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5.3.
Checking Gas Pressure
5.3.1.
To check the gas supply pressure:
5.3.1.1. Unscrew the sealing screw (2 turns) of the control valve test nipple marked 'IN' and connect a manometer to this
test nipple.
5.3.1.2. Ignite the appliance burner by switching on the electrical supply to the appliance and check that the
manometer reading is as stated below, for the gas type the appliance is adjusted for (see Data Label affixed to
the appliance reflector, below the control valve).
Category 2H: gas type G20 (natural): supply pressure
20mbar (nom)
17mbar (min)
25mbar (max)
Category 3P: gas type G31 (propane): supply pressure
37mbar (nom)
25mbar (min)
45mbar (max)
5.3.1.3. Switch off the electrical supply to the appliance and remove the manometer tube from the Control Valve test
nipple marked 'IN'. Screw in the test nipple sealing screw.
5 3.2.
To check the burner setting pressure: -
5 3.2.1. Unscrew the sealing screw (2 turns) of the Control Valve test nipple marked 'OUT' and connect a manometer
to this test nipple.
5 3.2.2.
Ignite the burner by switching on the electrical supply to the appliance and check that the manometer reading
is as stated below, for the gas type the appliance is adjusted for (see Data Label, affixed to the appliance
reflector, below the Control Valve.
Category 2H: gas type G20 (natural): setting pressure - 15.0mbar.
Category 3P: gas type G31 (propane): setting pressure - 25.0mbar.
5.3.2.3. In the event that the burner setting pressure is incorrect, remove the cap from the integral pressure governor
of the control valve. Adjust the pressure (using a suitable screwdriver) by turning the pressure governor
adjusting screw clockwise to increase, or anti-clockwise to decrease the burner setting pressure.
5 3.2.4. Upon obtaining the correct burner setting pressure, switch off the electrical supply to the appliance, remove
the manometer tube from the control valve test nipple marked 'OUT' and screw in the test nipple sealing
screw. Replace the cap on the integral pressure governor of the control valve and seal by applying red
enamel paint to the joint between cap and governor housing.
5.4
Flame Supervision
.
5.4.1.
To check the operation of the flame supervision equipment, run the appliance normally, remove the flame
sensor (grey) lead from the ignition control by gently pulling the connector using insulated pliers. Observe that
the burner flame is extinguished within 1 second.
5 4.2.
After a 'waiting time' of 1 second, the solenoid valves and the ignition spark electrode will be re-energised and
with the flame sensor lead still disconnected, the Ignition Control will go to 'lockout condition' after a further 25
seconds (Honeywell Control) or 10 seconds (S.I.T. Control).