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 636 Combi LPG Installation and Manual

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Baxi 636 Combi LPG Specification

The Baxi 636 Combi LPG is a high-efficiency combination boiler designed for domestic use, offering a compact and reliable heating solution. It operates on liquefied petroleum gas (LPG) and is particularly suited for properties without access to natural gas. The boiler boasts a remarkable efficiency of 93%, aligning with ErP A-rating standards, ensuring energy savings and reduced carbon emissions. Designed with convenience in mind, its dimensions are 700mm in height, 390mm in width, and 285mm in depth, allowing it to fit into standard kitchen cupboards, making it an ideal choice for space-conscious installations.

The Baxi 636 Combi LPG delivers a domestic hot water flow rate of 15.3 liters per minute at a 35°C temperature rise, ensuring a steady and reliable supply of hot water for the household's needs. It features an innovative heat exchanger made from brass for enhanced durability and performance. Furthermore, it comes equipped with an in-built frost thermostat, providing protection during colder months and ensuring continuous operation regardless of weather conditions.

Engineered for ease of installation and maintenance, it includes a simple hanging bracket and a pre-plumbing jig. The boiler's user interface is straightforward, with an intuitive control panel and a digital display that simplifies programming and monitoring. Its compatibility with Baxi's uSense smart thermostat allows for enhanced control and energy management through smartphone connectivity. Additionally, the Baxi 636 Combi LPG has a low NOx emission rating, making it environmentally friendly. With a generous warranty period, it offers peace of mind and long-term reliability. Overall, the Baxi 636 Combi LPG is a versatile and efficient solution for modern home heating and hot water needs.

Baxi 636 Combi LPG F.A.Q.

How do I reset the Baxi 636 Combi LPG boiler?

To reset the Baxi 636 Combi LPG boiler, locate the reset button on the control panel. Press and hold it for a few seconds until the boiler restarts. Ensure there are no ongoing faults before resetting.

What is the correct pressure setting for the Baxi 636 Combi LPG boiler?

The ideal pressure for the Baxi 636 Combi LPG boiler should be between 1.0 and 1.5 bar when the system is cold. Check the pressure gauge and adjust accordingly using the filling loop if necessary.

How often should I service my Baxi 636 Combi LPG boiler?

It is recommended to service your Baxi 636 Combi LPG boiler annually to ensure optimal performance, efficiency, and safety. Regular servicing helps to identify potential issues before they become serious.

Why is my Baxi 636 Combi LPG boiler not producing hot water?

If your Baxi 636 Combi LPG boiler is not producing hot water, check if the boiler is showing any error codes. Ensure the thermostat is set correctly and the pressure is within the recommended range. If the issue persists, consult a qualified engineer.

What should I do if my Baxi 636 Combi LPG boiler is leaking water?

If your boiler is leaking water, turn off the water supply and power to the boiler. Contact a qualified heating engineer to inspect and repair the leak as soon as possible to prevent further damage.

How can I improve the efficiency of my Baxi 636 Combi LPG boiler?

To improve the efficiency of your Baxi 636 Combi LPG boiler, ensure it is regularly serviced, bleed radiators to eliminate air pockets, and consider installing a smart thermostat to optimize heating schedules.

What does an E133 error code mean on my Baxi 636 Combi LPG boiler?

The E133 error code indicates a failure to ignite. Check the gas supply to ensure it is turned on and there are no obstructions. If the problem persists, contact a qualified engineer for assistance.

Can I use antifreeze in the Baxi 636 Combi LPG heating system?

Yes, you can use antifreeze in the heating system, especially if the property is prone to freezing temperatures. Use a suitable inhibitor with antifreeze properties and have it added by a professional.

How do I bleed radiators connected to the Baxi 636 Combi LPG boiler?

To bleed radiators, turn off the heating system and allow radiators to cool. Use a radiator key to slowly open the bleed valve at the top of the radiator. Allow trapped air to escape until water flows steadily, then close the valve.

Why does my Baxi 636 Combi LPG boiler keep losing pressure?

If your boiler keeps losing pressure, check for visible leaks in the system, including radiators and pipes. If no leaks are found, the issue might be with the expansion vessel or pressure release valve. Contact a professional for a thorough inspection.