Potthof & Co 28kw, 24kw, 33kw manual Domestic Hot Water Circuit Fig, Showers, Hard Water Areas

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Other Tap

Outlets

Expansion

Boiler

 

Vessel*

 

Check

Valve*

6.0System Details

6.8Domestic Hot Water Circuit (Fig. 7)

1.All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations.

2.Your attention is drawn to:

for GB: Guidance G17 to G24 and recommendation R17 to R24 of the Water Regulations Guide.

for IE: the current edition of I.S. 813 “Domestic Gas Installations”.

3. The Water Regulations recommendations for England and

Wales prohibits backflow from appliances into the

wholesome water supply due to thermal expansion.

However this type of instantaneous combination boiler, with

less than 15 litres of stored capacity, does not require any

Pressure Reducer Valve*

Stop Tap

To Hot

Taps

*See 6.8 for instances when these items may be required

backflow prevention device as any thermal expansion is

accommodated within the appliance.

It is possible in certain circumstances that other cold water

demands (e.g. washing machines, flushing of W.C.s) may

affect the DHW function of the boiler. In these instances the

fitting of a backflow prevention device and expansion vessel

is recommended.

4. Also if there is an existing check valve, loose jumpered

Fig. 7

stop cock, water meter or water treatment device already

fitted to the wholesome water supply connected to the

boiler domestic hot water (DHW) inlet supply then a

suitable expansion device may be required.

5. The boiler’s maximum working mains pressure is 8 bar,

therefore all pipework, connections, fittings, etc. should be

suitable for pressures in excess of 8 bar. A pressure reducing

valve must be fitted for pressures in excess of 8 bar. The

manufacturer of any outlet fittings, such as a shower valve,

may require a lower maximum pressure. The pressure

reduction must take account of all fittings connected to the

DHW system.

6.9

Showers

1.If a shower control is supplied from the appliance it should be of the thermostatic or pressure balanced type. Thermostatic type shower valves provide the best comfort and guard against water at too high a temperature. Existing controls may not be suitable - refer to the shower valve manufacturer.

6.10Hard Water Areas

1.If the area of the installation is recognised as a HARD WATER AREA then a suitable device should be fitted to treat the mains water supply to the boiler. Contact your Water Distribution Company for advice on suitable devices.

14© Baxi Heating UK Ltd 2012

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Contents Installation & Service Instructions Natural Gas Benchmark SchemeInstaller Notification Guidelines Scheme Members onlyCodes of Practice refer to the most recent version Important Installation, Commissioning, Service & RepairLegislation Preparation Safe Manual HandlingGeneral TechniqueContents Description Contents of PackIntroduction 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 BypassExpansion Vessel Central Heating only Safety Pressure Relief Valve FigSystem Filling and Pressurising Fig Hard Water Areas Domestic Hot Water Circuit FigShowers Clearances Figs Site RequirementsLocation At leastGas Supply Site RequirementVentilation of Compartments Electrical SupplyPer Metre PerPipe run Minimum Fall Run500mm min Minimum Fall50mm per 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 Telescopic Flue inc. elbow Flue AccessoriesKey Accessory Size Code No Air Duct Connection Flue Duct Connection Boiler Adaptor Twin Flue Duct AdaptorTwin Flue Connection Flue Trim Flue DimensionsFor Roof Terminals Terminal Guard FigPlume Displacement Plume Displacement Kit FigExample 28/33Determining Permissible Lengths Elbow30mm 50mmGeneral Fitting Notes 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 FlueEnsure 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 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 Case Front Panel Facia Panel CompletionCompletion Annual Servicing Inspection Servicing13 .1 Annual Servicing Electrode Position 10 ±1Spark and Sensing Electrodes Fig Changing ComponentsIgniter Fig Injector Fig Fan FigVenturi Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorExtension Piece Burner FigInsulation Fig DHW Temperature Sensor NTC Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig Flue/Heat Exchanger Thermostat Sensor FigAutomatic Air Vent Fig Pump Head Only FigPump Complete Fig Pressure Relief Valve Fig Pressure Gauge FigsHall Effect Sensor 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 415Error Codes Fault FindingInitial Fault Finding Checks 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 sensor Replace safety thermostatReplace PCB Is there 230V at Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton
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