Keston C55 User Manual

Users Instructions For C40,
C40P, C55 and C55P Models
The Gas Safety (Installation And Use) Regulations: 1996 (as amended) impose certain statutory
obligations on gas users. Further information regarding these regulations can be obtained from your
Gas Supplier.
All gas appliances must be installed by competent persons by law in accordance with these
regulations. Membership of CORGI is indication of such a competent person with regard to gas
installation.
It is in your interests, and that of safety, to ensure that the appliance is installed correctly and that the
law is complied with. Failure to do so could lead to a hazardous &/or potentially dangerous situation.
Introduction
These instructions should be carefully read to ensure safe and economical
use of your boiler.
The Keston C40 and C55 are high efficiency central heating condensing
boilers designed to provide central heating and indirect sanitary hot water
supply. They are designed for use with fully pumped systems only. The C40
and C55 models are supplied for natural gas use only. The C40P and C55P
models are supplied for LPG only.
Servicing
To ensure continual safe and efficient operation of the boiler it is
recommended that the appliance be checked and serviced as necessary at
regular intervals. Generally once per year will be sufficient. It is the law that
any servicing must be carried out by a competent person.
NB: There are no user serviceable parts inside the boiler cabinet. The
cabinet should only be removed by a qualified competent person.
Clearances
If fixtures are to positioned close to the boiler the following minimum
clearances must be observed: Top : 150 mm, Bottom : 150 mm, Left : 25 mm, Right :
25 mm & Front : 305 mm. Extended clearance is required to the front to allow for
access for servicing.
WD274/1/2002
page i

Keston C55 Specifications

General

Model	C55
Category	Boiler
Output	55 kW
Fuel Type	Natural Gas
Warranty	5 years
Boiler Type	Condensing
Mounting	Wall Mounted
Type	Commercial

Summary

Introduction to Keston Boilers

Boiler Description

Describes the Keston C40 and C55 as high efficiency condensing boilers for central heating and indirect sanitary hot water.

Boiler Servicing and Clearances

Servicing Recommendations

Recommends annual servicing by a competent person and notes no user-serviceable parts inside.

Installation Clearances

Specifies minimum clearances required around the boiler for installation and servicing.

Cleaning and Boiler Setup

Casing Cleaning Instructions

Instructions for cleaning the boiler casing using a dry or damp cloth.

Boiler Setup Steps

Checks for gas supply and electrics, setting heating controls to call for heat.

Operating the Boiler

Dual Thermostat Operation

Explains setting temperatures for two zones and how the boiler responds.

Boiler Ignition Sequence

Details the display codes indicating the boiler's ignition and operation stages.

Operational Precautions and Protection

Obstruction Precautions

Ensures condensate line, air intake, and flue exhaust terminals remain unobstructed.

Frost Protection

Details the integral frost protection thermostat and need for pipe insulation.

Boiler Error Codes and Troubleshooting

General Error Codes

Lists common error codes (E00-E11) and their descriptions for fault diagnosis.

Advanced Error Codes

Lists advanced error codes (E18-E44) related to flow, return, and pressure issues.

Gas Leak and Fault Procedures

Suspected Gas Leak

Immediate actions for a suspected gas leak: turn off appliance/gas, contact gas region.

Breakdown Consultation

Consult installer or service engineer for breakdowns, advising fault display and description.

Benchmark Initiative

Installation, Commissioning, and Service Record

Details the Benchmark Log Book for recording installation, commissioning, and service visits.

CORGI Registered Installers

Information on using CORGI registered installers for installation and servicing.