Baxi Potterton BBU 15 HE manual Sealed Systems

Page 14

 

 

Temporary

 

 

Hose

Mains Water

Hose

Stop

Supply

Union

Valve

(Service Pipe)

 

 

 

 

 

Double

 

 

Check

 

 

Valve

 

 

Heating

 

 

System

4.0System Details

4.7Sealed Systems (cont)

4.Expansion Vessel. A diaphragm type expansion vessel to BS 4814:1 shall be fitted close to the inlet side of the pump. The connecting pipework should not be less than 15mm.

Pipework connecting the expansion vessel should not incorporate valves of any sort.

Methods of supporting the vessel are supplied by the vessel manufacturer.

The nitrogen or air charge pressure of the expansion vessel shall not be less than the hydrostatic head, (height of the top point of the system above the expansion vessel). To size the expansion vessel it is first necessary to calculate the volume of water in the system in litres. The following volumes may be used as a conservative guide to calculating the system volume.

Filling a Sealed Water System (Method 1)

Mains Topping Up Method

NOTE: This method of filling a sealed system may only be used if acceptable to Local Water Undertaking

Mains Water

Supply

Cistern

Filling a Sealed Water System (Method 2)

Cistern Filling Method

NOTE: Cistern to be supplied through a temporary connection from a service pipe or cold water distributing pipe

Fig. 7

Pressure Pump Reducing Valve (if required)

Stop

Valve

Heating

System

Fig. 8

Boiler Heat Exchanger:

1.55 litres

Small Bore Pipework:

1 litre per kW of system output

Micro Bore Pipework:

7 litre

Steel Panel Radiators:

8 litre per kW of system output

Low Water Capacity Radiators:

1 litre per kW of system output

Hot Water Cylinder:

1 litre per kW of system output

If the system is extended, the expansion vessel volume may have to be increased unless provision has been made for extension. Where a vessel of the calculated size is not available, the next available larger size should be used.

The boiler flow temperature is controlled at approx. 75°C.

The vessel size can now be determined from the information in table 1 where V = System volume in litres.

5.Cylinder. The hot water cylinder must be an indirect coiler type.

6.Method of Make Up. Provision shall be made for replacing water loss from the system either:-

a)From a make up vessel or tank mounted in a position higher than the top point of the system and connected through a non-return valve to the system on the return side of the hot water cylinder or the return side of all heat emitters.

or

b)Where access to a make up vessel would be difficult by using the mains top up method or a remote automatic pressurisation and make up unit.

7.Mains Connection. There shall be no connection to the mains water supply or to the water storage tank which supplies domestic hot water even through a non-return valve, without the approval of the Local Water Authority.

8.Filling Point. A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling.

The sealed primary circuits may be filled or replenished by means of a temporary connection between the circuit and a supply pipe, provided a ‘Listed’ double check valve or some other no less effective backflow prevention device is permanently connected at the inlet to the circuit and the temporary connection is removed after use.

Vessel Charge Pressure (bar)

0.5

1.5

Initial System Pressure (bar)

1.0

1.0

Expansion Vessel Volume (litres)

V x 0.11

V x 0.087

 

 

 

Table 1

The filling method adopted must be in accordance with all relevant water supply regulations and use approved equipment.

Your attention is drawn to: for GB: Guidance G24.2 and recommendation R24.2 of the Water Regulations Guide. for IE: the current edition of IS 813 “Domestic Gas Installations”.

14© Baxi Heating UK Ltd 2009

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Contents Baxi Bermuda BBU 15 HE 0086 Installer Notification Guidelines Scheme Members onlyCodes of Practice, most recent version should be used Important Installation, Commissioning, Service & RepairLegislation Safe Manual Handling Contents Description ContentsIntroduction General Layout Layout FigFlue Kit 10m & 12.5m a Technical Data Bermuda HE Cbbu 15 HETreatment of Water Circulating Systems System DetailsWater Circulating Systems There is a drain cock supplied in the plumbing kitStorage Systems PipeworkSystem Controls Sealed Systems Figs , 7 Sealed Systems Location Site RequirementsBuilders Opening Fig Fireplace Opening & SurroundFlue No Horizontal Runs are PermittedElectrical Supply Fig VentilationGas Supply Fig Electrical Connection Gas ConnectionCondensate Drain General Condensate Disposal FigCondensate Pump Operation Total volume of the sump is 1.5 litresCondensate Disposal From Boiler 500mm MinBoiler Internal Wiring Boiler Internal Illustrated Wiring DiagramFlue System InstallationInitial Preparation Barb ‘C’ Clip Air Cowl Air Duct Collar Ribs Terminal Cap Gas Connection Siting the BoilerWater Connections Electrical ConnectionCommissioning the Boiler Completion & CommissioningCompletion Test Point Annual Servicing Annual ServicingAnnual Servicing Inspection Changing Components Electrode Assembly FigChanging Components Spark Generator FigSpark Generator Plug Electrode Fan Injector Fan FigBurner Fig Burner Spark Generator Plug Gas Feed Pipe InjectorInjector Gas Valve Earth Wire Gas Valve FigPCB Fig Safety Thermostat FigFloat Switches Fig NTC FigFlue Sampling Point Display Control Knobs Setting the Gas ValveSetting the Gas Valve CO2 check Error Codes Fault FindingInitial Fault Finding Checks Switch for 5 seconds Error 110 flashingBurner lights Press the Service Reset Go to section ‘A’Terminals 1 Voltage at PCB X2 connector is Clean condensate drain systemX2 connector, is 230V AC across Spark gap and position Check wiringReplace Safety Thermostat Replace flame sensing electrode13.0 Short Parts List Short Parts ListPage Page Page GAS Boiler System Commissioning Checklist Service Record Date Energy Efficiency Checklist completed?Installer Details name, address and contact numbers Warranty & ServiceSerial Number Date of Installation After Sales Service 0844 871

BBU 15 HE specifications

The Baxi Potterton BBU 15 HE is a high-efficiency boiler designed to offer exceptional performance for both heating and hot water needs in residential settings. Known for its robust build quality and user-friendly features, this model is particularly favored for its versatility and reliability in various home environments.

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