Eclipse RatioAir v1 - Installation Guide No. 115, 4/7/06
Step 4:
Set low fire gas
(Only required if bypass start
is used.)
Bias
Adjusting
Screw
CW for
more gas
Ratio Regulator
Set low fire gas procedure:
Warning:
This procedure is written with the assumption
the burner has a flame monitoring control
system installed and operating. A proper purge
cycle must be part of the system control and
purge timing should not be bypassed.
This step is only necessary when bypass start gas is used.
Determine the piping method (low fire or bypass) and ratio
regulator installed (standard or high turndown), and proceed
with the applicable procedure:
Bypass start gas with standard turndown ratio regulator:
1.
Verify bias adjusting screw
1
on ratio regulator spring
column is six full clockwise turns (360° x 6) down from the
top (initial setting).
2.
Open all manual gas shut off valves.
3.
Set system control to stay at low fire during and after
ignition sequence.
4.
Ignite the burner.
5.
If burner goes out due to main gas flame failure:
Turn bias adjusting screw
1
a half turn clockwise to
increase gas flow. Repeat ignition sequence until burner
lights.
6.
Flame signal strength:
Adjust gas flow with bias adjusting screw
1
for lowest gas
flow that maintains a stable flame signal:
• clockwise, for more fuel
• counterclockwise, for less fuel
7.
Verify low fire flame .
a.
Drive control motor from low fire and back. Verify low
fire and stable flame signal are repeated.
b.
Turn the burner off and repeat the ignition sequence.
Verify low fire and stable flame signal are repeated.