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Fig. 7.3
An alternative, to the removal of the flue el-
bow, pour the water through the flue sam-
pling point (Fig. 7.4).
Fig. 7.4
7.6
Checking the gas supply
pressure
This boiler has been factory tested to
the highest quality control standards
and set for the minimum and maximum
gas working pressures, connected to a
1 m flue and a gas supply pressure of
20 mbar.
Any variation in gas supply pressure or
flue length may result in the customer
experiencing a harmonic noise from the
boiler. In these circumstances, it may be
necessary to reset the burner gas pres-
sures in accordance with section Gas
Valve of the Service Manual.
It should be noted that a Flue Gas Ana-
lyser is required for this procedure.
- 58 -
COMMISSIONING
Sampling points
Flue exhaust
7.7
Checking the inlet pressure
• Remove the boiler front panel, see sec-
tion "Dismantling the external panels" on
page 73.
• With the boiler switched on at full rate
(maximum output power), check the sup-
ply pressure by using the 23 point in Fig.
7.5 and compare the value with that re-
ported on the Gas supply pressure table
(minimum inlet pressure) in the section
"Technical data ADVANCE 15OV" on
page 24, "Technical data ADVANCE
18OV" on page 27 and "Technical data
ADVANCE 24OV" on page 30.
• Ensure the test nipple 23 in Fig. 7.5 is
firmly closed.
A
B
23
Fig. 7.5
If it does not comply with the required pres-
sure check the gas supply line and governor
for faults and/or correct adjustment.
Where the boiler is connected to a gas
supply which has a zero set governor
then it is necessary under the Gas Safe
(Installation and Use) Regulations 26.9.
to perform a combustion analysis test
for CO/CO
(The limits for the boiler is
2
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