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British Gas 100 & 125 RD2 -

Installation & Servicing

GENERAL

65 THERMOSTAT REPLACEMENT

1.

Remove the lower front panel and grille assembly. Refer
to Frame47

2.

Undo the overheat thermostat sensor retaining screw and
withdraw the sensor from the pocket.

3.

Remove the control box cover.

4.

Unfasten the overheat thermostat retaining nut ,
disconnect the electrical leads and withdraw the
thermostat from the control box.

5.

Fit the new thermostat and reassemble in reverse order.

6.

Check that the reset button on the new thermostat is
pressed in.

7.

Check the operation of boiler.

Thermostat

pocket

Hook plate

Sensor end

2

Mex 1861

Mex 1862

3

Alignment peg

6

4

SER

VICING

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Summary of Contents for British Gas 100 RD2

Page 1: ......

Page 2: ...e system demands Complete range There are 7 models in the range All models include an overheat thermostat and a Flue Directional kit for side and top outlet installations Full system suitability All models are suitable for connection to pumped open vent central heating systems pumped central heating combined with pumped or gravity indirect domestic hot water supply systems They can also be used on...

Page 3: ...r Output to Water kW Btu h 29 3 100 000 36 6 125 000 Burner Setting Pressure hot mbar in w g 11 5 4 6 13 2 5 3 Seasonal Effiiciency SEDBUK Band D 77 6 D 77 9 Table 2 Performance Data Note Gas consumption is calculated using a calorific value of 38 7 MJ m3 1038 Btu ft3 gross or 34 9 MJ m3 935 Btu ft3 nett To obtain the gas consumption at a different calorific value a For l s divide the gross heat i...

Page 4: ... is required to receive and transmit data from the boiler Without this facility the boiler operates as standard fanned flued boiler OPTIONAL EXTRA KITS Extension Duct kit To extend standard flue 90 o Flue Elbow Kit CONTENTS Air Supply 7 Boiler Assembly Exploded view 12 Boiler Clearances 6 Electrical Connections 23 Electrical Diagrams 23 26 Electrical Supply 8 Extension Ducts Fitting 21 Fault Findi...

Page 5: ... any way as overriding statutory obligations IMPORTANT These appliances are certificated by the BG Technology Certification Services for safety and performance It is important therefore that no external control devices e g flue dampers economisers etc are directly connected to these appliances unless covered by these Installation and Servicing Instructions or otherwise recommended by British Gas i...

Page 6: ...or servicing An existing cupboard or compartment may be used providing it is modified for the purpose In both cases details of essential features of cupboards compartment design including airing cupboard installation are to conform to the following z z z z z BS 6798 z z z z z The position selected for installation MUST allow adequate space for servicing in front of the boiler and for air circulati...

Page 7: ...e 3 4 Where the lowest part of the terminal is fitted less than 2m 6 6 above a balcony above ground or above a flat roof to which people have access then the terminal MUST be protected by a purpose designed guard Terminals guards are available from boiler suppliers ask for Tower Flue Guard Model K1 In case of difficulty seek advice from Tower Flue Components Ltd Vale Rise Tonbridge Kent TN9 1TB Te...

Page 8: ...ing system should be thoroughly flushed with appropriate water treatment in order to comply with BS7593 1992 British Gas recommend the use of Fernox or Betz Dearborn water treatment products which must be used in accordance with the manufacturers instructions For further information contact Fernox Manufacturing Co Ltd Tandem House Marlowe Way Croydon Surrey CRO 4XS tel 0870 5601 5000 or Betz Dearb...

Page 9: ... between the top of the boiler and the base of the cylinder 3 MINIMUM REQUIREMENTS Fully pumped systems 1 Open vent and cold feed connections must be made to the boiler flow and return tappings according to the options shown in Frame 12 2 The boiler is assumed to be the highest point of the circulating system 3 The circulating pump is positioned on the FLOW and the vertical distance between the pu...

Page 10: ...sure gauge covering at least the range 0 4 bar 0 60 lb in2 must be fitted to the system The gauge should be easily seen from the filling point and should preferably be connected at the same point as the expansion vessel 4 Expansion Vessel a A diaphragm type expansion vessel must be connected at a point close to the inlet side of the pump the connecting pipe being not less than 15mm 1 2 nominal siz...

Page 11: ...nitial system design pressure The cold feed pipe from the cistern should include a non return valve and a stop valve with an automatic air vent connected between them the stop valve being located between the system and the automatic air vent The stop valve may remain open during normal operation of the system if automatic water make up is required b Through a self contained unit comprising a ciste...

Page 12: ...rner manifold 28 Gas cock 38 Pressure switch 41 Air inlet duct 42 Turret access cover assy 46 Boiler base plate 47 Baseplate heat shield 49 Flue baffle 65 Control box 92 Thermostat bush LEGEND 1 Heat exchanger assembly 2 Front section 3 Centre section 4 Section alignment rings and O rings 5 Back section 6 Flow thermistor sensor pocket 6A Return thermistor sensor pocket 6B O heat thermostat sensor ...

Page 13: ...bs from under the top panel BOILER HARDWARE PACK z 1 BSP plugs 3 off z Distributor tube 1 off z 28mm x 1 BSP male straight adapter compression fitting 3 off For connection to the boiler PUMPED GRAVITY flow return tappings z Flow sensor pocket 1 off z Return sensor pocket kit comprising Hexagon bush 1 off Sensor pocket 1 off O ring 1 off Heyco bush 1 off M5 x 10mm Pozi screw 3 off Washers 3 off z O...

Page 14: ...top panel forward and lift it off the boiler 9 Remove the 2 screws securing the LH side panel to the turret front panel and baseplate 10 Pull the panel forward disengaging from the collector hood tab lift it clear of the locating peg and remove 11 Repeat steps 9 and 10 to remove the RH panel 12 The boiler is held to the packaging base by 4 M6 hex head screws Remove the front screws slacken the rea...

Page 15: ... Bottom Bottom LH LH LH LH RH LH RH LH RH LH RH RH RH RH LH RH LH RH LH RH 1 Screw the distributor tube supplied with a 1 BSP x 28mm copper adaptor into the selected heating return tapping using an appropriate jointing material IMPORTANT It is IMPERATIVE that the index mark on the distributor tube bush is in alignment with the mark on the section boss as shown in Frame 3 DO NOT disturb it when con...

Page 16: ... cardboard support provided 4 5 3 2 1 Mex 1843 6 10 9 8 7 15 TOP FLUE OUTLET ASSEMBLY 100 ONLY Exploded view IMPORTANT The maximum total equivalent horizontal flue length is 2m for 100 model 5 Mex 1844 1 6 3 2 4 7 LEGEND 1 Terminal 2 Weather seal 3 Flue assembly 4 Boiler sealing ring 5 Flue extension tube 6 Elbow 7 Flue connector 8 Turret access cover Notes For lengths greater than 600mm see Frame...

Page 17: ...es immediately around the cut hole should be flat make good if necessary For less accurate holes make good to approximately 125mm 5 diameter at the 2 wall faces 4 Remove the template from the wall Note If the terminal is to be sited within 25 40mm of a corner or vertical pipe refer to Table 3 then the hole MUST be accurately cut and the rubber weather seal trimmed around the groove provided The te...

Page 18: ... the position for the foam seal measure the wall thickness and mark it onto the flue measuring from the groove near the terminal 2 Wrap the self adhesive foam strip round the flue ensuring that the foam is on the terminal side of the line This seals the gap between the flue and the wall 20 FITTING THE FOAM SEAL 21 FITTING THE FLUE ASSEMBLY A Inside fitting If the flue assembly cannot be fitted fro...

Page 19: ...M4 screw Note The sealing ring studs will locate in the back panel one way only This will ensure that the terminal is correctly aligned 24 CONNECTING THE FLUE TO THE BOILER Side 22 LOCATING THE BOILER Rear and Side flue A If the flue assembly can be fitted from the outside proceed as follows 1 Move the boiler into position ensuring that the flue outlet is in line with the wall opening 2 Insert the...

Page 20: ...the split line 2 Fit the 2 halves of the side outlet plate to the wall ensuring they are behind the boiler sealing ring 1 Connect the flue terminal to the boiler using the length A of flue duct previously cut and ensuring that the inner flue locates into the kit extension tube without ring 2 Secure the flue to the boiler using the 2 M4 x 16mm screws previously removed 25 CONNECTING THE FLUE TO THE...

Page 21: ...08 600 to 1000 B 1 off D 1 off B 1 off D 1 off 150 308 152132 600 to 1550 B 1 off D 1 off N A 150 308 152132 1 off 1550 to 2000 B 1 off D 2 off N A 150 308 152132 2 off Top outlet flue length A B Elbow allowance 90 o Elbow 1m 45 o Elbow 0 7m 29 FITTING THE KIT 1 Remove the cardboard support aid from the flue and place safely to one side 2 Fit the inner flue extension duct onto the inner flue duct ...

Page 22: ... a gas supply pipe NOT LESS THAN 15mm 1 2 OD to the boiler and connect to the gas cock situated at the front LH side of the boiler 3 Test the gas installation for soundness and purge in accordance with BS 6891 1988 Refer to Servicing instructions Boiler Dimension A 100 473 18 5 8 125 546 21 1 2 30 TERMINAL WALL PLATE This plate allows neat concealment and full compression of the rubber seal Its us...

Page 23: ...ity DHW applications the pump MUST be wired through the programmer 1 Remove the securing screw and lift off the mains terminal box cover 2 Route the mains cable from the LH rear of the boiler along the front of the baseplate to the terminal box Note Leave sufficient length of cable to enable it to be routed as shown once the casing has been refitted and secure to the casing with the ties provided ...

Page 24: ...ave sufficient length of cable to enable it to be routed as shown once the casing has been fitted and secure to the casing with the ties provided 4 Controls that override an on off control e g frost thermostat must be wired in parallel with the control s to be overridden Refer to Frame 38 5 If a proprietary system is used follow the instructions supplied by the manufacturer Advice on required modi...

Page 25: ...bering of terminals on thermostats see the manufacturer s literature 3 This is a fully controlled system set the boiler thermostat to maximum 4 Switchmaster Smiths valves are similar but note that the GREY NOT the orange wire MUST be the one connected to permanent L 39 HONEYWELL C PLAN Gravity HW Pumped CH IMPORTANT The pump must not be wired directly to the boiler Notes 1 Some earth wires are omi...

Page 26: ...using the screws previously removed 12 Relocate the Burner on neon in the lens holder at the back of the control panel 13 Fit the control thermostat to the rear of the control panel using the 2 screws provided Fit the correct way up as shown T 14 Fit the control thermostat knob 15 Secure the wiring harnesses in the edge clips on the RH side panel 16 Secure all other internal wiring IMPORTANT Wirin...

Page 27: ...mostat F is OFF 3 Slacken the screw in the burner pressure test point B and connect a gas pressure gauge via a flexible tube 4 Switch the electricity supply ON and check that all external controls are calling for heat 5 Press the reset button J and the overheat thermostat reset button H 6 Set the boiler thermostat knob F to position 6 The fan will start After the fan has run for a few seconds the ...

Page 28: ...e User s Instructions to the householder and explain his or her responsibilities under the current Gas Safety Installation and Use Regulations or the rules in force 2 Draw attention to the lighting instruction label affixed to the inside of the controls door 3 Explain and demonstrate the lighting and shutting down procedures 4 The operation of the boiler and the use and adjustment of ALL system co...

Page 29: ...k that the flue terminal is unobstructed and that the flue system is sealed correctly h If the appliance has been installed in a compartment check that the ventilation areas are clear The servicing procedures are covered more fully in Frames 47 to 52 and MUST be carried out in sequence Note In order to carry out either servicing or replacement of some components the boiler casing must removed Refe...

Page 30: ... 1 Brush off any deposits that may have fallen onto the burner heads ensuring that the flame ports are unobstructed and remove any debris that may have collected 2 Remove the main burner injectors Check clean or replace as required 3 Refit the injectors using an approved jointing compound 4 Inspect the ignition detection electrodes ensure they are clear and in good condition Check that a The HSI a...

Page 31: ...Any Re assemble the boiler in the following order 1 Refit the flue baffles 2 Inspect the collector hood rope gasket and replace if necessary ensuring that the self adhesive rope is fitted centrally on to the lip of the collector hood fan assembly The boiler efficiency will be adversely affected if incorrectly fitted Refit the collector hood cover with the 4 screws Tighten the screws Ensure that th...

Page 32: ...at the position of the HSI relative to the burner is correct 7 Check the operation of the boiler 1 Remove the lower front panel and grille assembly Refer to Frame 47 2 Remove the control box cover 3 Unplug the potentiometer lead from the PCB and withdraw it from the control box 4 Disengage the lead from the retaining clips 5 Pull off the thermostat knob 6 Remove the 2 screws securing the potentiom...

Page 33: ...rols assembly a Remove the control box cover b Unplug the HSI lead from the PCB and withdraw it from the box c Disconnect the detection lead from the electrode d Remove the screw securing the control box to the baseplate slide to the left to release and place to one side e Disconnect the electrical leads from the gas valve f Undo the gas service cock union g Remove the 4 wing nuts and withdraw the...

Page 34: ...ompound and re assemble in reverse order 6 Check the operation of the boiler 59 MAIN BURNER INJECTOR REPLACEMENT 1 Remove the lower front panel grille assembly Refer to Frame 47 2 Remove the burner and controls assembly Refer to Frame 57 3 Remove the 2 nuts and washers securing the burner to the front plate and manifold Withdraw the burner 4 Fit the new burner and re assemble in reverse order taki...

Page 35: ...sealing O ring supplied with the valve is correctly fitted at the outlet flange c An approved jointing compound is used when reconnecting the gas inlet pipe 6 Reassemble in reverse order 7 Check the operation of the boiler 60 GAS VALVE REPLACEMENT 1 Remove the lower front panel control panel and top panel Refer to Frame 47 2 Remove the silicon rubber tube from the fan pressure sensing point 3 Disc...

Page 36: ... top off the holder and disengage the fuse Refer to Frame 34 for location Mex 1860 Overheat thermostat reset button Control box cover PCB Reset button 64 THERMISTOR SENSOR LEAD HARNESS REPLACEMENT 1 Remove the lower front panel and grille assembly Refer to Frame 47 2 Remove the control box cover Refer to Frame 63 3 Unplug the 7 way Molex connector carrying 6 wires from the top of the PCB 4 Withdra...

Page 37: ...nsor from the pocket 3 Remove the control box cover 4 Unfasten the overheat thermostat retaining nut disconnect the electrical leads and withdraw the thermostat from the control box 5 Fit the new thermostat and reassemble in reverse order 6 Check that the reset button on the new thermostat is pressed in 7 Check the operation of boiler Thermostat pocket Hook plate Sensor end 2 Mex 1861 Mex 1862 3 A...

Page 38: ...ure If no fault found change PCB Check pressure switch sensing pipes for blockages bad connections and reversed connection Is pressure difference at switch greater than 0 9 mbar Change fan Is fault corrected YES NO Change pressure switch Is fault corrected Does the main burner light NO YES YES Does the hot surface igniter turn off NO Is there a gas supply to the boiler Is the pilot injector blocke...

Page 39: ...etection electrode lead 460mm 1 052 888 30 386 149 Automatic ignition PCB PACTROL PCB No42 with modem board PCB No 43 1 152 800 38 Pressure switch HONEYWELL C6065F1373 1 155 412 49 E26 419 Flue baffle kit 100 6 079 890 E26 420 125 4 079 891 67 308 557 Thermostat knob 1 139 296 83 E26 452 Overheat thermostat 1 153 727 89 Potentiometer with harness 1 154 443 90 Thermistor sensor harness CROSSLANDS 1...

Page 40: ...40 British Gas 100 125 RD2 Installation Servicing SHORT LIST OF PARTS 66 SHORT PARTS ...

Page 41: ...ation Servicing LIST OF PARTS Legend 63 Control panel complete assembly 67 Control potentiometer knob 71 Control front panel door 72 Magnetic strip 89 Control potentiometer 67 BOILER CONTROL PANEL Exploded View 68 BOILER CASING ASSEMBLY ...

Page 42: ...w Mex 1851 29 37 30 34 Legend 16 Burner assembly complete 18 Burner manifold 20 Main burner 21 Main burner injector 24 Gas valve 25 Gas valve O ring 26 Detection electrode 26A Hot surface igniter 28 Gas cock 70 BURNER ASSEMBLY Legend 29 Control box 30 PCB 34 PCB standoff 37 Control box cover ...

Page 43: ...43 British Gas 100 125 RD2 Installation Servicing NOTES ...

Page 44: ...pted by BSI British Gas Services Limited Registered in England No 3141243 Registered Office Charter Court 50 Windsor Road Slough Berkshire SL1 2HA British Gas Services Ltd has made every effort to ensure that the information contained in this leaflet is accurate However not all the information is within the control of British Gas Services Ltd and it may have changed since publication British Gas S...

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