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Table Of Contents - Worcester 28Si Installation And Servicing Instructions

Wall mounted combination boilers for central heating and mains fed domestic hot water

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Installation and servicing instructions (40 pages)

Table Of Contents

Table of Contents

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Table of Contents

Servicing Instructions1

Installation Regulations2

Electrical And Gas Supply2

Table Of Contents2

Showers, Bidets, Taps And Mixing Valves3

Technical Data4

Siting The Appliance6

Appliance Casing Dimensions And Required Clearances6

Side Flue Opening6

Pipework Connections6

Flue Terminal Positions7

The Minimum Free Areas Required Are:7

Siting Of The Flue Terminal.7

Sealed Primary Water System.8

System Make Up8

Open Vent System8

Domestic Hot Water9

Wiring Diagram10

Functional Flow Diagram11

Installing The Appliance12

Site Preparation12

Fixing Holes And Flue Opening12

Install The Boiler13

Air And Flue Duct Preparation13

Manifold Assembly13

Relief Valve Drain Connection13

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 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

Commissioning The Appliance18

Remove The Appliance Cabinet18

Set The Expansion Vessel Pressure18

Set The System Pressure18

Checking The Burner Pressure19

Central Heating19

Balance The System19

Set The Room Thermostat19

Inspection And Servicing20

Component Access20

Component Cleaning20

Inner Case Components21

Replacement Of Parts22

Draining The Appliance22

Component Replacement22

Spark Electrode23

Flame Sense Electrode23

Combustion Chamber Insulation23

Pressure Gauge24

Combustion Chamber Insulation.24

Pressure Gauge Head24

Inlet Water Filter25

Control Board25

Control Board Cover25

Clock/Programmer26

Air Flow Detector26

Expansion Vessel27

Auto Air Vent27

Primary Heat Exchanger27

Short Parts List28

Operational Flow Diagram30

Central Heating Function30

Domestic Hot Water Function30

Overrun Function31

Autofrostat Function31

Fault Finding32

Light Situation During Fault32

To Fit The Timeswitch41

To Set The Timeswitch41

Installation Instructions42

Flue Terminal Position43

Vertical Balanced Flue Options43

Terminal Height43

Terminal Assembly44

Nominal Flue Height44

Flue With Offset Using Two Flue Bends44

Flue Restriction Rings44

Preparation And General Notes45

Flue Height And Offsets45

Installation Of Boiler45

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

Installation Of Flue50

Position Of The Fire Stop Spacer Assembly50

Position Of The Flue Duct Support Bracket50

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

To Fit The Programmer55

Power Up Condition55

Battery Back-Up55

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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25si