18.1 To ensure the continued efficient and safe
operation of the boiler it is recommended that it is
checked and serviced regularly. The servicing must be
carried out by a competent person in accordance with
the Gas Safety (Installation and Use) Regulations. The
frequency of servicing will depend upon the particular
installation conditions and usage, but in all cases the
boiler must be serviced at least once a year.
18.2 Following servicing of the boiler the relevant
sections of the 'Benchmark' Installation,
Commissioning and Servicing Log Book must be
completed.
18.3 Prior to servicing a check of the flue operation
and terminal guard (if fitted) along with a preliminary
check of the boilers operation must be undertaken.
18.4 Ensure the boiler is cold and that both the
electrical and gas supplies to the boiler are isolated
before commencing service of the boiler.
18.5 Remove the boiler casing as follows:
Open the front panel by removing two screws at
the bottom of the boiler,
Figure 25.
Release the hermetic chamber cover by removing
two screws on both sides and by lifting them to
release from their retaining hooks
. ( Figure 26)
Release the side panels by removing the screws on
the upper and lower sides (
Figure 27 ). Remove the
panels by swinging them out and lifting them up.
18.6 Remove the combustion chamber cover by
removing four screws on sides.
(Figure 28)
18. Routine Servicing
Figure 28
Figure 25
Figure 26
Figure 27
Normal operation
FAULT FINDING CHART 5
Chwck wiring from
PCB to modulation
coil on gas valve
Does burner flame
modulate ?
Replace gas valve
No
Yes
Yes
Replace PCB
No
SECURING
SCREWS (6 OFF)
VIEWING
WINDOW
COMBUSTION
CHAMBER
COVER
SIDE PANELS
SECURING
SCREWS
(4 OFF)
SECURING
SCREWS
RETAINING
LUGS
VIEWING
WINDOW
INNER
CASING
PANEL
Page 22
1
2
SECURING
SCREWS
SERVICE PROCEDURE
1. Remove the outer case as outlined in section“Replacing Components”
2. Visually check all joints for gas/water tightness.
3. Visually inspect the flue system.
4. Check the condition of the seals around the combustion chamber.
5. Check condition of electrodes and their location.
6. Conduct a flue gas analysis of CO/CO2 ratio to confirm the combustion
gas ratio is less that 0.004. If not check the combustion chamber and
flue system for signs of leakage,damage or blockage. Remove any
obstruction and clean as necessary. If clear check burner pressures,
injectors or gas valve settings. Adjust and clean as necessary.
22
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