COMBI A SERIES Combi A 24 MFFi Combi A 30 MFFi Installation and Servicing Instructions Type C Boilers G.C.N: G.C.
These instructions are suitable for the Combi A boilers : Do not forget the Log Book! MTS supports Benchmark, the heating industry code to ensure the correct installation, commissioning and servicing of domestic central heating systems. To The Householder Make sure you have a completed Log Book for your boiler. This provides a record of the commissioning of your boiler. It contains important information about your particular installation that may be required by service engineers.
Contents CUSTOMER CARE Page Guarantee ............................................................................................................................................................2 Statutory Requirements .......................................................................................................................................2 Contents ..................................................................................................................................................
SERVICING INSTRUCTIONS 18 REPLACEMENT OF PARTS .........................................................................................................................42 18.1 To Gain General Access........................................................................................................................42 18.1.1 Removing the front panel.......................................................................................................................42 18.1.2 Lowering the control panel.....
USER INSTRUCTIONS 1. Control panel 30 27 28 26 16 31 29 Fig. 1 32 Control panel (Fig. 1) 35 39 : Gas service tap 40 : Water service tap 41 : Central heating flow isolating valve 42 : Central heating return isolating valve and temperature setting 31.- Central Heating control knob 32.- Menu button 33.- Reducing button 34.- Increasing button 35.- Setting button 34 Connecting bracket Taps shown in Open position (Fig. 2) 16.- Pressure gauge 26.- Display 27.
2. How to use Switching on and filling instructions 1. Check the pressure in the central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16 (fig.1), should it be neccessary to re-pressurise the system,ensure the filling loop 45 (fig. 2) is attached, open the filling taps 43 & 44, the pressure gauge will now start to rise, once the pressure reads 1.0 bar, close the filling taps and disconnect the filling loop. 2.
Stand-by mode Turn the control knobs 30 and 31 to the OFF position to deactivate the DHW and Heating. Leave the ON/OFF button On with the green light on. During the stand-by mode the display indicates the time, anti-seizing and antifreezing will be active. Switch OFF Press the button ON/OFF. During this mode the boiler will not operate, but is still connected to the mains. Anti-freezing mode Turn the control knobs 30 and 31 to OFF to switch off the heating and hot water functions.
6. Setting the time clock 6.1 Setting the mechanical clock 12 9 3 6 Fig. 3 A 3 2 4 1 24 23 22 12 5 21 C 6 7 19 9 20 I 8 18 9 17 B 15 14 13 10 16 6 12 11 Fig. 4 1. General layout The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A (Fig. 4). An override switch is located on the clock B (Fig 4). 2.
6. Setting the time clock (continued) 6.2 Setting the Digital Clock Manual switch Summer and winter time setting Reset Enter switching times h Prog . Enter the hours Weekdays flash m Imput time Enter minutes Day Enter weekday/s Automatic Operation Manual Operation Continuous Operation = ON = ON = Continuously ON = OFF = OFF = Continuously OFF The switching times correspond to the program entered.
6. Setting the time clock (continued) Entering the switching times You have 20 memory Iocations available. Each switching time takes up one memory location. Keep pressing the “Prog” button until a free memory location is shown in the display “– –:– –”.
INSTALLER INSTRUCTIONS 7. Description 1.- Steel chassis complete with expansion vessel 2.- Sealed chamber 3.- Burner and heat exchanger assembly 4.- Air / gas connection 5.- 24 V modulating fan 6.- Gas valve 7.- Ignition electrode 8.- Ionisation probe 9.- Ignitor 10.- Combustion products manifold 11.- Siphon 12.- Silencer 13.- Electrical box 14.- Pump 15.- Secondary heat exchanger 16.- Pressure gauge 17.- Three way valve 18.- Automatic air vent 19 - Domestic hot water flowswitch 20.
8. Dimensions All dimensions in mm 289 21 Safety valve C/H and condensate J Heating flow K D.H.W. outlet L Gas supply M Cold water inlet N Heating return With packaging : 24 kW : 37 kg 30 kW : 40 kg 720 691,5 162 141 I 172,5 121,5 4,7 I J KLM N I minimum space required 450 450 mini pour entretien 32 296 296 (24 kW) 360 (30/35 kW) 54 54 54 54 440 390 J K L M N Fig. 8 9. Hydraulic data The boiler is fitted with an automatic by-pass as standard.
10. Installation requirements Reference Standards 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 standards curently in effect, as well as with any and all local health and safety standards i.e. CORGI. In the Republic of Ireland the installation and initial start up of the appliance must be carried out by a Competent Person in accordance with the current edition of I.S.
10. Installation requirements (continued) Electrical Supply The appliance requires an earthed 230V - 50 Hz supply and must be in accordance with current I.E.E. It must also be possible to be able to completely isolate the appliance electrically. Connection should be via a 3 amp fused doublepole isolating switch with contact separation of at least 3 mm on both poles. Alternatively, a fused 3 Amp. 3 pin plug and unswitched socket may be used, provided it is not used in a room containing a bath or shower.
10. Installation requirements (continued) into a suitable acid resistant pipe - e.g. plastic waste or overflow pipe. The condensate discharge pipe must have a minimum diameter of 22mm, must have a continuous fall and preferably be installed and terminated to prevent freezing. The discharge pipe must be terminated in a suitable position: giving a minimum water seal of 75mm and an air break must be incorporated in the pipe run, as above.
11. Installing the boiler Please check that you are familiar with the installation requirements before commencing work (Section 10). The installation accessories described in the following list are included in the boiler packaging: - Hanging bracket - A paper template (showing the dimensions of the boiler with 5 mm side clearances) - Connection tails and valves - Screws and washers - Connection washers - Installation, Servicing and Operating Instructions Method of positioning the boiler on the wall.
11. Installing the boiler (continued) A A Fig. 12 1 2 12 9 3 6 Fig. 13 P P 12 9 3 6 Fig. 14 Fig.
12. Connecting the Flue The boiler should only be installed with a flue system supplied by MTS (GB) Limited. These kits are supplied separately to the appliance in order to respond to different installation solutions. For more information with regard to the inlet/outlet accessories consult the accessory catalogue. The boiler is supplied ready for connection to a concentric flue system.
12.1 Fitting the coaxial flue (Ø 60/100 Horizontal) CONTENTS: 1X SILICONE O-RING (60mm) 1X ELBOW (90 ) 2X WALL SEALS (INTERNAL & EXTERNAL) 1X FLUE PIPE INCLUDING TERMINAL (1 METRE - 60/100) 1X FLUE CLAMP 1X SCREWS 1x Seal Once the boiler has been positioned on the wall, insert the elbow into the socket and rotate to the required position. possible to rotate the elbow 360o on its vertical axis. O NOTE: It is Using the flue clamp, seals and screws supplied (Fig 19) secure the elbow to the boiler.
162 Fig. 20 Fig. 21 Fig.
12.3 Fitting the Coaxial Flue (Ø 60 / 100 Vertical) NOTE: SEE PAGE 23 FOR MAXIMUM AND MINIMUM FLUE RUNS. CONTENTS: 1X SILICONE O-RING (60mm) 1X CONICAL ADAPTOR (60/100mm) 1X VERTICAL FLUE KIT (80/125mm) 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. The Vertical flue kits useable lengths with the pitched roof flashings are indicated in Fig. 23.
12. Connecting the flue (continued) 12.4 Fitting the twin pipe (Ø80/80) NOTE: SEE PAGE 23 FOR MAXIMUM AND MINIMUM FLUE RUNS (TABLE C) 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. Always ensure that the flue is adequately supported, avoiding low points. (MTS supply suitable clamps as Part No.
12. Connecting the flue (continued) 123,5 107 200 25 ø 100 Fig. 27 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 necessary to cut a larger diameter hole for the flue pipe, this should be ø100 mm, this will then allow for easier assembly of the air intake elbow and the tube outside the wall (see Fig. 28). 60 mm Fig. 28 TABLE A TABLE B TABLE C Concentric outlet 60/100 Min length Max.
12. Connecting the flue (continued) TYPE 1 TYPE 4 TYPE 3 TYPE 2 TYPE 5 NOTE: DRAWINGS ARE INDICATIVE OF FLUEING OPTIONS ONLY. AIR INTAKE MUST NOT BE FITTED ABOVE THE EXHAUST AIR INTAKE EXHAUST AIR INTAKE Fig.
13. Electrical connections Making the Electrical Connections Hinge down the electrical box to gain access to the electrical connections. Push in the tabs P (Fig. 30) on either side of the boiler and pivot the box forward. Remove the PCB cover (see Section 18.4 - page 50). Connect the live neutral and earth wires to the main cable. P If using a room thermostat or other external control, they can be connected in place of the link on the terminal block (Diagram A- Fig.32).
13. Electrical connections (continued) - If a remote time clock is to be fitted, using a volt-free switching time clock, remove the link wire and connect the switching wires from the time clock following points above (see also Diagram B Fig. 32). - If using an external time clock and room thermostat, remove the link wire and connect in series as above (see also Diagram C Fig. 32). Live and Neutral connections to operate the clock motor must be taken from a suitable source. Connector 11 (Fig.
13. Electrical connections (continued) 13.1 Fitting the Digital Time Clocks To fit the digital time clock it is necessary to proceed as follows; (this should only be carried out by a competent engineer) - - Isolate the electrical supply to the appliance; Remove the front panel as described in Section 18.1.1; Remove the plastic cover with the mecanical time clock on the right hand side (Fig. 33) and pull out the 4 wires (Fig. 34); NOTE: THE WIRES MAY BE TUCKED BEHIND THE ELECTRICAL COVER.
14. Commissioning and testing 14.1 Initial preparation MTS (GB) Limited support the initiative. In Sections 24 and 25 (pages 60 and 61) of this manual the Commissioning Checklist and Service Interval Record can be found. It is important that this is completed in the presence of your customer, they are shown how to use it, and it is signed by them. Please instruct your customer that they must have this manual with them whenever they contact a service engineer or us.
14. Commissioning and testing (continued) 14.3 Adjusting the CO2 14.4 Gas Conversion 2. Make sure that all radiator valves are open; 3. Turn on the gas cock and check the seals on the connections with any approved soap solution and eliminate any leaks; 4. Press the reset button 29 (Fig. 1) the boiler will re-attempt ignition. If the burner does not light the first time, wait 1 minute and repeat the procedure; 5.
14.7 External sensor and ambient sensor set-up (where fitted) N.B. To ensure that these parameters are set correctly, consult the "thermo-regulation help" document enclosed with the documentation folder. 14.8 Completion For the Republic of Ireland it is necessary to complete a “Declaration of Conformity” to indicate compliance to I.S.813. An example of this is given in the current edition of I.S.813. In addition it is necessary to complete the Commissioning Checklist in Section 24 of this manual (Page 60).
14. Commissioning and testing (continued) 14.10 Instructing the end user 1. Hand over these instructions and explain how to use the time clock and room thermostat (if fitted) and explain how to register the guarantee; 2. Show the end 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.
15. Fitting the casing Fitting the casing Remove the protective film on the casing: - Locate the lower clips into the slots in the chassis - Engage hooks N on the casing in notches R on the side panels M operation (Fig. 42) - Fit the top of the panel in place - Close the panel mounting clamps (Fig. 43) - Screw in the two clamp locking bolts A Note: it is essential to refit both locking bolts A A M 1 R 12 9 3 6 12 9 3 6 Fig. 42 32 N Fig.
16. Sequence of operation 16.1 Central Heating Mode Activation of the time clock and/or room thermostat starts the boiler. The display panel indicates the flow temperature s in central heating as illustrated below: Central heating mode ON Room thermostat contact ON 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.
16. Sequence of operation 16.2 Domestic Hot Water Mode The Domestic Hot Water (DHW) production always has priority over the Central Heating (CH) mode. When a hot tap is turned on, the DHW flow switch is activated. The minimum DHW flow rate is 2 l/min. If the diverter valve is in the CH position it will motor into the DHW position and the boiler will start. The LCD will show that the boiler is working in hot water mode as below: The appliance follows the same operating logic as described in Section 16.
17. Adjustments and settings 4 2 1 24 23 12 5 21 6 I 7 19 9 8 18 9 17 15 14 13 10 6 16 12 11 Programming button 20 On/Off push button 3 22 The boiler is delivered with pre-set values described in menus 3 and 4. All settings must only be changed by the installer or a qualified person. To gain access to the setting buttons please, open the front control panel cover P. and follow the instructions below. P Reset push button Fig.
ACTION DISPLAY CONFIGURATION Menu - 1 - Default register Record of the last 10 faults 5” Section Digit 1 Digit 2 Digit 3 and 4 Last fault occured 1 0 code from 01 to 99 Last but one fault occurred 1 1 code from 01 to 99 ... 1 ...
DISPLAY CONFIGURATION Factory setting ACTION Menu - 3 - Boiler options once Rubrique x times Elément 1 Elément 2 Inactive 3 0 DHW thermostatic kit fitted to boiler? (fix DHW temp to 65°C) 3 1 Elément 3 et 4 -- 0 : non 1 : oui 0: on heating and reheating of exchanger Optional programmer action 3 2 1: on reheating of exchanger 2: on the heating Inactive 3 3 -- Inactive 3 4 -- 3 5 0 to 5 mn by step 0,5 mn (time before DHW flow detection to override pressure peak problem) 3 6 0
DISPLAY CONFIGURATION Factory setting ACTION Menu - 4 - Boiler settings once Section Digit 1 Digit 2 4 0 Digit 3 and 4 0 : no Stop pump after burner stops 1 : yes x times 0 : High speed Pump speed 4 1 1 : Adaptive 38 0 to 5 min by step 0.5 min Pump post circulation duration 4 2 Inactive 4 3 Maximum Central Heating flow temperature 4 4 Minimum Central Heating flow temperature 4 5 Inactive 4 6 Inactive 4 7 CH anti-cycling delay 4 8 0 to 7 min by step 0.
ACTION DISPLAY CONFIGURATION Menu - 5 - Combustion rate control mode (test mode) Effect Display once Combustion rate control mode OFF Combustion rate control mode ON The main exchanger temperature appears on the display. The digit - on the display shows the gas output level. (Top = max, bottom = min). Gas output setting To modify the gas output use the + and buttons. once x times To cancel the combustion rate control mode press the “Menu” button.
DISPLAY CONFIGURATION Factory setting ACTION Menu - 6 - Thermo-regulation settings once Section Digit 1 Digit 2 Digit 3 and 4 0: Heating setting can be adjusted by the user 1: Variable heating setting depending on the external temperature x times Type of control 6 0 2: Variable heating setting depending on the room temperature (Clima Manager)* 3: Variable heating setting depending on the external and room temperatures (Clima Manager)* Compensation 6 1 If or 00 to 20 in intervals of 1 Slo
17. Adjustments and settings (continued) CH anti cycling delay setting : If you would like to change the setting of CH anti cycling delay, if you want 3 min, proceed as follows: (NOTE : THE FACTORY SETTING IS 2 MIN 30 SECONDS AND THE FOLLOWING EXPLANATION REFER TO MENU 4 SECTION 8) Display 1 Switch to installer mode, press button and 1 5” for 5 seconds, the display shows :10=0 if there is no default in the default register.
SERVICING INSTRUCTIONS A To ensure efficient safe operation, it is recommended that the boiler is serviced annually by a competent person, refer to Section 20 (page 53) for the Servicing Schedule. 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.
18.2 Access to the Combustion Chamber 18.2.1 Removing the air gas assembly 1. Isolate the gas supply to the boiler; 2. Carry out step 18.1.1; 3. Remove the silencer (Fig. 49); 4. Disconnect the detection electrode cable (Fig. 50); 5. Remove the earth cable from the ignition electrode (Fig. 51), and remove the ignition electrode cable from the ignitor (Fig. 52) Fig. 51 Fig. 50 Fig. 49 6. Unplug the gas valve and fan connectors (Figs. 53 and 54); Fig. 52 Fig. 54 Fig. 53 7.
18.2.2 Removing the burner Do not remove the burner unless absoluly necessary. 1. Carry out step 18.1.1 and 18.2.1 (without removing the 4 nuts D); 2. Remove the 3 screws F from the air/gas manifold (Fig. 58); 3. Slide the burner out from the front, taking care not to damage the insulation (Fig. 59a 24 kW & 59b 30 kW); 4. Reassemble in reverse order and checking all seals are undamaged and the burner is positioned correctly (Fig. 60). If necessary, replace the insulation too. D Fig. 59a F Fig.
18.2.5 Removing the fan 1. Carry out step 18.1.1; 2. Remove the air gas manifiold as in step 18.2.1 (Fig. 67); 3. Unscrew the two screws from the venturi J and remove with the gas valve (Fig. 68); 4. Unscrew the three screws K on the air/gas pipe and remove (Fig. 69); 5. Reassemble in reverse order. K J Fig. 67 Fig. 68 Fig. 69 18.2.6 Removing the gas valve 1. Carry out step 18.1.1; 2. Remove the air gas manifiold as in 18.2.1 (Fig. 70); 3.
18.2.7 Removing the heat exchanger 1. Carry out step 18.1.1; 2. Remove the air gas manifiold as in 18.2.1 (Fig. 74); 3. Remove the flow pipe clip and unscrew the pump nut (Fig. 75a & 75b); 4. Remove the flow and return pipes and the condense drain pipe from the heat exchanger. (Fig. 75c); Fig. 75a Fig. 74 Fig. 75b 5. Remove the two bolts securing the exchanger (Fig. 76); 6. Remove the screw M2; then rotate clockwise the bearing frame (Fig. 77); Fig. 75c 7.
18.3 Access to the Water Circuit Important! Before any component is removed, the boiler must be drained of all water. 18.3.1 Drain down DHW : close the DHW inlet tap and open a tap on the installation / CH : Close the flow and return isolating valve and open the pressure relief valve. 18.3.2 Removing the 3 way valve 1. 2. 3. 4. Carry out steps 18.1.1 and 18.1.2; Disconnect the flow switch reed relay “P1”; Remove the clip “P2” and the 3 way valve motor (see Figs.
18.3.4 Removing the secondary heat exchanger 1. 2. 3. 4. Carry out step 18.1.1 and 18.1.2; Remove the 3 way valve motor as in step 18.3.2; Disconnect the expansion vessel pipe. Unscrew the two fixing screws R (see Figs. 90); 5. Unscrew the two fixing screws R and pull the heat exchanger toward you (see Figs. 90 & 91); 6. Reassemble in reverse order; The heat exchanger is so designed that it cannot be remounted incorrectly; R Fig. 91 Fig. 90 18.3.5 Removing the pump 1. Carry out step 18.1.1; 2.
18.3.6 Removing the pressure relief valve 1. Carry out step 18.1.1 and 18.3.1; 2. Remove the clip securing the valve (see Fig. 96) and pull it toward you; 3. Reassemble in reverse order; take care to ensure the valve is in the correct position; Fig. 96 18.3.7 Removing the expansion vessel 1. Carry out step 18.3.1; 2. Isolate the gas supply and disconnect all pipe connections; 3. Remove the boiler from the wall 4. Unscrew the nut U (see Fig. 97); 5. Pull the expansion vessel to remove it (see Fig. 98); 6.
18.3.11 Removing the pressure gauge 18.3.12 Removing the pressure switch 1. Carry out steps 18.1.1 and 18.3.1; 2. Remove the pressure gauge by releasing the two clips V and pulling the pressure gauge out. (see Fig. 101) 1. Remove the casing as in step 18.1.1 and drain down as in step 18.3.1; 2. Pull off the connections. Then remove the pressure switch by releasing it’s securing clip (see Fig. 102). V Fig. 101 Fig. 102 18.3.13 Removing & cleaning the condensate trap 1.
4. Remove the two screws W3 from the front control panel and lower the front control panel (see Fig. 107); 5. Remove all electrical connections from the display PCB (see Fig. 108); W3 Fig. 107 6. To remove the display PCB, remove the two screw W4 and lift the PCB out (see Fig. 109); 7. Reassemble in reverse order; Fig. 108 8. To remove the main PCB disconnect all electrical connections and remove the two screws W5 (see Fig. 110); Fit the correct EEPROM supplied with the replacement PCB; 9.
19. Incorrect function In case of problem, or when the boiler has displayed an error code, the display flashes 2 digits. Please refer to the table below to diagnose the fault. For faults 01 and 03, A appears on the display, the boiler is locked and the reset button illuminates (28). To reset the boiler press the reset button 29. 29 Overheating lock out FAULT Fig.
19. Incorrect function (continued) Fault Cause The boiler doesn’t start No gas, no water or no Control gas, water and electrical electricity supply, fuses… Red indicator alight Solution Air in the gas pipe Purge the air from the gas pipe Room thermostat switched off Turn the room thermostat up Overheat lockout (A01) No flame after safety time (A03) No flame detected (E04) Flame lift (E18) Wait for a few minutes Press the reset button 29 (Fig.
21. Short spares list 103 539 101 543 615 110 112 624 502 111 506 616 554 531 649 401 532 537 538 407 CO M BI A 24 30 Key N Description Manf. Pt. N Manf. date Type Other FF FF 0100 0101 BURNER ASSEMBLY BURNER 24KW BURNER 30KW 0103 0110 0111 0112 SOUPAPE 0400 0401 GAS SECTION IGNITION ELECTRODE IONIZATION ELECTRODE GASKET D:85-66.5-2.
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Model Combi A 30 MFFi CE certificate 1312-BP-4084 Performance category **** NoX class 5 Category II2H3P Heating output 80°C/60°C Kw 6 to 27 Heating output 50°C/30°C Kw 7 to 29 Variable hot water power Pn max Kw 30,2 Nominal gas flow rate (15 °C-1013 mbar) min Central Heating & DHW flow rate max Qn kW 6,5 28 30 3 G 20 (NG H -Lacq) 34,02 MJ/m under 20 mbar Vr m /h 0,69 2,96 3,17 G 31 (Propane) 46,4 MJ/kg 37 under mbar Vr kg/h 0,50 2,17 2,33 3 Membrane Diameter (m
23. Benchmark Commissioning Checklist BENCHMARK No. GAS BOILER COMMISSIONING CHECKLIST BOILER SERIAL No. NOTIFICATION No.
24. Service Interval Record S E R V I C E I N T E R VA L R E C O R D It is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record Below. Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service as described in the boiler manufacturer’s instructions.
25.
Manufacturer: MTS (SA) - France Commercial subsidiary: M T S (GB) Limited MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone: Fax: Internet: E-mail: (01494) 755600 (01494) 459775 www.mtsgb.ltd.uk info@uk.mtsgroup.
