Baxi 754 Service Manual

Baxi Bahama 100Gas Fired Wall Mounted Combination BoilerInstallation andServicing InstructionsBAXI

6.0 System Details – page 10Fig. 3Fig. 46.5 System Filling and Pressurising1. A filling point connection on the central heating returnpipework must be

6.0 System Details – page 11Key1 Expansion Vessel2 Primary Heat Exchanger3 Safety Thermostat4 CH Thermostat Sensor5 3 Way valve6 DHW Plate Heat Exchan

7.0 Site Requirements – page 12Fig. 5Fig. 67.1 Information1. The installation must be carried out by a CORGIRegistered Installer or other registered c

7.0 Site Requirements – page 13Fig. 87.5 Ventilation of Compartments1. Where the appliance is installed in a cupboard orcompartment, no air vents are

7.0 Site Requirements – page 14Fig. 97.8 Flue1. An internal fitting kit is available for installations wherethe flue terminal is inaccessible from the

7.0 Site Requirements – page 15Fig. 11Fig. 127.9 Flue DimensionsSee Section 1.2. The standard horizontal flue kit allowsfor flue lengths between 200mm

7.0 Site Requirements – page 167.12 Flue Options1. The Baxi Bahama 100 can be fitted with fluesystems as illustrated.2. The standard flue is suitable

8.0 Installation – page 17Fig. 13Fig. 148.1 Initial PreparationThe gas supply, gas type and pressure must bechecked for suitability before connection

8.0 Installation – page 18Fig. 15Fig. 168.3 Preparing The Boiler1. Remove the outer carton.2. Hinge down the lower door panel to thehorizontal and gen

8.0 Installation – page 198.4 Fitting The Boiler1. Fit the central heating return filter (Fig. 18) and flowregulator (Fig. 18a).2. Lift the boiler usi

Page 2Natural GasBaxi Bahama 100G.C.Nº 47 075 02Baxi Limited is one of the leading manufacturers of domesticheating products in the UK.Our first prior

8.0 Installation – page 20Fig. 23Fig. 248.6 Fitting The FlueHORIZONTAL FLUE1. The standard flue is suitable for lengths 200mmminimum to 965mm maximum

8.0 Installation – page 218.6 Fitting the Flue (Cont)10. Slide the rubber seal over the air duct with the thickersection outermost (Fig. 25). Align th

8.0 Installation – page 228.7 Making The Electrical Connections1. The electrical connections are on the left hand side ofthe unit.2. Undo the two scre

8.0 Installation – page 23Fig. 34Fig. 35Fig. 368.9 Fitting a Room Thermostat1. A 2-wire or 3-wire room thermostat can be fitted to theBaxi Bahama 100

9.0 Electrical – page 249.1 Schematic Wiring Diagram

9.0 Electrical – page 259.2 Illustrated Wiring Diagram

10.0 Commissioning the Boiler – page 2610.1 Commissioning the Boiler1. Reference should be made to BS 5449 Section 5when commissioning the boiler.2. O

10.0 Commissioning the Boiler – page 2710.3 Adjusting C.H. Setting PressureThe appliance is preset to supply an output of 80,000 Btu/h(23.45 kW) for c

11.0 Fitting the Outer Case – page 28Fig. 40Fig. 4111.1 Fitting The Outer Case1. Position the outercase on the chassis, ensuring that thefour slots in

12.0 Servicing the Boiler – page 2912.1 Annual ServicingHazardous materials are not used in the construction ofBaxi products, however reasonable care

Contents – page 3Section1.02.03.04.05.06.07.08.09.010.011.012.013.014.015.016.017.018.0IntroductionGeneral LayoutAppliance OperationTechnical DataDime

13.0 Changing Components – page 3013.1 Changing ComponentsIMPORTANT: When changing components ensure thatboth the gas and electrical supplies to the b

13.0 Changing Components – page 31To change the heat exchanger - fan - burner and injectormanifold - flame sensing probe -spark electrode andreturn el

13.0 Changing Components – page 32Fig. 52Fig. 5313.6 Burner and Injector Manifold1. Disconnect the spark, return and flame sensingelectrode leads from

13.0 Changing Components – page 33To change the gas valve - spark generator -pump (headonly) - pump - thermistor & safety thermostat -expansion ve

13.0 Changing Components – page 3413.11 Pump1. If only the head needs replacing. A standard GrundfosUPS 15-60 pump head is interchangeable (see sectio

13.0 Changing Components – page 3513.14 Thermistor1. Remove the thermistor from the flow pipe.2. Remove the electrical connections from the sensor.3.

13.0 Changing Components – page 3613.18 Pressure Relief Valve (Fig. 62)1. The pressure relief valve is positioned on the centralheating bypass pipe at

13.0 Changing Components – page 3713.21 Diverter ValveTo change the diverter valve actuator:1. Remove electrical plug (Fig. 65).2. Depress the locking

13.0 Changing Components – page 3813.22 Domestic Hot Water Filter and Flow RegulatorCartridge (Fig. 69)1. Isolate the cold water inlet tap.2. Undo the

13.0 Changing Components – page 3913.24 Domestic Hot Water Heat Exchanger1. Remove the gas valve (see 13.9 Gas Valve section 1-6incI.).2. Remove the c

1.0 Introduction – page 4Fig. 1Fig. 2“Benchmark” Log BookAs part of the industry-wide “Benchmark” initiativeall Baxi boilers now include an Installati

13.0 Changing Components – page 40Fig. 7513.25 Hydraulic Control Board1. Remove the facia cover by removing the securingscrews and pulling it forwards

14.0 Short Parts List – page 41Short Parts ListKey G.C. Description ManufacturersNo. No. Part No.7 E02 745 Burner 2411408 E02 746 Electrode - Burner 2

15.0 Fault Finding – page 42

15.0 Fault Finding – page 43

15.0 Fault Finding – page 44

15.0 Fault Finding – page 45

16.0 Operational Flow Chart – page 4616.1 Central Heating Mode16.2 Domestic Hot Water

16.0 Operational Flow Chart – page 47

17.0 Ignition Flow Chart – page 4817.1 Ignition PhaseIGNITION PHASE(From Section 16.0Operation Flow Chart)17.2 Overheat Lockout ProcedureNon volatile

18.0 Notes – page 49

2.0 General Layout – page 52.1 Layout1. Backplate2. Airbox3. Fan Assembly4. Primary Heat Exchanger5. Combustion Chamber6. Burner Assembly & Electr

18.0 Notes – page 50

Page 51Baxi Limited manufacture a comprehensive range ofproducts for the domestic heating market.Gas Central Heating Boilers(Wall, Floor and Fireside

The Baxi Helplines - Page 52Comp Nº 245528 – Iss 3 – 4/00For General Enquiries+44 (0)1772 695 555For After Sales Service+44 (0)1772 695 505For Technic

3.0 Appliance Operation – page 6NOTE: All delay timers mentioned in 3.1 and 3.2 areoverridden by domestic hot water demand.3.1 Central Heating Mode1.

4.0 Technical Data – page 7

5.0 Dimensions and Fixings – page 8

6.0 System Details – page 96.1 Information1. The Baxi Bahama 100 Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the