Baxi Potterton G.C.No 47 393 21, G.C.No 47 393 23 Introduction, Description, Contents of Pack

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Case Front Panel

Control Box

Facia Door

Fig. 1	Data Badge

Information Label

1.0Introduction

1.1Description

1.The Potterton Promax Combi HE Plus A is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and mains fed domestic hot water.

2.The boiler is set to give a maximum output of :-

24 models -	24 kW DHW
	21 kW CH (Condensing)
28 models -	28 kW DHW
	25.9 kW CH (Condensing)
33 models -	33 kW DHW

30.3kW CH (Condensing)

3.It is designed for use on Natural Gas (G20).

4.The boiler is suitable for use only on fully pumped sealed heating systems. Priority is given to domestic hot water.

5.The boiler data badge gives details of the model, serial number and Gas Council number and is situated on the inner door panel or the control box. It is visible when the case front panel is removed (Fig. 1).

6.The boiler model name and serial number are also shown on the information label on the back of the facia door. This is for user reference.

7.The boiler is intended to be installed in residential / commercial / light industrial E.M.C. environments on a governed meter supply only.

8.The boiler must be installed with one of the purpose designed flues such as the standard horizontal flue kit, part no. 5118489.

9.All systems must be thoroughly flushed and treated with inhibitor (see section 6.2).

Important: If the boiler is installed at a high point in the system it is strongly recommended that Automatic Air Vent Kit 720004701 is fitted.

1.2Contents of Pack

1.Boiler Unit

2.Wall Plate (inc. taps)

3.Set of Pipes (inc. nuts)

4.Template & Quick Fit Guide

5.Literature Pack

© Baxi Heating UK Ltd 2011

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Contents Installation & Service Instructions 0086 Scheme Members only Installer Notification Guidelines Legislation Important Installation, Commissioning, Service & Repair Codes of Practice refer to the most recent version Technique Safe Manual HandlingGeneral PreparationContents Introduction Contents of PackDescription Layout General LayoutAppliance Operation Frost Protection ModePump Protection Promax Combi 24, 28 Technical Data32.5 mm Condensate Drain 65 mm Dimensions and FixingsOrientation Tap RailBypass System DetailsInformation Central Heating CircuitExpansion Vessel Central Heating only System Filling and Pressurising FigPressure Relief Valve Fig Showers Domestic Hot Water Circuit FigHard Water Areas Location Site RequirementsAt Least 1.5 7.2 Clearances Figs Electrical Supply Site RequirementVentilation of Compartments Gas SupplyCondensate Drain Flue terminal guard FlueHorizontal Flues Each fitting to aid assemblyFlue Options Horizontal Flue SystemsApart Vertical FluesTwin & Vertical Flue Systems 120mm MinKey Accessory Size Code No Flue AccessoriesTelescopic Internal Flue Kit Twin Flue Connection Twin Flue Duct AdaptorAir Duct Connection Flue Duct Connection Boiler Adaptor Terminal Guard Fig Flue DimensionsFor Roof Terminals Flue TrimPlume Displacement Kit Fig Plume DisplacementMetres Ring Adaptor 5121368 28/33Determining Permissible Lengths Example30mm General Fitting NotesExtension and outlet. Secure using two of the screws Elbow to allow the flue to be installed as shown60Ø extension piece. It must be secured using two Using a suitable bit e.g mm, drill throughAfter considering the site requirements InstallationUnpacking & Initial Preparation FlushingTighten all the connections Fitting The BoilerFitting the Pressure Relief Discharge Pipe Fig Condensate Drain see sectionEnsure Elbow is fully Engaged into Boiler Fitting The FlueWall Thickness Waste Flue Elbow25mm Extension Cut End Inner Flue Support BracketEnsure Extension is fully engaged into Boiler Adaptor Preliminary Electrical Checks Making The Electrical ConnectionsTerminal Block Cover Cable Clamp Commissioning the Boiler CommissioningPressure Completion CompletionCase Front Panel Facia Panel Case Front Panel Facia Panel Securing Screws Servicing13 .1 Annual Servicing Annual Servicing InspectionBurner Sensing Electrode 10 ±1Viewing Window Igniter Fig Changing ComponentsSpark and Sensing Electrodes Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Fan FigVenturi Fig Injector FigInsulation Fig Burner FigBurner Gasket Extension Piece Flue/Heat Exchanger Thermostat Sensor Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig DHW Temperature Sensor NTC FigPump Complete Fig Pump Head Only FigAutomatic Air Vent Fig Hall Effect Sensor Fig Pressure Gauge FigsPlate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig14.22 P.C.B. Fig Selector Switch FigGas Valve Fig Throttle Adjustment ScrewExpansion Vessel Fig Throttle Setting the Gas ValveSetting the Gas Valve CO2 check Flue Adaptor Test Point Plug Analyser ProbeElectrical Illustrated Wiring Diagram302 Short Parts ListShort Parts List 306Initial Fault Finding Checks Fault FindingError Codes Pump runs Error 133 flashingGo to section ‘A’ Turn the selector switch to Reset position for 5 secondsOpen DHW tap fully Turn selector switch toError 133 flashing Go to section ‘I’ Turn Domestic Hot WaterReplace water PCB X3 connector terminals 3Switch terminal Fan jammed or faulty winding Replace PCBReplace gas valve Check wiring Viewing WindowReplace sensor or PCB E28 Gas at burnerReplace PCB Is there 230V at Replace safety thermostatReplace sensor Page Page Condensing Boilers only Service Record Brooks House, Coventry Road, Warwick. CV34 4LL