- 57 -
INST
ALLA
TION
COMMISSIONING
Fig. 7.5
Sampling points
Flue exhaust
7.6 Checking the gas supply pres-
sure
This boiler has been factory tested to the
highest quality control standards and set
for the minimum and maximum gas work-
ing 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 ex-
periencing a harmonic noise from the boil-
er. In these circumstances, it may be nec-
essary to reset the burner gas pressures
in accordance with section 11 Gas Valve of
the Service Manual.
It should be noted that a Flue Gas Analyser
is required for this procedure.
7.7 Checking the inlet pressure
• Remove the boiler body's front panel, see
section "Dismantling the external panels" to
page 72.
• When the boiler is switched off (out of or-
der), check the supply pressure by using the
33 point in Fig. 7.6 and compare the value
read with that reported on the Gas supply
pressure table in the "Technical Data" sec-
tion (pag. 28 Activ A Plus 16S, pag. 30 Activ
A Plus 25S.
• Close well the pressure point 33 in Fig. 7.6.
Fig. 7.6
A
B
33
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 (Instal-
lation and Use) Regulations 26.9. to per-
form a combustion analysis test for CO/
CO2 (The limits for the boiler is given in
"Technical Data" section pag. 28 Activ A
Plus 16S, pag. 30 Activ A Plus 25S: CO2
contents / other flue gas figures) and com-
plete the Certificate of Exemption section
of the Benchmark.
Important: after the checks all of the test
points must be sealed.
7.8 Lighting the boiler
Some products incorporate an anti cycling
time delay. It is normal when first switching
the boiler on for the boiler to operate on heat-
Содержание Activ A 25S
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