Glow-worm Betacom C - Manual (Page 40)

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Diagram 11.5
11.5 Setting Operational Pressure
Minimum setting
Remove the sensing tube from the gas valve.
Remove one lead from the modulating gas valve coil, see
diagram 11.6.
Refer to diagram 11.7.
Connect a suitable pressure gauge the pressure outlet of the
gas valve.
Turn the boiler’s function switch to the ‘Winter’ position.
(Heating and Hot Water), see diagram 11.4
Turn the central heating temperature control to maximum
setting.
Remove the protective cover from the gas valve adjuster.
Turn the inner screw using a screwdriver, clockwise: to
increase the pressure setting, anticlockwise: to decrease the
pressure setting.
After correct adjustment see, ‘Boiler specification section’
page 8, re-connect the electrical connector and protective
cover and replace the sensing tube to the boiler.
Maximum setting
Remove the sensing tube from the gas valve, see diagram
11.5.
Remove the protective cover from the gas valve adjuster.
Push the ball inside the modulating gas valve coil using a
sharp pointed tool.
Turn the nut with a 10mm spanner (keeping the ball in without
any rotation) clockwise: to increase the pressure setting,
anticlockwise: to decrease the pressure setting.
After correct adjustment see, ‘Boiler specification section’
page 8.
Finally, replace the sensing tube to the gas valve.
ELECTRICAL
AND EARTH
CONNECTIONS
ELECTRICAL
PLUG
SCREW
SENSING TUBE
MODULATING
COIL
GAS VALVE AND
MANIFOLD INLET
CONNECTIONS
Diagram 11.6
15524
GAS VALVE
ADJUSTER
11 Commissioning