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Step 5:
Ignite the Burners
Step 6:
Set High Fire Gas
Tap B
Manometer
Eclipse ExtensoJet v2 Installation Guide No. 230, 9/17/2008
Warning:
This procedure assumes that a flame monitoring
control system is installed and is serviceable. It also
assumes that normal low fire start is being used. If
low fire gas is too low to be used for ignition, refer
to options in "Set the bypass pilot gas (optional)" on
page 21.
1.
Drive the zone air automatic control valve to low fire.
2.
Make sure the combustion air blower is running.
3.
Set the manual gas butterfly valve at each burner to 50%
open.
4.
Set the adjusting screw on the ratio regulator six full (360°)
turns down from the top (initial setting).
5.
Open zone manual gas cock.
6.
Open manual gas cock at each burner.
7.
Initiate the ignition sequence through the flame monitoring
control system.
a.
Check that all the burners in the zone have ignited.
b.
If safety shut-off solenoid valves are installed at each
burner, then repeat 6 and 7 for all the burners in the zone.
8.
If all the burners have ignited, drive the zone air butterfly valve
to high fire. Verify flame is present at each burner. If burners
do not light, add a 1/2 turn down on the proportionator, repeat
steps 7 through 11.
9.
Verify that air pressure drops have remained the same.
10.
If air pressure drop is too high, close down the zone manual
air butterfly valve.
11.
If air pressure drop is too low, open the zone manual air
butterfly valve.
1.
Use the gas curve from the appropriate ExtensoJet Datasheet
for the gas being used to find the differential gas pressure
needed at high fire. This is the target value for high fire.
2.
Connect the manometer to taps B and D (across the gas
orifice).
3.
Measure the high fire differential gas pressure for the first
burner.
4.
Adjust the gas butterfly valve at the burner until the gas flow is
at the target value.
Tap D
5.
Repeat 3 thru 4 for the other burners in the zone.
6.
Check the gas pressure at the inlet to the zone ratio
regulator. This should be at least 5" w.c. (12.5 mbar) higher
than the loading line pressure. It should not exceed the
maximum pressure rating of the ratio regulator.
Warning:
Insufficient gas inlet pressure may cause the
proportionator to remain fully open as the burner
system turns down from high fire, causing excess fuel
operation and the possible accumulation of unburned
fuel in the chamber. In extreme cases, this may cause
explosions or fires.
17
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Troubleshooting
