing and maintenance operations on the boiler require th...

Page 32: ...led chamber front cover from the locating pins FIG 6 7 FIG 6 6 C C FIG 6 7 6 2 3 Removing the side panels 1 Remove the four screws D for each side panel FIG 6 8 2 Pull the panel away from the boiler a...

Page 33: ...w H FIG 6 15 4 Gently slide the electrode downward FIG 6 16 FIG 6 13 G FIG 6 14 6 3 2 Removing the burner and jets 1 Remove the screws F from the burner FIG 6 11 2 Remove the burner FIG 6 12 3 Disconn...

Page 34: ...the correct spark gap c Check that the cables have been connected correctly d Check that the rubber gasket seals the cable electrode connection point completely FIG 6 15 FIG 6 16 H 1 Drain the boiler...

Page 35: ...3 6 Removing the fan 1 Disconnect the electrical connections K and silicone pipes L from their connection points FIG 6 20 2 Remove screws M on the top of the sealed chamber FIG 6 21 3 Lift out the ai...

Page 36: ...rator by pulling forward from the gas valve FIG 6 29B FIG 6 27B FIG 6 28B S T FIG 6 29B 6 4 1 Removing the spark generator SIT SIGMA Gas Valve 1 Disconnect ignition leads S by pulling upward FIG 6 27A...

Page 37: ...B 4 Remove the screws V from the bottom of the gas valve FIG 6 31B 5 Remove the gas valve FIG 6 32B U FIG 6 30A FIG 6 31A FIG 6 32A U V V 6 4 3 Removing the gas valve SIT SIGMA Important Before removi...

Page 38: ...rom below the boiler 2 Unscrew and remove the valve X FIG 6 34 FIG 6 34 X Important Before any component is removed the boiler must be drained of all water 6 5 1 Removing the pump pressure switch 1 Re...

Page 39: ...the U clip Z FIG 6 37 2 Remove the retaining clip A1 FIG 6 38 3 Release the nut C1 FIG 6 39 4 Remove the pipe D1 FIG 6 40 5 Remove the screws E1 FIG 6 41 6 Remove the pump Z FIG 6 37 FIG 6 38 FIG 6 39...

Page 40: ...move back nut I1 FIG 6 46 4 Remove the expansion vessel FIG 6 47 6 5 5 Removing the pressure gauge 1 Remove the U clip F1 FIG 6 42 2 Remove the pressure gauge coupling FIG 6 42 3 Push the pressure gau...

Page 41: ...securing clip FIG 6 49 6 50 6 5 8 Removing the heating temperature sensor N T C 1 Pull off the electrical connector and unscrew the sensor probe using a suitable spanner FIG 6 51 FIG 6 48 FIG 6 49 6...

Page 42: ...control panel FIG 6 54 2 Remove the fuses FIG 6 55 FIG 6 54 FIG 6 55 M1 N1 O1 Important Isolate the electrical supply to the boiler before accessing the control panel 6 5 10 Removing the D H W flow sw...

Page 43: ...rews R1 FIG 6 59 5 Separate the facia panel from the rear of the control panel 7 Remove the screws S1 and remove the P C B FIG 6 60 FIG 6 59 R1 R1 R1 FIG 6 60 S1 S1 6 6 2 Removing the time clock 1 Dis...

Page 44: ...rd fault finding diagrams described in this chapter ensure these guides are carried out in the set order To ensure that the external controls do not interfere with the fault finding disconnect the wir...

Page 45: ...45...

Page 46: ...46...

Page 47: ...47...

Page 48: ...48...

Page 49: ...49 8 SHORT SPARE PARTS LIST microCombi 23 27 MFFI...

Page 50: ...569 E25 425 E61 665 E61 667 Expansion vessel Gasket 3 8 Gasket 1 2 Safety valve 1 4 3 bar Gasket 1 4 Pump pressure switch Return group Pump Pump Time clock P C B T2 MFFI P C B 27 MFFI Pressure gauge A...

Page 51: ...51 NOTES...

Page 52: ...capacity C CO2 Content O2 Content CO Content ppm Minimum Ambient Temperature C Head Loss on Water Side max T 20 C mbar Residual Head of System bar Heating Temperature max min C Domestic Hot Water Tem...

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: ...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...

Page 55: ...he 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 Consul...

Page 56: ...e that the pressure is at 1 5 bar when the system is off and cool If the pressure is below the minimum recommended value 1 bar consult your installer for checking and refilling the system an example o...

Page 57: ...water In the summer operating mode the boiler will produce only domestic hot water Press F button to select winter mode The green L E D G will illuminate ADJUSTING THE HEATING It is possible to set t...

Page 58: ...either the Central Heating flow or return Open the handle s or tap s to allow water into the Central Heating system Once the needle on the pressure gauge reaches 1 Bar close the handle s or tap s and...

Page 59: ...the minute hand be moved manually make sure all the switches i e the riders are placed on the inside of the clock border pull outward the riders for 7 00 am and 9 30 am and then all riders between the...

Page 60: ...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 www ariston co uk E mail...

Page 61: ...SPARE PARTS EXPLODED VIEW WALL HUNG GAS BOILERS Model microCombi 23 MFFI Edition 4 Current from Serial No 2320209500001 to...

Page 62: ...0 49 10 11 53 58 55 56 57 54 20 15 19 39 40 36 37 39 27 28 25 26 102 94 95 97 96 72 84 74 75 73 86 83 85 67 68 71 100 71 104 105 103 93 10 99 87 78 82 81 15 21 15 83 46 61 47 69 34 31 32 33 48 10 101...

Page 63: ...nob 33 999976 Push button 34 999595 Spring push button 35 997824 Name badge plastic 36 999599 Clock 37 995461 Control panel 38 999721 Clock cable 39 569711 Nylon bush 10mm 40 999724 P C B T2 MFFI 41 9...

Page 64: ...R H 96 998622 Electrode Ignition L H 97 998624 Detection electrode 98 998582 Fixing spring overheat thermostat 99 996065 Thermostat overheat 103 C 100 995892 Panel combustion chamber R H side 101 999...

Page 65: ...925 Earth cable sealed chamber not listed on original drawing 61 995318 Cable fan sensor replaces code 998633 from serial number 2320209500001 62 995319 Cable P C B fan not listed on original drawing...

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