Eclipse RatioAir v1 - Installation Guide No. 115, 4/7/06
Adjustable Limiting Orifice
(ALO)
Step3:
Ignite the burner
Procedure C:
Bypass start gas
without
fuel
orifice meter.
1 2
3
ALO
Adjusting
Screw
CCW for
more gas
Cap
3
Main gas
shut-off
valve train
NC
NC
Bypass start gas without fuel orifice meter:
1.
Drive control motor to low fire.
2.
Be sure combustion air blower is running.
3.
Be sure main gas manual shut off valves are closed.
4.
Open manual shut off valve
1
in the bypass.
5.
Set the system to operate on bypass gas only.
6.
Attempt to ignite burner by energizing spark and bypass gas
solenoid valves
2
.
7.
If burner does not ignite:
a.
Attempt to ignite burner again to purge air from the gas
piping.
b.
If burner still does not ignite, turn ALO adjusting screw
3
a half turn counterclockwise to increase gas flow.
c.
Attempt to ignite burner.
d.
Repeat steps
b
and
c
until burner ignites. If necessary,
refer to Chapter 5 for troubleshooting tips.
8.
Flame signal strength:
Adjust bypass gas flow with ALO adjusting screw
3
for
lowest gas flow that maintains a stable flame signal:
• counterclockwise, for more fuel
• clockwise, for less fuel.
9.
Verify bypass flame:
a.
Shut off gas. When chamber temperature is below
250°F (121°C), shut off combustion air blower.
b.
Restart combustion air blower and ignite burner.
c.
Verify repeatability of ignition and low fire flame signal.
