17
SECTION 3 - SERVICING
3 SERVICING
3.1 SERVICING SCHEDULE
F
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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, or in other countries a qualified and
competent Gas Installer.
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 upper and lower front panels
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 3.10.
4.
Check that the flue terminal is unobstructed and that the
flue system is sealed correctly.
ALSO IF THE DHW FLOW RATE IS IN QUESTION :-
5.
Check the DHW filter for blockage. Refer to Section 3.28.
The cleaning procedures are covered more fully in Sections
3.3-3.7 and MUST be carried out in sequence.
IMPORTANT.
6.
After completing the servicing or exchange of components
always ensure all gas valve connections are gas tight with
a gas soundness check up to the gas control valve.
7.
When work is complete the front panels MUST be
correctly refitted, ensuring that a good seal is made.
Do NOT OPERATE the boiler if the upper front
panel is not fitted.
8.
If, for any reason, the condensate trap/siphon has been
removed ensure the trap is refilled with water before
reassembling.
9.
Check the gas consumption if on metered installations.
10.
Check combustion by connecting the flue gas analyser 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 have been
verified, then contact Morco.
Flue Sampling Point
Air Sample
Point
Ensure all caps and seals
are re-fitted after use
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. Turn on one or more DHW taps
- 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.
SERVICE MODE
To access the service mode:
Press and hold the restart and function button for 5 seconds.
The display will show the last 3 fauls followed by “
S H
”.
