A
Gas inlet test point
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
17mb !
2. Ensure that this inlet pressure can be obtained with all other gas
appliances in the property working. The pressure should be measured
at the test point on the gas cock.
3. Measure the gas rate — With any other appliances & pilot lights
turned OFF the gas rate can be measured. It should be:-
Tab.26 Natural gas
224 model
2.61 m
3
/h
228 model
3.06 m
3
/h
424 model
2.61 m
3
/h
428 model
3.06 m
3
/h
See
Technical information - LPG, page 75 for LPG values
7.4.2
Checking combustion - chimney sweep mode
See
If the appliance cannot be operated on central heating for more
than 10 minutes without reaching maximum temperature refer to
Combustion check on small heating systems, page 74.
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.
Fig.43
Gas inlet test point
A
PN-0000362
Fig.44
Flue adaptor test points
PN-0000363
1
2
7 Commissioning
48
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