9.
LOW FIRE (PILOT START GAS AND AIR SETTINGS)
(Minimum Input Rate)
Set air butterfly valve to give approximately 15mm (0.6”) wg air pressure at inlet to burner (above
combustion chamber pressure/suction).
Slightly ‘crack’ open gas flow control valve.
Initiate start sequence, if burner fails to ignite, slightly increase gas flow at butterfly valve and reset
sequence controller and initiate a new start sequence repeating as many items as necessary to give a
smooth start. (The burner should not light with an ignition shock or noise – if this is the case the gas flow
rate is generally too high for a safe start-up).
N/B:
It is recommended that the start gas rate should never exceed 10% of burner rating or 25,000
kcal/h (100,000 Btu/h) whichever is the lower.
10.
FULL FIRE
With servomotor linkages disconnected and flame established manually increase flow rate of air and gas to
achieve required output. This will be FULL FIRE position.
N.B:
Always move air valve first on increasing flame and gas valve on decreasing flame size. It is
dangerous to produce gas rich flames.
Reconnect control linkages and drive motor and ensure they are free to travel over full firing range.
Check firing range and if necessary adjust characterisation of control valve system for best operation and
turndown required.
11. With burner firing ensure normal pressure connected air pressure switch is correctly set for burner
operation. It should be set to break electrical continuity if the air pressure setting fails.
12. Observe flame at different firing rates and re-check allied safety control and all process interlocks and
controls.
OPERATING INSTRUCTIONS
TO START
(Fully Automatic – Previously Commissioned System)
1. Open
PILOT GAS COCK
and
MAIN GAS COCK
.
2. Press
START
or
IGNITION BUTTON.
TO START
(Manual - Previously Commissioned System)
1. Make
sure
MAIN GAS COCK
is closed.
2. Make sure the burner firing rate is at predetermined low fire position.
3. Start any process circulating and exhaust fans.
4. Energise system control panel (if applicable).
5. Start
BURNER FAN BLOWER MOTOR
.
6. Press
IGNITION BUTTON
or apply external ignition source.
7. Open
MAIN GAS COCK
slowly until burner ignites.
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