Worcester 28CDI Manuel de service

24CDi/28CDi/35CDi IIRSFWALL MOUNTED COMBINATION BOILER FOR CENTRAL HEATINGAND MAINS FED DOMESTIC HOT WATERINSTALLATION ANDSERVICING INSTRUCTIONS24CDi

11.1. Mains supply : 230V ~ 50Hz, 180watts. External fuse 3A,Internal fuses F1 - 2A, F2 - 1.25A (20mm). Spare internal fusesare supplied with the appl

11Fig. 10. Functional flow diagram. MainsindicatorOn/OffswitchST8(LS)ST8(LR)ST8(NS)ST1CentrePinST15Pin LREL 1 REL 3PumpFanST1CentrePinST15Pin LST1Pin

12Fig 11 - Electrical Connections131234567891011121. ST12-Mains 9. Fuse-F22. Fuse-F1 10

Read this section fully before starting the Installation.12.1 General.The appliance is supplied suitable for fitting to a sealed system. Ifit is to be

Remove the inner casing cover. Refer to Section 15.3.(b).If the air/flue duct assembly is to be fitted from inside the building thenthe ducts must be

extends the flue by 750mm up to a maximum of 4m. See table below.EXTENSION MAXIMUM FLUE LENGTH mm24CDi 28CDi35CDi II1 1475 1475 14752

12.12. Flue Bends.90° and 45° bends are available. A maximum of two bends may beused in addition to the first bend on the flue turret.A 90° bend is e

The first, vertical, section (equivalent to dimension X) is measured fromthe top of the boiler casing. Cut the vertical section of the extensionduct t

should be fitted as shown in Fig. 6,6a.Insert the bayonet end of the filling key into the corresponding cutoutsin the filling loop housing and twist t

19sensed by the control circuit. The burner pressure should be 14.8mbar(24CDi) or 15.5mbar (28CDi) or 13.5mbar (35CDi II) for natural gas and35.5mbar

1.1 Gas Safety (Installation & Use) Regulations 1998: It is the lawthat all gas appliances are installed by a competent person inaccordance with t

15.1 SERVICINGTo ensure continued efficient operation of the appliance itmust be checked and serviced as necessary at regularintervals. The frequency

21Clean the Gas to Water Heat Exchanger. Cover the burnermanifold hole in the combustion chamber bottom panel with acloth. Clean the heat exchanger us

224. Overheat Thermostat. See Fig. 34.Check that the electricity supply to the appliance is turned off.Remove the inner casing cover as described in S

10. Flame Sensor. Refer to Fig. 32.Remove the burner as described in Sections 15.3, h and 16.4.7.Undo the M3 screw and remove the sense electrode from

2412. Central Heating Sensor. Refer to Fig. 34.Remove the inner casing cover as described in Section 15.3, b.Check that the electricity supply to the

18. Water Diverting Valve. See Fig. 36, 40.Check that the electricity supply to the appliance is turned off.Drain the central heating and domestic hot

22. Filling Loop. Refer to Fig. 40.Check that the electricity supply to the appliance is turned off.Drain the central heating circuit as described in

2717. Short Parts ListPart WHS Part No.Horizontal Telescopic Flue Kit 7 716 191 068Flue Duct Extension Kit 7 716 191 006Vertical Balanced Flue Kit &a

28109

2918. Operational Flow DiagramsMAIN SWITCHONGreen LightOnRoomthermostatand/or mainsprogrammer(or link) OnANDElectronicfaciaprogrammer(if fitted) OnAND

Any specified ventilation openings made into a wall orcompartment door must not be obstructed.If the appliance is to be fitted into a compartment then

30Within fourminutes oflast hot waterdemandANDprimarytemperatureabove 80°CIf heatdemand hasoccurred inlast 30minutesIf heatdemand hasNOToccurred inlas

31No lights at allOther faults not covered by aboveFAIL POINT C FAIL POINT BFAIL POINT EFAIL POINT JFAIL POINT KFAIL POINT AFAIL POINT DFAIL POINT FFA

32Is the facia on/offswitch turned on?`(Clockwise)Is there a 230V AC livesupply acrossTerminal ST12 pins Land NHas fuse F1 blown?Replace fuse and inve

33Red diode isdamaged. Replacecontrol board.(Section 16.4.23)Is there a link atterminal ST13 pins 1and 2?Is there an electronicprogrammer atposition S

34Boiler is running in“Autofrost stat” mode.See Section 18.Replace control board.(Section 16.4.23).Note: A wet boardcould cause this fault.Is the boil

35Remove front panel.Reset and restart theboiler. Can a flame beseen through the spyglass?Turn off boiler. Removeinner cover andcombustion chambercove

36Remove multiwayconnector from boardposition ST16. Testresistance acrosscontacts 17 and 18(yellow wires). Is itbetween 1 kohm and30 kohm?Test resista

37Does this fault occur inonly one of the operatingmodes? CH or DHWReplace control board(Section 16.4.23).Replace control board(Section 16.4.23).Repla

38Light indicationduring fault notcovered by abovedetails.Control board is likelyto be wet or damagedor malfunctioning.Check for wet board orconnectio

ONLY COMPONENTS SUPPLIED BY WORCESTERSHOULD BE USED.ONLY COMPETENT PERSONNEL SHOULD ATTEMPT THECONVERSION.CONVERSION FROM NATURAL GAS TO LPG SHOULDNOT

4PUMP HEADBOILER OUTPUT HEAD MIN. FLOW RATEFLOW/ RETURNDIFFERENTIALkW Metres L/min. °C 9.0 4.2 11.7 11°C 24.0 2.020.5

CONTROLS To comply with the Building Regulations, each section must have a tick in one or other of the boxesTIME & TEMPERATURE CONTROL TO HEATING

SERVICE INTERVAL RECORDIt is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record

This booklet is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in

5PERFORMANCE SPECIFICATIONSPRIMARY WATER CAPACITY 2.0 litres MAXIMUM MAINS INLET PRESSURE 10 bar MINIMUM MAINS INLET PRESSURE (working) for max. hot w

4.1 The appliance may be installed in any room althoughparticular attention is drawn to the requirements of the currentI.E.E. Wiring Regulations BS 76

The flue system must be installed following the requirements ofBS5440:1.The standard uncut flue kit length is 425 - 725mm. Extensionkits for flues up

See Figs. 5, 6 and 6a7.1 The system must comply with the requirements of BS 6798and BS 5449.7.2 The appliance must not be operated without the systemb

9.1 The size of the flow and return pipework is given in Section 3– Table 4. The components required to connect the appliance toan open vent system ar