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Ariston MicroCombi 23 MFFI Servicing Instructions

Type c boilers
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See also: Instructions for Installation and Servicing , User Manual
Servicing
Instructions
T ype C Boilers
G.C.N:
47-1 1 6-1 6
LE AVE THE SE INSTRUCTIONS
WITH THE E ND-USE R
Country of destination: GB

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Summary of Contents for Ariston MicroCombi 23 MFFI

  • Page 1: Servicing Instructions

    Servicing Instructions T ype C Boilers G.C.N: 47-1 1 6-1 6 LE AVE THE SE INSTRUCTIONS WITH THE E ND-USE R Country of destination: GB...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SERVICING INSTRUCTIONS EPLACEMENT OF ARTS ENERAL CCESS - Removing the front panel - Removing the sealed chamber front cover - Removing the side panels CCESS TO THE OMBUSTION HAMBER - Removing the combustion cover - Removing the burner and jets - Removing the electrodes - Removing the heat exchanger - Removing the air pressure switch...

  • Page 3: Replacement Of Parts

    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 4: Removing The Sealed Chamber

    1.2.2 Removing the sealed chamber front cover 1.2.3 Removing the side panels 1. Remove the screws “C” (F . 1.6); 1. Remove the four screws “D” for each side panel (F .1.8); 2. Lift the sealed chamber front cover from the locating pins 2.

  • Page 5: Access To The Combustion Chamber

    CCESS TO THE OMBUSTION HAMBER 1.3.1 Removing the combustion cover 1. Remove the screws “E” (F . 1.10); 2. Lift off the combustion cover. Fig. 1.12 1.3.3 Removing the electrodes Before carrying out this procedure, unscrew and slide the burner forward (see previous section). 1.
  • Page 6 1.3.4 Removing the main heat exchanger . 1.15 1. Drain the boiler of water; 2. Remove the overheat thermostat sensor, D.H.W. sensor and heating sensor “I” (F . 1.17); 3. Release the four connection nuts “J” connecting the exchanger to the flow and return pipes (F .

  • Page 7: Removing The Air Pressure Switch

    1.3.5 Removing the air pressure switch 1.3.6 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 . 1.20); .1.23); 2. Remove screws “M” on the top of the sealed chamber 2.

  • Page 8: Servicing And Removal Of The Gas Valve

    ERVICING AND EMOVAL OF THE ALVE Setting the minimum and the maximum power of the boiler 1.4.1 Setting the gas pressures 1. Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas. 2.
  • Page 9 Regulating the heating power for natural gas (G20) model 23 CG010A Regulating the heating power for butane gas (G30) model 23 CG011A Regulating the heating power for propane gas (G31) model 23 CG012A ABLE 2.78 2.02 Kg/h 2.00 Kg/h 1.16 0.87 Kg/h 0.85 Kg/h 28 mbar...

  • Page 10: Removing The Spark Generator

    1.4.2 Removing the spark generator 1. Disconnect ignition leads “S” by pulling upward . 1.27); 2. Remove the screw “T” (F . 1.28); 3. Remove the spark generator by pulling forward from the gas valve (F . 1.29). Soft-light Max Heating Adjustment Adjustment .

  • Page 11: Removing The Gas Valve

    1.4.3 Removing the gas valve CCESS TO THE ATER IRCUIT Important! Before removing the gas valve, ensure the gas Important! Before any component is removed, the boiler supply is turned off. must be drained of all water. 1. Disconnect all the cables from the solenoid and 1.5.1 Removing the pump pressure switch modureg;...

  • Page 12: Removing The Safety Valve

    1.5.2 Removing the safety valve 1.5.3 Removing the automatic air vent 1. Unscrew valve top “Y” (F . 1.35); 1. Disconnect the discharge pipe work from below the 2. Remove valve complete with float (F 1.36). boiler; 2. Unscrew and remove the valve “X” (F .

  • Page 13: Removing The Pump

    1.5.4 Removing the pump 1. Remove the U-clip “ Z” (F . 1.37); 2. Remove the retaining clips “A1” (F . 1.38); 3. Release the nut “C1” (F . 1.39); 4. Remove the pipe “D1” (F . 1.40); 5. Remove the screws “E1” (F .

  • Page 14: Removing The Pressure Gauge

    1.5.5 Removing the pressure gauge 1.5.6 Removing the expansion vessel 1. Remove the U-clip “F1” (F . 1.42) 1. Release nuts “G1” and remove the gas pipe (F . 1.44); 2. Remove the pressure gauge coupling (F . 1.42); 2. Release nut “H1” (F .

  • Page 15: Removing The Overheat Thermostat

    1.5.7 Removing the overheat thermostat 1.5.9 Removing the D.H.W. temperature sensor (N.T.C.) 1. Disconnect overheat thermostat electrical 1. Pull off the electrical connector and unscrew the sensor connections “J1” (F . 1.48); probe using a suitable spanner (F . 1.52). 2.

  • Page 16: Access To The Control System

    1.5.10 Removing the D.H.W. flow switch CCESS TO THE ONTROL YSTEM 1. Unplug the electrical connector “M1” (F . 1.59); Important! Isolate the electrical supply to the boiler before 2. Release the retaining clip “N1” and remove the D.H.W. accessing the control panel. flow switch.

  • Page 17: Removing The Time Clock

    1.6.2 Removing the time clock 1.6.3 Removing the P.C.B. 1. Disconnect the electrical connections “P1” from the 1. Isolate electricity; clock (F . 1.56); 2. Remove the inspection cover from the reverse of the 2. Remove screws “Q1” (F . 1.57); control panel;...

  • Page 18: Fault Finding

    FAULT FINDING It is possible to detect and correct any defect by using the standard fault AULT INDING UIDE finding diagrams described in this chapter. CHARTS...
  • Page 19 IS THE PUMP RUNNING? POWER TO THE PUMP? 1 - Check system pressure 2 - Check pump cable. 3 - Check/replace P.C.B 1 - Check that the pump is not stuck 2 - Release/replace pump...
  • Page 20 IS THE FAN RUNNING? BOILER 1 - Reset the boiler SHUTDOWN? 1 - Check/replace air INTERNAL pressure switch P.C.B. PROTECTIONS 2 - Check if reset button ACTIVATED? is jammed 3 - Check/replace flame detection electrode 1 - Check/replace connection cable POWER 2 - Check/replace P.C.B.
  • Page 21 IS THE AIR PRESSURE SWITCH ACTIVATED? CHECK P 0.55mbar P ON AIR 1 - Check/replace A.P. switch PRESSURE TEST POINT 1 - Check exhaust/air intake P 0.55mbar 2 - Check venturi & tubes 3 - Check fan efficiency/replace DOES POWER THE SPARK 1 - Check/replace cable TO SPARK...

  • Page 23: Electrical Diagrams

    EGEND ELECTRICAL = Central Heating Temperature Adjustment DIAGRAMS = Domestic Hot Water Temperature Adjustment = Soft-light Adjustment = Maximum Heating Adjustment = Time Clock Connector = On/Off Switch = Fume Sensor L.E.D. = Central Heating Selector = Ignition Failure (Lockout) L.E.D. = On/Off L.E.D.
  • Page 24 23 MFFI SE016A SF013A...

  • Page 25: Short Spare Parts List

    SHORT SPARE PARTS LIST microCombi 23 MFFI...
  • Page 27 NOTES...
  • Page 28 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.ltd.uk E-mail: info@mtsgb.ltd.uk Technical Service Hot Line: (01494) 539579...

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