Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions
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Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions

Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions

Microcondens series, type c boilers
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See also: User Manual
Installation and
Servicing Instructions
SERIES
Type C Boilers
G.C.N: 47-116-23
41-116-08
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB

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  • Page 1 Installation and Servicing Instructions SERIES Type C Boilers G.C.N: 47-116-23 41-116-08 LEAVE THESE INSTRUCTIONS WITH THE END-USER Country of destination: GB...

  • Page 2: Table Of Contents

    OILER AFETY YSTEMS AULT INDING UIDE HARTS 3.9. OMBUSTION NALYSIS SHORT SPARES PARTS LIST 3.10. RAINING 8.1. ecoCOMBI 27 MFFI 8.2. ecoSYSTEM 27 RFFI ZONE VALVES TECHNICAL INFORMATION MAINTENANCE 5.1. ENERAL EMARKS 5.2. LEANING THE RIMARY XCHANGER 5.3. LEANING THE ONDENSATE 5.4.

  • Page 3: Control Panel.

    This manual is an integral and essential part of the product. It should be kept with the 1. GENERAL appliance so that it can be consulted by the user and our authorised personnel. INFORMATION 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.

  • Page 4: Overall View

    1.2. VERALL 27 MFFI 27 RFFI 13 14 15 16 17 18 19 . 1.0 EGEND Flue connector Air release valve Pump pressure switch Central Heating flow temperature probe Mixer Ignition and detection electrode Silencer Central Heating return temperature probe 10.

  • Page 5: Installation

    2. INSTALLATION The technical information and instructions provided herein below are intended for the installer so that the unit may be installed correctly and safely. 2.1. EFERENCE TANDARDS 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..
  • Page 6 2.3. VERALL IMENSIONS 27 MFFI . 2.0 27 RFFI 8 88 EGEND 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”) F = Condensate discharge .

  • Page 7: Mounting The

    2.5. M Fasten the boiler in place using the template and anchors supplied with the unit. It is OUNTING THE highly recommended that a spirit level be used to position the boiler so that it is PPLIANCE perfectly level. For additional information, please consult the instructions contained in the connection kit and the flue kit.
  • Page 8 2.8. IEW OF THE OILER ONNECTIONS ATER ONNECTIONS 27 MFFI 27 RFFI . 2.4 Legend: A = Central Heating Flow E = Central Heating Return B = Domestic Hot Water Outlet H = Condensate discharge C = Gas Inlet I = Safety valve discharge D = Domestic Cold Water Inlet J = Drain valve Central Heating...
  • Page 9 i) Connecting in to an internal soil stack (at least 450 mm above the invert of the stack). A trap giving a water seal of at least 75 mm must be incorporated into the pipe run , there also must be an air break upstream of the trap. ii) Connecting into the waste system of the building such as a washing machine or sink.

  • Page 10: Flue Connections

    2.9. YSTEM ONNECTIONS 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-to. It is important that the position of the terminal allows a free passage of air across it at all times.

  • Page 11: Accessoryc

    . 2.7 2.10. CCESSORY IMPORTANT!! ONNECTION Before carrying out any repairs to the appliance always ensure that the external power supply has been isolated. The boiler will remain live even when the ON/OFF knob is in the “O”(off) position. In order to gain access to the external control connections, it is first necessary to lower the control panel (as shown in Section 3.2) then proceed as follows: 1.

  • Page 12: Electrical Diagram

    2.11. The P.C.B. is fitted with 2 fuses, on the live and the neutral. LECTRICAL IAGRAM The fuse holder contains: - 5 x 20mm “3.15A Slow” glass fuses 7 8 9 10 11 121314 15 16 7 8 9 10 11 121314 15 16 NTC2 NTC3 NTC1...
  • Page 13 This is the factory configuration. It is recommended that this set-up not be changed, unless under the following particular circumstances: JUMPER 3: if the contact is closed, the Secondary Output (flying clamp connected to connection C7; positions 1-9) controls a LPG valve (optional). JUMPER 4: if the contact is closed, the continuous operation of the pump is selected.
  • Page 14 C1 = FAN “Hall” sensor power supply 12V (red) “Hall” sensor neutral (blue) Not used Start of coil (black) “Hall” sensor input (white) End of coil (brown) C2 = POWER SUPPLY Earth (yellow/green) Earth (yellow/green) Not connected Neutral (blue) Not connected Live (brown) C3 = CONNECTION TO ROOMSTAT Input - 1...
  • Page 15 2.12. W ATER IRCUIT IAGRAMS 27 MFFI EGEND Heating flow temperature probe 14 - Drain valve Air release valve 15 - Domestic hot water flow switch Pump pressure switch 16 - Motorised valve Ignition/detection electrode 17 - Automatic By-pass Injector 18 - Circulation pump with automatic air release valve 19 -...
  • Page 16 27 RFFI Legend: Heating flow temperature probe 14 - Filling loop (integral to Jig Kit) Air release valve 15 - Indirect cylinder expansion vessel Ignition/detection electrode 16 - Expansion relief valve Injector 17 - Drain valve 18 - Automatic by-pass Silencer 19 - Circulation pump with automatic air release valve...

  • Page 17: Commissioning

    3. COMMISSIONING Preliminary electrical system checks to ensure electrical safety must be carried out by a 3.1. NITIAL REPARATION competent person i.e. polarity, earth continuity, resistance to earth and short circuit. ILLING THE EATING YSTEM Remove the panels of the case and lower the control panel (see section 3.2. for further information).
  • Page 18 3.3. ONTROL ANEL 27 MFFI 27 RFFI A. Selector Knob for ON/OFF-Summer-Winter B. Domestic Hot Water Temperature Adjustment Knob C. Central Heating Temperature Adjustment Knob D. Time Clock (Optional for ecoSYSTEM) E. Heating System Pressure Gauge Programming “+” key G. Programming “-” key H.

  • Page 19: Nitial Tart

    3.4. 1. Make sure that: NITIAL TART the cap of the automatic air release valve is loosened; the system pressure is at least 1 bar on the pressure gauge; the gas cock is closed; the electrical connection has been carried out in the correct manner. To allow the air to escape from the system, proceed as follows: turn on the On/off knob “A”...

  • Page 20: Operatingp

    3.5. During operation of the boiler, while it is carrying out its normal operations, the left-hand ISPLAY ESSAGES display shows a series of characters that refer to the operations indicated below: HOWN URING - - Diagnostics phase (precedes the other operations) ORMAL PERATION No request for heat...
  • Page 21 VERRUN The pump overrun may be varied (after the burner has been turned off). To access this function, it is necessary to press the reset button for over 5 seconds and then press it repeatedly until the character “A A ” appears on the left-hand display. The following modes are available: 0 0 1 1 1 minute of pump overrun...
  • Page 22 Adapting the heat curve “d” set” (Only enabled when an outdoor sensor is installed) To adapt the heat curve to the system requirements, set parameter “d” in order to shift the curve in parallel, so that the flow temperature calculated is changed, along with the ambient temperature.

  • Page 23: Comfort Key

    3.6.2 The boiler is designed to monitor some operating variables and settings by means of the ETTINGS ISPLAY display on the front control panel. Keeping the reset key pressed for over 10 seconds allows access to the “readout” function of the main system variables. By pressing the button repeatedly after that, it is possible to read the following information in sequence: Value read on right-hand display Indication on the...

  • Page 24: Gas Regulation

    3.6.4 G AS REGULATION CHECK . 3.11 . 3.12 Supply pressure check 1. Loosen screw “1” (Fig. 3.12) and insert the pressure gauge connection pipe into Supply pressure the pipe tap. 2. Turn the boiler on at maximum power, enabling the “flue sweep” function (press the G20 methane 17-25 mbar Comfort key “K”...

  • Page 25: Ignition Delay

    3.6.5 I GNITION ELAY DJUSTMENT The ignition delay can be adjusted to between 0 and 15 minutes. The delay is factory set to 2 minutes. The value set can be displayed as illustrated in paragraph 3.6.2. To access the potentiometer “C” (Fig. 3.14), open the control panel as illustrated in paragraph 3.2 and open up the service flap (Fig.

  • Page 26: Gas Changeover

    The boiler operation can be changed over from methane gas (G20) to Liquid Gas 3.7 Gas Changeover (G30-G31) or vice versa, an operation that must be performed by an Authorised Service Centre. The operations to carry out are the following: 1.

  • Page 27: Boiler Safety

    3.8. The boiler is protected from malfunctioning by means of internal checks by the P.C.B., OILER AFETY YSTEMS which brings the boiler to a stop if necessary. In the event of the boiler being shut off in this manner, a code appears on the display which refers to the type of shut-off and the reason behind it.

  • Page 28: Draining

    pump turns on (heating system circulation). If the temperature goes below 2°C, the boiler turns on at the minimum power and remains on until the return temperature is over 10°C. - Outdoor sensor installed: the pump turns on if the external temperature goes below -3°C, it turns off when the external temperatures raises above -1°C.

  • Page 29: Zone Valves

    4. ZONE VALVES The boiler is capable of managing a heating system that uses zone valves. The electrical connection of these valves is carried out by means of the appropriate terminal board (indicated in the “E ” section). LECTRICAL ONNECTION By way of example, two possible types of systems would be: System with 2 valves with independent regulation of the zones (day and night).

  • Page 30: Maintenance

    5. MAINTENANCE 5.1. ENERAL EMARKS It is recommended that the following inspections be carried out on the boiler at least once a year: Check the seals in the water group and, if necessary, replace the gaskets and restore the seal to perfect working order. Check the seals in the gas group and, if necessary, replace the gaskets and restore the seal to perfect working order.

  • Page 31: Servicing Instructions

    To ensure efficient safe operation, it is recommended that the boiler is SERVICING serviced annually by a competent person. INSTRUCTIONS 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).

  • Page 32: Removing The 6.3. Access To The

    6.2.1. R 6.3. EMOVING THE ANELS CCESS TO THE OMBUSTION HAMBER 1. Remove the screws “C” (F . 6.4); 2. Pull each panel away from the boiler, then lift the Removing the sealed chamber front cover panel up and away from the boiler. 1.
  • Page 33 6.3.1. R EMOVING THE . 6.9 1. Disconnect the electrical connector “E” (F . 6.7); 2. Disconnect the compensation tube “F” (F . 6.8); 2. Unscrew the three screws “G” (F . 6.9); 3. Pull the fan away from the mixing tube (F .
  • Page 34 6.3.2. R EMOVING THE URNER With the fan removed (see previous section); 1. Loosen nut “I” (F . 6.12); 2. Remove nuts “J” (F . 6.13); 3. Remove mixing tube (F . 6.14); 4. Slide the burner from its housing (F .
  • Page 35 6.3.5. R EMOVING THE XCHANGER 1. Remove the two nuts “N” (F . 6.21+6.22); 2. Pull off the ignition cable (F . 6.23); 3. Loosen the two nuts “O” (F . 6.24); 4. Unscrew the two screws “P” (F . 6.25); 5.
  • Page 36 . 6.24 . 6.25 . 6.27 . 6.28 . 6.26...
  • Page 37 6.3.6. R 6.3.7. R EMOVING THE ONDENSATE OLLECTOR EMOVING THE ONDENSATE 1. Open the clamp and remove the condensate trap 1. Open the clamp and remove the condensate trap connection pipe “R” (F . 6.29); connection pipe (F . 6.29+6.32); 2.
  • Page 38 Fig. 6.35 6.3.8. R EMOVING THE NJECTOR 1. Remove mixing pipe (F . 6.12+6.13); 2. Remove the fan, unscrew the screws “T” (F 6.36+6.37); 3. Unscrew the injector “U” using a suitable screwdriver . 6.38); 4. Remove the injector (F .

  • Page 39: Ccess To The 6.5.1. Removing The

    CCESS TO THE ALVE 6.4.1. R EMOVING THE ALVE 1. Disconnect the electrical connection “V” from the gas valve (F . 6.40); 2. Release the top nut “W” (F . 6.41); 3. Remove the screws “X” from the bottom of the gas valve pipe (F .

  • Page 40: Econdary

    6.5.2. R CCESS TO THE ATER IRCUIT EMOVING THE AFETY ALVE 27 MFFI) OMBI Important! Before any component is removed, the boiler 1. Remove the U-clip “Z” (Fig. 6.47); must be drained of all water. 2. Unscrew and remove the valve (Fig. 6.48). 6.5.1.
  • Page 41 6.5.2. R 6.5.2. R EMOVING THE AFETY ALVE EMOVING THE UTOMATIC 27 RFFI) 27 MFFI) YSTEM OMBI 1. Loosen union “A1” (Fig. 6.49); 1. Remove the U-clip “A2” (F . 6.51); 2. Unscrew and remove the valve (Fig. 6.50). 2. Unscrew valve (F .
  • Page 42 6.5.3. R 6.5.4. R EMOVING THE UTOMATIC EMOVING THE RESSURE WITCH 27 RFFI) 27 MFFI) YSTEM OMBI 1. Unscrew valve “A3” (F . 6.54); 1. Remove the electrical connections “A4” (F . 6.56); 2. Remove (F . 6.55). 2. Unscrew and remove (F .
  • Page 43 6.5.4. R 6.5.5. R EMOVING THE RESSURE WITCH EMOVING THE IVERTER ALVE CTUATOR 27 RFFI) YSTEM 1. Unplug the electrical connector “A6” (F . 6.60); 2. Release the retaining clip “A7” and remove the diverter 1. Remove the electrical connections “A5” (F .
  • Page 44 6.5.6. R D.H.W. F EMOVING THE WITCH 1. Unplug the electrical connector “B1” (F . 6.65); 2. Unscrew the four screws “B2” (F . 6.66); 3. Remove the D.H.W. flow switch (F . 6.67). . 6.63 . 6.65 . 6.64 .
  • Page 45 6.5.7. R 27 MFFI) EMOVING THE OMBI 1. Unplug the electrical connection “B3” (F . 6.68); 2. Unscew the four scews “B4” (F . 6.69); 3. Remove the pump (F . 6.70 - 6.71). . 6.70 . 6.68 . 6.71 .
  • Page 46 6.5.7. R 27 RFFI) EMOVING THE YSTEM 1. Unplug the electrical connection “B5” (F . 6.72); 2. Remove the U-clip “B6” (F . 6.73); 3. Remove the slide plate “B7” (F . 6.74); 4. Unscew the screw “B8” under the boiler (F .
  • Page 47 6.5.8. R 6.5.8. R EMOVING THE RESSURE AUGE EMOVING THE RESSURE AUGE 27 MFFI) 27 RFFI) OMBI YSTEM 1. Release U-clip “C1” (F . 6.78 - 6.79); 1. Ease the pressure gauge through the control panel 2. Ease the pressure gauge through the control panel from the rear (F .

  • Page 48: Removing The (Mffi Only )

    6.5.9. R 6.5.10 R D.H.W. T EMOVING THE XPANSION ESSEL EMOVING THE EMPERATURE (N.T.C.) (MFFI ROBE ONLY 1. Loosen nut “C2” (F . 6.85); 2. Loosen nut “C3” (F . 6.86); 1. Remove the electrical connector “C4” by pulling off 3.
  • Page 49 6.5.11. Removing the C.H. Flow Temperature 6.5.12. R C.H. R EMOVING THE ETURN EMPERATURE Probe (N.T.C.) (N.T.C.) ROBE 1. Remove the C.H. flow temperature probe “C6” by 1. Remove the C.H. return temperature probe “C8” by pulling off (Fig. 6.90); pulling off (Fig.

  • Page 50: Removing The (Mffi Only )

    6.6.2. R P.C.B. CCESS TO THE ONTROL YSTEM EMOVING THE 1. Remove the inspection cover on the reverse of the 6.6.1. C HECKING THE USES control panel (F . 6.94); 2. Unplug all the electrical connections (F . 6.96); 1. Remove the inspection cover on the reverse of the 3.
  • Page 51 6.6.3. R EMOVING THE LOCK 1. Open the control panel (see the paragraph “Removing the P.C.B.s”); 2. Unplug the electrical connection from the time clock and unscews the four scews (F . 6.103); 3. remove the time clock (F . 6.104). .

  • Page 52: Fault Finding

    FAULT FINDING 7.1. AULT INDING UIDE It is possible to detect and correct any defect by using the standard fault finding diagrams described in this chapter. CHARTS Model 27 MFFI MAKE SURE THAT: 1. There is sufficient water in the system 2.
  • Page 53 Model 27 RFFI System MAKE SURE THAT: 1. There is sufficient water in the system 2. The gas is turned on 3. The electrical supply is turned on TURN THE ON/OFF KNOB TO WINTER OR SUMMER POSITION IS THE 1. Check the fuses DISPLAY ON? 2.
  • Page 54 Model 27 MFFI/27RFFI System IS THE PUMP RUNNING? POWER TO THE PUMP? 1. Check pump cable 2. Check/replace main P.C.B. THE PUMP PRESSURE SWITCH WORKING CORRECTLY? E01: does not close 1. Check if there is air in the system 2. Check the main circuit flow switch operation 3.
  • Page 55 Model 27 MFFI/27RFFI System IS THE FAN DOES CODE RUNNING? A33 APPEAR? 1. Check the fan cable 2. Replace the fan 3. Replace the main P.C.B. Replace the main P.C.B. 1. Check/replace ignition IGNITION electrode SPARKS ARE GENERATED 2. Check ignition cable REGULARLY? 3.

  • Page 56: Short Spares Parts List

    8. S ecoCOMBI 27 MFFI HORT PARES 22 23 35 36 37 MODEL CHARACTERISTICS SERIAL NO. REF. VALIDITY ECOCOMBI 27 MFFI METHANE 2320224700001 ECOCOMBI 27 MFFI 2320224700001...

  • Page 57: Condensate Trap

    27 MFFI G.C. part ARISTON Description Part No. Expansion vessel 990683 990658 Condensate trap (upper) 990695 'O' Ring (condensate trap) 990659 Condensate trap (lower) 990686 Temperature probe (C.H. - T335D) + clips (18) 573727 Drain valve 995903 Low water pressure switch...
  • Page 58 ecoSYSTEM 27 RFFI 30 31 36 37 38 MODEL CHARACTERISTICS SERIAL NO. REF. VALIDITY ECOSYSTEM 27 RFFI METHANE 2320224700001 ECOSYSTEM 27 RFFI 2320224700001...
  • Page 59 27 RFFI G.C. part ARISTON Description Part No. Expansion vessel 990683 990664 Condensate pipe 990658 Condensate trap (upper) 990695 'O' Ring (condensate trap) 990659 Condensate trap (lower) 990686 Temperature probe (C.H.) + clips 378 814 573727 Drain valve 164 225 573520 Gasket 3/4"...

  • Page 60: Ga Connection

    9. TECHNICAL INFORMATION 27 MFFI 27 RFFI Certification 0694BM3593 0694BM3593 Category II2H3B/P II2H3B/P Thermal Capacity C.H.W. min/max 8.9/26.7 8.9/26.7 Thermal Capacity D.H.W. min/max 8.9/30 ---- Power for Hot Water Production min/max 7.8/23.6 ---- Efficiency at Nominal Thermal Capacity (30/50°C) 94.0 94.0 Efficiency at 30% of Nominal Thermal Capacity (47°C of return) 91.0...

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