Glow-worm Ultracom cxi - Manual (Page 43)

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13 Servicing
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Diagram 13.2
Diagram 13.1
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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 12.5 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 13.1.
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.
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.
13.1 Servicing
NOTE: If the Combustion CO2, CO/CO2 ratio & Gas rate
checks did not require adjustment then it will not be necessary
to complete a full service.
All routine servicing requirements can be achieved by the
removal of the front panel, see diagram 13.2. Position the
control box into the service position, see diagram 13.3.
Before commencing with a service or replacement of parts.
The boiler should be isolated from the electrical and gas
supplies.
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Diagram 13.3