Baxi Potterton G.C.No 47 393 22 Vertical Flues, Twin & Vertical Flue Systems, 120mm Min, Apart

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Vertical Flues

8.0 Flue Options

(ii)

(i)

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

	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
apart		91.5° bend		0.50 metres
		91.5° bend		0.50 metres
Y	The elbow supplied with the standard horizontal telescopic
	The elbow supplied with the standard horizontal telescopic
	flue kit is not included in any equivalent length calculations
	NOTE: Flue length is measured from point (i) to (ii) as
1m Min to	shown.
15m Max

(ii)

(i)

Vertical

Flues

(Twin Pipe)

600mm Min apart

T

1m Min

to

15m Max

Mini Terminal on Air Duct (sited in loft)

Total Equivalent Length =

A+B+C+1x90°Bend

All vertical and angled runs must be included, 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)
1 metre for each 91.5° bend
0.5 metre for each 135° bend

B

Roof

Terminal

C

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

This bend is equivalent to 1 metre

A

(i)

		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
91.5°bend	0.5m	2	1.0m

	Equivalent Length Flue Duct = 6.5m

20© Baxi Heating UK Ltd 2011

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Contents Installation & Service Instructions 0086 Installer Notification Guidelines Scheme Members onlyCodes of Practice refer to the most recent version Important Installation, Commissioning, Service & RepairLegislation Safe Manual Handling GeneralPreparation TechniqueContents Description Contents of PackIntroduction General Layout LayoutPump Protection Frost Protection ModeAppliance Operation Technical Data Promax Combi 24, 28Dimensions and Fixings OrientationTap Rail 32.5 mm Condensate Drain 65 mmSystem Details InformationCentral Heating Circuit BypassPressure 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 Site Requirement Ventilation of CompartmentsGas Supply Electrical Supply Condensate Drain Flue Flue terminal guardEach fitting to aid assembly Flue OptionsHorizontal Flue Systems Horizontal FluesVertical Flues Twin & Vertical Flue Systems120mm Min ApartTelescopic Internal Flue Kit Flue AccessoriesKey Accessory Size Code No Air Duct Connection Flue Duct Connection Boiler Adaptor Twin Flue Duct AdaptorTwin Flue Connection Flue Dimensions For Roof TerminalsFlue Trim Terminal Guard FigMetres Ring Adaptor Plume DisplacementPlume Displacement Kit Fig 28/33 Determining Permissible LengthsExample 5121368General Fitting Notes 30mmElbow to allow the flue to be installed as shown 60Ø extension piece. It must be secured using twoUsing a suitable bit e.g mm, drill through Extension and outlet. Secure using two of the screwsInstallation Unpacking & Initial PreparationFlushing After considering the site requirementsFitting The Boiler Fitting the Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connectionsFitting The Flue Wall Thickness WasteFlue Elbow Ensure Elbow is fully Engaged into BoilerEnsure 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 Commissioning the BoilerPressure Case Front Panel Facia Panel CompletionCompletion Servicing 13 .1 Annual ServicingAnnual Servicing Inspection Case Front Panel Facia Panel Securing ScrewsViewing Window 10 ±1Burner Sensing Electrode Spark and Sensing Electrodes Fig Changing ComponentsIgniter Fig Fan Fig Venturi FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorBurner Gasket Extension Piece Burner FigInsulation Fig Central Heating Temperature Sensor NTC Fig Safety Thermostat FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor FigAutomatic Air Vent Fig Pump Head Only FigPump Complete Fig Pressure Gauge Figs Hall Effect Sensor FigDiverter Valve Motor Unit & Assembly Fig Plate Heat Exchanger FigSelector Switch Fig 14.22 P.C.B. FigExpansion Vessel Fig Throttle Adjustment ScrewGas Valve Fig Setting the Gas Valve Setting the Gas Valve CO2 checkFlue Adaptor Test Point Plug Analyser Probe ThrottleIllustrated Wiring Diagram ElectricalShort Parts List Short Parts List306 302Error Codes Fault FindingInitial Fault Finding Checks Error 133 flashing Go to section ‘A’ Turn the selector switch toReset position for 5 seconds Pump runsTurn selector switch to Error 133 flashing Go to section ‘I’Turn Domestic Hot Water Open DHW tap fullyPCB X3 connector terminals 3 Switch terminalFan jammed or faulty winding Replace PCB Replace waterCheck wiring Viewing Window Replace sensor or PCB E28Gas at burner Replace gas valveReplace sensor Replace safety thermostatReplace PCB Is there 230V at Page Page Condensing Boilers only Service Record Brooks House, Coventry Road, Warwick. CV34 4LL