Worcester 28Si User Manual

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10

Fig. 11. Wiring diagram.

Fan

Flame sense

electrode

Air

pressure switch

Spark

electrode

Spark

transformer

Mains in

Link

Control Board

CH sensor

(front of heat

exchanger)

Flow

switch

ST16

2 blue

2 orange

2 brown

brown

blue

blue

brown

2 violet

white

2 red

2 yellow

2

pink

ST12

ST8

ST15

ST1

Pump

Gas valve

Reg

Main

Main

2 green

brown

yellow

Overheat cut-off

device

DHW sensor

Table of Contents

Servicing Instructions1
Table of Contents2
Electrical and Gas Supply2
Installation Regulations2
Introduction2
- Controls3
- System3
- Showers, Bidets, Taps and Mixing Valves3
- Safety3
Technical Data4
- Appliance Casing Dimensions and Required Clearances6
- Side Flue Opening6
- Pipework Connections6
Siting the Appliance6
- The Minimum Free Areas Required Are:7
- Siting of the Flue Terminal.7
Flue Terminal Positions7
Air Supply7
- Sealed Primary Water System.8
- System Fill8
- System Make up8
Sealed System8
Open Vent System8
Domestic Hot Water9
Gas Supply9
Electrical9
- Wiring Diagram10
- Functional Flow Diagram11
- Installing the Appliance12
- Unpacking12
- Site Preparation12
- Fixing Holes and Flue Opening12
Installation12
- Relief Valve Drain Connection13
- Manifold Assembly13
- Air and Flue Duct Preparation13
- Install the Boiler13
- Measure and Cut the Ducts.14
- Standard Flue Assembly14
- Extension Duct14
- Flue Duct Length - Side14
- Fitting the Flue Assembly With/Without Access to the Terminal15
- Flue Bends15
- Flue Duct Length - Rear15
- Flue Turret Fixing15
- Vertical Adapter for Horizontal Flues16
- Completion of the Installation16
- Elbow to Flue Turret Assembly16
- Facia Connections Cover17
- Programmer Cover17
- Programmer Connection17
- Mains Voltage External Controls Connections17
- Set the System Pressure18
- Commissioning the Appliance18
- Set the Expansion Vessel Pressure18
- Remove the Appliance Cabinet18
- Checking the Burner Pressure19
- Central Heating19
- Balance the System19
- Set the Room Thermostat19
- Component Access20
- Component Cleaning20
Handover20
Inspection and Servicing20
- Inner Case Components21
- Draining the Appliance22
- Component Replacement22
- Gas Valve22
Replacement of Parts22
- Combustion Chamber Insulation23
- Flame Sense Electrode23
- Spark Electrode23
- Burner23
- Pressure Gauge24
- Relief Valve24
- Combustion Chamber Insulation.24
- Pressure Gauge Head24
- Flow Switch25
- Inlet Water Filter25
- Control Board25
- Control Board Cover25
- Transformer26
- Clock/Programmer26
- Fan26
- Air Flow Detector26
- Auto Air Vent27
- Primary Heat Exchanger27
- Expansion Vessel27
- Pump27
Short Parts List28
- Central Heating Function30
- Domestic Hot Water Function30
Operational Flow Diagram30
- Overrun Function31
- Autofrostat Function31
- Light Situation During Fault32
Fault Finding32
- To Fit the Timeswitch41
- To Set the Timeswitch41
- Flue System42
- Installation Instructions42
- Flue Terminal Position43
- Vertical Balanced Flue Options43
- Terminal Height43
- Flue Restriction Rings44
- Nominal Flue Height44
- Terminal Assembly44
- Flue with Offset Using Two Flue Bends44
- Preparation and General Notes45
- Flue Height and Offsets45
- Installation of Boiler45
- Flue Adaptor45
- Positioning the Flue System46
- Marking out the Flue Assembly Position46
- Measurement of Ducts47
- Air and Flue Duct Length47
- Vertical Flue System47
- Air and Flue Duct Lengths48
- Vertical Flue System Offset with Vertical Adaptor48
- Vertical Flue System Offset Without Vertical Adaptor49
- Position of the Fire Stop Spacer Assembly50
- Position of the Flue Duct Support Bracket50
- Cut Ducts50
- Installation of Flue50
- Duct Assembly51
- Fitting Flue and Air Ducts Onto an Elbow at the Appliance51
- Prepare the Roof51
- Fix the Flue System Assembly to the Appliance51
- Fix the Flue Terminal Assembly52
- Seal the Terminal Assembly to the Roof52
- Battery Back-Up55
- To Fit the Programmer55
- Power up Condition55
- Programmer55
- To Replace the Programmer56
- Programmer Operating Instructions58
- To Set the Clock58
- To Set the Programme58
- To Test the Programme59
- Operational Notes59

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Worcester 28Si Specifications

General

Model	28Si
Output	28kW
Efficiency Rating	A
ErP Rating	A
Flow Rate	11.4 l/min
Water Pressure	3 bar
Max Gas Rate	2.8 m3/h

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