Keston C25 Installation Manual download pdf (Page 41)

6. ROUTINE (ANNUAL) SERVICING

To ensure the continued safe and efficient operation of the boiler it is necessary to carry out

routine servicing at regular intervals. The frequency of the servicing will depend upon the particular

operating conditions, but it is recommended that an annual service should be carried out by a

qualified engineer.

It is the law that any service work must be carried out by competent qualified persons.

NB: When servicing ensure that the gas and electrical supplies to the boiler are isolated before

any work starts. It should be noted that turning the user control know fully anticlockwise to

“Standby” does not isolate the electrical supply and parts of the boiler will remain live.

Hazardous materials are not used in the construction of the Celsius 25. However, due

care should be taken when handling boiler components.

All joints should be checked for soundness after servicing and before firing the appliance.

After servicing complete the Gas Boiler Commissioning Checklist - Service Interval Record

(Chapter 9). These forms (Chapter 9) should be kept in a safe place for the life of the boiler.

6.1 Pre-Service Checks

It is recommended that an inspection should be carried out prior to shutting down the unit

for servicing. Remove the front cover by removing the screws retaining the top and

bottom. The following items should be observed:

a. Smooth starting and running of the blower.

b. Smooth lighting of the burner.

c. Check for leakage of gas, gas/air or combustion products.

d. Check for condensate leaks.

e. Check that the pump error LED (red) does not indicate high or low flow rate at any

time during operation.

f. Check for water soundness.

g. Inspect the flue vent and air intake pipework. Joints must be sound and all

pipework well bracketed.

h. Check that there is a steady fall back to the boiler from the flue pipe to allow

condensate to run back into the boiler.

i. With the boiler operating at a low return temperature (i.e. less than 50

C) check

that the condensate flows freely from the condensate line.

6.2 Recommended Routine Service

a. Remove the outer case by first removing the securing screws at the top and

bottom of the appliance.

b. Remove the burner head (Section 7.6) and inspect the burner appearance. Black

markings or other discoloration's on the gauze indicate too much gas or a lack of

air possibly due to a blocked air inlet. Any breakage's or damage to the burner

mesh indicate the burner must be replaced.

c. If necessary clean the burner with a mild household detergent and rinse under a

hot running tap.

d. If necessary, from visual inspection, clean the heat exchanger using a suitable

stiff plastic bristle brush, vacuum out any large particles and flush the heat

exchanger with fresh water until the water flowing from the condensate drain is

clear.

e. Remove the condensate trap (Section 7.8) and clean by flushing through with

clean running water.

f. Check the electrode assembly mounted on the heat exchanger. If the point is

damaged or burnt replace it.

Check that the spark gap measures 3 mm.

g. Replace the burner head, renewing the gasket if necessary, and reconnect the

gas/air supply. Ensure the flanged gas/air supply joint is air tight.

WD209/1/2000 Chapter 6 : Servicing The Keston Celsius 25 & 25P

Installation & Servicing Instructions

Page : 38

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