Contents

Contents
1 Safety
- 1.1 Benchmark
  - 1.1.1 Building Regulations and the Benchmark Commissioning Checklist
  - 1.1.2 The Benchmark Scheme
  - 1.1.3 Installer Notification Guidelines
- 1.2 General safety instructions
- 1.3 Recommendations
- 1.4 Specific safety instructions
  - 1.4.1 Handling
- 1.5 Liabilities
  - 1.5.1 Manufacturer's liability
  - 1.5.2 Installer's liability
  - 1.5.3 User's liability
2 About this manual
- 2.1 General
- 2.2 Additional documentation
- 2.3 Symbols used
  - 2.3.1 Symbols used in the manual
- 2.4 Abbreviations/Glossary
3 Technical specifications
- 3.1 Homologations
  - 3.1.1 Directives
  - 3.1.2 Certifications
  - 3.1.3 Gas category
  - 3.1.4 Standards
- 3.2 Technical data
  - 3.2.1 Technical information
  - 3.2.2 Technical parameters
- 3.3 Dimensions and connections/clearances
- 3.4 Electrical diagram
4 Description of the product
- 4.1 General description
- 4.2 Operating principle
  - 4.2.1 Air-gas adjustment
  - 4.2.2 Combustion
  - 4.2.3 Central heating and domestic hot water production
  - 4.2.4 Central heating mode
  - 4.2.5 Domestic hot water mode
  - 4.2.6 Frost protection mode
  - 4.2.7 Pump protection
- 4.3 Main components
  - 4.3.1 List of components
- 4.4 Control panel description
  - 4.4.1 Description of the control panel
- 4.5 Standard delivery
  - 4.5.1 Contents of the carton
- 4.6 Accessories and options
  - 4.6.1 Optional accessories
5 Before installation
- 5.1 Installation regulations
- 5.2 Installation requirements
  - 5.2.1 Gas supply
  - 5.2.2 Electrical supply
  - 5.2.3 Hard water area
  - 5.2.4 Bypass
  - 5.2.5 System control
  - 5.2.6 Treatment of water circulating systems
  - 5.2.7 Showers
  - 5.2.8 Expansion vessel (CH only)
  - 5.2.9 Safety pressure relief valve
- 5.3 Choice of the location
  - 5.3.1 Location of the boiler
  - 5.3.2 Bath and shower rooms
  - 5.3.3 Ventilation
  - 5.3.4 Condensate drain
  - 5.3.5 Clearances
  - 5.3.6 Flue/chimney location
  - 5.3.7 Horizontal flue/chimney systems
  - 5.3.8 Flue/chimney trim
  - 5.3.9 Terminal guard
  - 5.3.10 Flue/chimney deflector
  - 5.3.11 Flue/chimney accessories
- 5.4 Transport
- 5.5 Unpacking & initial preparation
  - 5.5.1 Unpacking
  - 5.5.2 Initial preparation
- 5.6 Connecting diagrams
  - 5.6.1 Filling information
  - 5.6.2 Domestic hot water circuit
6 Installation
- 6.1 General
- 6.2 Assembly
  - 6.2.1 Fitting the pressure relief discharge pipe
  - 6.2.2 Connecting the condensate drain
- 6.3 Air supply/flue gas connections
  - 6.3.1 Connecting the flue/chimney
- 6.4 Electrical connections
  - 6.4.1 Making the electrical connection
  - 6.4.2 Connecting outdoor sensor
  - 6.4.3 Identifying label
  - 6.4.4 Outdoor sensor graph
  - 6.4.5 Setting outdoor sensor curve
- 6.5 Filling the installation
  - 6.5.1 Flushing the system
  - 6.5.2 Fill the installation
  - 6.5.3 Filling the condensate trap
7 Commissioning
- 7.1 General
- 7.2 Checklist before commissioning
  - 7.2.1 Preliminary electrical checks
  - 7.2.2 Checks
- 7.3 Commissioning procedure
  - 7.3.1 De-Aeration function
- 7.4 Gas settings
  - 7.4.1 Check the operational (working gas inlet pressure and gas rate)
  - 7.4.2 Checking combustion - chimney sweep mode
- 7.5 Configuring the system
  - 7.5.1 System draining
- 7.6 Final instructions
  - 7.6.1 Handover
8 Operation
- 8.1 Use of the control panel
  - 8.1.1 Control panel
- 8.2 Start up
- 8.3 Frost protection
9 Maintenance
- 9.1 General
- 9.2 Standard inspection and maintenance operations
  - 9.2.1 Annual Servicing
  - 9.2.2 Checking the water pressure
  - 9.2.3 Checking the expansion vessel
  - 9.2.4 Checking the automatic air vent
  - 9.2.5 Checking the burner and cleaning the heat exchanger
- 9.3 Specific maintenance instructions
  - 9.3.1 Detection/spark ignition electrode
  - 9.3.2 NTC flue sensor
  - 9.3.3 Flow and return sensors
  - 9.3.4 Safety overheat thermostat
  - 9.3.5 DHW temperature sensor (NTC)
  - 9.3.6 Pressure Gauge
  - 9.3.7 Hall effect sensor
  - 9.3.8 DHW flow regulator and filter
  - 9.3.9 Safety pressure relief valve
  - 9.3.10 Diverter valve motor
  - 9.3.11 Expansion vessel
  - 9.3.12 Gas valve
  - 9.3.13 Pump - head only
  - 9.3.14 Pump - complete
10 Troubleshooting
- 10.1 Error codes
  - 10.1.1 Initial error fault finding checks
  - 10.1.2 Display of error codes
- 10.2 Fault finding
  - 10.2.1 Central heating
  - 10.2.2 Domestic hot water
  - 10.2.3 Fault finding solutions sections A to E
  - 10.2.4 Fault finding solutions sections F to H
  - 10.2.5 Fault finding solutions sections I to M
11 Decommissioning
- 11.1 Decommissioning procedure
12 Disposal
- 12.1 Disposal and recycling
13 Spare parts
- 13.1 Short parts list
14 Appendix
- 14.1 Benchmark commissioning checklist
- 14.2 Service records

Baxi 624 Combi LPG Installation and Service Manual

Pages 80

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Baxi 624 Combi LPG Specification

The Baxi 624 Combi LPG boiler is a compact and efficient solution designed for residential heating and hot water needs, operating on liquefied petroleum gas. It features a 24 kW output, making it suitable for small to medium-sized homes. The boiler's compact dimensions, with a height of 700 mm, a width of 390 mm, and a depth of 285 mm, allow for easy installation in various spaces, including kitchen cupboards. It boasts a high-efficiency rating of 93%, ensuring optimal energy use and reduced utility bills.

The Baxi 624 Combi LPG incorporates advanced technology, including a stainless steel heat exchanger for durability and efficiency. It offers a flow rate of 10.2 liters per minute, providing ample hot water supply on demand. The unit is compatible with various smart controls, enhancing user convenience through remote operation and improved energy management.

Safety features include an automatic system bypass and an integrated frost protection mechanism, ensuring reliable operation even in colder conditions. The boiler is also ErP A-rated for both heating and hot water, highlighting its environmentally friendly design. This model operates quietly, reducing noise disturbance within the home.

Installation and servicing are streamlined by its front-access components and a pre-plumbing jig, facilitating ease of maintenance. The Baxi 624 Combi LPG is supported by a standard five-year warranty, offering peace of mind and assurance of quality. Its LPG compatibility makes it an ideal choice for homes not connected to the mains gas supply, delivering consistent performance and reliability across diverse settings.

Baxi 624 Combi LPG F.A.Q.

How do I reset the Baxi 624 Combi LPG boiler?

To reset the Baxi 624 Combi LPG boiler, locate the reset button on the front panel. Press and hold the button for a few seconds until the boiler restarts.

What should I do if my Baxi 624 Combi boiler is not igniting?

If the boiler is not igniting, check the gas supply and ensure that the boiler is switched on. If the problem persists, inspect the pressure gauge and reset the boiler. If these steps do not work, contact a qualified technician.

How often should I service my Baxi 624 Combi LPG boiler?

It is recommended to have your Baxi 624 Combi LPG boiler serviced annually by a qualified engineer to ensure optimal performance and safety.

What does the error code E133 mean on my Baxi 624 Combi LPG?

The error code E133 indicates a problem with the gas supply or ignition. Ensure that the gas supply is on and reset the boiler. If the issue persists, contact a qualified technician.

How can I increase the water pressure in my Baxi 624 Combi LPG boiler?

To increase the water pressure, locate the filling loop underneath the boiler. Open the valves on the filling loop to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar. Close the valves once the desired pressure is reached.

What maintenance tasks can I perform on my Baxi 624 Combi LPG boiler?

Regularly check the pressure gauge, ensure that the vents are not blocked, and visually inspect for any leaks or unusual noises. Always have a qualified engineer perform annual maintenance.

Why is my Baxi 624 Combi boiler making a loud banging noise?

A loud banging noise, often referred to as "kettling," can be caused by limescale build-up or trapped air in the system. Bleed the radiators and if the problem persists, contact a heating engineer.

Can I use my Baxi 624 Combi LPG boiler during a power outage?

No, the Baxi 624 Combi LPG boiler requires electricity to operate. It will not function during a power outage. Consider installing an alternative power source if necessary.

How do I bleed a radiator connected to my Baxi 624 Combi LPG boiler?

Turn off the heating system. Use a radiator key to open the bleed valve slightly until water starts to escape, then close it. Ensure the system pressure is adequate after bleeding.

What does it mean if my Baxi 624 Combi boiler is leaking water?

Water leakage can indicate a problem with the pressure relief valve, joints, or internal components. Turn off the boiler and contact a qualified technician to diagnose and repair the issue.