Technical data
1122..00 SSEERRVVIICCIINNGG AANNDD MMAAIINNTTEENNAANNCCEE
1122..22 CCOOMMBBUUSSTTIIOONN CCHHEECCKKSS
CCOOMMBBUUSSTTIIOONN CCHHEECCKKSS AATT MMAAXXIIMMUUMM RRAATTEE
9. Set the boiler to Maximum gas rate.
10. Check the Carbon Monoxide (CO) and Carbon Dioxide (CO
2
)
readings are within the range quoted in the tables opposite
(Table 2).
11. If the combustion value(s) is outside the values specified
in Tables 1 and 2 and the integrity of the full flue system and
combustion circuit seals, the inlet gas pressure and gas rate
have been verified, it is possible to make an adjustment to the
combustion settings by adjustment of the air/gas ratio valve.
See Section 12.3 Adjustment of the Gas Valve.
2288
© Dimple
x Boiler
s 2008
1122..33 AADDJJUUSSTTMMEENNTT OOFF TTHHEE GGAASS//AAIIRR RRAATTIIOO VVAALLVVEE
CCOOMMBBUUSSTTIIOONN SSEETTTTIINNGG AADDJJUUSSTTMMEENNTT
1. Adjustment of the offset screw is not allowed.
2. If the ma
ximum rate setting is adjusted, then the
combustion values must be checked at minimum rate.
NNOOTTEE::
DO NOT ATTEMPT TO FIT OR ADJUST THE GAS/AIR
RATIO VALVE UNLESS;
• The person carrying out the measurement has been
assessed as competent in the use of a flue gas analyser
and the interpretation of the results.
• The flue gas analyser used, meets the requirements of
BS7927 or BS-EN50379-3.
• The flue gas analyser is calibrated in accordance with the
manufacturers requirements.
3. At Maximum Gas Rate; put the appliance into Service Mode
at Maximum Gas Rate (see Section 11.2).
4. W
ait
5 minut
es t
o allow the boiler to stabilise.
5. If the Carbon Dioxide (CO
2
) level is outside the required
v
alu
es gi
ven in Section 12.2 (Table 2) then adjust the throttle
screw (Fig. 48) until the CO
2
is at the correct setting level. See
Table 4. Clockwise to decrease CO
2
, anti-clockwise to increase
CO
2
.
NNOOTTEE::
Only turn the throttle in small steps of
nnoo mmoorree tthhaann
11//88
tthh
ooff aa ttuurrnn
and wait
1 minut
e aft
er
e
ach adjus
tmen
tfor
the combustion reading to stabilise.
IIMMPPOORRTTAANNTT::
After any adjustment of the gas valve, it is
essential to check the combustion levels at minimum gas
rate (Table 1). If the Carbon Monoxide or Carbon Dioxide
levels are outside the range quoted, call Dimplex Boilers Ltd
Technical Helpline on 0844 3711121. If in doubt ASK!
TTaabbllee 44
FFiigg.. 4488
NNOOTTEE::
Factory set - warranty
v
oid if adjusted
Throttle Adjuster Screw
GGaass VVaallvvee
Inlet Test Point
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9.0 11.0
SSyysstteemm 3300
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