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9.0
COMMISSIONING
9.2
Checking the Burner Pressure
1. Turn on the gas and electrical supplies to the boiler
and ensure that all external controls are calling for
heat.
2. Set the hot water and central heating temperature
controls to maximum and the selector switch to the
OFF position (Fig. 37).
J
3. Slacken the pressure test point sealing screw on
the gas valve and connect a pressure gauge (Fig. 38).
4. Disconnect the sensing tube from the gas valve.
5. Turn the selector switch fullyanticlockwise against
the spring pressure to the reset position and hold for 2
seconds to reset the boiler.
6. Turn the selector switch to the Cental Heating and
Domestic Hot Water position (OfF). The power ON
light (Q) willilluminate (Fig. 37).
7.
Turn
on a hot water tap to give a flow rate of at
least 10 I/min.
8. The pressure should be :-
NG
Propane
10.2 mbar
21.8 mbar
Ifnot, check that the gas supply pressure is correct
(Natural Gas 20mbar, and Propane 37mbar).
9. The pressure can be adjusted if required.
10. To check and set minimum pressure first remove
one of the modulator wires.
Adjusting the Pressure (Fig 39)
11. Remove the plastic protection cap from the
pressure adjustment nuts on the valve.
12. The smaller nut (5mm) adjusts minimum pressure
and the larger nut (8mm) maximum pressure.
J
13. Using a suitable spanner adjust the relevant nut
until the correct pressure is achieved.
14.
Once
the pressure has been set turn the boiler off
and disconnect
the pressure gauge.
15. Tighten the pressure test screw and refit the
modulator to the valve. Reassemble in reverse order.
Selector Switch
0
1IIJ.F
([50
°
. .F
pD
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Q
'
O
"
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.
h
=-~
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.
0
h
=
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". .:
.
.
Q=-',
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.
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.
.
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0C)
Central Heating
Temperature Control
Pressure Test Point
,
SealingScrew
Gas Valve
Fig. 38
Plastic
Protection
Cap
Maximum Rate
M
. .
Adjustment Nut
Inlmum Rate
Adjustment Nut
Fig. 39
NOTE: Gas Valve Electrical
Plug/Igniter not shown for clarity.
Fig. 37
Hot Water
Temperature Control
0
25
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