baxi 624 Combi User guide
These instructions include the Benchmark Commissioning Checklist and should be left with the
user for safe keeping.They must be read in conjunction with the Flue Installation Guide.
United Kingdom
en
Installation and Service Manual
High Efficiency Wall Hung Condensing Gas Boiler
Baxi Combi
624 — 630
Dear Customer,
Thank you very much for buying this appliance.
Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to
ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer
service organisation can assist with this.
We hope you enjoy years of problem-free operation with the product.
Contents
7679306 - 1 - 10082017 3
Contents
1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Benchmark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1.1 Building Regulations and the Benchmark Commissioning Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.1.2 The Benchmark Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1.3 Installer Notification Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Specific safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.4.1 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
1.5 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5.1 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5.2 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5.3 User's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Additional documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Abbreviations/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.1 Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.1.2 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.3 Gas category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.4 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.1 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.2 Technical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3 Dimensions and connections/clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.4 Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2.1 Air-gas adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2.2 Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2.3 Central heating and domestic hot water production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.4 Central heating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.5 Domestic hot water mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.6 Frost protection mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2.7 Pump protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.3 Main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.1 List of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.4 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4.1 Description of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5 Standard delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5.1 Contents of the carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.6 Accessories and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.6.1 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5 Before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Installation regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.2.1 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.2.2 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.2.3 Hard water area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5.2.4 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5.2.5 System control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5.2.6 Treatment of water circulating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2.7 Showers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.2.8 Expansion vessel (CH only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.2.9 Safety pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Contents
4 7679306 - 1 - 10082017
5.3 Choice of the location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3.1 Location of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3.2 Bath and shower rooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.3.3 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3.4 Condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3.5 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
5.3.6 Flue/chimney location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3.7 Horizontal flue/chimney systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.8 Flue/chimney trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.3.9 Terminal guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5.3.10 Flue/chimney deflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5.3.11 Flue/chimney accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.4 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5.5 Unpacking & initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.5.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.5.2 Initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.6 Connecting diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.6.1 Filling information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
5.6.2 Domestic hot water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6.2.1 Fitting the pressure relief discharge pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6.2.2 Connecting the condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3 Air supply/flue gas connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3.1 Connecting the flue/chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.4 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.1 Making the electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.2 Connecting outdoor sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.4.3 Identifying label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.4.4 Outdoor sensor graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.4.5 Setting outdoor sensor curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
6.5 Filling the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
6.5.1 Flushing the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
6.5.2 Fill the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.5.3 Filling the condensate trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2 Checklist before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.1 Preliminary electrical checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.2 Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
7.3 Commissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.3.1 De-Aeration function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.4 Gas settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.4.1 Check the operational (working gas inlet pressure and gas rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.4.2 Checking combustion - chimney sweep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.5 Configuring the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.5.1 System draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
7.6 Final instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.6.1 Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
8.1 Use of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.1.1 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.2 Start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.3 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.2 Standard inspection and maintenance operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2.1 Annual Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2.2 Checking the water pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.2.3 Checking the expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.4 Checking the automatic air vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Contents
7679306 - 1 - 10082017 5
9.2.5 Checking the burner and cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.3 Specific maintenance instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
9.3.1 Detection/spark ignition electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.3.2 NTC flue sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
9.3.3 Flow and return sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.3.4 Safety overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.3.5 DHW temperature sensor (NTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.3.6 Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
9.3.7 Hall effect sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
9.3.8 DHW flow regulator and filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
9.3.9 Safety pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.3.10 Diverter valve motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.3.11 Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.3.12 Gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.3.13 Pump - head only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
9.3.14 Pump - complete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
10.1 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.1.1 Initial error fault finding checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.1.2 Display of error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.2 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
10.2.1 Central heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
10.2.2 Domestic hot water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.3 Fault finding solutions sections A to E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.2.4 Fault finding solutions sections F to H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10.2.5 Fault finding solutions sections I to M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
11 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
11.1 Decommissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
12 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
12.1 Disposal and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
13 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
13.1 Short parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
14 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
14.1 Benchmark commissioning checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
14.2 Service records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
AD-3000725-01
1 Safety
6 7679306 - 1 - 10082017
1 Safety
1.1 Benchmark
1.1.1 Building Regulations and the Benchmark Commissioning Checklist
Building Regulations (England & Wales) require notification of the installa
tion of a heating appliance to the relevant Local Authority Building Control
Department. This can be achieved via a Competent Persons Self Certifica
tion Scheme as an option to notifying the Local Authority directly.
The Health & Safety Executive operates the ’Gas Safe Register’, a selfcer
tification scheme for gas heating appliances.
This company is a member of the Benchmark initiative and fully supports
the aims of the programme. Its aim is to improve the standards of installa
tion and commissioning of central heating systems in the UK and to en
courage the regular servicing of all central heating systems to ensure safe
ty and efficiency.
Building Regulations require that installations should comply with manu
facturer’s instructions. It is therefore important that the commissioning
checklist is completed by the installer. The relevant section of Building
Regulations only relates to dwellings. Therefore the checklist only applies
if the appliance is being installed in a dwelling or some related structure.
The flowchart opposite gives guidance for installers on the process neces
sary to ensure compliance with Building Regulations.
Fig.1
Benchmark
1.1.2 The Benchmark Scheme
Benchmark places responsibilities on both manufacturers and installers.
The purpose is to ensure that customers are provided with the correct
equipment for their needs, that it is installed, commissioned and serviced
in accordance with the manufacturer’s instructions by competent persons
and that it meets the requirements of the appropriate Building Regulations.
The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations and should be provided to the customer for future ref
erence.
Installers are required to carry out installation, commissioning and servic
ing work in accordance with the Benchmark Code of Practice which is
available from the Heating and Hotwater Industry Council who manage
and promote the Scheme. Visit www.centralheating.co.uk for more infor
mation.
Fig.2 Installer Notification Guidelines
AD-3000696-01
Choose Building
Regulations Notification
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
and will issue a
certificate of compliance
‘Gas Safe Register’ will issue a
Building Regulations Compliance
Certificate to the property owner
and inform the relevant LABC
You must ensure that the
certificate number issued by
the ‘Gas Safe Register’ is written
onto the Benchmark Checklist
Scheme Members only
Call ‘Gas Safe Register’ on:
0800 408 5577
or log onto:
www.gassaferegister.co.uk
within 10 days
If you notify via the ‘Gas Safe
Register’, the register will issue
the Building Regulations
certificate on members’ behalf
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
Competent Person's
Self Certification Scheme
Building Control
Complete the
Benchmark Checklist
Install and Commission this
appliance to manufacturer's
instructions
7679306 - 1 - 10082017 7
1 Safety
1.1.3 Installer Notification Guidelines
1 Safety
8 7679306 - 1 - 10082017
1.2 General safety instructions
Danger
This boiler can be used by children aged 8 years and above and
by persons with reduced physical, sensory or mental capabilities
or lack of experience and knowledge when they have been given
supervision or instruction concerning the safe use of the device
and understand the resulting risks. Children must not be allowed
to play with the appliance. Cleaning and user maintenance must
not be carried out by children without supervision.
Danger
If you smell gas:
1. Do not use a naked flame, do not smoke, do not operate elec
trical contacts or switches (doorbell, light, motor, lift, etc.).
2. Shut off gas supply.
3. Open the windows.
4. Trace possible leaks and seal them immediately.
5. If the gas leak is before the gas meter, contact the supplier
6. Telephone the National Gas Emergency Service on:- 0800
111 999.
Danger
If you smell flue gases:
1. Switch off the boiler.
2. Open the windows.
3. Trace possible leaks and seal them immediately.
1.3
Recommendations
Warning
Do not touch the flue gas pipes. Depending on the boiler settings,
o
the temperature of the flue gas pipes may exceed 60
C.
Warning
Do not touch the radiators for long periods. Depending on the boil
o
er settings, the temperature of the radiators may exceed 60
C.
Warning
Take precautions with the domestic hot water. Depending on the
boiler settings, the domestic hot water temperature may exceed
o
C.
65
Danger
Before any work, switch off the mains supply to the boiler.
Caution
After maintenance or repair work, check the entire heating installa
tion to ensure that there are no leaks.
Warning
Installation and maintenance of the boiler must be carried out by a
qualified installer in accordance with local and national regula
tions.
Warning
If the mains lead is damaged, it must be replaced by the original
manufacturer, the manufacturer's dealer or another suitably skilled
person to prevent hazardous situations from arising.
Warning
Always disconnect the mains supply and close the main gas tap
when working on the boiler.
1 Safety
7679306 - 1 - 10082017 9
Caution
Make sure the boiler can be reached at all times.
The boiler must be installed in a frost-free area.
In the case of a fixed connection to the power cord, you must al
ways install a main double pole switch with an opening gap of at
least 3 mm (EN 60335-1).
Drain the boiler and central heating system if you are not going
to use your home for a long time and there is a chance of frost.
The frost protection does not work if the boiler is out of opera
tion.
The boiler protection only protects the boiler, not the system.
Check the water pressure in the system regularly. If the water
pressure is lower than 0.8 bar, the system must be topped up
(recommended water pressure between 1 and 2 bar).
Important
Keep this document near to the boiler.
Important
Casing panels may only be removed for maintenance and servic
ing purposes. Refit all panels when maintenance work and servic
ing are complete.
1.4
Note
Instruction and warning labels must never be removed or covered
and must be clearly legible throughout the entire service life of the
boiler. Replace damaged or illegible instruction and warning labels
immediately.
Note
The boiler must not be modified in any way.
Specific safety instructions
1.4.1 Handling
General
The following advice should be adhered to, from when first handling the
boiler to the final stages of installation, and also during maintenance.
Most injuries as a result of inappropriate handling and lifting are to the
back, but all other parts of the body are vulnerable, particularly should
ers, arms and hands. Health & Safety is the responsibility of EVERY
ONE.
There is no "safe" limit for one man - each person has different capabili
ties. The boiler should be handled and lifted by TWO PEOPLE.
Do not handle or lift unless you feel physically able.
Wear appropriate Personal Protection Equipment e.g. protective gloves,
safety footwear etc.
Preparation
Co-ordinate movements - know where, and when, you are both going.
Minimise the number of times needed to move the boiler - plan ahead.
Always ensure when handling or lifting the route is clear and unobstruc
ted. If possible avoid steps, wet or slippery surfaces, unlit areas etc. and
take special care on ladders/into lofts.
Technique
When handling or lifting always use safe techniques - keep your back
straight, bend your knees. Don’t twist - move your feet, avoid bending
forwards and sideways and keep the load as close to your body as pos
sible.
Where possible transport the boiler using a sack truck or other suitable
trolley.
1 Safety
10 7679306 - 1 - 10082017
Always grip the boiler firmly, and before lifting feel where the weight is
concentrated to establish the centre of gravity, repositioning yourself as
necessary. See the "Installation" section of these instructions for recom
mended lift points.
Remember
The circumstances of each installation are different. Always assess the
risks associated with handling and lifting according to the individual con
ditions.
If at any time when installing the boiler you feel that you may have in
jured yourself STOP !! DO NOT "work through" the pain - you may
cause further injury.
IF IN ANY DOUBT DO NO HANDLE OR LIFT THE BOILER — OBTAIN
ADVICE OR ASSISTANCE BEFORE PROCEEDING !
1.5
Liabilities
1.5.1 Manufacturer's liability
Our products are manufactured in compliance with the requirements of the
various Directives applicable. They are therefore delivered with the
marking and any documents necessary. In the interests of the quality of
our products, we strive constantly to improve them. We therefore reserve
the right to modify the specifications given in this document.
Our liability as manufacturer may not be invoked in the following cases:
Failure to abide by the instructions on installing the appliance.
Failure to abide by the instructions on using the appliance.
Faulty or insufficient maintenance of the appliance.
1.5.2 Installer's liability
The installer is responsible for the installation and initial commissioning of
the appliance. The installer must observe the following instructions:
Read and follow the instructions given in the manuals provided with the
appliance.
Install the appliance in compliance with prevailing legislation and stand
ards.
Carry out initial commissioning and any checks necessary.
Explain the installation to the user.
If maintenance is necessary, warn the user of the obligation to check the
appliance and keep it in good working order.
Give all the instruction manuals to the user.
1.5.3 User's liability
To guarantee optimum operation of the system, you must abide by the fol
lowing instructions:
Read and follow the instructions given in the manuals provided with the
appliance.
Call on a qualified professional to carry out installation and initial com
missioning.
Get your installer to explain your installation to you.
Have the required inspections and maintenance carried out by a quali
fied installer.
Keep the instruction manuals in good condition close to the appliance.
2 About this manual
7679306 - 1 - 10082017 11
2.1 General
2 About this manual
This manual is intended for the installer of a Baxi Combi boiler.
2.2
2.3
Additional documentation
Symbols used
Various timers, external controls, etc. are available as optional extras. Full
details are contained in the relevant sales literature.
2.3.1
This manual uses various danger levels to draw attention to special in
structions. We do this to improve user safety, to prevent problems and to
guarantee correct operation of the appliance.
Symbols used in the manual
Danger
Risk of dangerous situations that may result in serious personal
injury.
Danger of electric shock
Risk of electric shock.
Warning
Risk of dangerous situations that may result in minor personal in
jury.
Caution
Risk of material damage.
2.4 Abbreviations/Glossary
Important
Please note: important information.
See
Reference to other manuals or pages in this manual.
BS British Standard
CH Central heating
DHW Domestic hot water
GB Great Britain
HHIC Heating and Hotwater Industry Council
Hi Lower heating value (LHV)
Hs Higher heating value (HHV)
IE Ireland
PCU PCB for managing burner operation
Pn Nominal output
Pnc Condensing output
SU Safety PCB
3 Technical specifications
12 7679306 - 1 - 10082017
3 Technical specifications
3.1 Homologations
3.1.1 Directives
Our company declares that these products are provided with the CE mark
ing in compliance with the essential requirements of the following direc
tives:
Gas Directive 2009/142/EC;
Electromagnetic Compatibility Directive 2014/30/EU General standards:
EN 61000-6-3, EN 61000-6-1 Standard in reference to: EN 55014;
Electromagnetic Compatibility Directive 2014/30/EU General standards:
EN 61000-6-3, EN 61000-6-1 Standard in reference to: EN 55014.
For appliances connected to the electricity network: Comply with the
prevailing provisions for low-voltage electrical equipment;
Low Voltage Directive 2014/35/EU General standard: EN 60335–1
Standard in reference to: EN 60335–2-102;
Efficiency Directive 92/42/EC
Ecodesign Directive 2009/125/EC;
Directive on energy consumption 2010/30/EC; Regulation (EU) No.
813/2013 and 814/2013.
Energy Labelling Directive 2010/30/EU: Regulation 811/2013 and
812/2013
In addition to the provisions and legal directives, also the complementary
directives described in these instructions must be observed. All the sup
plements and additional requirements are applicable at the moment of in
stallation.
3.1.2 Certifications
Tab.1 Certifications
CE certificate number
NOx class 5
Boiler type C13, C
33
3.1.3 Gas category
Tab.2 Gas category, type and supply pressure
Gas category Gas type Supply pressure (mbar)
I
2H
G20 20
3.1.4 Standards
Codes of Practice — refer to the most recent version
Tab.3 In GB the following Codes of Practice apply:
Standard Scope
BS 6891 Gas Installation.
BS 5546 Installation of hot water supplies for domestic purposes.
BS EN
12828
Heating systems in buildings.
Standard Scope
7679306 - 1 - 10082017 13
3 Technical specifications
BS EN
12831
BS EN
14336
BS 6798 Installation of gas fired hot water boilers.
BS 5440
Part 1
BS 5440
Part 2
BS 7074 Expansion vessels and ancillary equipment for sealed wa
BS 7593 Treatment of water in domestic hot water central heating
BS 4814 Specification for Expansion Vessels using an internal dia
IGE/UP/
7/1998
Tab.4 In IE the following Code of Practice apply:
Standard Scope
Heating systems in buildings — Calculation of load.
Installation & commissioning of water based heating sys
tems.
Flues.
Ventilation.
ter systems.
systems.
phragm, for sealed hot water systems.
Guide for gas installations in timber framed housing.
3.2
Technical data
IS 813 Domestic Gas Installations.
The following standards give valuable additional information:
BS 5546 Installation of hot water supplies for domestic purposes.
BS EN
12828
BS EN
12831
BS EN
14336
BS 7074 Expansion vessels and ancillary equipment for sealed wa
BS 7593 Treatment of water in domestic hot water central heating
Heating systems in buildings.
Heating systems in buildings — Calculation of load.
Installation & commissioning of water based heating sys
tems.
ter systems.
systems.
3.2.1 Technical information
Important
All data in these sections are nominal and subject to normal pro
duction tolerances.
Tab.5 General
Baxi Combi 624 630
Gas council numbers 47 077 28 47 077 29
Nominal heat input domestic hot water —
Maximum rate
Net (Qn Hi) kW 25.77 30.93
Gross (Qn Hs) kW 28.58 34.26
3 Technical specifications
14 7679306 - 1 - 10082017
Baxi Combi 624 630
Nominal heat input central heating — Maxi
mum rate
Net (Qn Hi) kW 20.6 20.6
Gross (Qn Hs) kW 22.86 22.86
Nominal heat input — Minimum rate Net (Qn Hi) kW 6.2 6.2
Gross (Qn Hs) kW 6.87 6.87
Nominal heat output 80/60°C — domestic hot
Pn kW 25 30
water — Maximum rate
Nominal heat output 80/60°C — central heat
Pn kW 20 20
ing — Maximum rate
Nominal heat output 80/60°C — central heat
Pn kW 20 20
ing — Factory setting
Nominal heat output 80/60°C — Minimum
Pn kW 6.2 6.2
rate
Nominal heat output 50/30°C — central heat
Pnc kW 21.16 21.16
ing — Maximum rate
Nominal heat output 50/30°C — central heat
Pnc kW 6.7 6.7
ing — Minimum rate
Tab.6 Central heating circuit specifications
Baxi Combi 624 630
Maximum pressure bar 3 3
Minimum pressure bar 0.5 0.5
Central heating temperature adjustment (±5°C) °C 25 / 80 25 / 80
Expansion vessel water capacity litres 7.0 7.0
Expansion vessel pre charge pressure bar 1.0 1.0
Maximum capacity of central heating system litres 100 100
Primary water content of boiler (unpressurised) litres 2.5 2.5
Tab.7 Domestic hot water circuit specifications
Baxi Combi 624 630
Maximum pressure bar 8 8
Dynamic minimum pressure bar 0.5 0.5
Minimum working water flow rate
(1)
l/min 2.0 2.0
Specific flow rate (D) l/min 10.2 12.2
Domestic hot water temperature range adjustment
°C 35 / 60 35 / 60
±5°C
Production of domestic hot water with ΔT = 30°C l/min 12 14.3
Production of domestic hot water with ΔT = 35°C l/min 10.2 12.2
(1) Where low flow taps or fittings are intended to be used in the DHW system connected to the boiler, it is strongly recommended that the
DHW flow rate DOES NOT fall below 2.5 l/min. This will ensure reliable operation of the DHW function.
Tab.8 Characteristics of combustion
Baxi Combi 624 630
Natural gas rate (G20) Qmax
Natural gas rate (G20) Qmin
m3/h
m3/h
2.71 3.26
0.67 0.67
3 Technical specifications
7679306 - 1 - 10082017 15
Important
Dynamic (nominal) inlet pressure (Natural gas — G20) 20mbar
with a CV of 37.78 MJ/m
3
Tab.9 Electrical specifications
Baxi Combi 624 630
Nominal electrical power supply voltage V 230 230
Nominal electrical power supply frequency Hz 50 50
Nominal power consumption when firing W 100 100
External fuse rating Amp 3 3
Internal fuse rating Amp F2A H250V F2A H250V
Important
Boiler must be connected to an earth supply.
Tab.10 Other specifications
Baxi Combi 624 630
Degree of protection against humidity (EN 60529) IP IPX5D IPX5D
Dimensions (height / width / depth) mm H 700/W 390/D 285 H 700/W 390/D 285
Tab.11 Connections
Baxi Combi 624 630
Gas inlet mm 22 22
Heating flow mm 22 22
Heating return mm 22 22
Cold water inlet mm 15 15
Hot water outlet mm 15 15
Pressure relief discharge mm 15 15
Condensate discharge drain plastic waste pipe mm 21.5 21.5
Tab.12 Clearances
Baxi Combi 624 630
Above casing mm 178 178
Below casing (min) mm 200 200
Front — for servicing mm 450 450
Front — for operation mm 5 5
Sides LH mm 5 5
Sides RH mm 5 5
Tab.13 Weights
Baxi Combi 624 630
Packaged boiler kg 32.2 32.2
Boiler lift weight (dry) kg 29.2 29.2
Installed weight (dry) kg 30.2 30.2
3 Technical specifications
16 7679306 - 1 - 10082017
Baxi Combi 624 630
Installed weight when filled with water kg 32.5 32.5
3.2.2
Technical parameters
Tab.14 Technical parameters for boiler combination heaters
Baxi Combi 624 630
Condensing boiler Yes Yes
Low-temperature boiler
(1)
No No
B1 boiler No No
Cogeneration space heater No No
Combination heater Yes Yes
Rated heat output
Useful heat output at rated heat output and high tem
perature regime
(2)
Useful heat output at 30% of rated heat output and low
Prated
P
4
P
1
kW 20 20
kW 20 20
kW 6.0 7.5
temperature regime
Seasonal space heating energy efficiency
Useful efficiency at rated heat output and high temper
ƞ
s
ƞ
4
% 93 93
% 97.9 97.9
ature regime
Useful efficiency at 30% of rated heat output and low
ƞ
1
% 108.7 108.7
temperature regime
Auxiliary electricity consumption
Full load
Part load
Standby mode
elmax
elmin
P
SB
kW 68 78
kW 50 53
kW 0.003 0.003
Other items
Standby heat loss
Ignition burner power consumption
Annual energy consumption
Sound power level, indoors
Emissions of nitrogen oxides NO
P
stby
P
ign
Q
HE
L
WA
X
kW 0.069 0.069
kW 0 0
GJ 62 77
dB 51 54
mg/kWh 29.7 28.3
Domestic hot water parameters
Declared load profile XL XL
Daily electricity consumption
Annual electricity consumption
Water heating energy efficiency
Daily fuel consumption
Annual fuel consumption
(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C return temperature
(at heater inlet).
(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet.
Q
elec
AEC
ƞ
wh
Q
fuel
AFC
kWh 0.195 0.196
kWh 43 43
% 83.8 83.9
kWh 23.2 23.1
GJ 18 18
3.3 Dimensions and connections/clearances
PN-0000605
700
285
390
5
5
178
200
450
5
1
2
3
4
5
6
7
8
9
11
10
7679306 - 1 - 10082017 17
Fig.3 Dimensions and connections / clearances
3 Technical specifications
See
The back cover for contact details.
1
Condensate trap sump
2
Condensate drain
3
Heating circuit water flow
4
Hot water outlet
5
Gas inlet
6
Pressure relief pipe
7
Cold water inlet
8
Heating circuit water return
9
Pump drain point
10
Boiler drain point on flow isolation tap
11
Cable entry points
The clearances shown in the diagram are minimum requirements to allow
for case removal, spanner access and air movement. These should be ob
served at all times and kept clear of obstructions.
X23 X37 X36
X22 X20 X24
X10
X11
X12
X13
X1
X2
X3
b
w
r
g g
g
r
r
g
b
g
b g
br
bk
b
b
g
g
r
r
br
b
g/y
bk
r
g/y
g/y
g/y
g/y
br
br
w
X31
br
br
bk
bk
PN-0000341
B
C
D
E
F
G
H
I
J
K
L
N
M
b
br
b
b
O
A
P
1
2
5
6
7
8
9
10
3
4
L
N
E
M1
M2
b
bk
3 Technical specifications
18 7679306 - 1 - 10082017
3.4 Electrical diagram
Fig.4 Electrical wiring diagram
Key Description Key Description
bk — black br — brown b — blue g — green
r — red w — while g/y — green/
A Gas valve I Spark ignition electrode
B Hall effect sensor J Diverter valve motor
C Flue sensor K Pump
D Hydraulic pressure switch L Terminal strip
E Heating return sensor M Fan
yellow
F Heating flow sensor N Safety thermostat
G DHW NTC sensor O Earth point on boiler chassis
H M2 low voltage external control connection P Printed circuit board (PCB)
4 Description of the product
PN-0000606
A
7679306 - 1 - 10082017 19
4.1 General description
4 Description of the product
The Baxi Combi range are fully automatic gas fired wall mounted condens
ing boilers. They are room sealed and fan assisted and will serve central
heating and mains fed domestic hot water.
Tab.15 The boiler is set to give a maximum output of :-
624 models 25 kW DHW
21.16 kW CH Pnc (Condensing)
Fig.5
Information label
630 models 30 kW DHW
21.16 kW CH Pnc (Condensing)
The boiler is factory set for use on Natural Gas (G20).
The boiler is suitable for use only on fully pumped sealed heating systems.
Priority is given to domestic hot water.
An information label giving details of the model, serial number and Gas
Council number is situated on the front middle underside of the outercase
and is accessed by swinging forward gently.
A
Information label
The boiler data badge is positioned on the control box and can be seen
when the outercase panel is removed.
The boiler is intended to be installed in residential / domestic environments
on a governed meter supply only.
The boiler must be installed with one of the purpose designed flues such
as one of the standard horizontal telescopic flue kits detailed in the Flue
Accessories and Fitting Guide.
Important
All systems must be thoroughly cleansed, flushed and treated with
inhibitor.
Note
These installation and servicing instructions must be read in con
junction with the Flue Accessories and Fitting Guide supplied in
the literature pack.
4.2 Operating principle
4.2.1 Air-gas adjustment
The air is drawn in by the fan and gas injected directly at the top of the
mixer valve. The fan rotation speed is regulated automatically by the elec
tronic board based on temperature adjustment and other parameters. The
gas and air are mixed in the manifold. The gas/air ratio ensures that the
quantity of gas and air are adjusted correctly to always obtain optimal
combustion. The gas/air mixture is fed into the burner at the front of the
heat exchanger. The mixture is ignited by the spark electrode.
4.2.2 Combustion
The burner heats the heating water circulating in the heat exchanger.
When the temperature of the combustion gas is lower than the dew point
(around 55 °C), the water vapour contained in the combustion gas con
denses in the flue gas side of the heat exchanger. The heat recovered
during this condensation process (the latent heat or condensing heat) is
also transferred to the heating water. Once cooled, the combustion gases
are discharged through the flue exhaust. The condensed water is dis
charged through a trap.
PN-0000309
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
A
B
C
D
E
F
4 Description of the product
20 7679306 - 1 - 10082017
4.2.3 Central heating and domestic hot water production
In boilers used for heating and for producing domestic hot water, an inte
grated plate heat exchanger heats the domestic water. The heated water
is then channelled to the heating installation or to the plate heat exchanger
via a diverter valve. A flow sensor detects that a hot water tap has been
turned on and communicates this to the printed circuit board (PCB), which
switches the diverter valve to the hot water position and activates the
pump. The diverter valve is spring-loaded but only consumes electricity
when switching from one position to another. Priority is given to domestic
hot water.
4.2.4 Central heating mode
Fig.6
Operating scheme (combi)
With a demand for heating the pump circulates water through the primary
circuit.
Once the main burner ignites the fan speed controls the gas rate to main
tain the heating temperature measured by the temperature sensor.
When the flow temperature exceeds the set temperature, a 3 minute delay
occurs before the burner relights automatically (anti-cycling). The pump
continues to run during this period.
When the demand is satisfied the burner is extinguished and the pump
continues to run for a period of 3 minutes (Pump Overrun).
Key to components
1. Pump with automatic air vent
2. Boiler drain tap
3. Pressure gauge
4. Safety pressure relief valve
5. DHW flow sensor / filter / restrictor
6. DHW priority sensor
7. DHW NTC sensor
8. Hydraulic pressure switch
9. Diverter valve and motor
10. Plate heat exchanger
11. Gas valve
12. Safety thermostat
13. Heating flow sensor
14. Flue sensor
15. Flue adaptor
16. Primary heat exchanger
17. Burner / door assembly
18. Electrode
19. Air / gas collector
20. Heating return sensor
21. Fan
22. Air / gas venturi
23. Expansion vessel
Key to connections
A
Condensate drain
B
Heating flow
C
DHW outlet
D
Gas inlet
E
Cold water inlet on/off valve and filter
F
Heating return
4.2.5 Domestic hot water mode
Priority is given to the domestic hot water supply. A demand at a tap or
shower will override any central heating requirement.
The flow of water will operate the Hall Effect Sensor which requests the
diverter valve to change position. This will allow the pump to circulate the
primary water through the DHW plate heat exchanger.
4 Description of the product
7679306 - 1 - 10082017 21
The burner will light automatically and the temperature of domestic hot wa
ter is controlled by the temperature sensor.
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.
4.2.6 Frost protection mode
Where the boiler is sited in an unheated enclosure and during periods
when the heating system is to be unused it is recommended that the per
manent live is left on to give boiler frost protection.
When the boiler temperature falls below 5° C, the boiler will fire until a
temperature of 30° C is reached.
Important
This will not protect the system !
Further protection can be incorporated by using a system frost thermostat.
4.2.7
If the boiler has been inactive for a period of 24 hours the pump will auto
matically operate for 1 minute to prevent sticking.
Pump protection
4
15
12
13
20
18
19
14
PN-0000388
21
23
PN-0000612
1
2
17
5
3
6
16
7
8
9
11
10
22
4 Description of the product
22 7679306 - 1 - 10082017
4.3 Main components
Fig.7 Component descriptions
4.3.1 List of components
Fig.8 Hydraulic layout
Tab.16 Component descriptions
Key Description Key Description Key Description
1 Expansion vessel 9 Flue sensor 17 Flue adaptor
2 Expansion vessel valve 10 Spark ignition electrode 18 Heating flow sensor
3 Primary heat exchanger 11 Control box 19 Safety thermostat
4 DHW plate heat exchanger (not
5 Pump with automatic air vent 13 Safety pressure relief valve 21 Condensate outlet
on System Models)
6 CH system pressure gauge 14 Gas valve 22 Silencer
7 Fan assembly 15 Diverter valve motor (not on
12 Condensate trap 20 Water Pressure Switch
System Models)
23 Hall effect sensor (not on Sys
tem Models)
8 Burner / door assembly 16 Boiler controls
4.4 Control panel description
R
R
Reset
bar
0
1
2
3
4
1
2
3
4
5 6
PN-0000607
M
i
n
M
a
x
M
a
x
M
i
n
R
PN-0000336
7679306 - 1 - 10082017 23
4 Description of the product
4.4.1 Description of the control panel
Fig.9 Control panel
Fig.10 Display screen
1 Display
2 Reset button
3 Central heating temperature control
4 Service diagnostic port
5 DHW temperature control
6 System water pressure gauge
Display description
The following symbols may be seen on the display
OFF (frost protection still enabled)
Indicates errors that prevent the burner from starting
Error — not resettable by user
Water pressure too low
Indicates a resettable error
Not applicable
Not applicable
Generic error
Burner lit
DHW request
Heating mode
Units for temperature
Units for pressure
4.5 Standard delivery
4.5.1
Contents of the carton
The boiler is delivered in a carton comprising:
Wall hung gas boiler
Wall bracket for fastening the boiler to the wall
Clipping bracket for running pipes upwards
Fitting kit, including taps
Literature pack containing:
Installation and service manual
User guide manual
Template
Flue accessories fitting guide
Warranty documentations
ErP product and package leaflets
System additives leaflets
Important
These installation and service instructions MUST be read in con
junction with the flue accessories fitting guide supplied in the liter
ature pack.
4 Description of the product
24 7679306 - 1 - 10082017
4.6 Accessories and options
4.6.1 Optional accessories
The table shows the accessories available for this boiler range.
Tab.17 Optional accessories
Part number Accessory
7212438 Baxi single channel wired programmable room thermostat
720971601 Baxi room thermostat
720330001 Baxi wired weather sensor
720648301 Multifit condensate & PRV combined pump
720644401 Multifit 1m condensate drain pipe 'trace heating' element
720664101 Multifit 2m Condensate drain pipe 'trace heating' element
720664201 Multifit 3m condensate drain pipe 'trace Heating' element
720664401 Multifit 5m condensate drain pipe 'trace heating' element
5121379 Multifit remote secondary PRV kit
248221 Multifit filling loop
7682790 Multifit rear pipework kit
7682545 Multifit pre-plumbing jig
7209714 Multifit wall mounted 24 hour timeclock
720030501 RF Single Channel Room Thermostat
7212444 Single channel wired timer
For flue accessories (elbows, extensions, clamps etc.) refer to the Flue Ac
cessories Fitting Guide supplied in the literature pack.
Any of the above MUST be fitted ONLY by a qualified competent person.
Further details can be found in the relevant sales literature and at
www.baxi.co.uk
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