Chaffoteaux & Maury Minima HE System 24 Nat Installation, Servicing And Operation Manual Download Page 27 | Manualshive

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Fig. 32

1

5

11

12

13

14

15

2

3

4

8

9

7

6

10

Making the Electrical Connections

Lower the electrical box to gain access to the elec-
trical connections. Push in the tabs

P

(Fig. 31) on

either side of the boiler and pivot the box forward.

If using a room thermostat or other external control,
they can be connected in place of the link on the ter-
minal block (Diagram A- Fig. 33).

Note: Use only controls designed for voltage free
switching or 24V supply. Do not connect to a 230V
supply, and do not run 230v cables alongside the
low voltage cables.

All necessary settings for room thermostat opera-
tions are described in Section 17 ADJUSTMENTS
AND SETTINGS.

13. Electrical Connections

P

P

Fig. 31

L

EGEND

1

NTC Connectors

2

Display Connectors

3

EEPROM Key

4

24V DC Supply

5

Fan Connector

6

Flame Detection Connector

7

Fuses 2A 230V (X2)

8

230V Connector

9

Auxillary 230V Connector

10

Not Used

11

Time Clock Connector (Internal)

12

Room Thermostat Connector (

ROOM

)

13

Remote Control Connector

14

Under Floor Heating Connector

15

Not Used

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Summary of Contents for Minima HE System 24 Nat

Page 1: ...tem 30 Nat 41 980 34 M Mi in ni im ma a H HE E S Sy ys st te em m CONDENSING WALL HUNG SYSTEM BOILER Central Heating compatible with an Indirect Cylinder Fanned Flue System Installation Servicing and Operating Instructions These instructions must be left with the appliance Country of destination GB IE c ...

Page 2: ... with the recommendations made herein or in a manner not approved by the manufacturer To assist us in providing you with an efficient after sales service please return the guarantee registration card enclosed with the boiler without delay CAUTION In the United Kingdom installation start up adjustments and maintenance must be performed by a competent person only in accordance with the current Gas S...

Page 3: ...ITTING THE COAXIAL FLUE Ø 60 100 HORIZONTAL 21 12 2 FITTING THE 5 FLUE Ø 80 125 HORIZONTAL VERTICAL 21 12 3 FITTING THE COAXIAL FLUE Ø 60 100 VERTICAL 23 12 4 FITTING THE TWIN PIPE FLUE Ø80 80 24 13 ELECTRICAL CONNECTIONS 27 13 1 FITTING THE MECHANICAL AND DIGITAL TIME CLOCKS 29 13 2 CONNECTING ZONE VALVES 30 14 COMMISSIONING AND TESTING 33 14 1 INITIAL PREPARATION 33 14 2 INITIAL START UP 33 14 3...

Page 4: ...6 18 1 2 Lowering the control panel 46 18 2 Access to the Combustion Chamber 47 18 2 1 Removing the air gas assembly 47 18 2 2 Removing the burner 48 18 2 3 Removing the detection electrode 48 18 2 4 Removing the ignition electrode 48 18 2 5 Removing the fan 49 18 2 6 Removing the gas valve 49 18 2 7 Removing the heat exchanger 50 18 2 8 Removing the spark generator 50 18 3 Access to the Water Cir...

Page 5: ... push button and red indicator lockout light 30 Central Heating control knob and temperature setting 31 Menu key 32 Reducing key 33 Increasing key 34 Setting key Connecting bracket Taps shown in Open position Fig 2 39 Gas service tap 41 Central heating flow isolating valve 42 Central heating return isolating valve 43 44 Filling taps 45 Filling loop Fig 2 41 42 43 44 45 39 16 ...

Page 6: ...time by using the or keys once the correct time has been set press the setting key once more to accept the time Note This is not a timer for Central Heating control To obtain heating Turn the Central heating knob 30 Fig 1 between mini and maxi During the setting flashes and displays the temperature the knob has been set to The flashing will continue for a while after the setting and the display wi...

Page 7: ...Heating knob turned on and the room thermostat set to its anti frost setting usually between 5 C and 10 C As with your car your boiler will work more reliably and efficiently if regularly serviced We recommend an annual service check The service history of the appliance will be marked in the Service Interval Record Section 25 Page 61 The manufacturer s guarantee is for 2 years from the date of pur...

Page 8: ...pm ON periods are set by sliding all tappets between the ON time and the OFF time to the outer edge of the dial The tappets remaining at the centre of the dial are the OFF periods 4 For operation Set the selector switch B to the symbol to control the central heating by the clock Set the selector switch B to I to select permanent operation or to 0 to turn the central heating off permanently 1 1 2 2...

Page 9: ...o its default setting activate using a pencil or similar pointed instrument Do this every time you wish to reset the time switch to erase all switching times and the current time of day After approximately two seconds the following display appears Enter current time and weekday Keep the key pressed down During the summer time period press the 1h key once Enter the hour using the h key Enter the mi...

Page 10: ...ll subsequent switching instructions Manual Override Switch With the you can change the current setting at any time The switching program already entered is not altered Reading the programmed switching times Pressing the Prog key displays the programmed switching times until the first free memory location appears in the display If you now press the Prog key once again the number of free memory Ioc...

Page 11: ... separator and automatic vent 20 Main exchanger return thermistor 21 Main exchanger flow thermistor 22 Overheat sensor 23 Central heating pressure relief valve 24 Condensate pipe 1 2 3 4 5 6 8 12 13 14 30 26 25 34 28 INSTALLER S INSTRUCTIONS 7 Fig 6 Fig 8 20 21 10 17 9 Fig 7 33 31 32 18 22 16 25 Display 26 On off push button and power on indicator light 28 Reset push button and red indicator locki...

Page 12: ...0 kW 37 kg I Safety valve C H and condensate J Heating flow K Cylinder return L Gas supply M Cold water supply N Heating return 296 24 kW 360 30 kW NOTE THE CLEARANCES STATED ABOVE ARE REQUIRED FOR SERVICING PURPOSES 440 450 mini pour entretien Minimum space required 450mm 390 mm ...

Page 13: ...on vessel in a pressurised appliance varies according to the average operating temperature in C the static height which is the difference in metres between the highest point of the appliance and the expansion vessel axis The minimum cold filling pressure of the appliance is 0 8 bar recommended pressure between 1 0 and 1 5 bar The pressure of the expansion vessel should always be greater than the s...

Page 14: ...l products such as chlorine swimming pool area or ammonia hair dresser or alkaline products launderette Flue Detailed information on flue assembly can be found in Section 12 Connecting the flue The boiler must be installed so that the flue terminal is exposed to the free passage of external air at all times and must not be installed in a place likely to cause nuisance It must not be allowed to dis...

Page 15: ...eze products such as Fernox ALPHI 11 which will prevent rust and incrustation taking place Periodically check the pH of the water anti freeze mixture of the boiler circuit and replace it when the amount measured is out of the range stipulated by the manufacturer 7 pH 8 DO NOT MIX DIFFERENT TYPES OF ANTI FREEZE In under floor systems the use of plastic pipes without protection against penetration o...

Page 16: ...ensate siphon iii Terminating into a gully below the grid level but above the water level iv Into a soakaway NOTE If any condensate pipework is to be installed externally then it should be kept to a minimum and be insulated with a waterproof insulation and have a continuous fall The total length of external pipe used should not exceed 3 metres Some examples of the type of condensate terminations c...

Page 17: ...tion Requirements continued 3 External termination of condensate drainage pipe via internal discharge branch e g sink waste proprietary fitting 4 External termination of condensate drainage pipe via condensate siphon ...

Page 18: ...lves to the boiler using the washers provided in the plastic bag 2 x fibre washers for the C H flow and return 1 x rubber washer for gas connection Safety valve discharge The pressure relief valve tube is made of copper It should terminate below the boiler safely outside the premises Care should be taken that it does not terminate over an entrance or window or where a discharge of heated water cou...

Page 19: ...19 1 2 A A Fig 14 Fig 16 Fig 13 11 Installing the Boiler continued Fig 15 P P ...

Page 20: ...with or close to inflammable material and must not pass through building structures or walls made of inflammable material When replacing an old appliance the flue system must be changed Important Ensure that the flue is not blocked Ensure that the flue is supported and assembled in accordance with these instructions 12 Connecting the Flue Fig 18 150 mm slope 5 mm per metre 150 mm slope Installatio...

Page 21: ...l has passed through the hole pull the flue back until the seal is flush with the wall Alternatively the flue can be installed from outside of the building the grey outer seal being fitted last 12 1 Fitting the coaxial flue Ø 60 100 Horizontal Should the flue require extending the flue connections are push fit however one flue bracket should be used to secure each metre of flue NOTE SEE PAGE 24 FO...

Page 22: ...22 Fig 21 Fig 22 Fig 23 ...

Page 23: ... exhaust manifold 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 avai...

Page 24: ...rminal connects to the pipe bridge this point must be adequately sealed with silicone sealant to avoid condense leakage at this point When siting 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 30 The air intake pipe can...

Page 25: ...the terminals must be on the same side of the building TABLE A Concentric outlet 60 100 Min length Max length Length equivalency for 24 30 and 35 kW Type 1 Type 2 Type 3 0 3 m 5m 45o elbow 0 5 m 90o elbow 1 m TABLE B Concentric outlet 80 125 Min length Max length 24 30 and 35 kW Type 1 0 3 m 10 m 45o elbow 0 5 m 24 30 and 35 kW Type 2 Type 3 0 3 m 10 m 90o elbow 1 m TABLE C Twin flue outlet 24 30 ...

Page 26: ...AIR INTAKE AIR INTAKE AIR INTAKE MUST NOT BE FITTED ABOVE THE EXHAUST NOTE DRAWINGS ARE INDICATIVE OF FLUEING OPTIONS ONLY TYPE 1 TYPE 5 TYPE 4 TYPE 3 TYPE 2 Fig 30 12 4 Fitting the twin pipe flue Ø80 80 continued ...

Page 27: ...voltage free switching or 24V supply Do not connect to a 230V supply and do not run 230v cables alongside the low voltage cables All necessary settings for room thermostat opera tions are described in Section 17 ADJUSTMENTS AND SETTINGS 13 Electrical Connections P P Fig 31 LEGEND 1 NTC Connectors 2 Display Connectors 3 EEPROM Key 4 24V DC Supply 5 Fan Connector 6 Flame Detection Connector 7 Fuses ...

Page 28: ...nk wire and connect in series as above see also Diagram C Fig 33 Live and Neutral connections to operate the clock motor must be taken from a suitable source Connector 11 Fig 32 is provided for connecting an optional integral time clock or programmer for fitting instructions please refer to those provided with the clock or page 28 of this manual Fig 33 CONNECTOR 12 ON PCB SEE FIG 32 13 Electrical ...

Page 29: ...ght hand side Fig 34 and pull out the 4 wires Fig 35 NOTE THE WIRES MAY BE TUCKED BEHIND THE ELECTRICAL COVER Connect the time clock wires as follows MECHANICAL MODEL Fig 36 Red Wire Contact 1 Black Wire Contact 2 Black Wire Contact 3 Grey Wire Contact 5 NOTE THE TWO BLACK WIRES ON CONTACTS 2 3 CAN BE REVERSED DIGITAL MODEL Fig 37 Red Wire Contact 1 Black Wire Contact 2 Grey Wire Contact 3 NOTE SE...

Page 30: ...n both cases the boiler connection is shown as ROOM which relates to the terminal on the PCB for external controls see 12 FIG 32 page 26 When connecting the boiler to an external cylinder do not run 240V cables and the cables for the ROOM terminal 12 Fig 32 page 26 together use separate cables to prevent induced voltage on the low voltage switching circuit NOTE THE USE OF A Y PLAN SYSTEM IS NOT PO...

Page 31: ...31 WIRING DIAGRAM FOR CONNECTION TO AN OPEN VENTED CYLINDER DIAGRAM B ...

Page 32: ...32 WIRING DIAGRAM FOR CONNECTION TO AN MTS UNVENTED CYLINDER DIAGRAM A ...

Page 33: ...as 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 therefore add to the thermal stress of the heat exchanger Demineralis...

Page 34: ...front case removed To convert from LPG G31 to Natural Gas G20 it is necessary to remove the diaphragm and restrictor from between the gas valve and air gas arm Once the conversion has been made the CO2 setting will need to be checked as described in Section 14 3 for NG the CO2 reading should be 9 2 0 2 with the front case fitted or 8 9 0 2 with the front case removed 14 6 Fitting the external sens...

Page 35: ... it is possible to establish a link between the external temperature and the flow temperature of the Central Heating system water This link translates into a thermal curve The type of curve should be chosen in correspondence with the planned temperature of the system and the nature of the heat loss present in the building To set up the external sensor proceed as follows 1 Access the settings menu ...

Page 36: ...boiler off by pressing the On Off button 26 Fig 1 to OFF disconnect the gas pressure gauge retighten the screw and relight the boiler 10 Re examine the central heating system and gas supply for soundness 11 If external controls have been disconnected reconnect and test 12 Refit the boiler casing 14 Commissioning and testing continued 14 10 Operational checks Fig 43 14 11 Instructing the end user 1...

Page 37: ...ls M Fig 45 Close the panel mounting clamps Fig 45 Screw in the clamp locking bolt A Note it is essential to refit the locking bolt A Central Heating Output kW 24 kW 30 kW 0 1 2 3 4 5 6 7 8 9 10 Steps Value P min P max Menu 4 10 12 14 16 18 20 22 24 26 28 30 10 12 5 15 17 5 20 22 5 25 27 5 30 32 5 35 8 9 6 11 2 12 8 14 4 16 17 6 19 2 20 8 22 4 24 35 kW Fig 44 Fig 45 14 Commissioning and testing co...

Page 38: ...t the burner has lit the boiler continues to regulate as follows The NTC fitted on the outlet of the primary circuit exchanger is the only NTC to adjust the heat output of the boiler according to the adjustable setting point This point is adjustable from 25 C to 85 C by the user This NTC relays information to the PCB which in turn modulates the burner by adjusting the speed of the fan When the NTC...

Page 39: ...he key to change between sections Note When you arrive at the last section of a menu pressing the key will move to the the 1st section When you are at the first section pressing the key will move to the last section of the menu Changing section in a menu available only for menu 3 and 4 Press the setting key to enter the modification mode The 3rd and 4th digits will begin flashing press the or keys...

Page 40: ...one default occurred 1 1 code from 01 to 99 1 code from 01 to 99 Last default occurred before the previous one 1 9 code from 01 to 99 Section Digit 1 Digit 2 Digits 3 and 4 Software version of display PCB 2 0 code from 01 to 99 Software version of main PCB 2 1 code from 01 to 99 Flue type 2 2 4 Condensation Room thermostat is calling for heat 2 3 0 No 1 Yes CH flow temperature in o C 2 7 from 01 t...

Page 41: ...41 once Section Digit 1 Digit 2 Digits 3 and 4 Thermostatic device 3 1 0 No 1 Yes Integral time clock 3 2 1 Fitted 2 Not Fitted Factory setting DISPLAY ACTION CONFIGURATION Menu 3 Boiler options x times ...

Page 42: ...un duration 4 2 0 to 5 min by step 0 5 min 4 3 Maximum Central Heating flow temperature 4 4 50 C to 80 C by steps of 1o C Minimum Central Heating flow temperature 4 5 25 C to 50 C by steps of 1o C 4 6 CH anti cycling delay 4 8 0 to 7 min by step 0 5 min CH maximum output limitation 4 9 Value from 0 to 10 Pmin Pmax general Menu 4 Boiler settings ...

Page 43: ...inutes if no keys are pressed Note As soon as the combustion rate control mode is on the Central Heating temperature control knob will become inactive DISPLAY ACTION CONFIGURATION 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 maxi bottom mini Gas output setting To modify...

Page 44: ...ot fitted factory setting 1 Active External Sensor fitted Thermal Curve see table D 6 2 0 3 0 5 1 1 2 1 5 2 2 5 3 Parallel Shift see table E 6 3 from 0 to 20 in steps of 1 In the event of connection of the external sensor you must 1 Activate the external senor menu 6 0 2 Activate the automatic heating adjustment menu 6 1 3 Select the correct thermal curve menu 6 2 4 Adjust the parallel shift menu ...

Page 45: ...he menu key three times to gain access to menu 4 the display shows 40 0 or 40 1 Change to section 8 CH anti cycling delay press the key eight times the display shows 48 2 5 factory setting 2 min 30 secs 4 menu 4 8 section 8 2 5 2 5 min 2 min 30 seconds Press the setting key once the 3rd and 4th digits flash together Then press the key to change the CH anti cycling delay the display shows 48 3 0 pr...

Page 46: ...uld be made via the flue sampling point see Section 14 3 steps 1 6 After servicing preliminary electrical system checks must be carried out to ensure electrical safety i e polarity earth continuity resistance to earth and short circuit All testing and maintenance operations on the boiler require the control panel to be lowered This will also require the removal of the casing 18 1 1 Removing the fr...

Page 47: ...ble in reverse order 3 Disconnect the detection electrode cable Fig 52 4 Remove the earth cable from the ignition electrode Fig 53 and remove the ignition electrode cable from the ignitor Fig 54 5 Unplug the gas valve and fan connectors Figs 55 and 56 6 Unscrew the 6 nuts D on the combustion chamber Fig 57 7 Unscrew the gas valve nut E Fig 58 Fig 51 Fig 52 Fig 53 Fig 54 Fig 55 Fig 56 Fig 57 Fig 58...

Page 48: ...sitioned correctly Fig 62 1 Carry out step 18 1 1 2 Remove the 2 screws G from the electrode manifold Fig 63 3 Pull the electrode from the combustion chamber Fig 64 4 Disconnect the detection elec trode cable Fig 65 5 Reassemble in reverse order 18 2 4 Removing the ignition electrode 1 Carry out step 18 1 1 2 Remove the earth cable from the electrode Fig 66 3 Remove the electrode cable H from the ...

Page 49: ...g the gas valve 1 Carry out step 18 1 1 2 Remove the air gas manifiold as in 18 2 1 Fig 72 3 Unscrew the three screws K on the air gas pipe and remove Fig 73 4 Unscrew the three screws L holding the gas valve on the venturi Fig 74 5 Remove the gas valve from the venturi Fig 75 6 Reassemble in reverse order 7 The CO2 settings will need to be checked and if necessary adjusted see Section 14 3 page 3...

Page 50: ... exchanger Fig 78 6 Remove the heat exchanger from the boiler by sliding it forwards Fig 79 7 Reassemble in reverse order 18 2 8 Removing the spark generator 1 Carry out step 18 1 1 2 Disconnect the earth cable from the ignition electrode Fig 80 3 Disconnect the ignition electrode live neutral and earth cables from the ignitor Fig 81 4 Remove the two screws N from the ignitor and remove Fig 82 5 R...

Page 51: ...relief valve 18 3 2 Removing the Central Heating return body 1 Carry out step 1 2 1 and 1 2 3 2 Remove the clip Q1 from the by pass tube Fig 84 3 Remove the clips Q2 and Q3 from the heating return and the pump Fig 85 86 4 Remove the two screws P1 Fig 84 5 Remove the Central Heating return body by pulling it toward you Fig 87 6 Reassemble in reverse order P1 Q3 Q2 Fig 83 Fig 86 Fig 87 Fig 84 Fig 85...

Page 52: ... 3 Removing the pump 1 Carry out step 18 1 1 2 Lower the electrical box cover as in step 18 1 2 3 Remove the PCB cover 4 Remove the pump plug from the control board and earth plug from the earth socket see Fig 88 Fig 88 Fig 89 Fig 90 Fig 91 S2 S3 6 Unscrew the pump nut see Fig 89 5 Remove the clip S2 on the pump volute see Fig 90 7 Pull the pump toward you and remove the clip S3 securing the press...

Page 53: ...he thermostat connections and remove the thermostat from the pipe by releasing its securing clip see Fig 95 18 3 7 Removing the temperature sensors N T C s 1 Remove the casing as in step 18 1 1 2 Pull off the NTC connections and remove the NTC from the pipe by releasing its securing clip see Fig 96 Fig 93 Fig 96 Fig 95 Fig 94 T U 5 Unscrew the nut U see Fig 94 6 Pull the expansion vessel toward yo...

Page 54: ...wo clips V and pulling the pressure gauge out see Fig 97 Fig 97 V 18 4 Access to the Control System 18 4 1 Removing the P C B s Fig 99 Fig 100 Fig 101 Fig 102 W2 W1 W3 3 Release the three clips W2 and remove the electrical box cover see Fig 100 1 Carry out steps 18 1 1 and 18 1 2 2 Remove the screw W1 from the electrical box see Fig 99 5 Remove all electrical connections from the display PCB see F...

Page 55: ...5 see Fig 104 Fit the correct EEPROM key when replacing the old PCB 9 Reassemble in reverse order 6 To remove the display PCB remove the two screw W4 and lift the PCB out see Fig 103 7 Reassemble in reverse order 18 5 Connecting the external sensor Fig 106 1 Access the main PCB as in step 18 4 1 2 Install the interface PCB supplied in the external sensor kit on the main PCB see Fig 106 3 Connect t...

Page 56: ...6 Anti freeze system pump and burner E 07 No water circulation in primary circuit E 08 No water in the primary circuit E 11 Flow sensor open circuit E 12 Flow sensor short circuit E 13 Return sensor open circuit E 14 Return sensor short circuit E 15 Outdoor sensor open circuit where fitted E 16 Outdoor sensor short circuit where fitted E 18 Flame lift E 20 Flame detected with gas valve off E 22 Fa...

Page 57: ...a few minutes Press the reset button 28 Fig 107 page 55 the red led will go out and the boiler will attempt to re light If the red indicator lights too frequently please call your local service centre Noises in CH system Air present in the CH system or insufficient pressure Purge the system of air and increase the system pressure Section 2 page 6 Radiators rise in temperature During summer season ...

Page 58: ... 14 Carry out a general inspection of the boiler 15 Check the flue and termination point 16 Remove any oxide from the detection electrode by using an emery cloth 21 2 Cleaning the primary exchanger Cleaning the exhaust side Remove the air gas assembly Section 18 2 1 Check that the exhaust passages are free if there are deposits present clean the exchanger with compressed air or wash with water or ...

Page 59: ...5 Following inspection 3 disassemble and clean the combustion chamber as necessary 6 Following inspection 4 disassemble and clean the injector if necessary 7 Clean the primary heat exchanger see Section 21 2 8 Check and adjust the CO2 emissions as necessary see Section 14 3 9 Check the correct operation of the heating safety devices Overheat thermostat 10 Check the correct operation of the low wat...

Page 60: ...mm 4 4 4 8 Adjustable heating outlet temperature C 25 to 85 25 to 85 Central heating minimum flow rate l h 300 300 Central heating circuit maximum pressure Pw max bar 3 3 Central heating expansion vessel capacity L 6 8 Expansion vessel inflation pressure bar 0 7 0 7 Electric voltage 230 volt single phase 50 Hz 230 volt single phase 50 Hz Electrical input power W 150 150 Electrical protection IP 44...

Page 61: ...61 24 Benchmark Commissioning Checklist ...

Page 62: ...62 25 Service Interval Record ...

Page 63: ...63 ...

Page 64: ...ssumed 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 guarantee and should an MTS engineer be required to attend and no pro...

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