Glow-worm Flexicom sx - Manual (Page 29)

0020107231_04 - 12/14 - Glow-worm
MAINTENANCE
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1. Maximum Rate Check and Adjustment
NOTE: To verify the maximum gas rate CO2 setting the
appliance must be checked at the maximum rate first. 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. Wait until the CO2 value is
stable and check that the value is within the range specified in
table in the “check” column.
If the combustion reading is not within the acceptable values
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, it will necessary to adjust the
combustion rate of the appliance.
NOTE: Adjustment is made by turning the gas valve throttle
an ⅛ of a turn, waiting 1 minute to allow the appliance to
stabilise before checking or making further adjustments.
● Rotate the “throttle”(anti-clockwise to increase), to the
required CO2, refer to diagram 12.3 and the “SETTING” column
in the table.
● Exit the forced rate function, press the “mode” and “+” buttons
simultaneously, this will reset the boiler to the default display.
Now proceed to check the minimum rate adjustment.
2. Minimum Rate Check and Adjustment
● Now check the minimum gas rate CO2 setting: Press
and release the “reset” button on the controls fascia, then
immediately press and hold in either of the “+” buttons. After
approximately 5 seconds “Hi” will be displayed. Pressing the
“+” or “-” buttons will toggle between “Hi” and “Lo”. Press the
mode button when “Lo” is selected, this will force the boiler to
minimum rate and the display will flash “Lo”, indicating the boiler
is operating at minimum.
● Wait until the CO2 value is stable and check that the value is
within the range specified in table in the “check” column.
If adjustment is necessary, proceed as follows:
NOTE: Adjustment of the CO2 at minimum rate is very
coarse and should not be adjusted more than an ⅛ of
a turn at a time. Wait 1 minute to allow the appliance to
stabilise before checking or making further adjustments.
● Gradually rotate the “offset adjustment” (anti-clockwise to
decrease) to the required CO2, refer to diagram 12.3 and the
“SETTING” column in the table.
● Exit the minimum rate function, press the “mode” and “+”
buttons simultaneously, this will reset the boiler to the default
display.
3. Re-Check CO2 and check the CO/CO2
combustion ratio.
● Re-check the maximum and minimum CO2 values to ensure
that they are within the “setting” limits in the table then check
the CO/CO2 combustion ratio does not exceed the value in the
CO/CO2 column of the table. If the CO/CO2 setting exceeds the
value in the table, a complete servicing of the appliance will be
necessary, refer to section 12.1.
If the CO2 and the CO/CO2 ratio falls within the tolerances
quoted, exit the function press the “mode” and “+” buttons
simultaneously, this will reset the boiler to the default display.
Remove the analyser probe and replace the cap on the
sampling point, replace the controls fascia, inner and front
casing panels.
IMPORTANT: Remember to replace the sample point cap on
completion of the test.
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Diagram 12.2
GAS RATE CHECK
Check the gas rates as described in the commissioning section.
COMPLETION
If it is not possible to achieve the required results for either the
combustion or gas rates, it will be necessary to complete a full
service of the appliance and then repeat the combustion check
procedure. If after servicing and adjustment of the appliance
the combustion values are still unacceptable and after further
remedial work has been carried out, the appliance must be
disconnected until the CO/CO2 ratio is acceptable. Advice can
be sought from the Glow-worm Technical Helpline.
Diagram 12.3
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