Electrode Position, 10 ±1 | Potthof & Co 28kw, 24kw, 33kw instruction

Burner

Sensing Electrode

			±	1
	.	5	±
7	.	5
7

5 . 0 ±

4

Viewing Window

Spark Ignition

Electrode

10 ±1

		13.0 Servicing

			Annual Servicing - Inspection (Cont)
	13.2
6.		Undo the nut on the gas inlet pipe to the venturi (Fig. 77)
and pull the sensing pipe off the fan.
7.		Disconnect the electrode leads, noting their position, and
the fan electrical plugs.
8.		Undo the four nuts retaining the combustion box cover
to the heat exchanger.
9.		Carefully draw the fan, collector and cover assembly
forward, being careful to retain the injector in the venturi

Electrode Position

Fan, Collector and Cover

Assembly

Electrode

Leads

Fig. 76

Venturi

Injector

	Threaded	Fig. 78
	Bush
Fig. 77	Gas Inlet Pipe
Hall Effect
Sensor	Blanking	Cold Water
	Blanking	Cold Water
	Cap	Inlet Tap

Restricter

Hydraulic Inlet

Assembly

Fig. 79

Filter

(Figs. 76 & 77).
10.	Clean any debris from the heat exchanger and check
that the gaps between the tubes are clear.
11.	Inspect the burner, electrodes and insulation, cleaning or
replacing if necessary. Clean any dirt or dust from the air
box.
12.	Reassemble in reverse order.

NOTE: The sensing pipe must be reconnected to the fan, not the venturi.

DHW Filter (Fig. 79)

13.If the flow of domestic hot water is diminished, it may be necessary to clean the filter.

14.Initially check the cold water inlet tap filter.

15.Turn the tap off and draw off from a hot tap. Undo the blanking cap and remove the threaded bush (Fig. 78).

16.Extract the filter and rinse thoroughly in clean water. Reassemble and check the flow. If required clean the restricter filter as described below.

17.Pull off the Hall Effect sensor. Undo the restricter from the inlet/return manifold (Fig. 79).

18.Rinse the filter thoroughly in clean water and reassemble in reverse order.

19.Turn the selector switch fully anticlockwise against the spring pressure to the reset position and hold for 5 seconds to reset the boiler.

20.Complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication and then hand it back to the user.

© Baxi Heating UK Ltd 2012

41

Image 41

Potthof & Co 28kw, 24kw, 33kw manual Electrode Position, 10 ±1

Contents

Installation & Service Instructions Benchmark Scheme Natural Gas Scheme Members only Installer Notification Guidelines Codes of Practice refer to the most recent version Important Installation, Commissioning, Service & RepairLegislation General Safe Manual HandlingPreparation Technique Contents Description Contents of PackIntroduction Layout General LayoutExpansion Vessel Automatic Air Vent Circulation Pump Drain Off Point Domestic Hot Water Mode Fig Central Heating Mode FigFrost Protection Mode Appliance Operation Gold Combi 24, 28 & 33 HE a Technical Data Dimensions and Fixings Information System DetailsCentral Heating Circuit Bypass Expansion Vessel Central Heating only Safety Pressure Relief Valve FigSystem Filling and Pressurising Fig Hard Water Areas Domestic Hot Water Circuit FigShowers Location Site RequirementsClearances Figs At least Ventilation of Compartments Site RequirementGas Supply Electrical Supply Pipe run Minimum Fall PerPer Metre Run 500mm min Minimum Fall50mm per Minimum fall Run Flue Plume Displacement KitBelow windows or openings on pitched roofs 2000 Likely flue positions requiring a flue terminal guard Total equivalent length = +B+C+2x90Bends Flue Options Total Equivalent Length = +B+C+1x90Bend Telescopic Flue inc. elbow Flue AccessoriesKey Accessory Size Code No Air Duct Connection Flue Duct Connection Boiler Adaptor Twin Flue Duct AdaptorTwin Flue Connection For Roof Terminals Flue DimensionsFlue Trim Terminal Guard Fig Plume Displacement Kit Fig Plume Displacement Determining Permissible Lengths 28/33Example Elbow 30mm 50mmGeneral Fitting Notes 60Ø extension piece. It must be secured using two Elbow to allow the flue to be installed as shownUsing a suitable bit e.g mm, drill through Extension and outlet. Secure using two of the screws Unpacking & Initial Preparation InstallationFlushing After considering the site requirements Fitting the Filling Loop Kit Fitting The Boiler Fitting the Safety Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connections Wall Thickness Flue Elbow Fitting The FlueEnsure Elbow is fully engaged into Boiler Adaptor Wall Thickness Waste Flue Ensure 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 Selector Switch DisplayCommissioning the Boiler Screw Pump Automatic Air Vent Temperature Control Gas Pressure Test Point Gas Valve Temperature Control Selector Switch DisplayCheck the Operational Working Gas Inlet Pressure It is necessary to set the boiler to ‘Calibration Mode’ Setting the Timer Case Front Panel Facia Panel CompletionCompletion Annual Servicing Inspection Servicing13 .1 Annual Servicing 10 ±1 Electrode Position Spark and Sensing Electrodes Fig Changing ComponentsIgniter Fig Venturi Fig Fan FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Extension Piece Burner FigInsulation Fig Safety Thermostat Fig Central Heating Temperature Sensor NTC FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor Fig Automatic Air Vent Fig Pump Head Only FigPump Complete Fig Pressure Relief Valve Fig Pressure Gauge FigsHall Effect Sensor Fig Plate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig 14.22 P.C.B. Fig Selector Switch Fig Expansion Vessel Fig Gas Valve Fig Setting the Gas Valve CO2 check Setting the Gas ValveFlue Adaptor Test Point Plug Analyser Probe CO2 should be 8.4% ± Reduce CO2 Electrical Illustrated Wiring Diagram Short Parts List Short Parts List426 315316 311 404419 422 400 415 Error Codes Fault FindingInitial Fault Finding Checks Go to section ‘A’ Turn the selector switch to Error 133 flashingReset position for 5 seconds Pump runs Turn Domestic Hot Water Error 133 flashing Go to section ‘I’Open DHW tap fully Close DHW tap Switch terminal PCB X3 connector terminals 3Fan jammed or faulty winding Replace PCB Replace water Replace sensor or PCB E28 Check wiring Viewing WindowGas at burner Replace gas valve Replace sensor Replace safety thermostatReplace PCB Is there 230V at Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton