14
Eclipse ThermJet Self-Recuperative, V5, Installation Guide 208, 2/4/2013
5. Open zone manual gas cock. (Multi-burner systems
only.)
6. Open manual gas cock at each burner.
7. Initiate the ignition sequence through the flame
monitoring control system.
a.Check that all the burners in the zone have ignited.
b.If safety shut-off solenoid valves are installed at
each burner, then repeat steps 6 and 7 for all the
burners in the zone.
8. If all the burners have ignited, proceed to step 9. If
burners do not light, repeat step 7.
9. Drive the system to high fire and back down to low
fire, ensure the burners are still ignited.
10. If necessary, readjust the air pressure drop between
taps A and C until it matches the value in the
appropriate datasheet.
Step 7: Set High Fire Gas
1. Drive the system to high fire, ensure that all the
burners are ignited.
2. Check air pressures. With the burners firing check the
air pressure at the burners as described previously.
3. Use the gas curve from the appropriate ThermJet
Self-Recuperative datasheet for the gas being used to
find the differential gas pressure needed at high fire.
This is the target value for high fire.
4. Connect the manometer to taps B and D (across the
gas orifice).
5. Measure the high fire differential gas pressure for the
first burner.
6. Adjust the gas butterfly valve at the burner until the
gas flow is at the target value.
7. Repeat steps 3 through 4 for the other burners in the
zone.
8. Check the gas pressure at the inlet to the zone ratio
regulator. This should be at least 5" w.c. (12.5 mbar)
higher than the loading line pressure. It should not
exceed the maximum pressure rating of the ratio
regulator.
■
Insufficient gas inlet pressure may cause the
proportionator to remain fully open as the burner
system turns down from high fire, causing excess
fuel operation and the possible accumulation of
unburned fuel in the chamber. In extreme cases,
this may cause explosions or fire.
9. When the furnace is at operating temperature, the air
pressures should be checked at high fire.
• Check the air differential pressure tap A to C. If
necessary, adjust the valve to achieve the desired
pressure. On multi-burner systems, check the
differential pressure A to C on all burners. If the
difference in pressure is greater than 0.5" w.c. (1.25
mbar) it will be necessary to adjust the air balance
using the valve.
• Check the differential gas pressure tap B to D at
each burner, if necessary adjust gas flow using
valve to achieve the required pressure.
If possible the O
2
level in the exhaust should be
checked. It must be noted that on multi-burner
installations the O
2
reading obtained at an individual
burner is influenced by other burners in the zone and
by any ingress of fresh air into the furnace.
The O
2
level measured will provide a measurement of
the general free oxygen in the furnace and should not
be used to set the air/gas ratio on the individual
burners.
On single burner installations O
2
reading will only be
influenced by the ingress of fresh air and can be used
to set the air/gas ratio with more confidence.
To measure the O
2
accurately, the probe must be
inserted into the exhaust at the side of the
recuperator.
NOTE:
Increased O
2
level in the burner system lowers the
efficiency of the system. For additional information on
taking O
2
readings on the TJSR please contact Eclipse.
Step 8: Set Low Fire Gas
1. Drive the system to low fire.
2. Verify the burner lights reliably at low fire and has a
good flame signal. Monitor the furnace’s ability to hold
temperatures as desired and adjust accordingly.
NOTE:
Turndown can be increased by turning the ratio
regulator adjusting screw counterclockwise.
NOTE:
It may be necessary to rely on visual inspection.
This is especially true when gas turndowns in excess of
10 to 1 are being used. The main intent is to provide a
clean stable flame with a good flame signal that will not
cause the furnace temperature to overshoot the set point.
Step 9: Verify the Gas Settings
Make sure that all settings are still the same after cycling
the system several times between high and low fire.
NOTE:
When all the settings have been completed, mark
the position of the indicator on the butterfly valves to
indicate valve position.
WARNING
