Potthof & Co 33kw, 24kw, 28kw manual Total Equivalent Length = +B+C+1x90Bend

Page 22

Vertical

Flues

(ii)

(i)

IMPORTANT: All flue systems must be securely supported at least once every metre. Suitable pipe supports are available as accessories.

1m Min to

15m Max

	8.0	Flue Options
	8.2	Twin & Vertical Flue Systems
	1. Maximum permissible equivalent flue lengths are:-
			(60/100)	(80/125)
	Vertical Concentric		10 metres	20 metres
	Vertical Twin Pipe		15 metres
	2. Any additional “in line” bends in the flue system must be
	taken into consideration.
	Their equivalent lengths are:-
	Concentric Pipes:
		135° bend		0.5 metres
		93° bend		1.0 metres
	Twin Flue Pipe
120mm Min		135° bend		0.25 metres
120mm Min		91.5° bend		0.50 metres
apart		91.5° bend		0.50 metres
	The elbow supplied with the standard horizontal telescopic
	flue kit is not included in any equivalent length calculations
Y	NOTE: Flue length is measured from point (i) to (ii) as
Y	shown.
	shown.

(ii)

(i)

T

Vertical Flues

(Twin Pipe)

Total Equivalent Length =

A+B+C+1x90°Bend

Roof

All vertical and angled runs must be included,

Terminal

measured from the boiler adaptor (point X) to the

joint with the flue terminal (point Y). One 91.5°

bend or two 135° bends can be included without

reduction of the flue length.

If further elbows are required the flue length must

be reduced by the following amounts:-

1 metre for each 91.5° bend

(ii)

0.5 metre for each 135° bend

C

B

This bend is equivalent to 1 metre

A

(i)

22© Baxi Heating UK Ltd 2012

600mm Min			Mini Terminal
apart			on Air Duct
apart			on Air Duct
			(sited in loft)
			(sited in loft)

1m Min

to

15m Max

Q

	The total equivalent
	length for this example
		is	= 6.5 metres.

			AIR DUCT
	Equivalent		No of		Sub total
	Length Value		fittings/pipes
1m extension	1m		5		5.0m
135°bend	0.25m		2		0.5m

91.5°bend	0.5m		2		1.0m

	Equivalent Length Air Duct = 6.5m


			FLUE DUCT
	Equivalent		No of		Sub total
	Length Value		fittings/pipes
1m extension	1m		5		5.0m
135°bend	0.25m		2		0.5m

91.5°bend	0.5m		2		1.0m

	Equivalent Length Flue Duct = 6.5m

Image 22

Contents Installation & Service Instructions Natural Gas Benchmark SchemeInstaller Notification Guidelines Scheme Members onlyLegislation Important Installation, Commissioning, Service & RepairCodes of Practice refer to the most recent version Preparation Safe Manual HandlingGeneral TechniqueContents Introduction Contents of PackDescription Expansion Vessel Automatic Air Vent General LayoutLayout Circulation Pump Drain Off PointFrost Protection Mode Central Heating Mode FigDomestic Hot Water Mode Fig Appliance OperationTechnical Data Gold Combi 24, 28 & 33 HE aDimensions and Fixings Central Heating Circuit System DetailsInformation BypassSystem Filling and Pressurising Fig Safety Pressure Relief Valve FigExpansion Vessel Central Heating only Showers Domestic Hot Water Circuit FigHard Water Areas Clearances Figs Site RequirementsLocation At leastGas Supply Site RequirementVentilation of Compartments Electrical SupplyPer Metre PerPipe run Minimum Fall Run50mm per Minimum Fall500mm min Run Minimum fallBelow windows or openings on pitched roofs 2000 Plume Displacement KitFlue Likely flue positions requiring a flue terminal guardFlue Options Total equivalent length = +B+C+2x90BendsTotal Equivalent Length = +B+C+1x90Bend Key Accessory Size Code No Flue AccessoriesTelescopic Flue inc. elbow Twin Flue Connection Twin Flue Duct AdaptorAir Duct Connection Flue Duct Connection Boiler Adaptor Flue Trim Flue DimensionsFor Roof Terminals Terminal Guard FigPlume Displacement Plume Displacement Kit FigExample 28/33Determining Permissible Lengths ElbowGeneral Fitting Notes 50mm30mm Using a suitable bit e.g mm, drill through Elbow to allow the flue to be installed as shown60Ø extension piece. It must be secured using two Extension and outlet. Secure using two of the screwsFlushing InstallationUnpacking & Initial Preparation After considering the site requirementsFitting the Filling Loop Kit Condensate Drain see section Fitting the Safety Pressure Relief Discharge Pipe FigFitting The Boiler Tighten all the connectionsEnsure Elbow is fully engaged into Boiler Adaptor Fitting The FlueWall Thickness Flue Elbow Wall Thickness Waste Flue25mm 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 Selector Switch DisplayCommissioning Screw Pump Automatic Air VentCheck the Operational Working Gas Inlet Pressure Temperature Control Selector Switch DisplayTemperature Control Gas Pressure Test Point Gas Valve It is necessary to set the boiler to ‘Calibration Mode’Setting the Timer Completion CompletionCase Front Panel Facia Panel 13 .1 Annual Servicing ServicingAnnual Servicing Inspection Electrode Position 10 ±1Igniter Fig Changing ComponentsSpark and Sensing Electrodes Fig Injector Fig Fan FigVenturi Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorInsulation Fig Burner FigExtension Piece DHW Temperature Sensor NTC Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig Flue/Heat Exchanger Thermostat Sensor FigPump Complete Fig Pump Head Only FigAutomatic Air Vent Fig Hall Effect Sensor Fig Pressure Gauge FigsPressure Relief Valve Fig Diverter Valve Motor Unit & Assembly Fig Plate Heat Exchanger FigSelector Switch Fig 14.22 P.C.B. FigGas Valve Fig Expansion Vessel FigFlue Adaptor Test Point Plug Analyser Probe Setting the Gas ValveSetting the Gas Valve CO2 check CO2 should be 8.4% ± Reduce CO2Illustrated Wiring Diagram Electrical426 Short Parts ListShort Parts List 315316 311 404419 422 400 415Initial Fault Finding Checks Fault FindingError Codes Reset position for 5 seconds Error 133 flashingGo to section ‘A’ Turn the selector switch to Pump runsOpen DHW tap fully Error 133 flashing Go to section ‘I’Turn Domestic Hot Water Close DHW tapFan jammed or faulty winding Replace PCB PCB X3 connector terminals 3Switch terminal Replace waterGas at burner Check wiring Viewing WindowReplace sensor or PCB E28 Replace gas valveReplace PCB Is there 230V at Replace safety thermostatReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton