Eclipse RatioAir v1 - Installation Guide No. 115, 4/7/06
1
Step3:
Ignite the burner
Procedure B:
Low fire start
with
high
turndown option.
Bias
adjusting
screw
CW for
more gas
CCW for
more gas
Internal bypass
adjusting screw
1
2
Ratio Regulator
(with internal bypass
adjusting screw)
Main gas
shut-off
valve train
Ratio regulator
with bypass
adjusting screw
Low fire start with high turndown option:
1.
Drive control motor to low fire.
2.
Be sure combustion air blower is running.
3.
Verify bias adjusting screw
1
on ratio-regulator spring column is six
full clockwise turns (360° x 6) down from top (initial setting).
4.
Open main gas manual shut off valves.
5.
Close internal bypass adjusting screw
2
by turning it clockwise to
closed position.
6.
Set system control to stay at low fire during and after ignition
sequence.
7.
Attempt to ignite burner.
8.
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 bias adjusting screw
1
a half
turn clockwise 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.
9.
After burner ignites, slowly decrease gas flow with bias adjusting
screw
1
. Decrease gas flow until the flame signal becomes erratic.
(Refer to flame monitoring relay literature for a description of an
erratic flame signal.)
10.
If burner has gone out:
Repeat ignition sequence. Turn internal bypass adjusting screw
2
a
half turn counterclockwise to increase gas flow at each attempt until
burner lights.
11.
Flame signal strength:
Adjust gas flow with internal bypass adjusting screw
2
for lowest gas
flow that maintains a stable flame signal:
• counterclockwise, for more fuel
• clockwise, for less fuel.
12.
Verify low fire 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.
