Baxi Potterton G.C.No 47 393 22, G.C.No 47 393 23 Setting the Gas Valve CO2 check, Throttle

Page 47

x 2

Central Heating

 

Domestic Hot Water

Temperature Control

Fig. 102

Temperature Control

Selector Switch

Display

 

 

 

Reset

 

 

 

2

 

 

1

 

 

 

 

3

 

 

 

0

4

 

 

 

 

bar

 

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 2011

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Contents Installation & Service Instructions 0086 Scheme Members only Installer Notification GuidelinesCodes of Practice refer to the most recent version Important Installation, Commissioning, Service & RepairLegislation Technique Safe Manual HandlingGeneral PreparationContents Description Contents of PackIntroduction Layout General LayoutPump Protection Frost Protection ModeAppliance Operation Promax Combi 24, 28 Technical Data32.5 mm Condensate Drain 65 mm Dimensions and FixingsOrientation Tap RailBypass System DetailsInformation Central Heating CircuitPressure Relief Valve Fig System Filling and Pressurising FigExpansion Vessel Central Heating only Hard Water Areas Domestic Hot Water Circuit FigShowers At Least 1.5 7.2 Clearances Figs Site RequirementsLocation 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 MinTelescopic Internal Flue Kit Flue AccessoriesKey Accessory Size Code No Air Duct Connection Flue Duct Connection Boiler Adaptor Twin Flue Duct AdaptorTwin Flue Connection Terminal Guard Fig Flue DimensionsFor Roof Terminals Flue TrimMetres Ring Adaptor Plume DisplacementPlume Displacement Kit Fig 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 ElbowEnsure Extension is fully engaged into Boiler Adaptor Inner Flue Support Bracket25mm Extension Cut End Terminal Block Cover Cable Clamp Making The Electrical ConnectionsPreliminary Electrical Checks Commissioning the Boiler CommissioningPressure Case Front Panel Facia Panel CompletionCompletion Case Front Panel Facia Panel Securing Screws Servicing13 .1 Annual Servicing Annual Servicing InspectionViewing Window 10 ±1Burner Sensing Electrode Spark and Sensing Electrodes Fig Changing ComponentsIgniter Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Fan FigVenturi Fig Injector FigBurner Gasket Extension Piece Burner FigInsulation Fig Flue/Heat Exchanger Thermostat Sensor Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig DHW Temperature Sensor NTC FigAutomatic Air Vent Fig Pump Head Only FigPump Complete Fig Hall Effect Sensor Fig Pressure Gauge Figs Plate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig14.22 P.C.B. Fig Selector Switch FigExpansion Vessel Fig Throttle Adjustment ScrewGas Valve 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 306Error Codes Fault FindingInitial Fault Finding Checks 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 sensor Replace safety thermostatReplace PCB Is there 230V at Page Page Condensing Boilers only Service Record Brooks House, Coventry Road, Warwick. CV34 4LL
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