Keston HEAT 2 45 User Manual

When replacing any part on this appliance, use only spare parts that you can be assured conform to the safety and performance
specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised by Keston.
For the very latest copy of literature for specification and maintenance practices visit our website www.keston.co.uk
where you can download the relevant information in PDF format.
August 2020
UIN 220446 A01
INSTALLATION
& SERVICING
HEAT 2
45 55 45P 55P

Keston HEAT 2 45 Specifications

General

Brand	Keston
Model	HEAT 2 45
Category	Boiler
Language	English

Summary

Section 1 - General

1.3 Safety

Details installation compliance with UK and IE regulations and standards.

1.7 Gas Supply

Outlines requirements for gas supply connection, pressure, and testing.

1.8 Flue Installation

Details approved flue materials and termination requirements.

1.11 Electrical Supply

Specifies wiring compliance with IET regulations and local requirements.

1.13 Boiler Clearances and Connections

Provides minimum clearances for operation/servicing and connection details.

1.15 Sealed System Requirements

Details requirements for sealed systems, safety valves, and expansion vessels.

Section 2 - Installation

2.6 Mounting the Boiler

Instructions for lifting and securing the boiler to the wall mounting plate.

2.8 Flue Systems

Discusses approved flue systems, materials, and pipe/fitting codes.

Termination of the Flue and Air

Explains terminal positions, minimum separation, and flue/air pipe length limits.

2.9 Flue Termination Position

Provides tables for flue and air terminal spacing requirements based on proximity.

2.10 Assembly Practice

Covers fitting flue and air pipes, including solvent welding and supports.

2.15 Condensate Drain

Details condensate pipework requirements, materials, and termination options.

2.16 Boiler Water Connections

2.18 Gas Connection

2.22 Electrical Connections

2.23 External Wiring

2.24 Installer Connections

2.25 Boiler With External Controls

2.26 Controls Configuration, Commissioning and Testing

Outlines electrical and gas installation checks for commissioning.

2.29 Boiler Guided Configuration Stand Alone Boiler

Initiates the guided configuration process for a standalone boiler.

2.29.1 Initial Settings

2.29.2 Boiler setup options - Pre configuration selection

2.29.3 Advanced Configuration

2.29.4 Plant Settings

2.29.5 Boiler Configuration

2.29.6 Heating Circuit Configuration

2.29.7 DHW Configuration

2.30 Initial Lighting

Step-by-step guide for the initial lighting sequence and operational checks.

2.32 Handing Over

2.33 Safety

Emphasizes safety precautions for servicing, including gas and electrical isolation.

Section 3 - Servicing

3.1 Servicing Schedule

Recommends regular servicing intervals and checks for safe, efficient operation.

3.3 Removal of Fan and Gas Valve Assembly

3.5 Removal of Burner

3.6 Heat Exchanger Inspection / Cleaning

3.9 Removal of Fan

3.10 Removal of Gas Valve

3.11 Removal of Venturi / Air Inlet Damper

3.12 Removal of Ignition Electrode

3.13 Removal of Detection Electrode

3.15 Removal of Water Pressure Switch

3.16 Removal of Flow / Return / Heat Exchanger Thermistor

3.17 Flue Thermistor Replacement

3.18 Removal of Spark Generator

3.19 Pump Head Replacement

3.20 Removal of Main PCB

3.21 Removal of System Manager

Section 4 - Wiring

4.1 Internal Wiring Combustion Manager

Section 5 - Fault Finding

5.1 Fault Finding Screens

5.2 Fault Finding Menu

Lists hardware faults, their error codes, and references for troubleshooting.

5.3 Overheat Lockout

Troubleshooting flowchart for overheat lockout faults.

5.4 Ignition Lockout

Troubleshooting flowchart for ignition lockout faults.

5.5 False Flame Lockout / Error 20

Troubleshooting for false flame lockout and error 20.

5.6 Low Water Pressure

Troubleshooting flowchart for low water pressure faults.

5.7 Flame Loss

Troubleshooting flowchart for flame loss faults.

5.8 Fan Fault

Troubleshooting steps for fan faults.

5.9 Flow / Return Thermistor, Heat Exchanger or Flue Thermistor Fault

Troubleshooting for thermistor faults and resistance checks.

5.10 Outside / Header / Room Sensor Fault (If Fitted)

Troubleshooting for sensor faults and resistance checks.

5.11 Flow/Return Reversed

5.12 Cylinder Thermistor Fault (If Fitted)

Troubleshooting for cylinder thermistor faults and resistance checks.

5.13 External Interlock Open

5.14 No CH But DHW OK

Troubleshooting flowchart for heating circuit demand issues.

5.15 No DHW But CH OK

Troubleshooting flowchart for DHW circuit issues.

5.16 No Display

Troubleshooting steps for a blank display or no power.

5.17 0-10V Interface

Section 7 - Combustion & Flue Integrity Checks

7.1 Flowchart for CO Level and Combustion Ratio Check on Commissioning a Condensing Boiler

Flowchart for checking CO levels and combustion ratio at max/min rates.