Keston System s30, Installation And Servicing Instructions

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Installation and Servicing
SECTION 3 - SERVICING
3.1 SERVICING SCHEDULE
F or the very latest copy of literature for specification & maintenance practices, visit our website www.keston.co.uk, where you will
be able to download the relevant information. .
WARNING. Always turn OFF the gas supply at the gas service cock, and switch OFF and disconnect the electricity
supply to the appliance before servicing.
Combustion testing must be carried out by a competent person using a combustion analyser conforming to BS7927.
To ensure the continued safe and efficient operation of the appliance it is recommended that it is checked at regular intervals and
serviced as necessary. The frequency of servicing will depend upon the installation condition and usage but should be carried out
at least annually.
It is the law that any service work must be carried out by a Gas Safe Registered Engineer. In IE service work must be carried out
by a Registered Gas Installer (RGII).
INSPECTION
1. Light the boiler and carry out a pre-service check, noting
any operational faults.
2. Check the flue terminal (and terminal guard if fitted) is
undamaged and clear of any obstruction.
3.
Check all water and gas joints for signs of leakage.
Remake any suspect joints ensuring a gas tightness
check is carried out if applicable and the water system is
correctly refilled, vented and re-pressurised.
CLEANING PROCEDURE
Note. In order to carry out either servicing or replacement of
components the boiler front panel must be removed.
Refer to Section 3.2.
1. Clean the main burner. Refer to Section 3.4.
2. Clean the heat exchanger & condensate trap/siphon.
Refer to Sections 3.5 & 3.6.
3. Check the main injector for blockage or damage. Refer to
Section 3.3.
4. Check that the flue terminal is unobstructed and that the
flue system is sealed correctly.
The cleaning procedures are covered more fully in Sections
3.3 - 3.7 and MUST be carried out in sequence.
IMPORTANT.
5.
After completing the servicing or exchange of components
always test for gas tightness.
6. When work is complete the front panel MUST be correctly
refitted, ensuring that a good seal is made.
Do NOT OPERATE the boiler if the front panel
is not fitted.
7. If, for any reason, the condensate trap/siphon has been
removed ensure the trap is refilled with water before
reassembling.
8. Check the gas consumption.
9. Check combustion by connecting the flue gas analayser
to the flue gas sampling point as shown in the diagram
and measure CO & CO
2
.
If the CO/CO
2
ratio is greater than 0.004 AND the integrity
of the complete flue system and combustion circuit seals
have been verified and the inlet gas pressure (and gas
rate) have been verified, then contact Keston.
10. Complete the service section in the Benchmark
Commissioning Checklist.
GENERAL
Please Note : During routine servicing, and after any maintenance
or change of part of the combustion circuit, the following must be
checked:
- The integrity of the flue system and the flue seals,
- The integrity of the boiler combustion circuit and the relevant
seals
- The operational (working) gas inlet pressure at maximum rate.
- The gas rate
- The combustion performance.
COMPETENCE TO CARRY OUT THE CHECK OF
COMBUSTION PERFORMANCE
Please Note : BS 6798:2009 Specification for installation and
maintenance of gas-fired boilers of rated input not exceeding
70kW net advises that:
- The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas
analyser and the interpretation of the results.
- The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers requirements,
and
- Competence can be demonstrated by satisfactory completion
of the CPA1 ACS assessment, which covers the use of
electronic portable combustion gas analysers in accordance
with BS7967, Parts 1 to 4.
Flue
sampling
point
SER
VICING