17
Eclipse RatioMatic Burners, RM Series, V5, Installation Guide 110, 12/3/2014
Procedure D: Bypass start gas
with
fuel orifice meter
Figure 4.13. Procedure D
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. Prepare to measure bypass gas flow at the fuel orifice
meter
.
5. Open manual shut off valve
in the bypass.
6. Set the system to operate on bypass gas only.
7. Attempt to ignite burner by energizing spark and
bypass gas solenoid valves
.
Figure 4.14. Adjusting Limiting Orifice (ALO)
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 ALO adjusting
screw
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.
9. Adjust bypass gas flow with ALO adjusting screw
to
achieve the low fire gas flow indicated on datasheet.
Refer to the fuel orifice meter literature for instructions
on flow measurement.
NOTE:
When firing into negative or fluctuating chamber
pressures, a higher bypass gas flow may be necessary.
10. Verify the bypass gas 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.
Step 4: Set Low Fire Gas (RM0050-RM0700
only)
(Only required if Bypass Start is Used)
■
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
Figure 4.15. Ratio Regulator
1. Verify bias adjusting screw
on ratio regulator spring
column in 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.
Main gas
shut-off
valve train
NC
NC
WARNING
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