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Fig.43
Gas inlet test point
A
Fig.44
Flue adaptor test points
1
PN-0000362
2
PN-0000363
1. With the boiler operating in the maximum rate condition check that
the operational (working) gas pressure at the inlet gas pressure test
point is in accordance with BS 6798 & BS 6891. This must be AT
LEAST 18mb !
2. Ensure that this inlet pressure can be obtained with all other gas ap
pliances in the property working. The pressure should be measured
at the gas test point on the gas inlet (A).
3. Measure the gas rate— With any other appliances & pilot lights
turned OFF the gas rate can be measured. It should be:-
Tab.22
Natural gas
25 model
30 model
36 model
7.4.2
Checking combustion - chimney sweep mode
The case front panel must be fitted when checking combustion.
Ensure the system is cold and the gas and electric supplies are turned
on.
Important
The person carrying out a combustion measurement should have
been assessed as competent in the use of a flue gas analyser and
the interpretation of the results.
1
Combustion test point
2
Incoming air for combustion test point
Important
Allow the combustion to stabilise before inserting the Combustion
Analyser Probe into the Test Point (1). This will prevent saturation
of the analyser.
The combustion must be measured and recorded at the Maximum and
Minimum heat inputs.
3
2.71 m
/h
3
3.26 m
/h
3
3.81 m
/h
7 Commissioning
49
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