Glow-worm Betacom2 - Manual (Page 37)

0020145065_01 - 09/12 - Glow-worm
G31 burner % CO
2
Model Check (case on) Setting (case off) CO/CO
2
ratio
24 10.3 ± 0.3% 10.1 ± 0.2% 0.004
28 10.3 ± 0.3% 10.1 ± 0.2% 0.004
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.
i IMPORTANT:
Adjustment is made by turning the throttle an ⅛ of a
turn, waiting 1 minute to allow the appliance to stabilise
before checking or making further adjustments.
• Remove the sticker covering the “throttle” adjustment screw,
if fitted.
• Rotate the “throttle” (1) (anti-clockwise to increase), to the
required CO
2
, refer to previous diagram and the “Setting”
column in the table.
• When you have finished, press the On/Off button to exit the
test modes.
• Remove the analyser probe and replace the cap on the
sampling point, replace the controls fascia, and the front
casing panel.
i IMPORTANT:
Remember to replace the sample point cap on
completion of the test.
17.3.4 Gas rate check
• Check the gas rates as described in the commissioning
section.
17.3.5 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/CO
2
ratio is acceptable.
• Advice can be sought from the Glow-worm Technical Helpline.
17.4 Servicing
i IMPORTANT:
If the annual check of combustion CO2, CO/CO2 ratio
checks did not require adjustment and the inspections
described in "Preliminaries" were satisfactory 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.
• Position the control box into the service position.
• Before commencing with a service or replacement of parts,
isolate the boiler from the electrical and gas supplies.
17.4.1 Service interval record
• Refer to benchmark Service Interval Record at the rear of this
manual.
17.5 Silencer
A
B
C
3
1
2
Key
1 Silencer retaining screw
2 fixed silencer
3 Removable silencer
• Remove the silencer retaining screws (1) and remove the
silencer (3).
• Clean the interior of the silencer with a dry cloth if necessary,
taking care not to damage the internal foam.
• Repeat the operation in reverse order to replace the silencer.
MAINTENANCE
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