Ariston ACO 35 MFFI Installation And Servicing Instructions
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Ariston ACO 35 MFFI Installation And Servicing Instructions

Ariston ACO 35 MFFI Installation And Servicing Instructions

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Installation and
Servicing
Instructions
SERIES
Type C Boilers
ACO 35 MFFI G.C.N: 47-116-35
LEAVE THESE INSTRUCTIONS
WITH THE END USER
Country of destination: GB/IE

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  • Page 1: Installation And Servicing

    Installation and Servicing Instructions SERIES Type C Boilers ACO 35 MFFI G.C.N: 47-116-35 LEAVE THESE INSTRUCTIONS WITH THE END USER Country of destination: GB/IE...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS GENERAL INFORMATION MAINTENANCE 1.1. 6.1. ENERAL NFORMATION ENERAL EMARKS 1.2. 6.2. ECHNICAL NFORMATION LEANING THE RIMARY XCHANGER 1.3. 6.3. VERALL LEANING THE ONDENSATE 6.4. PERATIONAL INSTALLATION SERVICING INSTRUCTIONS 2.1. EFERENCE TANDARDS 2.2. 7.1. ITING THE PPLIANCE EPLACEMENT OF ARTS 2.3.

  • Page 3: General Information

    The ACO 35 MFFI is a combined appliance for the production of central heating (C.H.) and domestic hot water (D.H.W.) and is For operating instructions please consult the separate Users designed for domestic use only..

  • Page 4: Technical

    1.2. ECHNICAL NFORMATION Name ACO 35 MFFI CE Certification 1312BQ4461 Flue Type Heat Input max (Domestic Hot Water) 37.2 Heat Input max/min (Central Heating) 33.3 / 7.4 Heat Output max/min (Central Heating) 29.4 / 6.5 Heat Output max/min (Domestic Hot Water) 33.3 / 7.4...

  • Page 5: Overall View

    1.3. VERALL 15 16 . 1.0 EGEND Air Release Valve 15. Secondary Heat Exchanger Main Heat Exchanger (Stainless Steel) 16. Domestic Hot Water Flow Switch Detection Electrode 17. Circulation Pump with Automatic Air Release Valve Central Heating Flow Temperature Probe 18.

  • Page 6: Installation

    2. INSTALLATION 2.2. ITING THE PPLIANCE The appliance may be installed in any room or indoor area, although particular attention is drawn to the requirements of the 2.1. EFERENCE TANDARDS current I.E.E. 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 The technical information and instructions provided herein below room containing a bath or shower, the location of the boiler in a...

  • Page 7: Overall

    2.3. 2.4. MINIMUM CLEARANCES VERALL IMENSIONS In order to allow access to the interior of the boiler for maintenance purposes, the boiler must be installed in compliance with the clearance requirements indicated in the diagram below. . 2.2 . 2.0 EGEND 2.5.

  • Page 8: Electrical

    2.6. E 2.8. LECTRICAL ONNECTION ATER ONNECTIONS The boiler operates with alternating current, as indicated in the IEW OF THE OILER ONNECTIONS technical data table (Section 1.2), where the maximum absorbed power is also indicated. Make sure that the connections for the neutral and live wires correspond to those indicated in Fig.2.3).
  • Page 9 1. Internal termination of condensate drainage pipe to AFETY ALVE ISCHARGE internal stack The discharge should terminate facing downwards on the exterior of the building in a position where discharging (possibly boiling water & steam) will not create danger or nuisance, but in an easily visible position, and not cause damage to electrical components and wiring.
  • Page 10 4. External termination of condensate drainage pipe via ELEASE OINTS condensate siphon 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.
  • Page 11 function is to dissolve any foreign matter that may be in the system; In hard water areas or where large quantities of water are in the system the treatment of the water to prevent premature scaling of the main heat exchanger is necessary. The formation of scale strongly compromises the efficiency of the thermic exchange because small areas of scale cause a high increase of the temperature of the metallic walls and...

  • Page 12: Flue

    2.9. YSTEM ONNECTING THE 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 MPORTANT exposed to outdoor air. BEFORE CONNECTING THE FLUE ENSURE THAT LITRE OF The terminal must not discharge into another room or space WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION...

  • Page 13: Fitting The C

    Warning Important The exhaust gas ducts must not be in contact with or close to Ensure that the flue is not blocked. inflammable material and must not pass through building Ensure that the flue is supported and structures or walls made of inflammable material. assembled in accordance with these When replacing an old appliance, the flue system must be instructions.
  • Page 14 Clamp Screws Seal Fig. 2.12 Should the flue require extending, the flue connections are push fit, however, one flue bracket should be used to secure each metre of flue. 2.9.2 F 5” F ITTING THE (Ø 80 / 125 H EE PAGE FOR MAXIMUM AND MINIMUM FLUE RUNS ORIZONTAL...

  • Page 15: Fitting The Coaxial Flue

    EE PAGE FOR MAXIMUM AND MINIMUM FLUE RUNS 2.9.3. F ITTING THE OAXIAL (Ø 60 / 100 V ERTICAL ONTENTS (60mm) ILICONE (60/100mm) ONICAL DAPTOR (80/125mm) ERTICAL CREWS 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.

  • Page 16: (Ø80 / 80)

    EE PAGE FOR MAXIMUM AND MINIMUM FLUE RUNS 2.9.4. F (Ø80 / 80) ITTING THE Where it is not possible to terminate the flue within the distance permitted for coaxial flues, the twin flue pipe can be used by fitting a special adaptor to the flue connector and using the aperture for the air intake located on top of the combustion chamber.
  • Page 17 Fig. 2.18 In the event that the air intake and exhaust are run to the left, it will be necessary to reduce the height of the air intake by cutting 20mm from the base of the air intake elbow (see Fig. 2.18) In the event that twin flue pipes are used, and the boiler has a side clearance of less than 60mm from the wall, it is...
  • Page 18 Fig. 2.19 RAWINGS ARE INDICATIVE OF FLUEING OPTIONS ONLY AIR INTAKE MUST NOT BE FITTED ABOVE THE EXHAUST AIR INTAKE EXHAUST AIR INTAKE Fig. 2.20...

  • Page 19: Digital

    2.10. ITTING THE ECHANICAL IGITAL LOCK The ACO MFFI boiler is supplied with a factory fitted mechanical time clock. There is a digital clock available as an optional extra (code: 706348). To fit the digital clock it is necessary to proceed as follows:- 1.

  • Page 20: Echanical Time Clock

    2.11. ETTING THE ECHANICAL LOCK 1. General layout The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A (Fig. 2.25). An override switch is located on the clock B (Fig 2.25). 2. To set the time To set the time of day, grasp the outer edge of the dial and turn slowly clockwise until the correct time is lined up with the arrow C (Fig.
  • Page 21 Changing the programmed switching times Press the “Prog” key repeatedly until the switching time you want to change is displayed. You can now enter the new data. See point “Entering the switching times”. Notes on storing switching times: If you end your entry of the switching times by pressing the “Prog”...

  • Page 22: Onnection

    2.12. CCESSORY ONNECTION IMPORTANT!! 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 remove the casing (as shown in Section 3.2 - page 39) then proceed as follows: 1.
  • Page 23 FITTING THE EXTERNAL SENSOR (code. 3318888) The external sensor is supplied with the interface PCB (Fig. 2.28). The external sensor should be sited no more than 50 m from the boiler and on an external north facing wall, between 2.5 and 3 metres above the ground.
  • Page 24 2.13. The P.C.B. is fitted with 2 fuses, on the live and the LECTRICAL IAGRAM neutral. The fuse holder contains: - 5 x 20mm “3.15A Slow” glass fuses TIMER FUSE FUSE . 2.29...
  • Page 25 Legend: CN8 = SENSOR CONNECTOR 1: Central Heating flow sensor (white) 2: Central Heating return sensor (white) - ON/OFF button 3: Not used - Multifunction display 4: DHW flow switch (grey) - Reset button 5: DHW sensor (grey) - Green LED (Indicates burner on) 6: Not used - Comfort function LED (yellow) 7: Not used...

  • Page 26: Ircuit Diagram

    2.14. W ATER IRCUIT IAGRAM . 2.30 EGEND 16 - Domestic hot water flow switch Air release valve 17 - Pressure gauge Main heat exchanger 18 - Safety valve Burner 19 - Circulation pump with automatic air release valve Air / Gas Mixer 20 - Central heating return temperature probe Gas valve...
  • Page 27 3. COMMISSIONING 3.1. NITIAL REPARATION MTS (GB) Limited support the initiative. In Sections 11 and 12 of this manual you will find the commissioning checklist (page 70) and the service interval record (Page 71), It is important the commissioning checklist is completed in the presence of your customer, they are shown how to use it, and it is signed by them.
  • Page 28 must be in line with BS7593:1992. We highly recommend the use of a flushing detergent appropriate for the metals used in the circuit. These include cleansers produced by Fernox and BetzDearborn, whose function is to dissolve any foreign matter that may be in the system;...

  • Page 29: Casing

    3.2. To remove the front casing panel, follow these steps: EMOVING THE ASING Remove the screws “A” (F 3.1); Remove the four screws from the case hooks (two at the top and two at the bottom) and rotate (F 3.2); Lift and unhook the case panel (F 3.3).
  • Page 30 3.3. ONTROL ANEL 35 MFFI (Combi) . 3.4 Description Button Description Green LED ON/OFF Button (illuminated = burner on) “COMFORT” Function Push-button Time clock Reset Button/ Selector knob for Summer/Winter Flue Test**/ scroll through Functions Menu Central Heating Temperature Adjustment Knob Menu Button Control Panel Cover Programming “+”...
  • Page 31 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 “F” (Fig. 3.4); the gas cock is closed (Fig. 3.7); the electrical connection has been carried out in the correct manner.

  • Page 32: Shown

    3.5. During operation of the boiler, while it is carrying out its normal ISPLAY ESSAGES HOWN URING operations, the left-hand display shows a series of characters that ORMAL PERATION refer to the operations indicated below: No request for heat Heating Pump overrun for heating Domestic hot water Pump overrun for domestic hot water...

  • Page 33: Arameters

    3.6. PERATING ARAMETERS The boiler has been designed to allow easy use of the operating parameters. 3.6.1 EGULATION ABLE Summary of the functions accessed when the RESET button and the menu button are pushed at the same time for 5 seconds. On the display will appear the parameters indicated in table 3A.
  • Page 34 Parameter Function Range Factory setting selects low temperature systems 00 (Low temperature) or standard systems 01 (Standard System) Temperature regulation controlled by 90 (Disabled) external sensor 91 (Enabled) Correction of heat curve translation from -20 to + 2 0 Curve incline from 0_1 to 5 _ 0 0 _ 9...
  • Page 35 Soft Light adjustment The soft light can be adjusted between the maximum power (shown on the display as “99”) and the minimum power (shown on the display as “00”). The boiler is factory set to a value which is suitable for the ignition with any type of gas. The value set expressed as a percentage, can be displayed and adjusted as indicated in Section 3.6.1 (parameter 1) .
  • Page 36 Section 3.6.1 (parameter 5). . 3.15 Boiler types Factory setting: 00 - ACO 35 MFFI (COMBI) HIS PARAMETER MUST NEVER BE ADJUSTED Secondary outlet Function E (This parameter can be modified only with the...
  • Page 37 Comfort Function (MFFI model - Combi only) C . 3.18 The boiler allows the convenience level to be increased in the output of domestic hot water by means of the “COMFORT” function. This function keeps the secondary exchanger warm during the periods in which the boiler is inactive, thereby allowing the initial water drawn to be at a higher temperature.
  • Page 38 “P 6” DAPTING THE HEAT CURVE (Only enabled when the outdoor sensor is activated) Should the external sensor be fitted it will be necessary to set the heating curve (see below) and may be necessary to adjust the parallel shift depending on the performance of the heating system used. .
  • Page 39 Fig. 3.26 External temperature (°C) With parameter P5 it is necessary to adjust the heat curve to one of WARNING those shown in Fig. 3.26. By using the programming keys If a curve is selected for an under-floor , the curve may be changed to select the required curve heating a system safety thermostat must for the system.
  • Page 40 The boiler is designed to monitor some operating variables and 3.6.2 ETTINGS ISPLAY settings by means of the display on the front control panel. Keeping, at the same time, the reset and the menu key pressed for over 10 seconds will allow access to the “readout” function of the main system variables.
  • Page 41 3.6.3 G Supply pressure check AS REGULATION CHECK 1. Loosen screw “1” (Fig. 3.31) and connect the pressure gauge connection pipe into the test point. 2. Turn the boiler on at maximum power, enabling the “test” function (press the key for 5 seconds and then press the programming keys together ensuring the dashes are at the top of the display (see Fig.

  • Page 42: Adjustment

    3.6.4 I The ignition delay can be adjusted to between 0 and 7 minutes. GNITION ELAY DJUSTMENT The delay is factory set to 2 minutes. The value set can be displayed and modified as illustrated in paragraph 3.6.1 (parameter 3). The maximum heating power can be adjusted between the 3.6.5 A DJUSTING THE...
  • Page 43 (normally the bath tap), adjust the cold water inlet valve until the correct temperature rise is achieved at the stated flow rate ( ACO 35 MFFI - ∆T@35°C = 13.5 l/min). Alternatively, you can advise the customer to restrict the water flow through each individual tap, by opening the tap and slowly closing it until the water reaches the desired temperature.
  • Page 44 3.10 The boiler is protected from malfunctioning by means of internal OILER AFETY YSTEMS checks by the P.C.B., 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 45 AILY In order to prevent sticking components, the boiler carries out a self- diagnosing test every 21 hours: the pump runs for 15 seconds and the diverter valve moves once. FROST EVICE The anti-frost function acts on the central heating flow temperature probe, independently from other regulations, when the electrical supply is turned on.
  • Page 46 5. SEQUENCE OF OPERATION ENTRAL EATING MODE Activation of the time clock and/or room thermostat starts the boiler. The letter C is shown in the display followed by the flow temperature. With the boiler in rest, the diverter valve is in the domestic hot water position, activation of the central heating changes the position of the motorised valve head, moving the diverter valve into the central heating position.

  • Page 47: Control Panel

    6. MAINTENANCE To ensure the validity of the 5 Year Guarantee, the boiler must be serviced annually by a CORGI registered gas engineer. 6.1. ENERAL EMARKS MTS (GB) Limited will write to the householder as the boiler becomes due for it’s annual service. With the letter will also be sent a ‘Service Pack’, this will include the annual maintenance checklist to be completed and signed by the CORGI registered engineer, also included in this pack may be a...

  • Page 48: Servicing Instructions

    To ensure efficient safe operation, the boiler must be serviced SERVICING INSTRUCTIONS 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 Section 3.6.3).

  • Page 49: Access To The C Chamber

    7.3. . 7.4 CCESS TO THE OMBUSTION HAMBER 7.3.1. R EMOVING THE SSEMBLY 1. Remove the three torx screws “C” (F . 7.5); 2. Loosen the nut “D“ under the gas valve (F . 7.6); 3. Disconnect electrical connections to gas valve and fan; 4.
  • Page 50 7.3.3. R . 7.7 EMOVING THE ETECTION LECTRODE 1. Remove the two torx screws “E” (F . 7.9); 2. Extract the electrode (F . 7.10); 3. Disconnect the detection electrode cable (F . 7.11). . 7.9 . 7.10 7.3.2. R EMOVING THE URNER 1.

  • Page 51: Removing The Fan

    7.3.4. R 7.3.5. R EMOVING THE GNITION LECTRODE EMOVING THE 1. Remove ther air/gas assembly see section 7.3.1; 1. Remove the earth cable from the electrode (F . 7.12); 2. Disconnect the air/gas connection unscrew the three 2. Remove the electrode cable from the spark generator screws “G“...

  • Page 52: Removing Theh

    7.3.6. R EMOVING THE XCHANGER . 7.20 ATTENTION!! When removing the heat exchanger, ensure that no water can enter the electrical box containing the PCB! 1. Drain the boiler; 2. Remove the air/gas assembly see section 7.3.1; 3. Remove the electrodes see section 7.3.3 - 7.3.4; 4.

  • Page 53: Removing Thec

    7.3.7. R . 7.24 EMOVING THE ONDENSATE TUBE 1. Unplug the clip “L” (F . 7.25); 2. Unscrew the screw “M” (F .7.26); 3. Remove the condensate tube (F . 7.27). . 7.25 . 7.26 . 7.27...

  • Page 54: Access To Theg

    7.3.8. R EMOVING THE ONDENSATE CCESS TO THE ALVE 1. Remove the condensate trap tube - see section 7.3.7; 1. Remove the casing and lower the control panel as 2. Remove the condensate trap glass (F . 7.28); instructed in Section 7.1. 3.
  • Page 55 7.4.1. R 7.4.2. R EMOVING THE ALVE EMOVING THE SPARK GENERATOR 1. Remove the air/gas assembly see section 7.3.1; 1. Disconnect the electrical connection from the spark 2. Remove the screws “O” from the bottom of the gas generator (F .

  • Page 56: Removing The

    CCESS TO THE ATER IRCUIT . 7.38 Important! Before any component is removed, the boiler must be drained of all water. 7.5.1. R D.H.W. (S EMOVING THE ECONDARY XCHANGER 1. Remove the two allen screws “Q” (F . 7.35 and 7.36); 2.

  • Page 57: Valve

    7.5.2. R 7.5.3. R EMOVING THE AFETY ALVE EMOVING THE UTOMATIC 1. Loosen the nut “R” and remove the pipe (Fig. 7.40); 1. Remove the U-clip “S” (F . 7.42); 2. Remove the valve (Fig. 7.41). 2. Remove the automatic air vent (F .

  • Page 58: Removing Thes

    7.5.4. R EMOVING THE IVERTER ALVE CTUATOR 1. Unplug the electrical connector and retaining clip “T” . 7.44); 2. Remove the diverter valve actuator (F . 7.45). . 7.47 7.5.6. R EMOVING THE 1. Unplug the electrical connection (F . 7.48); 2.

  • Page 59: Ressure Gauge

    7.5.7. R 7.5.8. R EMOVING THE ATER RESSURE WITCH EMOVING THE RESSURE AUGE 1. Disconnect the electrical connection (F . 7.50); 1. Release U-clip “W” (F . 7.53 - 7.54); 2. Loosen the nut “V” (F 7.51); 2. Ease the pressure gauge through the control panel 3.

  • Page 60: Xpansion Vessel

    7.5.9. R 7.5.10 R D.H.W. T (N.T.C.) EMOVING THE XPANSION ESSEL EMOVING THE EMPERATURE ROBE 1. Unscrew the screw “X” (F . 7.55); 1. Remove the electrical connector by pulling off and 2. Loosen nut “Y” (F . 7.56); loosening the nut “Z” (Fig. 7.58); 3.

  • Page 61: Return

    7.5.10. Removing the C.H. Flow Temperature Probe (N.T.C.) 1. Unplug the C.H. Flow temperature probe (Fig. 7.60); 2. Remove the electrical connection from the C.H. flow temperature probe (F . 7.61). . 7.63 7.5.10. Removing the Overheat Thermostat 1. Unplug the overheat thermostat (Fig. 7.64); 2.

  • Page 62: Removing The (Mffi Only )

    7.6.2. R P.C.B. EMOVING THE CCESS TO THE ONTROL YSTEM 1. Remove the inspection cover of the PCB box (F 7.6.1. C HECKING THE USES 7.66- 7.6.7); SECTION 2. Unplug all the electrical connections and loosen the 1. Remove the inspection cover of the PCB box (F .

  • Page 63: R Emoving The P

    7.6.3. 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 unscrew the four screws (F . 7.75); 3. Remove the time clock (F .
  • Page 64 FAULT FINDING It is possible to detect and correct defects by using the standard fault 8.1. AULT INDING UIDE finding diagrams described in this chapter. CHARTS HESE CHECKS ARE NOT EXHAUSTIVE...
  • Page 65 IS THE LOW WATER PRESSURE SWITCH WORKING CORRECTLY? E 02:does not close 1. Check if there is air in the system 2. Check the pressure on the water gauge and fill system to 1 bar Push the RESET button...
  • Page 67 35 MFFI SHORT SPARE PART LIST 0101 65103385 MAIN EXCHANGER 0107 65103333 BURNER 0110 65103358 ELECTRODE (IGNITION) 0111 65103359 ELECTRODE (DETECTION) 0147 61306030 GASKET D:129.4 0190 65103516 SPARK GENERATOR 0206 61314434 FAN ASSY 0401 65103413 GAS VALVE 0502 997147 MOTOR (3-WAY VALVE) 0520 998458 TEMPERATURE PROBE (D.H.W.)
  • Page 68 ANNUAL MAINTENANCE CHECKLIST Annual Maintenance Check List In order to maintain the 5 year manufacturers warranty, a similar sheet to this has been sent to the customer. It must be completed in full by a CORGI registered engineer and returned with a replaced component if requested. Note: These checks are not exhaustive, additional checks may be necessary The flue has been checked to ensure it is: Sited in accordance with the manufacturers instructions...
  • Page 69 BENCHMARK COMMISSIONING CHECKLIST...
  • Page 70 SERVICE INTERVAL RECORD...
  • Page 72 ERMS AND ONDITIONS OF UARANTEE Please read these terms and conditions which are in On the 12 month anniversary of the appliance addition to any terms and conditions detailed in this book installation, you must have it serviced to continue any or any registration card supplied with your appliance.

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