Step 6: Set High Fire Gas - Eclipse TFB030 Installation Manual

5. Open the zone manual gas cock.
6. Start ignition transformer.
■ Do not touch the spark rod or the ignition wire
when the ignition is on. You will get a shock.
7. While viewing down the peepsight, open the gas cock
at burner. Burner should ignite.
8. If burner does not ignite within 15 seconds (verify with
local codes), close gas cock and purge with air.
Repeat steps 6 - 8 without any adjustment to ensure
all air is purged from the gas piping.
9. If burner still does not ignite adjust an additional turn
down on ratio regulator.
10. Repeat steps 6 - 9 if necessary.
11. Repeat steps 6 - 10 for all other burners in the zone.
Automatic Ignition Steps:
1. Drive the zone air automatic control valve to low fire.
2. Make sure the combustion air blower is running.
3. Set the manual gas butterfly valve at each burner to
50% open. See Figure 4.3.
4. Set the adjusting screw on the ratio regulator 6 full
rotations of 360° down from the top (initial setting).
5. Open the zone manual gas cock.
6. Open the manual gas cock at each burner.
7. Initiate the ignition sequence through the flame
monitoring system.
8. Check that all the burners in the zone have ignited.
• If a gas solenoid valve is fitted at each burner, then
repeat step 7 for all burners in the zone.
• If burners do not light, purge with air and adjust an
additional turn down on the ratio regulator. Repeat
step 7.
NOTE: Initially it may be necessary to repeat step 7
two or three times to purge all the air out of the gas
pipework.
9. If all the burners have ignited, then drive the zone air
butterfly valve to high fire. Make sure that the burners
stay ignited.

Step 6: Set High Fire Gas

1. Use the gas curves on the appropriate datasheet to
find the gas pressure differential needed at high fire.
This is the target value for high fire.
NOTE: A pressure tap is open when the screw inside
the tap is unscrewed approximately half a turn.
14
DANGER
Figure 4.5. Set High Fire Gas
2. Make sure that pressure tap C and pressure tap D of
the burner are open (open the internal screw 1/2 turn).
3. Connect the manometer to tap C and tap D of the
burner (across the gas orifice).
4. Measure the high fire gas pressure drop for the first
burner.
5. Adjust the manual gas butterfly valve at the burner
until the gas flow is at the target value.
6. Repeat step 4 and step 5 for the other burners in the
zone (if any).
7. Check the gas pressure at the inlet to the zone ratio
regulator. This should be at least 5" w.c. higher than
the loading line pressure. It should not exceed the
maximum pressure rating of the ratio regulator.
8. Measure the oxygen level in the exhaust, using an
oxygen analyzer.
9. If the O level is between 2.5% and 4%, the level is
2
correct. If not, adjust the manual gas butterfly valve
until you have the appropriate level.
10. Repeat steps 2 through step 9 for the other burners.
11. For each burner, connect the manometer across
pressure taps C and D and measure the pressure
drop.
• If all pressure drops are at or below the target value,
then the settings are correct.
• If necessary, adjust the manual zone air butterfly
valve to obtain the target value.
12. Verify settings when the furnace is at operating
temperature.
■ Make sure that all the pressure taps are closed.
Eclipse TFB, V2, Installation Guide 310, 11/14/2014
CAUTION