Keston HEAT 2 55 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 55 Specifications

General

Type	Condensing
Output	55 kW
Fuel Type	Natural Gas
Mounting	Wall Mounted
ERP Rating	A
Modulation range	5:1
Max working pressure	3 bar
Temperature range	30-80°C
Water connections	1" BSP
Gas connection	22mm

Summary

SECTION 1 - GENERAL

Safety (Installation and Use) Regulations

Outlines safety regulations for installation in GB and IE, including relevant British Standards.

Flue Installation

SECTION 2 - INSTALLATION

Flue Systems

Controls Configuration, Commissioning and Testing

Outlines checks for electrical and gas installation safety before commissioning.

Initial Lighting

Safety

Safety precautions for servicing, including turning off supplies and gas soundness.

SECTION 3 - SERVICING

Servicing Schedule

SECTION 5 - FAULT FINDING

Fault Finding Menu

Overheat Lockout

Troubleshooting steps for overheat lockout faults.

Ignition Lockout

Troubleshooting guide for ignition lockout faults.

Flame Loss

Troubleshooting steps for flame loss faults.

Flow / Return Thermistor, Heat Exchanger or Flue Thermistor Fault

No CH But DHW OK

No Display

SECTION 7 - COMBUSTION & FLUE INTEGRITY CHECKS

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

Flowchart for checking CO levels and combustion ratios at maximum and minimum gas rates.