Step 3: Ignite The Burners - Eclipse ExtensoJet EJ025 Installation Manual

Step 2: Set High Fire Air
(Continued)
Tap C
Tap A
Manometer
Step 3: Ignite the Burners
Eclipse ExtensoJet v2 Installation Guide No. 230, 9/17/2008
Note:
A pressure tap is open when the screw inside the tap is
unscrewed approximately half a turn.
Single Burner System:
a. Make sure that pressure taps A and C of the burner are
open.
b. Connect the manometer to taps A and C (across the air
orifice).
c. Adjust the manual butterfly valve until the high-fire
differential air pressure is at the target value.
d. Remove the manometer.
e. Close the pressure taps.
Multiple Burner System:
a. Make sure that pressure taps A and C of the first burner are
open.
b. Connect the manometer to taps A and C of the first burner
(across the air orifice).
c. Adjust the manual butterfly valve for the zone, until the
high-fire differential air pressure is at the target value for the
first burner.
d. Measure the differential air pressure across the next burner
in the zone.
e. Repeat step d for all the other burners in the zone (if any).
f. If all the measured differential pressures are within 0.3" w.c
(0.75 mbar) of each other, then proceed to the next section.
If the variation is greater than 0.3"w.c. (0.75 mbar) it will be
necessary to adjust the manual air butterfly valve at each
burner to improve the balance.
g. Make sure that all the pressure taps are closed.
4. Repeat 3 for other zones (if any).
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)".
1. Drive the zone gas automatic butterfly valve to low fire.
2. Make sure the combustion air blower is running.
3. Set the burner manual gas butterfly valve to low fire.
4. Set the adjusting screw on the ratio regulator six full (360°)
turns down from the top (initial setting).
5. Select the valve according to the control method:
a. With high/low control:
Set the gas bypass butterfly valve 25% open.
b. With modulating gas control:
Set the zone gas automatic butterfly value to
approximately 10% open. Stroke the valve to the open
position to ensure 100% open. Readjust if necessary.
6. Open the zone gas manual gas cock.
7. Open the manual gas cock at each burner.
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