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COMBI 428
Baxi COMBI 428 Installation And Service Manual
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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
224 — 228 — 424 — 428
2
Table of Contents
Default Chapter
3
Table of Contents
3
1 Safety
6
Benchmark
6
Building Regulations and the Benchmark Commissioning Checklist
6
The Benchmark Scheme
6
Installer Notification Guidelines
7
General Safety Instructions
8
Recommendations
9
Specific Safety Instructions
9
Handling
9
Liabilities
10
Manufacturer's Liability
10
Installer's Liability
10
User's Liability
10
2 About this Manual
12
General
12
Additional Documentation
12
Symbols Used
12
Symbols Used in the Manual
12
Abbreviations/Glossary
12
3 Technical Specifications
13
Homologations
13
Directives
13
Certifications
13
Gas Category
13
Standards
13
Technical Data
14
Technical Information
14
Technical Parameters
17
Dimensions and Connections/Clearances
18
Electrical Diagram
20
4 Description of the Product
22
General Description
22
Operating Principle
22
Air-Gas Adjustment
22
Combustion
22
Heating and Domestic Hot Water Production
23
Main Components
23
Control Panel Description
23
Description of the Keys
23
Description of the Display
23
Standard Delivery
24
Contents of the Carton
24
Accessories and Options
24
Optional Accessories
24
5 Before Installation
25
Installation Regulations
25
Installation Requirements
25
Gas Supply
25
Electrical Supply
25
Hard Water Area
25
Bypass
25
System Control
26
Treatment of Water Circulating Systems
26
Showers
26
Expansion Vessel (CH Only)
26
Pump Available Head
27
Safety Pressure Relief Valve
27
Choice of the Location
27
Location of the Boiler
27
Data Plate and Service Label
28
Bath and Shower Rooms
29
Ventilation
29
Condensate Drain
29
Clearances
32
Flue/Chimney Location
32
Horizontal Flue/Chimney Systems
34
Flue/Chimney Trim
34
Terminal Guard
35
Flue/Chimney Deflector
35
Flue/Chimney Accessories
35
Transport
35
Unpacking & Initial Preparation
35
Unpacking
35
Initial Preparation
37
Connecting Diagrams
37
Filling Information
37
Domestic Hot Water Circuit
38
6 Installation
40
General
40
Assembly
40
Fitting the Pressure Relief Discharge Pipe
40
Connecting the Condensate Drain
40
Preparation
41
Air Supply/Flue Gas Connections
41
Connecting the Flue/Chimney
41
Electrical Connections
42
Panel Removal to Make Electrical Connection
42
Electrical Connections of the Boiler
43
Connecting a Room Thermostat
43
Filling the Installation
43
Flushing the System
43
Filling the Installation
44
7 Commissioning
45
General
45
Checklist before Commissioning
45
Preliminary Electrical Checks
45
Checks
45
Commissioning Procedure
46
De-Aeration Function
46
Gas Settings
46
Check the Operational (Working Gas Inlet Pressure and Gas Rate)
46
Checking Combustion - Chimney Sweep Mode
47
Configuring the System
50
System Draining
50
Final Instructions
50
Handover
50
8 Operation
51
Use of the Control Panel
51
Control
51
Start up
51
Shutdown
51
Frost Protection
51
9 Settings
52
Functions
52
Information Menu
52
10 Maintenance
53
General
53
Periodic Check and Maintenance Procedure
54
Checking the Water Pressure
54
Checking the Expansion Vessel
54
Checking the Automatic Air Vent
54
Checking the Burner and Cleaning the Heat Exchanger
54
Specific Maintenance Instructions
55
Detection/Spark Ignition Electrode
55
NTC Flue Sensor
56
Flow and Return Sensors
56
Safety Overheat Thermostat
56
HMI Control
56
Burner/Combustion Chamber Door Assembly
57
Air/Gas Unit
57
Insulation
58
Heat Exchanger
59
Hydraulics Maintenance
60
Expansion Vessel
60
Pump - Complete
60
Auto Air Vent
61
Plate Heat Exchanger
61
Hydraulic Pressure Sensor
62
DHW Flow Sensor (Hall Effect Sensor)
62
DHW Flow Regulator and Filter
62
Diverter Valve Motor
63
Diverter Valve Cartridge
63
Pressure Relief Valve
63
11 Troubleshooting
64
Error Codes
64
Fault Finding - Temporary Faults
64
Fault Finding - Permanent Faults
65
Accessing the Information Menu
69
Reading out Operating Parameters
69
Statuses and Sub-Statuses
69
12 Decommissioning
71
Decommissioning Procedure
71
13 Spare Parts
72
Short Parts List
72
14 Appendix
73
Combustion Check on Small Heating Systems
73
Benchmark Commissioning Checklist
74
Service Records
75
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User Guide
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Baxi COMBI 428 Specifications
General
Output Power
28 kW
Fuel Type
Natural Gas
Type
Combination Boiler
Dimensions (H x W x D)
700 x 400 x 285 mm
Water pressure
1 bar
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