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11 GAS vALvE
11.1 function
The gas valve A in Figure 11.1 controls the gas inflow to the boiler
burner.
A
figure 11.1
By means of an electric command given to the on-off operators
the passage of the gas through the Gas valve can be opened or
closed.
11.2 description of the parts
(figure 11.2)
B Maximum gas pressure adjustment
C Minimum gas pressure adjustment
d On-off operators
E On-off operators electric connector
f Gas valve inlet pressure test point
f
figure 11.2
- 30 -
GAS vALvE
11.3 Adjustment
Check the supply pressure before making any adjustment
to the gas valve.
1 Close the gas inlet valve.
2 Remove the front panel of the case and lower the control
3 Loosen the internal screw on the Inlet Pressure Test Point F
4 Open the gas inlet valve.
5 Turn on the electricity supply to the boiler, switching on the
6 Set the boiler in c.h. / d.h.w. function as illustrated in Figure
figure 11.3
7 Open at least one hot water tap fully.
8 Read the inlet pressure value and ensure that it is within the
9 Switch off the boiler close the gas inlet valve and close the
10 Disconnect the pressure gauge and close the Inlet Pressure
Gas valve adjustment
B
11 Fit the probe of the flue analyser in the flue exhaust sampling
C
d
E
figure 11.4
12 Turn on the boiler, switching on the fused spur isolation
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent.
panel (see sections 2.2 and 2.3).
(Figure 11.2) of the Gas valve and connect a pressure gauge
using a suitable hose.
fused spur isolation switch.
11.3.
limits given in the table Gas supply pressures, of the user/
installation manual. If it does not comply with the required
pressure check the gas supply line and governor for faults
and/or correct adjustment.
water tap.
Test Point F (Figure 11.2).
The person carrying out a combustion measure-
ment should have been assessed as competent in
the use of a flue gas analyser and the interpretation
of the results. The flue gas analyser used should be
one meeting the requirements of BS7927 or BS-
EN50379-3 and be calibrated in accordance with the
analyser manufacturers' requirements, and have a
current calibration certificate.
point located on the exhaust pipes of the boiler (Figure 11.4).
air intake
sampling point
C.h. / d.h.w.
function
flue
exhaust
sampling point
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