Bosch Appliances 28i junior, 24i junior manual Preheat and DHW Function

Page 58

57

PREHEAT AND DHW FUNCTION

INSTALLATION

FAULT FINDING

& DIAGRAMS

Tap open

(recognised

by flow turbine)

Wait

5 seconds

DOMESTIC

HOT

WATER

DEMAND

(priority over

all other

demands)

Gas valve OFF.

Burner shut down if primary temperature 94°C

(until 84°C)

Over temperature shut- down if water tempera- ture is 8°C above set value.

Fan (& gas) modulation to achieve set temperature (40-60°C)

DEMAND

END

& SERVICING INSTRUCTIONS FOR

POWER

 

BLUE

SWITCH

 

LIGHT

 

ON

 

ON

ECO button

not

illuminated *

(ie preheat requested)

AND

Diverter valve

 

Fan to

 

IGNITION

 

GREEN

in DHW

 

 

 

FLAME

 

start

 

SEQUENCE

 

position

 

 

 

LIGHT

 

speed.

 

(see detail)

 

Pump ON.

 

 

 

ON

 

 

 

 

 

Gas valve

OFF

Pump run 3

minutes

Fan run 30

seconds

WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)

*Set by

pressing ECO button. If pro- grammer is fitted this is set by a combination of programmer (DHW) demand and ECO button.

20minutes since last pre- heat demand

AND

temperature at least 10° below set point.

PREHEAT

DEMAND

LOCKOUT

 

 

IGNITION SEQUENCE

 

 

 

 

 

Fan (& gas)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

modulation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to achieve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

(55°C)

 

 

 

 

Spark

 

 

 

 

BURNER

 

 

 

 

 

 

 

 

 

 

 

 

 

ignition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LIT?

 

 

 

 

 

 

 

 

 

 

 

4 seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

NO

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5th

 

 

 

 

Stop spark.

 

 

 

 

 

 

 

 

 

 

 

 

 

Wait

 

 

 

 

 

 

 

 

 

 

attempt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEMAND

END

Gas valve

OFF

Stop pump

Stop fan

PREHEAT AND DHW FUNCTION

Image 58
Contents Natural GAS Appliance is for USE withNatural GAS or L.P.G. Cat II 2H3P Type C13 & C33 Liquid Petroleum GASContact Information Installation & Servicing Instructions Installation & Servicing InstructionsContents Safety Precautions Installation RegulationsGeneral Information SpecificationsGeneral Information Standard PackageTechnical Data Technical DataGAS Inlet Connection 22mm Layout & ComponentsLayout & Components Compression Trap / SyphonLayout & Components Cleaning the Primary System Cleaning Primary SystemsCleaning Primary Systems Open all drain cocks and drainMains Supply Mains SupplyWater Systems & Pipework Water Systems & PipeworkCondensate Pipework Condensate PipeworkPressure Relief Pipework Pressure Relief PipeworkBoiler Location Clearances Ventilation Free Compartments Installation ClearancesServicing Clearances Vented Compartment Boiler Location & ClearancesBoiler Location BathroomsConnections Plumbing ManifoldPlumbing Manifold Heating System 22mm compression fittingsDrwg Terminal Position Distance Flue Terminal PositionsFlue Terminal Positions From a terminal facing the terminal 1200mmFlue Options Flue OptionsImportant Handling Instructions Unpacking Wall Frame Ancillary ItemsAncillary Items Unpacking Wall FrameWall Mounting Template Flue Opening Wall Mounting Plate Flue OpeningUnpacking the Appliance Unpacking the ApplianceBoiler Connections Boiler ConnectionsGAS and Water Connections 189mm 93mm Edge of case 200mm Flue InstallationFlue Installation 250mm min Turret Clamp FlueAddition of Flue Bends Fitting the Elbow Assembling the FlueFitting the Flue Additional Notes and RemindersCondensate Connection Condensate ConnectionCondensate Connection Electrics ElectricsPosition of Wired Components Position of Wired ComponentsChecks PRE-COMMISSIONINGPRE-COMMISSIONING Checks Filling the System Filling the SystemStarting the Appliance Switching the appliance on/offStarting the Appliance Water Treatment KEYWater Treatment Commissioning CommissioningFinishing Commissioning Installing Bottom PanelFinishing Commissioning Replace Outer CasingInspection and Service Inspection and ServiceInspection Removing outer case Component AccessAdjusting boiler control to Service position Primary Heat ExchangerTo maximum Setting Boiler to MaximumBoiler will stay in this mode for AgainTo Clean the Heat Exchanger Inspection and Service Small Tab Primary sensor Replacement of PartsReplacement of Parts Overheat thermostatGas valve Moving boiler control to service positionGas adjuster SiphonPCB fuse Access to boiler control componentsTransformer / PCB 12.3 12.112.2 Replacing control14.4 13.2 13.314.2 15.3 15.1 15.218.4 18.1 18.2 18.3 21.1 21.2 19.120.1 22.1 22.225.1 23.1 23.224.1 26.1 26.2Hydraulic Block 28.1 28.227.1 27.230.1 29.129.2 Plastic protection device32.1 32.2 31.131.2 32.333.3 33.4Short Parts List 1112 1415 1718 2021 2324Code plug G. ConversionCode plugs G. ConversionFault Finding Fault FindingCentral Heating Function Ignition SequenceCentral Heating Function Preheat and DHW Function Preheat and DHW FunctionProtection Function Protection FunctionGAS Boiler Commissioning Checklist Service Interval Record Excellence Comes AS Standard Bonded Washer 3/4
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28i junior, 24i junior specifications

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