Installation guide

Eclipse RatioMatic v3.10 - Installation Guide No. 110, 7/1/03
20
Low fire start without high turndown option:
Main gas
shut-off
valve train
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 the
top (initial setting).
4. Open main gas manual shut off valves.
5. Set system control to stay at low fire during and after
ignition sequence.
6. Attempt to ignite burner.
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 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.
8. 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.
Note:
If viewing the flame, it should be blue with flashes of yellow.
The flame should be completely within the combustion tube.
When firing propane or butane, a proper low fire flame may
have sustained flashes of yellow.
9. 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.
Ratio Regulator
Step3: Ignite the burner
Procedure A:
Low fire start without high
turndown option.
Bias
Adjusting
Screw
CW for
more gas