Unical CoR C24, Installation And Servicing Manual

Page 1: ...R 24 C 24 CoR INSTALLATION AND SERVICING MANUAL E N G L I S H 0 1 2 3 4 bar MAX M I N MAX MIN bar service CoR ...

Page 2: ...e It can be taken to a special recycling centre managed by the local authorities or to a dealer who offers this service Separate disposal of a domestic appliance avoids possible negative consequences for the environment and human health deriving from inappropriate waste handling and allows the recovery of the materials of which it is made in order to obtain significant energy and resource savings ...

Page 3: ...treatment 8 1 8 Boiler antifreeze protection 9 Attention this manual contains instructions for the exclusive use of the professionally qualified installer and or maintenance technician in compliance with current legislation The user is NOT qualified to intervene on the boiler The manufacturer will not be held liable in case of damage to persons animals or objects resulting from failure to comply w...

Page 4: ...it was expressly designed Any other use is to be considered improper and therefore dangerous 1 1 general warnings The instruction booklet is an integral and essential part of the product and must be kept by the user Read the warnings contained in this instruction booklet carefully as they provide important guidelines regarding installation use and maintenance safety Keep the booklet with care for ...

Page 5: ...user as well as other documents concerning the appliance inserted in the envelope inside the packaging The user must keep this documentation safe for future consultation Inform the user about the importance of the air vents and the flue gas exhaust system high lighting their essential features and the absolute prohibition of modifying them Inform the user concerning controlling the system s water ...

Page 6: ...ch affect the operating safety of the appliance Attention To tighten or loosen the screwed fittings use only appropriate fixed spanners Incompliant use and or inappropriate tools can cause damage e g water or gas leakage ATTENTION Indications for propane gas fired appliances Make sure that the gas tank has been deaerated before installing the appliance For state of the art tank venting contact the...

Page 7: ...cording to EN 625 EN 13203 1 19 PMW Max domestic hot water operating pressure 20 T max Max domestic hot water temperature C Electrical characteristics 21 Electrical power supply 22 Consumption 23 Protection rating D Countries of destination 24 Direct and indirect countries of destination 25 Gas category 26 Supply pressure E Factory settings 27 Adjusted for gas type X 28 Space for national brands G...

Page 8: ...ation of fouling or by cor rosive water will not be covered by the warranty 1 7 WATER TREATMENT The treatment of the supply water allows to prevent inconveniences and maintain the functionality and efficiency of the generator over time The ideal water pH in heating systems must be within To minimise corrosion it is crucial to use a corrosion inhibitor in order for it to work properly the metal sur...

Page 9: ...n only po sition the two knobs as shown in the figure The Antifreeze protection is always active Even by disabling the heating and domestic hot water services MAX M I N MAX MIN 1 8 BOILER ANTIFREEZE PROTECTION This protection can intervene only if the electricity and gas supplies are connected If one of the two is not available and upon reset 11 SR a temperature of 2 C is detected the appliance wi...

Page 10: ...K Water deficiency pressure switch CoR C24 15 Filling valve 16 Diverter valve 17 Plate heat exchanger 18 FL FH VM Fan 19 TDPA Air pressure transducer 20 Safety valve 22 SRR Return temperature sensor 23 HL TL2 Smoke safety thermostat 24 Mono exchanger 26 Condensation drain trap 2 TECHNICAL FEATURES AND DIMENSIONS 2 1 TECHNICAL FEATURES 2 2 VIEW WITH THE INDICATION OF THE MAIN COMPONENTS AND DIMENSI...

Page 11: ...er inlet G M Heating system flow G R Heating system return G Rc Filling valve Sc Boiler drain Svs Safety valve drain Scond Condensation drain C E ERROR CODES see par 4 6 S E WIRING DIAGRAM KEY see par 4 5 345 0 1 2 3 4 bar MAX M I N MAX MIN bar service 700 420 CoR C24 125 205 225 125 8 131 70 61 130 60 56 43 207 247 C F G R M Svs Rc Scond Sc 67 View from above View from below ...

Page 12: ...12 Flow rate l h Avaible Head mH 2 O 2 3 DIAGRAM OF FLOW RATE PRESSURE AVAILABLE FOR INSTALLATION ...

Page 13: ... operated with Nat Gas G20 Description Symbol Unit CoR R24 C24 Nominal Heat Output Pnominal kW 24 Seasonal space heating energy efficiency ƞs 86 Seasonal efficiency class in heating mode B For CH only and combination boilers useful heat output Useful Heat Output in high tempera ture regime Tr 60 C Tm 80 C P4 kW 23 8 Useful efficiency at nom heat output in high temperature regime Tr 60 C Tm 80 C ƞ4...

Page 14: ...stic hot water circuit pressure bar 0 5 Maximum domestic hot water circuit pressure bar 6 Domestic hot water specific flow rate t 30 C D l min 11 5 Production of D H W in continuous operation with t 45 K l min 7 4 Production of D H W in continuous operation with t 40 K l min 8 3 Production of D H W in continuous operation with t 35 K l min 9 5 Production of D H W in continuous operation with t 30 ...

Page 15: ...allation room the appliance must be protected suitably and must be able to operate independently from the air in the room Attention Only mount the appliance on a closed wall made of non flammable materi al flat vertical so that the minimum distances required for installation and maintenance can be observed The boiler must be connected to a cen tral heating system and or domestic hot water supply n...

Page 16: ...s animals or ob jects due to failure to comply with the instruction above H P L As well as the appliance the packaging contains A DOCUMENTATION ENVELOPE User operating instructions booklet Instruction booklet for the installer and maintenance engineer 2 Spare parts form Certificate of conformity Siphon with corrugated pipe and fixing strap inside the boiler 2 1 3 4 PACKAGING P depth L width H heig...

Page 17: ...nstalled on a vertical and solid wall which can support its weight The wall must not be made of flammable material Since the temperature of the wall on which the boil er is installed and the temperature of the coaxial exhaust pipe do not exceed in normal operating conditions a room temperature beyond 60 K it is not necessary to observe the minimum distances from flammable walls For boilers with do...

Page 18: ...18 33 702 0 1 2 3 4 bar MAX M I N MAX MIN bar service CoR 420 61 70 79 43 51 56 60 4 C F G R M 125 100 Ø80 Ø80 Ø100 Ø80 765 125 125 3 5 1 REFERENCES FOR BOILER POSITIONING ...

Page 19: ...or rear outputs coaxial with socket and bend references for outputs with double pipes Ø 80 references for rear outputs with double pipes and bends Ø 80 kit b reference hydraulic outputs for installation with pipe kit 00362526 SVS Scond 250 distance from the wall drain safety valve condensate drain ...

Page 20: ... 500 Horizontal exhaust and intake terminals directed outside via coaxial or double pipes C33x C33 TOTAL LENGTH LA intake L Exhaust COAXIAL Ø60 100 DOUBLE Ø80 FROM m TO m FROM m TO m 1 6 1 1 25 13A 12S COAXIAL Ø80 125 DOUBLE Ø60 FROM m TO m FROM m TO m 1 8 NA NA ertical exhaust and intake terminals directed out side via coaxial or double pipes C53x C53 C53 NOT ALLOWED C53 TOTAL LENGTH LA intake L ...

Page 21: ...s in the MT013 available on the website ATTENTION For the type of connection B23P the room follows the same installation rules for boilers with natural draught Please note these values relate to exhausts made by means of rigid pipes and smooth original UNICAL C83x C83 Connection to a terminal for combustion air intake and flue gas exhaust via a single or collective chimney C93x C93 Air flue gas th...

Page 22: ...t pipes The supplier will have no contractual or extra contractual liability for damage caused due to incorrect installation and use and in any case failure to comply with the instructions provided by the manufacturer Coaxial start Installation Type B22 for outdoor installation KIT A coaxial Ø 100 60 00364813 KIT B sdoppiato Ø 80 00364891 Adapter for double systems 00364817 00364815 00363307 20 mm...

Page 23: ...ho must re spect and apply that foreseen by relevant laws in force in the local prescriptions of the supply company Incorrect installation can cause damage to persons animals and objects for which the manufacturer cannot be held responsible If you smell gas a Do not operate electric switches the telephone or any other object that may cause sparks b Immediately open doors and windows to create air ...

Page 24: ...ctions are watertight after commissioning the boiler see par 3 10 and bringing the system to the operating temperature stop the boiler and repeat the air bleed operations let the system cool down and if necessary return the water pressure to 0 8 1 bar See par 4 4 When the system connections have been completed the circuit can be filled This operation must be performed carefully respect ing the fol...

Page 25: ...ther mostat wires between terminals TA 2 Connect the modulating thermostat wire between terminals TA1 OT after having removed the jumper ON OFF room thermostat connection RT OT Danger Only a qualified technician may per form the electrical installation Before performing connections or 3 9 ELECTRICAL CONNECTIONS any type of operation on electrical parts always disconnect electrical power and make s...

Page 26: ...boiler installation requires electric al con nection to the mains power supply This connection must be made up to standard as required the regulations in force Remember that a bipolar switch must be nstalled on the boiler power line with over 3 mm between contacts easy to access making maintenance quick and safe The power cable must be replaced by technical personnel authorised by UNI CALAG S p A ...

Page 27: ...essure on the pressure gauge with the pump stopped are any system shut off gate valves open does the gas to be used correspond to the boiler calibration gas otherwise perform the boiler conversion in order to use the gas available see section 4 3 this operation must be carried out by technical staff qualified in compliance with the standards in force is the gas supply valve open has the system bee...

Page 28: ...aximum output 1 lluminated symbol When the high flame symbol is fixed on the display and there is an alternation between SP and flow temperature the boiler operates at maximum power Make combustion efficiency 4 DISABLING The calibration function stays active for 15 min utes To disable the CALIBRATION function before the time elapses press the button D for 5 seconds until the SERVICE symbol appears...

Page 29: ...e gas temperature and content of CO2 taken in the relevant hole 2 Take the measurements with the generator in steady state conditions see par 3 11 1 3 11 2 Posizionamento delle sonde C pipes Ø 80 type B22 Flue gas probe Air probe 1 B separate pipe Flue gas probe Air probe 2 A Coxial pipes 1 Flue gas probe Air probe 2 N B Insert smoke probe only after ignition of the burner in order to avoid the sa...

Page 30: ...the pressure socket screw again Check that there are no gas leaks 2 Regolazione alla potenza minima Operate the boiler in calibration mode at MIN MUM OUTPUT see 3 11 1 Once the burner is on check that the MINIMUM pressure value corresponds to that indicated in the table NOZZLES PRESSURE Should it not correspond correct it see calibration procedure Cap 4 4 All boilers leave the factory already cali...

Page 31: ...r range accettabile per G 20 0 2 mbar range accettabile per G31 ATTENTION Function reserved for Authorised Assistance Centres only The user is NOT authorised to activate the function described below 3 12 1 ADAPTATION OF THE POWER TO THE HEATING SYSTEM Ex CoR 24 to depower the boiler 20 kW modify parameter HP about 70 kW 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 ...

Page 32: ...r inlet valve if closed previously Vent and if necessary restore the heating pres sure until reaching a pressure of 0 8 1 0 bar Open the gas shut off valve Switch the boiler on Make sure the appliance is gas tight and water tight Remount the front casing of the appliance Failure to perform Inspections and Main tenance can entail material and personal damage TABLE OF RESISTANCE VALUES ACCORDING TO ...

Page 33: ... boiler in safety conditions when overheating Heat the TL until it intervenes and check that it intervenes DK safety pressure switch against water deficiency 13 Does the pressure switch block the boiler if the water pressure is below 0 4 bar Without request close the shut off valves of the heating circuit open the drain valve to make the water pressure decrease Before pressurising again check the ...

Page 34: ...if there is no external probe or if it is faulty dS Domestic hot water temperature if there is no sensor or if it is faulty rS Return temperature if there is no auxiliary sensor or if it is faulty dt Differential t between flow and return ICH Heating temperature calculated been room zone ON OFF and remote zone OT FP Air Fan signal pressure Pa PH Water pressure is there is not pres sure sensor is d...

Page 35: ...the position 01 in which the error is stored DISPLAY Turn knob B to display the sequence of faults between 01 12 EDIT VALUE RESET Enter the error string H01 keep press reset D until the display shows INF o reset the whole errors log This operation must only be performed in the event one wants to delete the log completely for example if important updates are made it may therefore be useful to have ...

Page 36: ...ile 0 20 C 30 10 C default 10 nr 0 5 30 Night reduction 0 T A default 5 30 night reduction PH 0 1 Domestic hot water pre heat function 0 Not active default 1 Active HP 0 100 Maximum heating modula tion level default 100 HL 20 50 Minimum heating set point level default 30 HH 50 85 Maximum heating set point level default 85 dL 25 45 Minimum domestic hot water set point level default 35 dH 50 65 Maxi...

Page 37: ...er ential SP 0 6 Pump pause time during CH DHW service change and vice versa 0 no pause 1 6 Time in seconds AP 1 4 1 Instantaneous boiler 2 Instantaneous boilers with fixed hysteresis 3 Heat only boiler or storage tank 1 pump 1 3 way val 4 Boiler with storage tank 2 pumps PS 0 1 Heat pressure sensor 0 absent 1 present default 0 PA 15 60 Ignition air pressure default 30 oA 0 60 Offset Air default 2...

Page 38: ...conversion operation that is incor rect or not performed in compliance with the laws in force and or with the instructions given ATTENTION After performing the conversion for the operation of the boiler with a type of gas e g propane gas other than that specifically requested when or dering the appliance will only work with this new type of gas ATTENTION Indications for propane gas fired appliance...

Page 39: ...P1 absolute maximum power range 0 100 There are two calibration methods Manu allows an adjustment of the values around the calibrated value approximately 1 5 mbar It is activated with the procedure described in section 4 4 1 recommended procedure in most cases Auto allow reset of the previous values and the complete calibration of the gas valve typical use in case of valve replacement or gas trans...

Page 40: ...SSURE Chap 4 2 for example 14 1 Considering the example shown in the figure having to calibrate the valve to 14 1 mbar it can be concluded that it is a VALUE TOO LOW therefore Turn the C knob to the MAX and press the D button more time until it is close to the desired value eg 82 red on display which corresponds to 14 1 read on the pressure gauge NOTE do not exceed the target of max 0 2 mbar and c...

Page 41: ...rn the C knob to the INTERMEDIATE position and press the D button for about 2 seconds the new value will flash indicating new storage Turn knob B to MIN the display will show P0 and the modulation will drop to the minimum preset Wait few seconds for the pressure value to stabilize Read the pressure value MIN on the pressure gauge and compare it with the value in the table NOZZLES PRESSURE Chap 4 2...

Page 42: ...ice service service x 3 5 6 the writing Au to will appear the burner works at MAX and appears on the display P1 press the D key to display the value eg 31 Read the pressure value MAX on the pressure gauge and compare it with the value in the table NOZZLES PRESSURE Chap 4 2 ed 14 1 Considering the example shown in the figure having to calibrate the valve to 14 1 mbar it can be concluded that it is ...

Page 43: ...easing correction If the value read on the pressure gauge eg 14 1 is satisfactory SET Turn the C knob to the INTERMEDIATE position and press the D button for about 2 seconds the new value will flash indicating new storage Turn knob B to MIN the display will show P0 and the modulation will drop to the minimum preset Wait few seconds for the pressure value to stabilize Read the pressure value MIN on...

Page 44: ...tion of the maximum and completed with the minimum calibration Eventually at the end of the minimum calibration it will be possible to perform a check by moving back to the maximum level using knob B To exit disconnect the power supply Close any domestic hot water tap Disconnect the pressure gauge and close the pressure relief of the Gas Valve well SET Turn the C knob to the INTERMEDIATE position ...

Page 45: ...nal probe connection terminals TA1 OT Modulating TA connection terminals TA2 On off TA connection terminals GND OUT IN R SE BK TA 1 OT TA 2 WH WH Y Y BK BK GND WH SL BK CASING E ACC RIL T ACC A71 2 A5 2 1 4 3 6 5 A8 2 1 4 3 5 A9 4 3 2 1 A1 1 2 3 4 5 6 7 8 9 A2 1 2 3 4 5 6 7 4 3 2 1 A4 1 2 3 A3 2 3 1 5 6 4 MVD P N L1 BR YG BL 1 2 3 BL BR BK CH DHW M 230 V 50 Hz L1 N GND YG BL BR V N L1 BR YG BL A3 ...

Page 46: ...TER OVERPRESSURE detected if the H2 O pressure Transducer is present with pressure 2 5 bar it is reset automatically when H2 O pres sure 2 bar Wait for the values to return to default limits Replace the Transducer 30 3 SERVICE PARAMETERS Service parameters altered due to possible electromagnetic interferences Reset the altered parameters via the panel and or regola facile 21 4 POOR WATER CIRCULATI...

Page 47: ...freezing is detected If the heating sensor detects a temperature below 2 C burn er ignition is inhibited until the sensor detects a temperature above 5 C Disconnect the from the power supply close the gas valve defrost the exchanger carefully 13 14 DOMESTIC HOTWATER SENSOR Domestic hot water sensor fault 1 Check the efficiency of the sensor see table Res Temp Par 4 or its connections 12 15 HEATING...

Page 48: ...he status of the buttons Or repla ce the electronic board F 53 24 Clogged Outlets Check the Chimneys Check the trap BLOCK 28 Control circuit problems Gas Valve Check the Gas Valve connec tions Replace the Gas Valve 3 Replace the Modulation Board BLOCK 32 Gas Valve opening time beyond limit time Check the parts that generate the heat requests thermostats electrovalve limit switches flow switch etc ...

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Page 52: ...S p A www unical eu Unical declines every responsibility for the possible inaccuracies if owed to errors of transcript or press Also reserves the right to bring those changes that it will hold necessary to it own products or profits without jeopardizing its essential characteristics ORIGINAL INSTRUCTIONS 00337853EN 1 st ed 12 18 ...