Ariston ACO 27 MFFI Page 60 Installation And Servicing Instructions Download

Page: 60 / 80

7.5

CCESS TO THE

ATER

IRCUIT

7.5.1. R

EMOVING THE

D.H.W. (S

ECONDARY

) E

XCHANGER

(MFFI

ONLY

)

Remove the two allen screws “A1” (F

. 7.36);

Push the exchanger towards the rear of the boiler, lift
upwards and remove from the front of the boiler (F

7.37 - 7.38);

Before replacing the exchanger ensure that the O-rings
are in good condition and replace if necessary.

Important!

Before any component is removed, the boiler

must be drained of all water.

. 7.36

. 7.37

. 7.38

7.4.2. R

EMOVING THE SPARK GENERATOR

Disconnect the electrical connection “Y” from the spark
generator (F

. 7.34);

Remove the screws “Z” from the bottom of the spark
generator (F

. 7.35);

Remove the spark generator.

. 7.34

. 7.35

Summary of Contents for ACO 27 MFFI

Page 1: ...n GB IE Installation and Servicing Instructions Type C Boilers ACO 27 MFFIG C N 47 116 34 ACO 32 MFFIG C N 47 116 35 ACO 27 RFFI G C N 41 116 09 ACO 32 RFFI G C N 41 116 10 LEAVE THESE INSTRUCTIONS WITH THE END USER SERIES ...

Page 2: ...ES 48 5 SEQUENCE OF OPERATION 51 5 1 CENTRAL HEATING MODE 51 5 2 DOMESTIC HOT WATER MODE 51 6 MAINTENANCE 52 6 1 GENERAL REMARKS 52 6 2 CLEANING THE PRIMARY EXCHANGER 52 6 3 CLEANING THE CONDENSATE TRAP 52 6 4 OPERATIONAL TEST 52 7 SERVICING INSTRUCTIONS 53 7 1 REPLACEMENT OF PARTS 53 7 2 TO GAIN GENERAL ACCESS 53 7 3 ACCESS TO THE COMBUSTION CHAMBER 54 7 3 1 REMOVING THE FAN 54 7 3 2 REMOVING THE...

Page 3: ... or other hazardous materials have been used in the fabrication of this product MTS recommends the use of protective clothing when installing and working on the appliance i e gloves Before connecting the appliance check that the information shown on the data plate and the table in Section 1 2 page 4 comply with the electric water and gas mains of the property You will find the data plate on the re...

Page 4: ...approx max min C Specific Flow Rate 10 minutes DT 30 C l min D H W Flow Rate DT 25 C l min D H W Flow Rate DT 35 C l min D H W Minimum Flow Rate l min Pressure of Domestic Hot Water max min bar Domestic Hot Water Nominal Pressure Natural Gas G20 mbar Consumption at Nominal Capacity G20 m3 h Gas Consumption after 10 Minutes m3 Gas Electrical Supply V Hz Power Consumption W Minimum Ambient Temperatu...

Page 5: ...mestic Hot Water Temperature approx max min C Specific Flow Rate 10 minutes DT 30 C l min D H W Flow Rate DT 25 C l min D H W Flow Rate DT 35 C l min D H W Minimum Flow Rate l min Pressure of Domestic Hot Water max min bar Domestic Hot Water Nominal Pressure Natural Gas G20 mbar Consumption at Nominal Capacity G20 m3 h Gas Consumption after 10 Minutes m3 Gas Electrical Supply V Hz Power Consumptio...

Page 6: ...discharge 16 Condensate trap inspection cap 17 Drain valve 18 Domestic Hot Water flow switch 19 Circulation pump with automatic air release valve 20 Condensate trap 21 Diverter valve 22 Condensate trap tube 23 Central Heating return temperature probe 24 Expansion vessel 25 Air pressure switch 26 Combustion analysis test point 1 3 OVERALL VIEW 9 8 1 3 5 7 10 11 12 13 14 15 16 19 21 24 25 6 4 26 20 ...

Page 7: ...BS 5449 1990 Forced circulation hot water systems BS 6798 2000 Installation of gas fired hot water boilers of rated input not exceeding 70kW BS 6891 1989 Installation of low pressure gas pipe up to 28mm BS 7671 2001 IEE wiring regulations BS 4814 1990 Specification for expansion vessels BS 5482 1994 Installation of L P G I S 813 Domestic Gas Installations 2 2 SITING THE APPLIANCE The appliance may...

Page 8: ...low 2 4 MINIMUM CLEARANCES LEGEND A Central Heating Flow 3 4 22mm Copper Tail B Domestic Hot Water Outlet 1 2 15 mm Copper Tail C Gas Inlet 3 4 22mm Copper Tail D Domestic Cold Water Inlet 1 2 15mm Copper Tail E Central Heating Return 3 4 22mm Copper Tail F Condensate discharge SV outlet 1 2 Female BSP Not Shown 785 280 450 27 32 MFFI COMBI 27 32 MFFI RFFI FIG 2 0 FIG 2 2 27 32 RFFI SYSTEM FIG 2 1...

Page 9: ...icated Make sure that the connections for the neutral and live wires correspond to the indications in the diagram The appliance electrical connections are situated inside the electrical box see Section 2 12 IMPORTANT In the event that the power supply cable must be changed replace it with one with the same specifications Make the connections to the terminal board located within the control panel a...

Page 10: ...d or interrupted water circulation through the heating system due to the closing of thermostatic valves or cock type valves within the system SYSTEM DESIGN This boiler is suitable only for sealed systems DRAIN COCKS These must be located in accessible positions to permit the draining of the whole system The taps must be at least 15mm nominal size and manufactured in accordance with BS 2870 1980 SA...

Page 11: ...ween the cold water inlet and the central heating flow connections and incorporates a non return valve To operate the filling loop it is necessary to open both quarter turn handles once the required pressure has been achieved close both handles and disconnect the hose in accordance with water byelaws and cap off with the cap supplied NOTE The installer should ensure that there are no leaks as freq...

Page 12: ...alloys The use of a corrosion inhibitor in the system such as Fernox MB 1Copal BetzDeaborn Sentinel X100 System Inhibitor is recommended to prevent corrosion sludge damaging the boiler and system If anti freeze substances are to be used in the system check carefully that they are compatible with the aluminium In particular DO NOT USE ordinary ETHYLENE GLYCOL since it is corrosive in relation to al...

Page 13: ...ixed by vertical flue terminal FLUE SYSTEM 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 ...

Page 14: ...ws supplied Fig 2 12 secure the elbow to the boiler The 1 metre horizontal flue kit 3318073 supplied is suitable for an exact X dimension of 815mm Measure the distance from the face of the external wall to the face of the flue elbow X Fig 2 9 this figure must now be subtracted from 815mm you now have the total amount to be cut from the plain end of the flue Draw a circle around the outer flue and ...

Page 15: ...p and screws provided To fit extensions or elbows it is first necessary to ensure that the lip seal is fitted correctly into the inner flue once verified it is simply necessary to push them together no clamps are necessary to secure the flue components Before proceeding to fit the flue ensure that the maximum flue length has not been exceeded See the tables on Page 19 and that all elbows and bends...

Page 16: ...nifold and secure with the clamp fit the vertical adaptor onto the vertical starter kit note there is no need to use a clamp to secure this as it is a push fit connection 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 Should extensions be required they are available in 1 ...

Page 17: ...iting the twin flue pipe the air intake and exhaust terminals must terminate on the same wall the centres of the terminals must be a minimum of 280 mm apart and the air intake must not be sited above the exhaust terminal refer to Fig 2 20 The air intake pipe can be run horizontally however the terminal and the final 1 metre of flue must be installed either horizontally or with a slight fall away f...

Page 18: ...iameter hole for the flue pipe this should be ø10 cm this will then allow for easier assembly of the air intake elbow and the tube outside the wall see Fig 2 19 Fig 2 19 Fig 2 20 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 ...

Page 19: ...de of the building There are some different types of flue systems shown on Page 20 For additional information regarding the flue accessories please consult the Flue Pipe Accessories manual Coaxial Systems Twin Pipe Systems Exhaust Type Type 1 Type 1 Types 2 3 Type 4 Type 5 Maximum Extension Exhaust Air m 4 Horizontal 10 Horizontal 4 Vertical 10 Vertical 24 Air Intake Exhaust Equal Lengths 1 48 Air...

Page 20: ...ptional extra code 706348 To fit the digital clock it is necessary to proceed as follows 1 Remove the outer casing 2 Open the control panel see Section 2 22 3 Unplug the electrical connection from the PCB and unscrew the four screws Fig 2 26 4 Remove the time clock Fig 2 27 5 Connect the wires supplied with the clock to the digital time clock as shown in Fig 2 28 6 Reassemble in reverse order NOTE...

Page 21: ...code 706348 To fit the clock it is necessary to proceed as follows 1 Remove the outer casing 2 Open the control panel see Section 2 22 3 Unplug the electrical connection from the PCB and unscrew the four screws Fig 2 26 4 Remove the time clock Fig 2 27 5 Connect the wires supplied with the clock to the digital time clock as shown in Fig 2 28 6 Reassemble in reverse order 3 2 1 G B R 5 4 3 2 1 G B ...

Page 22: ...n the central heating off permanently 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 1 0 1 0 1 11 1 1 21 2 13 13 1 41 4 1 51 5 1 6 1 6 1 7 1 7 1 8 1 8 19 19 2 0 2 0 2 1 2 1 22 22 23 23 24 24 9 9 6 6 12 12 I A C B Fig 2 30 P r o g h m Day Manual switch Summer and winter time setting Reset Enter weekday s Enter the hours Week days flash Enter minutes Enter switching times Imput time Operating the time switch T...

Page 23: ...g instruction required for the current time You may need to manually select the desired switching state with the key Thereafter as the unit encounters further switching instructions in the memory in real time it will correctly activate all subsequent switching instructions Manual Override Switch With the you can change the current setting at any time The switching program already entered is not al...

Page 24: ...ng SP CN 9 Room Thermostat TA CN 11 Time clock CN 6 Interface PCB FIG 2 33 CONNECTION OF ROOM THERMOSTAT OR EXTERNAL TIME CLOCK a Insert the thermostat cable through the cable grommet and fasten it by means of the cable clamp provided b Connect the thermostat wires to the terminal block CN9 Fig 2 32 Diagram A c If a remote time clock is to be fitted supply 240V from the same spur as the boiler for...

Page 25: ... see Fig 2 33 To connect between the interface PCB and the external sensor it will be necessary to use 2x 0 5mm2 cable connected to the two terminals on the external sensor and to Terminal B Fig 2 33 on the interface PCB Instructions on the activation and setting of the outdoor sensor are detailed on pages 41 and 42 Parameter P activates the external sensor Parameter P6 modifies the thermal curve ...

Page 26: ...12 CN8 CN11 CN9 CN10 1 1 FLOOR ROOM TIMER FUSE FUSE N N L L 1 CN16 CN4 2 1 2 1 1 2 3 4 2 1 2 3 4 5 6 7 8 9 10 11 12 1 MV Az Bl Mr Rs R N Mr Mr Nr Nr Nr Bn Bn Gr Gr Gr Gr Gr Gr Bn Bn Bl Bl Bl Bl Rs Bn Mr Nr CN1 CN12 CN5 7 8 9 10 1112 FS PA TA TS NTC1 NTC2 NTC3 CN8 CN11 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 CN9 CN10 CN5 CN1 CN2 CN3 CN6 CI AC WFS VG O P C L K E F A B H I D N M FIG 2 31 ...

Page 27: ...all sensor power supply 12V red 4 Hall sensor input white 5 Hall sensor neutral blue 6 Not used CN2 FLAME SENSOR CN3 Earth CN4 POWER SUPPLY 1 Live brown 2 Neutral blue CN5 EQUIPMENT CONNECTIONS 1 Gas valve neutral blue 2 Gas valve live brown 3 Not used 4 Pump V1 live red 5 Pump V2 live black 6 Pump ON OFF live brown 7 Pump neutral blue 8 3 way valve C H red black 9 3 way valve D H W brown 10 3 way...

Page 28: ...s valve 9 Pressure gauge 10 Safety valve 11 Secondary heat exchanger 12 Domestic hot water temperature probe 13 Drain valve 14 Domestic hot water flow switch 15 Motorised valve 16 Automatic By pass 17 Circulation pump with automatic air release valve 18 Expansion vessel 19 Central heating return temperature probe 20 Air pressure switch A Central Heating Flow B DHW Outlet C Gas Inlet D Cold Water I...

Page 29: ...e probe 7 Condensate Trap 8 Gas valve 9 Pressure gauge 10 Safety valve 11 Drain valve 12 Automatic By pass 13 Circulation pump with automatic air release valve 14 Expansion vessel 15 Central heating return temperature probe 16 Air pressure switch A Central Heating Flow C Gas Inlet E Central Heating Return FIG 2 33 27 32 RFFI System ...

Page 30: ...crewing the pump plug and also manually rotate the pump shaft in the direction indicated by the pump label to ensure the pump is free IMPORTANT OPEN THE MANUAL AIR VENT AND ENSURE THAT THE PRIMARY EXCHANGER IS FREE OF AIR See FIG 3 1A Close the pump plug Continue filling the system until at least 1 bar registers on the pressure gauge Inspect the system for water soundness and remedy any leaks disc...

Page 31: ... appropriate corrosion inhibitor Any treatment of water by additives in the system for frost protection or for corrosion inhibition has to be absolutely suitable for all the metals used in the circuit including the aluminium alloys If anti freeze substances are to be used in the system check carefully that they are compatible with the aluminium In particular DO NOT USE ordinary ETHYLENE GLYCOL sin...

Page 32: ...nt casing panel follow these steps 1 Remove the screws A FIG 3 1 2 Remove the four screws from case hooks two at the top and two at the bottom and rotate anti clockwise FIG 3 2 3 Lift and unhook the case panel FIG 3 3 FIG 3 2 FIG 3 3 FIG 3 1 A A ...

Page 33: ... Push button Reset Button Flue Test scroll through Functions Menu Menu Switch Programming key Programming key Description A Green LED illuminated burner on B Time clock C Selector knob for Summer Winter Central Heating Temperature Adjustment Knob D Control Panel Cover E Domestic Hot Water Temperature Adjustment Knob F Heating System Pressure Gauge G COMFORT Function L E D H Red LED illuminated boi...

Page 34: ...ion ON OFF Switch Not used Reset Button Flue Test scroll through Functions Menu Menu Switch Programming key Programming key Description A Green LED illuminated burner on B Time clock Optional Extra C Central Heating Temperature Adjustment Knob D Control Panel Cover F Heating System Pressure Gauge G Heating only L E D H Red LED illuminated boiler lockout I Multi function Display 27 32 RFFI System ...

Page 35: ...bar 2 Fill the boiler condensate trap with water by pouring 1 2 a litre of water into the exhaust flue connector see Section 2 9 Connecting the Flue N B In the event of a prolonged period of system shutdown the condensate trap should be filled before any renewed use A shortage of water in the trap could temporarily lead to a small leakage of fumes into the air 3 Ensure that the flue is fitted corr...

Page 36: ...ers that refer to the operations indicated below 0 0 No request for heat C C Heating c c Pump overrun for heating d d Domestic hot water h h Pump overrun for domestic hot water The right hand display two digit shows in CENTRAL HEATING mode temperature of the Central Heating system flow in DOMESTIC HOT WATER mode temperature of the Domestic Hot Water MFFI only FIG 3 9 LEFT RIGHT ...

Page 37: ...omO O0 0 to 0 02 2 Boiler types 0 00 0 ACO 27 32 MFFI COMBI 0 02 2 ACO 27 32 RFFI SYSTEM e e from0 00 0 to 0 03 3 Secondary outlet function 0 00 0 p p from0 01 1 to1 15 5 or C CO O Pump overrun Central Heating mins 0 02 2 c c from0 00 0 to 0 01 1 Comfort function only model MFFI 0 01 1 p p fromU U0 0 to U U1 1 Pump speed adjustment modulating or single speed U U1 1 3 6 OPERATING PARAMETERS The boi...

Page 38: ...ter P page 41 To return to the normal display press the menu button left hand display right hand display Function factory setting r r from0 00 0 to 0 01 1 selects low temperature systems or standard systems 0 01 1 Standard 0 00 0 Low Temperature p p from9 90 0 to 9 91 1 Temperature regulation controlled by external sensor 9 90 0 p p6 6 from 2 20 0 to 2 20 0 Correction of heat curve translation P P...

Page 39: ...INIMUM POWER NOT BE SET BELOW 20 AS INDICATED IN THE GRAPH BELOW Ignition Delay adjustment 3 3 The re ignition delay for Central Heating can be adjusted to between 0 and 7 minutes The delay is factory set to 2 minutes The value set can be displayed and modified as illustrated in Section 3 6 1 parameter 3 Maximum Central Heating temperature 5 5 This parameter allows the setting of the maximum tempe...

Page 40: ...ssing the COMFORT button key on the control panel see section 3 3 When the function is active a yellow light G comes on again located on the control panel The comfort function can be activated or deactivated by pressing the and keys 0 00 0 Comfort function deactivated 0 01 1 Comfort function active for 30 minutes factory setting It is possible to deactivate the comfort function by pressing the but...

Page 41: ...et up the external sensor proceed as follows 1 Access the settings menu by pressing the and buttons for five seconds 2 Press the button 5 times to access Parameter 6 3 P P 6 6 will now appear in the left hand display 4 Adjust the parallel shift by turning the heating control knob clockwise to increase or anti clockwise to decrease as shown below The shift value can be read on the right hand displa...

Page 42: ... of those shown in Fig 3 31 By using the programming keys and the curve may be changed to select the required curve for the system The curves that can be selected are as follows Convector radiator Curve 2 5 to 3 Steel radiator Curve 1 5 to 2 Oversized steel radiator Curve 1 to 1 2 Under floor heating Curve 0 3 to 0 5 WARNING If curve 0_3 or 0_5 is selected a system safety thermostat must be connec...

Page 43: ...temperature C Outdoor temperature C Fan speed rpm Last safety shut off see section 3 10 Last shutdown see section 3 10 3 6 2 SETTINGS DISPLAY To return to the normal display press the menu key The boiler will automatically return to the normal display after no buttons have been pressed for 2 minutes NOTE 1 U 1 means that U U and 1 1 blink alternately on the display NOTE 2 the value 100 appears as ...

Page 44: ...adjusting further until you obtain the correct CO2 reading Allow the reading to become stable for at least 4 minutes 3 When the check is over replace the cap on screw 2 Fig 3 33 4 Disable operation at minimum power by pressing the key or press the key to check the maximum value dashes at top of display see Fig 3 31 While the appliance is operating at maximum power check the gas rate of the applian...

Page 45: ...MEND THAT THE MINIMUM POWER NOT BE SET BELOW 20 AS INDICATED IN THE GRAPH BELOW 3 7 CHANGING THE TYPE OF GAS It is not possible to convert the ACO 27 32 MFFI RFF to LPG A specific LPG version is available as the following codes ACO 27 MFFI 537061 ACO 27 RFFI 537063 ACO 32 MFFI 3300005 ACO 32 RFFI 3300007 3 8 ADJUSTING THE HOT WATER FLOW RATE To adjust the hot water flow rate it is necessary to fir...

Page 46: ... DISPLAY CAUSE A A0 01 1 Too many attempts to ignite on start up A A0 02 2 No water or no water circulation in central heating system A A0 03 3 The heating flow temperature exceeds 105 C during operation A A0 07 7 Too many failures to ignite in one period during operation A A3 33 3 Problem with the fan A A9 97 7 Problem with the electronic monitoring A A9 98 8 Problem with the electronic monitorin...

Page 47: ...ck the following a if the central heating flow temperature is 8 C the pump stops b if the central heating flow temperature is between 3 and 8 C the pump will run for another two minutes c if the central heating flow temperature is 3 C the burner will fire heating position at minimum power until the temperature reaches 33 C the burner will go out and the pump will continue to run for two minutes If...

Page 48: ...lates to the terminal on the PCB for external controls see FIG 4 2 When connecting the boiler to an external cylinder it is necessary to remove the integral clock from the boiler see SECTION 7 6 3 do not run 240V cables and the TA cables together use separate cables to prevent induced voltage on the low voltage switching circuit NOTE THE USE OF A Y PLAN SYSTEM IS NOT POSSIBLE WITH THE ACO BOILER D...

Page 49: ...49 WIRING DIAGRAM FOR CONNECTION TO AN ARISTON UNVENTED CYLINDER DIAGRAM A ...

Page 50: ...50 WIRING DIAGRAM FOR CONNECTION TO AN OPEN VENTED CYLINDER DIAGRAM B ...

Page 51: ...ised the ignition is checked and the temperature and flow through the boiler is monitored by the electronics The DT must increase by more than 50o C To check the correct temperature and flow the boiler remains at a fixed output for 5 seconds this value is 50 and can be viewed at Step 6 Section 3 6 1 Incorrect readings will result in the error code A02 being displayed and the pump stopping Followin...

Page 52: ...unscrew the lower part of the condensate trap and clean it Lastly fill it with water and replace the stopper 6 2 CLEANING THE PRIMARY EXCHANGER 6 3 CLEANING THE CONDENSATE TRAP 6 4 OPERATIONAL TEST After having carried out the maintenance operations fill the heating circuit to a pressure of approx 1 5 bar and release the air from the system Also fill the domestic hot water system Place the boiler ...

Page 53: ... casing proceed as follows To remove the front casing panel follow these steps 1 Remove the screws A Fig 7 1 2 Loosen the four screws B from the case hooks two at the top and two at the bottom and rotate anti clockwise Fig 7 2 3 Lift and unhook the case panel Fig 7 3 4 Lower the control panel Fig 7 4 To ensure efficient safe operation the boiler must be serviced annually by a competent person Befo...

Page 54: ... 5 2 Disconnect the compensation tube D FIG 7 5 3 Remove the clip E FIG 7 6 4 Unscrew the four screws F FIG 7 7 5 Remove the fan FIG 7 8 7 3 ACCESS TO THE COMBUSTION CHAMBER 7 3 1 REMOVING THE FAN FIG 7 6 E FIG 7 5 C D FIG 7 7 FIG 7 8 F F F F FIG 7 4 ...

Page 55: ...tube H FIG 7 9 3 Unscrew the two screws I FIG 7 10 4 Remove the Air Pressure Switch 7 3 2 REMOVING THE AIR PRESSURE SWITCH 7 3 3 REMOVING THE BURNER With the fan removed see Section 7 3 1 1 Remove the four allen screws J FIG 7 11 2 Slide the burner from its housing FIG 7 12 7 13 FIG 7 11 FIG 7 12 FIG 7 13 J ...

Page 56: ...3 7 24 FIG 7 16 FIG 7 17 FIG 7 14 FIG 7 15 7 3 4 REMOVING THE ELECTRODES 1 Remove the two allen screws K pulling off the ignition cable FIG 7 14 3 Extract the electrodes FIG 7 15 K L M N N M L L L L L IMPORTANT Every time that the combustion chamber cover or the primary heat exchanger is removed from the boiler the combustion chamber seal must be checked and where necessary replaced code 65102217 ...

Page 57: ...57 FIG 7 19 FIG 7 20 FIG 7 21 FIG 7 22 FIG 7 23 FIG 7 24 O P FIG 7 18 ...

Page 58: ... FIG 7 26 3 Remove the condensate tube 7 3 7 REMOVING THE CONDENSATE TRAP 1 Remove the condensate trap tube see section 7 3 6 2 Unscrew the screw S FIG 7 27 3 Remove the blanking cap T FIG 7 28 4 Remove the trap from the boiler NOTE Take care when removing the blanking cap to place a container under the boiler as this will release the contents of the condensate trap Q R S T ...

Page 59: ...X from the bottom of the gas valve pipe FIG 7 32 4 Remove the gas valve FIG 7 33 FIG 7 29 FIG 7 30 FIG 7 31 FIG 7 33 FIG 7 32 1 Remove the casing and lower the control panel as instructed in Section 7 1 2 Press the release button U for the control panel Fig 7 29 and pull forward to remove from the boiler frame 3 Clip the control panel onto the frame of the boiler Fig 7 30 U V X W X ...

Page 60: ...8 3 Before replacing the exchanger ensure that the O rings are in good condition and replace if necessary Important Before any component is removed the boiler must be drained of all water FIG 7 36 FIG 7 37 FIG 7 38 7 4 2 REMOVING THE SPARK GENERATOR 1 Disconnect the electrical connection Y from the spark generator FIG 7 34 2 Remove the screws Z from the bottom of the spark generator FIG 7 35 4 Rem...

Page 61: ... VALVE 1 Remove the U clip A2 Fig 7 39 2 Remove the valve Fig 7 40 FIG 7 40 FIG 7 39 7 5 3 REMOVING THE AUTOMATIC AIR VENT 1 Remove the U clip A3 FIG 7 41 2 Unscrew valve FIG 7 42 3 Remove FIG 7 43 FIG 7 42 FIG 7 43 FIG 7 41 A3 A2 ...

Page 62: ... A6 7 5 5 REMOVING THE D H W FLOW SWITCH MFFI ONLY 1 Unplug the electrical connector 2 Unscrew the four screws A6 FIG 7 46 3 Remove the D H W flow switch FIG 7 47 FIG 7 46 FIG 7 47 A5 FIG 7 44 7 5 4 REMOVING THE DIVERTER VALVE ACTUATOR 1 Unplug the electrical connector A4 FIG 7 44 2 Release the retaining clip A5 and remove the diverter valve actuator FIG 7 45 FIG 7 45 A4 ...

Page 63: ...G 7 50 7 5 7 REMOVING THE PRESSURE GAUGE 1 Release U clip B1 FIG 7 51 7 52 2 Ease the pressure gauge through the control panel from the rear 3 Remove the pressure gauge FIG 7 53 FIG 7 51 FIG 7 52 FIG 7 53 B1 ...

Page 64: ...g off Fig 7 58 2 Unscrew and remove the D H W temperature probe B6 FIG 7 59 B6 FIG 7 58 FIG 7 59 7 5 8 REMOVING THE EXPANSION VESSEL 1 Unscrew the screws B2 FIG 7 54 2 Loosen nut B3 FIG 7 55 3 Unscrew the screw B4 FIG 7 56 3 Remove the expansion vessel FIG 7 57 B2 FIG 7 54 FIG 7 55 FIG 7 56 FIG 7 57 B3 B4 B5 ...

Page 65: ... Fig 7 60 2 Remove the electrical connection from the C H flow temperature probe FIG 7 61 FIG 7 62 FIG 7 63 7 5 11 REMOVING THE C H RETURN TEMPERATURE PROBE N T C 1 Unscrew the two screws B8 Fig 7 62 2 Remove the electrical connection from the C H flow temperature probe FIG 7 63 FIG 7 61 B7 B8 ...

Page 66: ...nspection cover of the PCB box FIG 7 66 2 Unplug all the electrical connections FIG 7 67 3 Unscrew the screws C1 FIG 7 67 4 Pull forward the main PCB FIG 7 68 5 Unscrew the screws C2 Fig 7 69 6 Remove the cover of the control panel FIG 7 70 7 Unscrew the display P C B mounting screws C3 and disconnect the P C B connection cable C4 FIG 7 71 8 Remove the display P C B FIG 7 72 9 Replace either P C B...

Page 67: ...VING THE TIME CLOCK 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 FIG 7 73 3 Remove the time clock FIG 7 74 FIG 7 74 FIG 7 73 C2 C2 C2 C3 C3 C3 C3 C4 ...

Page 68: ...ssible to detect and correct defects by using the standard fault finding diagrams described in this chapter NOTE THESE CHECKS ARE NOT EXHAUSTIVE 8 1 FAULT FINDING GUIDE FLOW CHARTS Model 27 32 MFFI 8 FAULT FINDING ...

Page 69: ...69 Model 27 32 RFFI SYSTEM ...

Page 70: ...70 ...

Page 71: ...71 ...

Page 72: ...1 61 60 22 23 24 20 19 21 86 28 94 95 93 110 32 33 40 72 70 69 73 80 71 81 14 13 7 6 1 12 8 7 8 6 9 10 62 4 3 5 58 57 5 63 6 64 4 2 54 52 53 111 109 112 113 88 134 122 128 136 126 121 121 124 133 107 108 108 106 105 88 91 90 118 117 67 66 65 123 122 119 120 130 132 131 129 135 59 59 56 55 125 125 116 115 114 18 88 127 75 6 205 ON OFF CONFORT RESET M 208 207 210 215 216 202 201 205 204 203 212 213 ...

Page 73: ...65102902 46 Automatic air vent 995865 54 Expansion vessel 995940 55 Air pressure switch 65102232 75 Hose clip 990662 90 Retaining clip NTC CH 65101007 91 NTC CH 990405 101 Repair kit 3 way valve 65101288 107 Main exchanger 27 KW 65103211 107 Main exchanger 32 KW 65103219 125 Ignition electrode 65102198 129 Detection electrode 65102199 131 Fan 65102248 135 Burner 27kW 65103221 135 Burner 32kW 65103...

Page 74: ...71 78 69 14 13 7 6 1 12 8 7 8 6 9 10 60 4 3 5 56 55 5 61 6 62 4 2 52 50 51 97 95 98 99 29 120 108 114 122 112 107 107 110 119 93 94 94 92 91 29 86 85 104 103 65 64 63 109 108 105 106 116 118 117 115 121 57 57 54 53 111 111 102 101 100 29 113 72 6 35 34 33 89 30 29 32 15 49 205 ON OFF RESET M 208 207 211 216 217 202 201 205 204 203 213 214 215 206 212 210 code 65102299 209 27 32 RFFI SYSTEM ...

Page 75: ...nt 995865 52 Expansion vessel 995940 53 Air pressure switch 65102232 74 Hose clip 990662 89 Retaining clip NTC CH 65101007 88 NTC CH 990405 93 Main exchanger 27 KW 65103211 93 Main exchanger 32 KW 65103219 115 Ignition electrode 65102198 118 Detection electrode 65102199 120 Fan 65102248 123 Burner 27kW 65103221 123 Burner 32kW 65103220 216 Display P C B 65102235 217 Cable Display P C B 65102185 98...

Page 76: ...te trap and condensate hoses see Section 7 3 6 and 7 3 7 check the drain system for correct discharge of condensate and clean if necessary 8 Remove and clean the DHW flow switch 9 Remove and clean the fan 10 Remove and clean the electrodes with an emery cloth 11 Remove and clean the burner 12 Check and clean the primary heat exchanger as necessary 13 Refill the boiler and check the following 14 Ch...

Page 77: ...77 ...

Page 78: ...78 11 BENCHMARK COMMISSIONING CHECKLIST ...

Page 79: ...79 12 SERVICE INTERVAL RECORD ...

Page 80: ...ring defect Failure to pay an invoice for any such occurence will be assumed by MTS that you accept that your appliance has not been installed correctly and understand that any manufacturer s guarantee has been withdrawn On the 12 month anniversary of the appliance installation you must have it serviced to continue any guarantee offered into the following year Failure to do so will invalidate your...

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Ariston ACO 27 MFFI, Installation And Servicing Instructions

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