1 INTRODUCTION 4
1.1 How a condensing boiler operates 4
1.2 Boiler description 4
1.3 Flue options 4
1.4 Boiler components 5
2 TECHNICAL DATA 6
2.1 Boiler technical data 6
2.2 Burner settings 7
2.3 Flue gas analysis 7
2.4 Boiler dimensions 7
3 OIL STORAGE AND SUPPLY SYSTEM 8
3.1 Fuel supply 8
3.2 Burner oil connection 10
4 INSTALLATION 12
4.1 Introduction 12
4.2 Boiler location 12
4.3 Regulations compliance 12
4.4 Heating system design
considerations 12
4.5 Pipework materials 13
4.6 Connections 13
4.7 Preparation for installation 13
4.8 Installing the boiler 14
4.9 Expansion vessel 14
4.10 Filling the heating system 14
4.11 Before you commission 14
4.12 Completion 14
5 PIPE CONNECTIONS 15
5.1 Water connections 15
5.2 Making the water connections 16
5.3 Domestic hot water system 16
5.4 To use the water hardness kit 16
6 CONDENSATE DISPOSAL 17
6.1 General requirements 17
6.2 Connections 17
6.3 Pipework 17
6.4 External pipework 17
6.5 Condensate soakaway 18
6.6 Condensate trap 18
6.7 Condensate disposal pipework 19
6.8 Inspection and cleaning of trap 19
7 SEALED SYSTEMS 20
7.1 Sealed system requirements 20
7.2 Filling the sealed system 21
7.3 Venting the pump 21
7.3 Pressure relief (safety) valve
operation 21
8 ELECTRICAL 22
8.1 General 22
8.2 Connecting the power supply 22
8.3 Connecting the controls -
Heating only 24
8.4 Connecting the ocntrols -
Heating and Hot Water 25
8.5 Connecting a remote frost thermostat 26
9 FLUE SYSTEM AND AIR SUPPLY 27
9.1 Air supply 27
9.2 Plume diverter kit 27
Contents Page 3
9.3 Conventional ue systems 28
9.4 External vertical conventional ue
(Green System) 28
9.5 External horizontal conventional ue
(Green System) 30
9.6 Flue clearances 31
10 COMMISSIONING 33
10.1 Before switching on 34
10.2 Burner settings:
RDB 2.2 BX burners 34
10.3 Air adjuster disc:
Combi 21 only 36
10.4 Switching on 36
10.5 Running the boiler 37
10.6 Balancing the system 37
10.7 Completion 37
10.8 Information for the user 37
11 SERVICING 38
11.1 Checks before servicing 38
11.2 Dismantling prior to servicing 38
11.3 Cleaning the boiler 38
11.4 Cleaning the burner:
RDB 2.2 BX burners 40
11.5 Adjusting the diuser 41
11.6 Air adjuster disc:
Combi 21 only 41
11.7 Recommissioning 41
11.8 Burner components 42
12 FAULT FINDING 43
12.1 Initial checklist-
For installers or service engineers 43
12.2 Main fault nding procedures 44
12.3 Poor hot water checklist 46
12.4 Burner fault nding -
Riello RDB burners 47
13 SPARE PARTS 48
13.1 Boiler parts list 48
13.2 Sealed system parts list 48
13.3 Riello RDB 2.2 BX burners 49
14 DECLARATION OF CONFORMITY 52
15 HEALTH AND SAFETY INFORMATION 53
15.1 Insulation materials 53
15.2 Sealant and adhesive 53
15.3 Kerosene and Gas Oil fuels 53
16 END OF LIFE INFORMATION 54
17 PRODUCT FICHE 55
18 GUARANTEE 56
A1 WILO YONOS PARA RS RKC
CIRCULATING PUMP 58
A2 WILO-PARA 25-130/7-50/SC-6#GRA
CIRCULATING PUMP 60
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