Do you have a question about the WarmFlow Utility U90HE and is the answer not in the manual?
Explains adjustment and function of the dual thermostat for radiator temperature control.
Details how to reset the high limit thermostat after it has tripped.
Describes the function of the red reset button and when the burner locks out.
Outlines recommended system pressure levels and actions if pressure is outside range.
Instructions on using the filling loop to top up system pressure and inhibitor considerations.
Describes the user-adjustable heating thermostat and default on/off switches.
Notes on testing, accreditation, and compliance with building regulations.
Lists essential regulations and standards for boiler installation.
Explains DHW priority, heat store recovery, and pump overrun function.
Illustrates correct baffle placement for heat exchanger efficiency.
Diagrams and lists of key components for B, U, and K series boilers.
A visual representation of the boiler's operational logic for heating and hot water.
Detailed dimensional data for various boiler models (B, U, K series).
Instructions and diagrams for the safe and correct disposal of boiler condensate.
Comprehensive technical specifications for B-Series, U-Series, and K-Series boilers.
Details the wiring and function of the dual-safe thermostat in non-combi models.
Explains the wiring connections for the RDB burner control box.
Provides wiring diagrams and notes for combi boiler electrical connections.
Guides for installing optional programmers and timers, including wiring diagrams.
Diagram and explanation of a one-pipe gravity fed oil supply system.
Diagram and explanation of a two-pipe oil supply system.
Details on the installation and use of a de-aerator system for oil supply.
Diagram and explanation of a one-pipe lift system for oil supply.
Guidelines and precautions for using bio fuel in the boiler.
Lists available Warmflow flue kits and their general dimensional information.
Recommendations for the installation of conventional flues, including termination.
Instructions for fitting flue thermostats and connecting condensing boiler flue kits.
Details on various flue kits (balanced, liner), components, and flue length calculations.
Specifies minimum distances for flue terminal placement relative to building features.
Guidelines for providing combustion and ventilation air for open flue boilers.
Requirements for air supply for balanced flue boilers installed in compartments.
Covers hearth, service access, heating system preparation, air vents, and pipework.
Information on expansion vessel sizing, system filling, pressure, and relief valves.
Details mains water pressure, hardness, flow restrictors, and borehole supply considerations.
Identifies key components of the RDB burner, including pump and control box.
Explains the oil pump setup for one-pipe and two-pipe systems.
Instructions for setting and adjusting the burner electrodes.
Illustrates the normal and lockout sequences for the burner's startup process.
Guidance on adjusting the air damper for optimal combustion based on installation conditions.
Outlines the requirements for proper boiler commissioning by certified technicians.
Details the necessary annual servicing procedures and checks by qualified engineers.
A flowchart for troubleshooting common faults and issues with the Riello RDB burner.
A flowchart to diagnose and resolve central heating operational problems in combi boilers.
A flowchart to diagnose and resolve domestic hot water operational problems.
Comprehensive guide on setting up and operating the digital timer for heating schedules.
A detailed list of spare parts and their codes for the RDB 2.2 burner.
A detailed list of spare parts and their codes for the RDB 3.2 burner.
Identifies specific pipework components and their part numbers for different boiler models.
A list of essential boiler components and their corresponding part codes.
Outlines the terms and conditions of the boiler manufacturer's guarantee.
Details the requirements for maintaining the guarantee and common exclusions.
Explains adjustment and function of the dual thermostat for radiator temperature control.
Details how to reset the high limit thermostat after it has tripped.
Describes the function of the red reset button and when the burner locks out.
Outlines recommended system pressure levels and actions if pressure is outside range.
Instructions on using the filling loop to top up system pressure and inhibitor considerations.
Describes the user-adjustable heating thermostat and default on/off switches.
Notes on testing, accreditation, and compliance with building regulations.
Lists essential regulations and standards for boiler installation.
Explains DHW priority, heat store recovery, and pump overrun function.
Illustrates correct baffle placement for heat exchanger efficiency.
Diagrams and lists of key components for B, U, and K series boilers.
A visual representation of the boiler's operational logic for heating and hot water.
Detailed dimensional data for various boiler models (B, U, K series).
Instructions and diagrams for the safe and correct disposal of boiler condensate.
Comprehensive technical specifications for B-Series, U-Series, and K-Series boilers.
Details the wiring and function of the dual-safe thermostat in non-combi models.
Explains the wiring connections for the RDB burner control box.
Provides wiring diagrams and notes for combi boiler electrical connections.
Guides for installing optional programmers and timers, including wiring diagrams.
Diagram and explanation of a one-pipe gravity fed oil supply system.
Diagram and explanation of a two-pipe oil supply system.
Details on the installation and use of a de-aerator system for oil supply.
Diagram and explanation of a one-pipe lift system for oil supply.
Guidelines and precautions for using bio fuel in the boiler.
Lists available Warmflow flue kits and their general dimensional information.
Recommendations for the installation of conventional flues, including termination.
Instructions for fitting flue thermostats and connecting condensing boiler flue kits.
Details on various flue kits (balanced, liner), components, and flue length calculations.
Specifies minimum distances for flue terminal placement relative to building features.
Guidelines for providing combustion and ventilation air for open flue boilers.
Requirements for air supply for balanced flue boilers installed in compartments.
Covers hearth, service access, heating system preparation, air vents, and pipework.
Information on expansion vessel sizing, system filling, pressure, and relief valves.
Details mains water pressure, hardness, flow restrictors, and borehole supply considerations.
Identifies key components of the RDB burner, including pump and control box.
Explains the oil pump setup for one-pipe and two-pipe systems.
Instructions for setting and adjusting the burner electrodes.
Illustrates the normal and lockout sequences for the burner's startup process.
Guidance on adjusting the air damper for optimal combustion based on installation conditions.
Outlines the requirements for proper boiler commissioning by certified technicians.
Details the necessary annual servicing procedures and checks by qualified engineers.
A flowchart for troubleshooting common faults and issues with the Riello RDB burner.
A flowchart to diagnose and resolve central heating operational problems in combi boilers.
A flowchart to diagnose and resolve domestic hot water operational problems.
Comprehensive guide on setting up and operating the digital timer for heating schedules.
A detailed list of spare parts and their codes for the RDB 2.2 burner.
A detailed list of spare parts and their codes for the RDB 3.2 burner.
Identifies specific pipework components and their part numbers for different boiler models.
A list of essential boiler components and their corresponding part codes.
Outlines the terms and conditions of the boiler manufacturer's guarantee.
Details the requirements for maintaining the guarantee and common exclusions.


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