Worcester 26CDi Xtra Manual de Serviço Página 1

26CDi XTRAWALL MOUNTED CONDENSING COMBINATION BOILER FORCENTRAL HEATING AND MAINS FED DOMESTIC HOT WATERINSTALLATION ANDSERVICING INSTRUCTIONSGC NUMBE

8.1 The following are general requirements and, if necessary,reference should be made to the local Water Company beforefitting the appliance.8.2 MAINS

11Fig. 9. Mains electricity connections.Strain relief clampGreen/yellowBrownBlueL230VST12NNsLRLSFig. 10. Wiring diagram.FanOverheatcut-offdeviceFlame

12Fig. 11. Functional flow diagram. MainsindicatorOn/OffswitchST8(LS)ST8(LR)ST8(NS)ST1CentrePinST15Pin LST1Pin LREL 1 REL 3HighLowREL4PumpFan(2 speed)

13Fig. 12. 230 V room thermostat connections.Fig. 14. 230 V room thermostat andprogrammer connections.Fig.13. 230 V programmer connections.NS LSST8ST8

The appliance is supplied suitable for fitting to a sealedprimary system only. Refer to fig. 15.IMPORTANTTwo flue options are available:i) Standard Fl

Rear and Side InstallationDrill or cut the flue duct hole horizontally through the wall. Referto fig.17 for the minimum core drill size for various wa

Slide the appliance onto the pre-plumbing manifold ensure thethree pegs are located correctly. Secure with the two M6 nutsand washers at the top and s

Check the contents of the Standard Flue or the Extended Flueagainst their respective packing list.Remove all the packing from the ducts and terminal a

flue terminal.f) Drill through the holes in the flue terminal into the air ductwith the drill provided. Fix the flue terminal temporary with thescrews

Check that all the water and gas connections have beentightened.If a facia mounted programmer is to be fitted follow theprogrammer instructions. Hinge

1.1 Gas Safety (Installation and Use) Regulations 1998, as amended, all gas appliances must be installed by acompetent person in accordance with the

Remove the cabinet front panel.Check that the electrical supply and the gas service to theappliance are off. See fig 3.Check that all the water connec

Any programmer fitted on the appliance should be set up at thisstage following the instructions sent with the programmer.The programmer will retain th

Domestic Hot WaterCommence by opening a hot tap near to the appliance.Gradually close the hot tap and check that the burner pressuredrops. Fully open

12.6 If an external programmer has been fitted which has aprogrammable domestic hot water facility then it is suggestedthat this be set to Continuous

Unhook the securing rods out of the locating holes in thecombustion chamber sides.Ease the combustion chamber front and side assembly clear ofthe appl

When reassembling ensure the sealing washer located in theunion nut is replaced. If the washer is damaged it must bereplaced.Ensure the sealing gromme

2. Air Flow Pressure Switch. See fig.34.Check that the electricity supply to the appliance is turned off.Remove the cabinet front panel and hinge the

8. Burner Injector. See fig. 36.Remove the burner as described in Section 13.3 (h).Unscrew the brass injector from the burner and discard.Fit the repl

12. Central Heating Sensor. See figs. 32 and 33.Check that the electricity supply to the appliance is turned off.Remove the inner casing cover as desc

15. Pressure Relief Valve. See fig. 37 and 39.Check that the electricity supply to the appliance is turned off.Drain the central heating circuit as de

2.6 GAS SUPPLYCheck the data plate (located on the inner cover of the appliance)to ensure the appliance has been set up for the correct gassupply. The

18. Water Diverting Valve Micro Switch Assembly.See figs. 37 and 40.Check that the electricity supply to the appliance is turned off.Hinge down the fa

Feed the pipe and sealing grommet clear of the inner casing.Retain all components and securing clips removed.Cut the plastic strap securing the expans

25. Secondary Heat Exchanger. See figs. 32, 33, 34, 35, 36, 37,39, and 43.Check that the electricity supply to the appliance is turned off.Drain the c

Reassemble the appliance in the reverse order. Ensure all gasketseals and ‘O’ connections are made correctly. Open the valves filland re-pressurise th

26 E80 450 Gas Valve – Natural Gas Dungs BM771 SL040 1 8 716 102 673 026 E80 451 Gas Valve – Propane Dungs BM771 SL040 1 8 716 102 868 078 375 695 Bur

35(NG OR LPG)(NG OR LPG)20196109

MAIN SWITCHONGreen LightOnRoomthermostatand/or mainsprogrammer(or link) OnANDElectronicfaciaprogrammer(if fitted) OnANDST13 link inANDCH controlknob O

37MAIN SWITCHONGreen LightOnFlow switchOn(Top open)DOMESTICHOT WATERDEMAND(Priority overCH demand)HW light On.Pump On.Fan On high/ignitionsequence.Bur

38Within fourminutes oflast hot waterdemandANDprimarytemperatureabove 80°CIf heatdemand hasoccurred inlast 30minutesIf heatdemand hasNOToccurred inlas

3917. Fault Finding

508050508050CondenseNon-cond.Condense.CondenseNon-condCondense7.624.2526.07.624.2526.0(25,930)(82,750)(88,710)(25,930)(82,750)(88,712)7.525.2525.257.5

40Is 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

41Red diode isdamaged. Replacecontrol board.(Section 14.3.23)Is there a link atterminal ST13 pins 1and 2?Is there an electronicprogrammer atposition S

42Boiler is running in“Autofrost stat” mode.See Section 17.Is the boiler in a verycold environment (lessthan 5°C)?Drop down the facia.Is the gas valve

43Remove front panel.Reset and restart theboiler. Can a flame beseen through the spyglass?Turn off boiler. Removeinner cover andcombustion chambercove

44Remove multiwayconnector from boardposition ST16. Testresistance acrosscontacts 17 and 18(yellow wires). Is itbetween 1 kohm and30 kohm?Test resista

45Does the fan runbefore the faultoccurs?Turn off boiler. Is therecontinuity across theC and NO terminals ofthe air pressure switch(where green wires

Yes Yes46Light indicationduring fault notcovered by abovedetails.Control board is likelyto be wet or damagedor malfunctioning.Check for wet board orco

47ONLY COMPONENTS SUPPLIED BY WORCESTERSHOULD BE USED.ONLY COMPETENT PERSONNEL SHOULD ATTEMPTTHE CONVERSION.CONVERSION FROM NATURAL GAS TO LPG SHOULDN

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

5Available pump head.Boiler output. Head Min, flow rateTemperature riseacross heating flowkW Btu/h Metres Feet L/min. Gal/Min. and return6.7 (22,860)

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

See figs. 2 and 3.4.1 The appliance may be installed in any room althoughparticular attention is drawn to the requirements of the currentl.E.E. Wiring

7Fig. 3. Appliance pipework connectionsScrew driver required to operate Valves.Valves shown closed.ABCDEFG91(A, B, C, D, and E)61110(G)(F)(G)85A B C D

See fig. 4 and 15.5.1 The flue must be installed as specified in BS 5440:Part 1.Important. The flue must be installed with an incline of 2l/2°(44mm pe

See figs. 5, 6, and 7.7.1 The system must comply with the requirements of BS 6798and BS 5449.7.2 The appliance must not be operated without the system