Baxi Potterton 47-393-42, 47-393-40, 47-393-39 manual Setting the Gas Valve CO2 check, Throttle

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Central Heating

 

Domestic Hot Water

 

 

 

Temperature Control

Fig. 102

Temperature Control

 

 

 

Selector Switch

Display

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

2

 

12

 

 

 

 

 

3

 

11

 

 

 

 

 

4

 

 

10

Reset

 

 

2

5

 

 

9

 

 

 

PM

 

 

 

 

 

 

3

 

 

8

 

 

 

7

 

 

7

 

 

 

 

8

 

 

AM

 

 

 

￿0 4

9

 

0

5

 

 

 

bar

10

 

 

4

 

 

 

 

11

 

3

 

 

 

 

 

12

1

2

 

 

Central Heating

Domestic Hot Water

 

 

 

 

Temperature Control

Temperature Control

 

 

 

 

Fig. 103

Fig. 104

15.0Setting the Gas Valve

15.1Setting the Gas Valve (CO2 check)

IMPORTANT: The CO2 must be only be checked and adjusted to set the valve if a suitable calibrated combustion analyser is available, operated by a competent person - see Section 13.1

1.The combustion (CO2) may be checked after running the boiler for several minutes. To do this it is necessary to set the boiler to ‘Calibration Mode’.

2.Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.

3.Turn both control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back fully anticlockwise (Fig. 102).

4.The display will now alternate between ‘SF’ and the current boiler temperature and both green LEDs will flash (Figs. 103 & 104).

5.Turn the left hand knob fully clockwise. As the knob is turned the display will change, indicating the fan speed.

Fig. 105

Fig. 106

Fig. 107

Flue Adaptor Test

Point

Plug

Analyser Probe

Fig. 108

Offset

 

Adjustment Screw

Throttle

(cap fitted)

Adjustment Screw

 

 

(cover removed)

6.The display will show ‘00’, indicating maximum rate, then revert to ‘P ‘ alternating with the current boiler temperature (Figs. 105, 106 & 107).

7.Remove the plug from the flue sampling test point. Insert the analyser probe and allow sufficient time for the reading to settle (Fig. 108).

The CO2 should be 8.7% ± 0.2

8.It is possible to alter the CO2 by adjustment of the gas valve. Remove the plastic cover from the Throttle Adjustment Screw. At maximum rate the Throttle Adjustment Screw should be turned, using a suitable hexagon key, until the correct reading is obtained (Fig. 109). Turning clockwise will reduce the CO2. Anticlockwise will increase the CO2.

9.The CO2 must then be checked at minimum rate. Turn the left hand knob fully anti-clockwise. As the knob is turned the display will change, indicating the fan speed. When the display reads ‘ 0’ the boiler runs at minimum rate.

The CO2 should be 8.4% ± 0.2

Reduce CO2

Increase CO2

at min. rate

at min. rate

 

 

10. With the boiler on minimum, the Offset Adjustment

 

 

Screw must be altered, using a suitable hexagon key, after

Reduce CO2

Increase CO2 removing the cap (Fig. 109). Turning anti-clockwise will

at max. rate

at max. rate

reduce the CO2. Clockwise will increase the CO2.

 

 

If the CO2 is reset at minimum rate it must be rechecked at maximum rate again and adjusted if required. If the CO2 is reset at maximum rate it must be rechecked at minimum rate and adjusted if required.

Gas Valve

Fig. 109

Do not turn the adjustment screws more than 1/8 of a turn at a time. Allow the analyser reading to settle before any further adjustment

11.The ‘Calibration Function’ is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob.

12.Check the Combustion Performance (CO/CO2 ratio). This must be less than 0.004.

© Baxi Heating UK Ltd 2012

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Contents
Installation & Service Instructions Potterton Titanium Natural GasScheme Members only Installer Notification GuidelinesImportant Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version Technique Safe Manual HandlingGeneral PreparationContents Contents of Pack IntroductionDescription Expansion Vessel Automatic Air Vent Domestic Hot Water Mode Light DisplayGeneral Layout LayoutAppliance Operation Central Heating Mode FigDomestic Hot Water Mode Fig Frost Protection ModeTitanium 24, 28, 33 Technical Data22mm 15mm Dimensions and FixingsOrientation Tap Rail 32.5 mm Condensate Drain 65 mmBypass System DetailsInformation Central Heating CircuitSystem Filling and Pressurising Fig Expansion Vessel Central Heating onlyPressure Relief Valve Fig Domestic Hot Water Circuit Fig ShowersHard Water Areas Site Requirements LocationAt Least 1.5 7.2 Clearances Figs Electrical Supply Site RequirementVentilation of Compartments Gas SupplyCondensate Drain 500mm min 50mm perInsulation RunMinimum fall Boiler External runs & thoseFlue Horizontal Flues Each fitting to aid assemblyFlue Options Horizontal Flue SystemsApart Vertical FluesTwin & Vertical Flue Systems 120mm MinFlue Accessories Key Accessory Size Code NoTelescopic Internal Flue Kit Twin Flue Duct Adaptor Twin Flue ConnectionAir Duct Connection Flue Duct Connection Boiler Adaptor Terminal Guard Fig Flue DimensionsFor Roof Terminals Flue TrimRing Bracket Plume DisplacementPlume Displacement Kit Fig Elbow/Plume Outlet AssemblyExample Flue Lengths OK 28/33/40Determining 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 FlushingFitting the Filling Loop Kit Fitting The Boiler Fitting the Pressure Relief Discharge Pipe FigCondensate Drain see section Wall Thickness Waste Flue Fitting The FlueWall Thickness Flue Elbow Ensure Elbow is fully engaged into Boiler AdaptorInner Flue Support Bracket 25mm Extension Cut EndEnsure Extension is fully engaged into Boiler Adaptor Preliminary Electrical Checks Making The Electrical ConnectionsScrew Pump Automatic Air Vent Selector Switch DisplayCommissioning Commissioning the BoilerPressure Setting the Timer Completion CompletionCase Front Panel Facia Panel Servicing 13 .1 Annual ServicingAnnual Servicing Inspection 10 ±1 Burner Sensing ElectrodeViewing Window Changing Components Igniter FigSpark and Sensing Electrodes Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Fan FigVenturi Fig Injector FigBurner Fig Insulation FigBurner Gasket Extension Piece Flue/Heat Exchanger Thermostat Sensor Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig DHW Temperature Sensor NTC FigPump Head Only Fig Pump Complete 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 FigThrottle Adjustment Screw Gas Valve FigExpansion 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 306Fault Finding Initial Fault Finding ChecksError 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 safety thermostat Replace PCB Is there 230V atReplace sensor Page Page GAS Boiler System Commissioning Checklist Service Record Potterton
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