Keston Celsius 25 User Instruction

WD211/0/2000

Users Instructions

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 Celsius 25 is a high efficiency central heating condensing boiler
designed to provide central heating and indirect sanitary hot water supply.
They are designed for use with fully pumped systems only. This boiler is
supplied for natural gas use 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 servicable 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 : 100 mm, Bottom : 100 mm, Left : 1 mm,
Right : 1 mm & Front : 305 mm. Extended clearance is required to the front to
allow for access for servicing.

Cleaning

Normal casing cleaning only requires dusting with a dry cloth. To remove
more stubborn marks wipe with a damp cloth and finish with a dry cloth.

WD211/0/2000

Boiler Setup

1) Check that the gas supply from the gas meter is turned ON

2) Switch on the electric supply to the boiler and controls and set the heating
controls to call for heat.

To Light The Boiler

Switch the user control knob fully anticlockwise to the standby position. Wait 5
seconds then turn the user control know clockwise to the temperature required. The

following sequence will occur:

1) The Mains (Green) LED will illuminated
continuously. If the green lamp flashes slowly

Mains (Green)

Boiler On (Yellow)

Lockout (Red)

User Control

(shown in "off" position)

Knob

BOILER
FASCIA

Water Flow (Red)

DISPLAY

Modulation/Diagnostic
1 to 4 (Green)

set your external controls to ON.

2) After about 15 seconds the module will
ignite and the Boiler On LED (Yellow) will
illuminate continuously.

3) The boiler will adjust the output to best
match the demands of the system. The
Modulation/Diagnostics LED's (Green) will
indicate the output of the boiler at any given
time.

The boiler is now running correctly and will
proceed to switch itself on and off as the
heating reaches its operating temperature.

If the Boiler On (Yellow) LED goes out and the Lockout (Red) light flashes, due to a
failure to ignite or an interruption to the gas supply, turn the User Control Knob to the
standby position (fully anticlockwise), wait for 10 seconds and turn the boiler on
again as described above in To Light The Boiler. If the boiler still fails to ignite after
five successive attempts contact your Installer or Service Engineer.

Precautions

Care must be taken at all times to ensure that no blockage or obstruction is
present in the condensate drainage line. In addition the air intake and flue
exhaust terminals of the appliance must be free of obstruction at all times.

Frost Protection

The Celsius 25 has an integral frost protection thermostat. However, care
should also be taken to ensure that any exposed pipework is adequately
insulated to prevent freezing.

Gas Leak or Fault

If you suspect a gas leak turn off the appliance immediately, turn off the gas
tap to the appliance and contact your local gas region without delay.
If you suspect a fault with the appliance it must not be used until the fault has
been corrected by a competent person.

In the unlikely event of a breakdown consult your Installer or Service Engineer