Checking The Inlet Pressure; Lighting The Boiler - Biasi BASICA COND User Manual And Installation Instructions

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.
7.8

Checking the inlet pressure

• Remove the boiler front panel, see section
"Dismantling the external panels" on page
75.
• With the boiler switched on at full rate (maxi-
mum output power), check the supply pres-
sure by using the 27 point in Fig. 7.8 and
compare the value with that reported on the
Gas supply pressure table (minimum inlet
pressure) in section "Technical data BASI-
CA COND 24C (M275V.2024 SM)" on pag.
24, "Technical data BASICA COND 28C
(M275V.2428 SM)" on pag. 28 and "Tech-
nical data BASICA COND 32C (M275V.2832
SM)" on pag. 32.
• Ensure the test nipple 27 in Fig. 7.8 is firmly
closed.
27
Fig. 7.8
COMMISSIONING
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 sup-
ply which has a zero set governor then it
is necessary under the Gas Safe (Installa-
tion and Use) Regulations 26.9. to perform
a combustion analysis test for CO/CO
(The limits for the boiler is given in sec-
tion "Technical data BASICA COND 24C
(M275V.2024 SM)" on pag. 24, "Technical
data BASICA COND 28C (M275V.2428 SM)"
on pag. 28 and "Technical data BASICA
COND 32C (M275V.2832 SM)" on pag. 32:
CO
complete the Certificate of Exemption sec-
tion of the Benchmark.
Important: after the checks all of the test
points must be sealed and tested for tight-
ness.
7.9
Some products incorporate an anti cycling
time delay. It is normal when first switching
the boiler on for the boiler to operate on heat-
ing for a few seconds then switch off. After
3-4 minutes has elapsed the boiler will then
re ignite and operate perfectly normally. The
ignition delay cycle does not prevent normal
operation of the boiler to provide D.H.W.
If external controls are fitted (e.g. Timeclock,
room thermostat) ensure they "call for heat".
• Electrically power the boiler by switching on
the double pole isolation switch. The LCD
display shows the OFF status (only the
heating and DHW antifreeze functions are
active) (Fig. 7.9).
contents / other flue gas figures) and
2

Lighting the boiler

2
- 57 -