12 Servicing
13272
12.7 Combustion Check
With the appliance operational connect the CO
2
combustion
analyser to the test point, see diagram 12.10.
IMPORTANT:
Remember to replace the cap on
completion of the test.
Check the burner % CO
2
at maximum rate is as shown in the
“CHECK” column of the table and if the reading falls within
the tolerance, disconnect the analyser, fit the test point cap
and return to functional checks - gas rate.
If adjustment is required remove the front and inner casing
panels, see diagram 12.1. Taking care not to touch any
internal components, proceed as follows:
Press the “reset” button on the controls fascia, release
and immediately press and hold in the “+” button. After
approximately 5 seconds “Hi” will be displayed. Pressing
the mode button when “Hi” is selected will force the boiler
to maximum rate, the display will flash between “Hi” and the
“default display” this will indicate the boiler has been forced
to maximum.
Adjust the %CO
2
to the value shown in the “SETTING”
column of the table with the throttle, see diagram 11.3.
(Rotate anti-clockwise to increase).
To exit the check sequences press the “mode” and “+”
buttons simultaneously, this will reset the boiler to the default
display.
Check the burner %CO
2
at minimum rate is as shown in the
“CHECK” column of the table.
Press the “reset” button on the controls fascia, release
and immediately press and hold in the “+” button. After
approximately 5 seconds “Hi” will be displayed. Pressing the
“+” or “-” buttons will cycle between “Hi” and “Lo”. Pressing
the mode button when “Lo” is selected will force the boiler
to minimum rate, the display will flash between “Lo” and the
“default display” this will indicate the boiler has been forced
to minimum.
Adjustment of the %CO
2
at minimum rate is very coarse
so carefully adjust the %CO
2
to the value shown in the
“SETTING” column of the table with the offset adjustment,
see diagram 11.3 (Rotate clockwise to increase).
To exit the function press the “mode” and “+” buttons
simultaneously, this will reset the boiler to the default display.
12.8 Gas Rate Adjustment
This appliance incorporates a pre-mix burner and cannot be
adjusted, however, it is acceptible to set the combustion rate
with a flue gas analyser as described in section 12.7.
12.9 Inner Casing Panel Seal check
Check the condition of the seal, if worn or damaged remove
the seal and thoroughly clean the casing surface before fitting
the new seal, see diagram 12.11.
Refit the inner casing panel.
NOTE: Ensure the seal is fitted correctly giving an airtight
joint.
12.10 Service Completion
On completion of the service the “Benchmark” Service
Record should be completed.
13566
Diagram 12.10
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