Contents

Contents
1 Key to symbols and safety instructions
- 1.1 Key to symbols
  - Warnings
  - Important information
  - Additional symbols
  - Abbreviations used in this manual
  - Read these instructions before starting any installation
- 1.2 General safety instructions
- 2 Installation regulations
  - 2.1 Complying with the building regulations
    - Installation
- 3 Appliance information
  - 3.1 General information
    - Standard package:
  - 3.2 Technical data
  - 3.3 Energy efficiency
  - 3.4 Layout and components - 18/25 System appliance shown
  - 3.5 Layout and components - 18/25 Regular appliance shown
- 4 Pre-Installation
  - 4.1 Cleaning primary systems
    - 4.1.1 Before cleaning the system:
    - 4.1.2 Flushing the system
    - 4.1.3 Appliance drain points
    - 4.1.4 Appliance vent points
    - 4.1.5 Inhibitor
      - Water treatment products
    - 4.1.6 Artificially softened water
  - 4.2 Mains supply
    - 4.2.1 Electrical supply
  - 4.3 Oil supply
    - 4.3.1 Single pipe gravity feed system:
      - Maximum pipe run for single pipe gravity fed system
    - 4.3.2 Double pipe sub-gravity feed system:
      - Maximum pipe run for double pipe sub-gravity fed system
    - 4.3.3 Single pipe suction lift with de-aerator:
      - Maximum pipe run for single pipe suction lift with de-aerator
    - 4.3.4 Pipework
    - 4.3.5 Boiler isolation valve
  - 4.4 Water systems and pipework
    - Primary system plastic pipework:
    - Primary system/connections/valves:
    - Open vent primary system (Regular only)
    - Fully pumped sealed primary system:
    - Filling primary sealed systems
  - 4.5 Condensate discharge
    - 4.5.1 Condensate pipe work
    - 4.5.2 Internal connections
    - 4.5.3 External connections
  - 4.6 Pressure relief pipework
  - 4.7 Boiler locations and clearances
    - Open flue model (CF)
    - Room sealed balanced flue models (RS)
    - Installation clearances
    - Service clearances
    - Maintenance clearances
    - Minimum air vent area (cm3) for appliances installed in compartments
    - Compartments
    - Venting compartments
    - Rooms containing a bath or shower
  - 4.8 Flue terminal positions
  - 4.9 Flue options
    - 4.9.1 Conventional flue (CF)
    - 4.9.2 Room sealed flue options
      - Calculating the flue length
      - Flue extension lengths
      - Flue terminal lengths
- 5 Installation
  - 5.1 Unpacking the boiler
    - Unpacking
  - 5.2 Pipework positions and flue opening
    - Safety
    - Pipework connections - Regular
    - Pipework connections - System
    - Flue centres
    - Flue opening
  - 5.3 Boiler installation
  - 5.4 Flue installation
    - 5.4.1 Flue damper installation
    - 5.4.2 Installation notes
  - 5.5 Combustion chamber (18/25 Regular shown)
  - 5.6 Pipework connections
    - Water connections
    - Return pipe connection
    - Oil supply connections
    - Condensate connection
    - Fire valve
  - 5.7 Oil burner and pump
    - Oil burner nozzle
    - Burner head adjustment
    - Oil pump - Single pipe connection
    - Oil pump - two pipe connection
  - 5.8 Refitting components
  - 5.9 Electrical
    - Access to 230V connections
    - 230V connections
    - External 230V programmer
    - Optional Worcester 230V programmer
    - 230V Standard wiring diagram
    - Pre-wired remote 2 or 3 port valve control set using internal programmer
    - Remote 10 way junction box (O) requirements:
    - Internal programmer requirements, 2 & 3 port valve control sets
    - Internal programmer requirements, 3 port valve control sets
    - Pre-wired remote 2 or 3 port valve control set using remote programmer
    - 2 Port valve control set
    - 3 Port valve control set
- 6 Commissioning
  - 6.1 Pre-Commissioning checks - 18/25 Regular shown
  - 6.2 Filling the system
  - 6.3 Water treatment
    - Flushing (Central Heating)
    - Inhibitor (Central Heating)
    - Water treatment products
  - 6.4 Starting the appliance
    - 6.4.1 Single pipe gravity feed system
    - 6.4.2 Double pipe sub-gravity feed systems and single pipe suction lift with de-aerator:
    - 6.4.3 Pump adjustments
    - 6.4.4 Burner head setting
    - 6.4.5 Boiler lockout indicator on
    - 6.4.6 Combustion checks
      - Nominal boiler rating at normal operating temperature using Kerosene (Class C2)
    - 6.4.7 Central heating
  - 6.5 Finishing commissioning
    - 6.5.1 Hand over
    - 6.5.2 Appliance guarantee
      - Guarantee registration
- 7 Service and Spares
  - 7.1 Inspection and service - 18/25 Regular shown
    - Routine servicing
  - 7.2 Pre-service checks
  - 7.3 Service requirements
  - 7.4 Sealed system only
  - 7.5 Clean the burner
  - 7.6 Oil burner nozzle
  - 7.7 Pump filter
  - 7.8 External oil filter
  - 7.9 Combustion chamber - 18/25 Regular shown
  - 7.10 Oil supply system and tank
  - 7.11 Clean the boiler - Manifold access
  - 7.12 Re-commissioning the burner
  - 7.13 After service hand over
  - 7.14 Spares
- 8 Fault finding and diagnosis
  - 8.1 Burner functions
  - 8.2 Heating and hot water
  - 8.3 Boiler function
  - 8.4 Logic for the 535 SE/LD RDB control box
  - 8.5 Riello control box 12/18 model
    - 8.5.1 Control box LED codes
      - Last lockout memory feature
    - 8.5.2 Fault finding
    - 8.5.3 Flame sensing photocell 12/18 models
    - 8.5.4 Flame sensing photocell 18/25 and 25/32 models
  - 8.6 Oil supply vacuum testing
  - 8.7 Air pressure switch and flue overheat reset
  - 8.8 Air pressure switch connections
  - 8.9 Oil appliance commissioning checklist
  - 8.10 Service interval record

Worcester Kitchen Regular System 12/18 2018 User Instructions

Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler manual cover

Pages 64

Year 2018

Language(s)

of 64

Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler Specification

The Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler is a high-performance heating solution designed for residential applications. This boiler is engineered to deliver efficient and reliable heating, featuring an output capacity ranging from 12 to 18 kW, making it suitable for medium-sized homes. It operates on natural gas, ensuring compatibility with standard residential fuel supplies. The system boasts a compact design, facilitating easy installation in kitchen or utility room settings, with dimensions that allow it to fit seamlessly into contemporary cabinetry.

Equipped with advanced heat exchanger technology, the boiler maximizes energy conversion efficiency, achieving an A-rated efficiency classification under the ErP (Energy-related Products) directive. This ensures reduced operational costs and lower carbon emissions, aligning with modern energy-saving standards. The boiler incorporates a user-friendly control interface, offering intuitive operation and precise temperature management. It is compatible with smart thermostat systems, allowing for remote control and integration into home automation setups.

Safety features include an integrated frost protection mechanism, preventing potential damage from low temperatures, and an overheat cut-out system that ensures safe operation under all conditions. The Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler also includes a comprehensive warranty, providing peace of mind and support for maintenance and repairs. With a robust construction designed for longevity, this boiler represents a reliable choice for homeowners seeking a balance of performance, efficiency, and ease of use in their central heating systems.

Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler F.A.Q.

How do I reset my Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler after a fault?

To reset your Worcester boiler, locate the reset button on the control panel, press it, and hold for a few seconds until the reset indicator light stops flashing.

What should I do if my Worcester boiler is not heating water?

Check if the thermostat is set correctly, ensure the boiler is powered on, and inspect the pressure gauge to make sure it is within the recommended range. If the problem persists, consult a qualified technician.

How often should I service my Worcester Kitchen Regular and Kitchen System 12/18 2018 Boiler?

It is recommended to service your boiler annually to ensure it operates efficiently and safely.

Why is my Worcester boiler making a loud noise?

Noises can be caused by air in the system, low water pressure, or a failing component. Bleed the radiators to remove air or check the pressure. If the noise continues, contact a professional.

How can I increase the pressure in my Worcester boiler?

Locate the filling loop and slowly open the valves to allow water to enter the system, watching the pressure gauge until it reaches the recommended level. Close the valves afterward.

What is the ideal pressure for my Worcester Kitchen System 12/18 Boiler?

The ideal pressure for your boiler should be between 1.0 and 1.5 bar when the system is cold.

How do I bleed a radiator connected to my Worcester boiler system?

Turn off the heating, use a radiator key to open the bleed valve slightly, and let the air escape until water starts to drip out. Close the valve tightly afterward.

Can I install a smart thermostat with my Worcester boiler?

Yes, most modern Worcester boilers are compatible with smart thermostats. Check your boiler's manual for compatibility information and installation instructions.

Why is my Worcester boiler not firing up?

Ensure the boiler has power and the thermostat is set correctly. Check for any error codes and refer to the manual. If unsure, contact a professional technician.

What maintenance tasks can I perform on my Worcester boiler to ensure efficiency?

Regularly check the pressure, bleed radiators, and keep the area around the boiler clear. Annual servicing by a qualified technician is also recommended.