Potthof & Co 24kw Appliance Operation, Central Heating Mode Fig, Domestic Hot Water Mode Fig

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Central Heating Circuit

26

25

18 24 22

21

16

Fig. 2

1

27

 

 

2

 

3

4

 

 

7

20

5

6

 

 

 

8

 

 

9

 

23

11

 

 

 

 

10

 

 

17

15 14 13 12

3.0Appliance Operation

3.1Central Heating Mode (Fig. 2)

1.With a demand for heating, the pump circulates water through the primary circuit.

2.Once main burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the temperature sensor.

3.When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling). The pump continues to run during this period.

4.When the demand is satisfied the burner is extinguished and the pump continues to run for a period of 3 minutes (Pump Overrun).

3.2Domestic Hot Water Mode (Fig. 3)

1.

Priority is given to the domestic hot water supply. A

demand at a tap or shower will override any central heating

requirement.

2.

The flow of water will operate the Hall Effect Sensor

which requests the 3 way valve to change position. This will

Key

1

Primary Heat Exchanger

15 Domestic Hot Water Outlet

2

Burner

16

Heating Flow

3

Ignition Electrodes

17

Pressure Gauge

4

Flame Sensing Electrode

18

Water Pressure Sensor

5

Gas Valve

20

Fan

6

Pump

21

Diverter Valve Assembly

7

Automatic Air Vent

22

Diverter Valve Motor

8

Plate Heat Exchanger/Automatic By-pass

23 Domestic Hot Water Flow Temperature Sensor

9

Flow Sensor with Filter & Regulator

24

Safety Thermostat

10

Safety Pressure Relief Valve

25 Central Heating Temperature Sensor

11

Boiler Drain Point

26

Expansion Vessel

12

Heating Return

27 Heat Exchanger Air Vent

13

Cold Water Inlet On/Off Valve and Filter

 

 

14

Gas Inlet

 

 

allow the pump to circulate the primary water through the

DHW plate heat exchanger.

3. The burner will light automatically and the temperature of

the domestic hot water is controlled by the temperature

sensor.

4. When the domestic hot water demand ceases the burner

will extinguish and the diverter valve will remain in the

domestic hot water mode, unless there is a demand for

central heating.

IMPORTANT: When the selector switch is in the ‘0’ (Off) position the electrical supply to the boiler is isolated. The boiler will not operate and the integral timer will

Domestic Hot Water Circuit

27

 

 

26

3

4

 

 

 

 

 

 

20

5

 

 

 

 

 

 

 

25

 

 

18

 

24

 

 

 

 

 

 

 

 

22

 

9

 

 

 

 

 

21

 

23

 

 

 

 

 

1

2

7

6

8

11

10

17

require resetting once the selector switch is set to either Position (i) or Position (ii).

3.3Frost Protection Mode

1.The frost protection mode is integral to the appliance and functions only with the selector switch (see Section 2.1) in the domestic hot water and central heating position. If the system temperature falls below 5° C then the boiler will fire on its minimum setting until a flow temperature of 30° C is reached.

3.4Pump Protection

1.With the selector switch (see Section 2.1) in either the central heating or central heating and domestic hot water position, the pump will automatically operate for 1 minute in every 24 hours to prevent sticking.

16

15

14

13

12

Fig. 3

© Baxi Heating UK Ltd 2012

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Contents Installation & Service Instructions Benchmark Scheme Natural GasScheme Members only Installer Notification GuidelinesImportant Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version General Safe Manual HandlingPreparation TechniqueContents Contents of Pack IntroductionDescription Layout General LayoutExpansion Vessel Automatic Air Vent Circulation Pump Drain Off PointDomestic Hot Water Mode Fig Central Heating Mode FigFrost Protection Mode Appliance OperationGold Combi 24, 28 & 33 HE a Technical DataDimensions and Fixings Information System DetailsCentral Heating Circuit BypassSafety Pressure Relief Valve Fig System Filling and Pressurising FigExpansion Vessel Central Heating only Domestic Hot Water Circuit Fig ShowersHard Water Areas Location Site RequirementsClearances Figs At leastVentilation of Compartments Site RequirementGas Supply Electrical SupplyPipe run Minimum Fall PerPer Metre RunMinimum Fall 50mm per500mm min Minimum fall RunFlue Plume Displacement KitBelow windows or openings on pitched roofs 2000 Likely flue positions requiring a flue terminal guardTotal equivalent length = +B+C+2x90Bends Flue OptionsTotal Equivalent Length = +B+C+1x90Bend Flue Accessories Key Accessory Size Code NoTelescopic Flue inc. elbow Twin Flue Duct Adaptor Twin Flue ConnectionAir Duct Connection Flue Duct Connection Boiler Adaptor For Roof Terminals Flue DimensionsFlue Trim Terminal Guard FigPlume Displacement Kit Fig Plume DisplacementDetermining Permissible Lengths 28/33Example Elbow50mm General Fitting Notes30mm 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 screwsUnpacking & Initial Preparation InstallationFlushing After considering the site requirementsFitting the Filling Loop Kit Fitting The Boiler Fitting the Safety Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connectionsWall Thickness Flue Elbow Fitting The FlueEnsure Elbow is fully engaged into Boiler Adaptor Wall Thickness Waste FlueInner Flue Support Bracket 25mm Extension Cut EndEnsure Extension is fully engaged into Boiler Adaptor Making The Electrical Connections Preliminary Electrical ChecksTerminal Block Cover Cable Clamp Commissioning Selector Switch DisplayCommissioning the Boiler Screw Pump Automatic Air VentTemperature 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 Completion CompletionCase Front Panel Facia Panel Servicing 13 .1 Annual ServicingAnnual Servicing Inspection 10 ±1 Electrode PositionChanging Components Igniter FigSpark and Sensing Electrodes Fig Venturi Fig Fan FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorBurner Fig Insulation FigExtension Piece Safety Thermostat Fig Central Heating Temperature Sensor NTC FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor FigPump Head Only Fig Pump Complete FigAutomatic Air Vent Fig Pressure Gauge Figs Hall Effect Sensor FigPressure Relief Valve Fig Plate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig14.22 P.C.B. Fig Selector Switch FigExpansion Vessel Fig Gas Valve FigSetting the Gas Valve CO2 check Setting the Gas ValveFlue Adaptor Test Point Plug Analyser Probe CO2 should be 8.4% ± Reduce CO2Electrical Illustrated Wiring DiagramShort Parts List Short Parts List426 315316 311 404419 422 400 415Fault Finding Initial Fault Finding ChecksError Codes Go to section ‘A’ Turn the selector switch to Error 133 flashingReset position for 5 seconds Pump runsTurn Domestic Hot Water Error 133 flashing Go to section ‘I’Open DHW tap fully Close DHW tapSwitch terminal PCB X3 connector terminals 3Fan jammed or faulty winding Replace PCB Replace waterReplace sensor or PCB E28 Check wiring Viewing WindowGas at burner Replace gas valveReplace safety thermostat Replace PCB Is there 230V atReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton
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