Morco FEB-24ED Page 55 Technical Documentation Manual Download

Page: 55 / 56

Description of functioning

t e c h n i c a l

Electrical Circuit diagrams: FEB-24ED

1.- Mains connection

(230v ac)

2.- Earth

3- Fan

(230v ac)

4.- Pump

(230v ac)

5.- Ignition

(230v ac)

6.-

Gas valve

solenoid 1

(230v ac)

7.-

Gas valve

solenoid 2

(230v ac)

8.- Front panel control

9.- 3 way valve

micro switch

10.- Air pressure switch

11.- Room stat (optional)

12.- Clock connection

13.- Modulating solenoid valve

14.-

Ionisation electrode

15.- High limit stat

16.-

DHW

thermistor

17.- Central Heating thermistor

18.-

CH low

Pressure switch

19.- External Probe

20.- Clock

(230 v ac)

Summary of Contents for FEB-24ED

Page 1: ...FEB 24ED TECHNICAL DOCUMENTATION 01 12 08 version 1 0 ...

Page 2: ...Photograph 9 3 1 3 Gas Circuit 14 3 1 4 Air circuit 18 3 2 External auto test functions 19 3 3 On board auto test functions and boiler configuration set up 26 3 4 Trouble shooting lock out codes 32 3 5 Trouble shooting Flow charts 36 3 6 Assembly and disassembly hydraulic unit 44 3 7 Functional flow charts 47 3 8 PCB Schematic drawing 53 ...

Page 3: ...ance with gas installation regulations Boiler installation must comply with the conditions described by in the user and installation manual provided with the appliance I Important Please read the user and installation manual for this boiler carefully 1 PLEASE NOTE THAT THE FAULT CODES AND SOFTWARE DIFFER FROM THE FEB24E FAULT CODES ALWAYS USE THIS MANUAL FOR FAULT FINDING AND TROUBLE SHOOTING ON T...

Page 4: ...between 7 6 kW and 23 7 kW 6 536 and 20 382 Kcal h FEB 24ED 1 3 5 7 8 9 4 6 2 12 10 16 15 13 11 14 1 Central heating thermistor 2 Air pressure switch 3 Fan 4 High limit stat 5 Copper heat exchanger 6 Expansion vessel 7 Combustion chamber 8 Ionisation electrode 9 Ignition electrodes 10 Circulation Pump with Automatic Air Vent 11 Modulating gas valve 12 Hydraulic assembly 13 DHW thermistor 14 Safety...

Page 5: ...W activation 0 3 Expansion vessel capacity L 7 Temperature selection range ºC Central heating circuit Floor Heating 40 60 Radiators 60 85 D H W circuit 35 60 Gas inlet pressure mbar Natural G20 20 Propane G31 37 Gas consumption Hi Natural G20 m h 2 78 Propane G31 kg h 2 1 Electrical suplly V Hz 220 230V 50Hz Max power consumption W 120 Dimensions mm Height 680 Width 390 Depth 250 Connections Inter...

Page 6: ...p 3 Low pressure switch 4 Central heating thermistor 5 Three way valve 6 High limit stat 7 Air pressure switch 8 Venturi 9 Fan 10 Sealed air box 11 Copper heat exchanger 12 Combustion chamber 13 Ignition electrodes 14 Main burner 15 Ionisation electrode 16 Modulating gas valve 17 Gas inlet 18 D H W Thermistor 19 Hot water outlet 20 Plate heat exchanger 21 C H Flow 22 Cold water inlet 23 C H Return...

Page 7: ...age from the installation or boiler Check all the con nections thoroughly Domestic Hot Water Functioning DHW Water begins to circulate through the domestic circuit of the boiler The cold water flows through the 3 way valve this action ports the 3 way valve and micro switch into DHW mode Water heated in the primary circuit flows through the plate heat exchanger to heat up the water coming from cold...

Page 8: ...6 2 3 4 1 Pump 4 Plate heat exchanger 7 DHW Thermistor 2 Pressure relief valve 5 Three way valve 3 Draining valve 6 Automatic air vent Circulating pump head Part number MCB3050 Operates in both CH and DHW mode Circulation of the primary circuit either to the radiators or to the plate heat exchanger when operating in DHW mode Pump combines a manual and automatic anti blocking system The capacity of...

Page 9: ...rass diaphragm housing Activation ocours when the white switch tip which sits on the diaphragm push rod in CH mode is released as the diaphragm push rod ports the 3 way valve to DHW This action places the PCB into DHW mode allowing the boiler to commence the ignition sequence Part number MCB2320 Flow restrictor Located within the hydraulic unit between the brass inlet union and the cold inlet port...

Page 10: ...circuit Automatic bypass The bypass is located inside the hydraulic unit It joins the heating outlet and return It is preset only opening when the pressure between the bypass inlet and outlet exceed 0 3 b Its purpose is to assist when there is a large loss of load in the circuit and the pump consequently has difficulty in moving the water When the bypass opens an amount of water which was flowing ...

Page 11: ...URE SWITCH 14 J6 DHW AND HEATING THERMISTORS ROOM THERMOSTAT EXTERNAL PROBE 15 J22 OR J23 DISPLAY PCB CONNECTOR 3 PURPLE WIRES 16 J16 MODULATING GAS VALVE 18VDC 17 J27 PORT FOR SOTWARE PROGRAM 18 AUTO TEST PORT 19 SUPPRESSION FILTER 20 SUPPRESSION FILTER 21 MAIN ELECTRICAL SUPPLY CONECTORS 230V 50Hz 9 J22 J18 J17 J25 N N L L L L N N L FAN 230V ac PUMP 230V ac MAINS SUPPLY 230Vac 18 GAS VALVE EV1 2...

Page 12: ... if the temperature is lower than 3 degrees the burner will relight Pump Antiblock safety Keep fit If during during the last 23 hours the pump has not run the PCB will run the pump for 30 seconds Overheating If the heating thermistor detects a lower tempera ture than 50ºC and there is a higher output than 95 after 5 minutes the boiler will shut down then relight Fuzzy logic This program operates o...

Page 13: ...r starts to work in ON OFF cycling mode While the boiler is in ON OFF mode the boiler starts at least 8 seconds and stops working for at least 4 seconds and always working at the minimum power The boiler comes out of this ON OFF mode when DHW temperature is lower than DHW set point 4º C or when DHW temperature is lower than DHW set point during more than 45 seconds and the boiler begins to regulat...

Page 14: ...l lock out F4 block The thermostat resets automatically although the F4 fault will need resetting from the control panel Thermistors There are two thermistors incorporated to the boiler The DHW thermistor is screwed into the 3 way valve at the hot water outlet and is in direct contact with the hot water exiting the boiler Part number FCB1080 faulty or out of range thermistors will cause the boiler...

Page 15: ...rking range is entered In case DHW is working the boiler continues work even if the led displays fault The boiler uses the heating thermistor to regulate DHW temperature Relation between Temperature Voltage and Thermistor nominal Resistance Temperature ºC Voltage Volts Resistance k 85 0 92 1 44 80 1 01 1 65 75 1 15 1 91 70 1 28 2 21 65 1 41 2 57 60 1 54 2 99 55 1 71 3 51 50 1 93 4 13 45 2 13 4 87 ...

Page 16: ... Burner pressure can also be tested at the inlet pipe to the burner Spark generator A B This component has 2 functions the 1st is to create a high tension voltage at the spark electrodes The unit also provides a connection for the 230v ac from the PCB to the twin gas valve solenoids EV1 EV2 Part number MCB3055 Gas pressure modulation This is a progressive modulation type boiler i e it automaticall...

Page 17: ...elected step And it is pushed the main board button when a new value wanted to be stored then the display shows to indicate that the value has being stored To leave installation menu it can move the right knob back to the O position These are the 7 Installation Menu s Steps Step 1 Select gas type The display shows P1 and the value selected 6n or LP 6n is for Natural Gas and LP for propane butane W...

Page 18: ...iator or SU floor heating Using right knob CH RA radiators or SU floor heating can be selected In case floor heating SU is selected the set point must be stored Using the right knob CH it can be selected the value between 40 and 60 ªC and using the main board button the value will be stored and the display will show again to indicate that the value has being stored When this option SU is chosen th...

Page 19: ...should be equal or lower never higher For example if you are making a maximum natural gas regulation the table says 18 0mb so you achieve 18 0 mb or less than 18 0mb I Changing the gas This boiler is designed to function using PROPANE GAS or NATURAL GAS GAS To change the type of gas used the only com ponents that need to be changed are the injec tors The injectors corresponding to the gas to be us...

Page 20: ... at a differential pressure of 140Pa 1 4 mb and deactivated at 89Pa 89 mb To measure the differential pressure first measure the pressure using the water co lumn in one of the Venturi gauges and then with the water column in the other The result will be the sum total of both This data is to be taken as an approximate value only as variations of a few Pascals occur in the measurements while the fan...

Page 21: ...s must be used ON OFF Shows boiler status WINTER Adjust boiler parameters AUTOTEST Comfort Configure the boiler Showing boiler status The symbols from the top of the display show the actual state of the different inputs outputs and with both 7 segment displays show set points temperatures water flow pressure and power of the boiler The values of visualization are shown in groups of two and using t...

Page 22: ... D H W Set point and temperature tap symbol Central Heating set point and temperature radiator symbol D H W Temperature ºC and gas valve power D H W Temperature and Central Heating Temperature tap and radiator symbol Water flow and pressure symbols l min y bar NOT AVAILABLE ON FEB24ED 20 ...

Page 23: ... shows P1 Light button When pressed display shows D H W Temperature and C H Temperature D H W set point increase button Pump ON OFF D H W set point decrease button Change 3 way valve Step 2 Switch ON OFF the fan and sparks system The display shows P2 Light button When pressed display shows D H W Temperature and C H Temperature D H W set point increase button Fan ON OFF D H W set point decrease but...

Page 24: ... Limited between 20 and 55 Step 5 Start up Pressure Regulation Display shows P5 and electrical value To adjust this value use the same instructions that are used in Step 3 Limited between 20 and 60 Step 6 Check the boiler operation sets the DHW temperature to 42ºC Display shows P6 No action possible in this step Pushing light button DHW tempe rature and hundred percent value of the gas valve are s...

Page 25: ...pressure switch the boiler will be 00 and if the boiler uses water pressure sensor digital pressure gauge the boiler will be 04 Second 2 digits are explained in following tables First Number from YY Heating Circuit Type CA Heating Plumb Delay Tpb Plumb Cycling PC rA SU 1min 2 99min OFF ON 0 x x x 1 x x x 2 x x x 3 x x x 4 x x x 5 x x x 6 x x x 7 x x x 23 ...

Page 26: ... of boiler From 00 to 03 means that the boiler has water pressure switch and if its from 04 to 13 the boiler has water pressure sensor To store the selected value use the comfort button Step 4 Type of heating circuit radiators or floor heating The display will show CA as it s shown in the picture and the selected option RA radiator or SU floor hea ting Using increase decrease CH set point buttons ...

Page 27: ...t point until 99 minutes To store the selected value use the comfort push button Step 7 Pumb Cycling Display shows PC and On or OF depending on the state of the pump cycling function Select the desired value using increase decrease CH se point buttons and store it with the comfort push button When the boiler is working in central heating function at a high temperature if a tap is opened very hot w...

Page 28: ...ng in hours h days d or weeks w Step 14 State of manufacture EF XX Step 15 Main board software version i e CC 1 1 Step 16 Front panel control software version i e CP 2 3 HEATING SELECTION WITHOUT EXTERNAL AUTO TEST 26 Selection of heating mode radiators under floor heating The boiler can be configured for either heating radiators rA or under floor heating SU 2 configuration methods are available v...

Page 29: ...switched on it shows the selected value in the display for a few seconds if the heating circuit is radiator it will show rA and if the hea tingcircuit is floor heating it will show SU Adjusting boiler s parameters AUTOTEST To enter in the AUTOTEST function menu both knobs must be place to minimum to the left DHW knob in O position and CH knob in summer position and then push the main board button ...

Page 30: ...in board button then the display shows to indi cate that the value has being stored The electri cal value is limited from 20 to 55 LPG VALUE 46 Step 5 Start up Pressure Regulation Dis play shows t5 and the electrical value alternately When the right knob CH is in summer position the display shows the stored value and turning clockwise the right knob the selected value can be changed Once it s sele...

Page 31: ...of the selected step And must be pushed the main board button when a new value wanted to be stored then the display shows to indicate that the value has being stored To leave Configuration menu it can move the right knob out of O position and taking it back to the O position These are the different Configuration Steps Step 1 Main Configuration Viewer It can not be modified Alternately shows in the...

Page 32: ... alternately ti and the number of the type of boiler selected If the value stored is 00 to 03 means that the boiler has presotat and if the value is 04 to 08 means that it has pressure sensor With the right knob at the summer position the value stored is shown and using this knob we can select the desired va lue to store it just push the main board button and will be displayed meaning that the val...

Page 33: ...e the selected value use the main board push button Step 7 Pump Cycling Display shows alterna tively PC and On or OF when right knob is in summer position depending on the state of the pump cycling function Select the desired value using right knob CH and store it with the main board push button When the boiler is working in central heating mode at high temperature if a hot tap is opened the initi...

Page 34: ...n electrode fails to detect a flame the boiler will lock out F1 locked When the boiler is working and the flame fails due to a malfunction of the gas valve or ionisation electrode after 1 second without flame detection the boiler will shut down gas valves The boiler will then attempt to relight if no flame is detected the boiler will lock out F1 lapoouuuuuuuuuuuuuuuuuuuuufdfd no oiuuuuuuuuuuuuuuAC...

Page 35: ...e venturi Faulty PCB F03 If the heating circuit s pressure falls below 0 5 b or the central heating low pressure switch fails contacts open the boiler locks out F31 OR 32 HISTORICAL FAULTS F04 If the high limit thermostat activates at 102ºC or fails contacts open the boiler locks out F05 If there is any failure in the software protections of the boiler control program the boiler gets locked The us...

Page 36: ...ted If this fault ocours the heating mode will work normally and the DHW mode will also work but using the heating thermistor as reference to heat the DHW This fault will auto reset when the thermistor is in range F13 It s a failure of the heating thermistor that it is out of range open or short circuited If this fault occurs the boiler blocks This fault auto reset when the thermistor returns with...

Page 37: ...pen prior to the start up and fail to close afer 6 minutes then lock out will ocour after a maximun time of 6 minutes if the contacts remain open F22 F 31 Fault on water circuit of the boiler The heating circuit is empty or the pressure detec ted is lower than 0 5 bar F 32 Fault on water circuit of the boiler The central low heating pressure switch is faulty or disconnected F 51 F 52 F 53 F 54 F 5...

Page 38: ...tly Go to 1 OUT Yes No No No No No No No No No No Heating Works DEMANDYes Go to 2 Go to 3 Go to 5 Go to 6 Go to 7 Go to 8 Makes noise Go to 4A Go to 4B D H W Works Heating Works Pump Works Sparks at electrode Spark works but no flame or flame fails after ignition Fan Works FEB 24ED DISPLAY ON 36 ...

Page 39: ...knob in Position ON Put There are 230 VAC in connectors J12 J13 5 VDC in connector J26 between extreme pins Check electrical connection Mains cable Replace main PCB Check the wiring and connections between main control circuit and front panel circuit if it is OK replace the front control PCB TURN IT ON 37 ...

Page 40: ...he main control circuit No Check Room Thermostat connections and select heating enought temperature IN No Yes Yes OUT There are 2l min at the opened tap Does the 3 way valve connector turns off j7 wires blue brown Check the wiring and connections if it is OK replace the front panel circuit or main control circuit Check the filter 3 way valve operating water presure No Check wiring and connection o...

Page 41: ...se contacts closed black wires Check wiring and conections if it is OK replace the main control circuit Replace air pressure switch connections or pressure switch Yes There are 230 Vac in J18 wires blue brown No Check wiring and connections if it is OK replace the main control circuit Unseize the pump impelor or replace the pump 39 Check the connections at the PCB if all OK then replace the main P...

Page 42: ...ial at the air pressure swich 230 Vac on J25 wires brown blue Take off the wires of t Replace main PCB R Check the wiring and connections if it is OK replace the ignition electrode Check the venturi and the flue air intake pipes Check the pressure switch connections P P connections If it s OK replace the air pressure switch Remove wires from spark gen erator is there are spark 40 Replace spark gen...

Page 43: ...ut locking out Replace front control panel PCB Replace solenoids EV1 EV2 or spark generator as required Replace the gas valve adjust the new valve to the correct gas pressures Check the ignition pressure 8 0mbar if ok check all the main burner jets for blockages boiler works Simulate the ionisation signal with a diode or replace ionisation electrode Boiler works Check the min burner pressure remov...

Page 44: ...int Regulate mechanically and electricaly the gas valve Check gas valve regulation and electrical values of configuration in AUTOTESTIt s OK Check water pressure or check 230Vac on J17 Yes Yes Heating modulates correcty Always at minimum Check SU RA OK Check heating electrical value OK Thermistor values are OK Always Same Set Point Replace Main Control Circuit Regulate minimum Configure main contr...

Page 45: ...ting installation Set the pump to no 2 speed Check the heating circuit pressure check by pass and check the pump works in 3rd position Sound of boiling water in the heat exchanger Sound of water in the DHW installation T filling tap of the in Fit air restrictor in tha air intake if is necesary NO GAS WATER Check the minimum burner pressure Reduce the cold water mains pressure 43 ...

Page 46: ...t pipe 2 from the hydraulic unit Remove the pressure sensor from the heating return pipe for ease of handling Remove the heating outlet pipe 3 from the main heat exchanger for ease of handling Remove the screws holding the hydraulic unit to the boiler base they are on the underside Release the hydraulic unit from the lower connectors DHW inlet and outlet and heating inlet and outlet The water inta...

Page 47: ...or ease of handling Remove the screws holding unit 1 to the boiler base they are on the underside Release unit 1 from the lower connectors DHW inlet and outlet and heating outlet The water intake connectors do not need to be removed Changing the plate heat exchanger Remove the four screws holding the plate heat exchanger to unit 1 be very careful with the O rings they should be changed Changing th...

Page 48: ...anging the drain valve Drain the heating circuit Remove the pump and remove the clip holding the drain valve in place Changing the safety valve and drain valve Safety valve or drain valve 2 and 3 1 Drain the heating circuit 2 Remove the clip and pull out the valve Changing the DHW thermistor Changing the DHW thermistor Drain the DHW circuit Remove the thermistor from its location and reuse the exi...

Page 49: ...T SEQUENCE DHW MODULATION Wait until Heating temperature goes down FAN ON PUMP OFF Lock out F 3 3 Min Lock out F 2 FAN OFF PUMP OFF 6 Min Lock out F 2 FAN OFF PUMP OFF Flame detection before 6 seconds Open EV1 and EV2 Open gas valve at lighting pressure SPARK MAX 6 SECS Heating Temp DHW set point 20º C Heating Temp DHW set point 20º C PUMP ON Air pressure switch closes FAN ON Air pressure switch o...

Page 50: ... Lock out F 2 FAN OFF PUMP OFF 6 Min Lock out F 2 FAN OFF PUMP OFF Flame detection within 6 seconds Open EV1 and EV2 Open gas valve at Inigtion pressure SPARK Maximun 6 seconds Air pressure swich closed FAN ON Air pressure switch opened Heating temperature Heating Set Point 5ºC Heating temperature Heating Set Point 5ºC PUMP ON PUMP ON Heating start sequence FEB 24ED 48 ...

Page 51: ...n before 6 seconds Open EV1 and EV2 Open gas valve at lighting pressure SPARK Maximun 6 seconds FAN 5 SEC ON PUMP ON GAS VALVE CLOSED SPARK OFF Flame detection before 6 seconds FAN 5 SEC ON PUMP ON Open EV1 and EV2 Open gas valve at lighting pressure SPARK Maximun 6 seconds HEATING OR DHW MODULATION BURNER OFF FAN 7 SEC ON PUMP OFF RE start sequence FEB 24ED 49 ...

Page 52: ...oint 4ºC 15 sec or DHW Temp DHW Set point 8ºC DHW Temp DHW Set Point HEATING DEMAND Heating Temp 102ºC LOCK OUT F 4 PUMP 1MIN ON FAN OFF BURNER OFF END OF DHW DEMAND HEATING MODULATION FAN 5 SEC ON PUMP OFF BURNER OFF PUMP CYCLING ON Heating Temp 92ºC FAN ON PUMP ON 10sg OFF 1sg BURNER OFF PUMP ON BURNER OFF Heating Temp 88ºC Heating Temp 92ºC Heating thermistor in range MODULATION DHW Temperature...

Page 53: ... CYLING next page Heating Temp 102ºC FAN 5s ON PUMP ON BURNER OFF LOCK OUT F 4 PUMP 1MIN ON FAN OFF BURNER OFF DHW DEMAND FAN 5 SFC ON PUMP ON during Tpb BURNER OFF END OF DHW DEMAND Heating Temp heating Set Point 5ºC PUMP ON FAN ON PUMP ON 10s OFF 1s BURNER OFF Heating Temp 92ºC Heating Temp 92ºC 30 second minimum power FUZZY LOGIC 5 min Minimum power YES YES YES YES YES 51 YES HEATING SERVICE FE...

Page 54: ...AN ON PUMP ON DHW DEMAND BURNER ON FAN ON PUMP ON DHW MODULATION DHW Temperature Heating working BURNER ON FAN ON PUMP ON DHW DEMAND Heating Temp DHW Set Point 20ºC BURNER OFF FAN ON PUMP CYCLING Heating Temp DHW Set Point 20ºC BURNER ON FAN ON PUMP ON DHW MODULATION DHW Temperature Pump Cycling OFF Pump Cycling ON NO YES 52 ...

Page 55: ...1 230v ac 7 Gas valve solenoid 2 230v ac 8 Front panel control 9 3 way valve micro switch 10 Air pressure switch 11 Room stat optional 12 Clock connection 13 Modulating solenoid valve 14 Ionisation electrode 15 High limit stat 16 DHW thermistor 17 Central Heating thermistor 18 CH low Pressure switch 19 External Probe 20 Clock 230 v ac 53 1 7 5 6 4 3 13 14 9 10 15 18 19 17 16 11 8 2 12 20 ...

Page 56: ...RODUCTS LTD Morco House Riverview Road Beverley East Yorkshire HU17 OLD Sales Telephone 01482 325456 Technical Helpline 01482 386586 Fax 01482 212869 email sales morcoproducts co uk web www morcoproducts co uk ...

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