Step 4 Set High Fire Gas - Eclipse TA Series Installation Manual

Step 4: Set high fire gas
Tap "D"
Tap "B"
0
If the burner has ignited:
a) Adjust the bypass flow adjusting valve such that the
burner is able to maintain a stable flame and an adequate
flame signal.
b) Open all remaining manual gas valves feeding the burner.
1. If the burner has and is ignited, drive the main gas control
valve to high fire (full open).
2. Verify air flow with the burner firing, repeat Step 2 "Verify air
flow".
3. Make sure that pressure taps B and D are open.
4. Connect the manometer to taps B and D.
5. Measure the gas differential pressure.
6. Use the gas curve from the appropriate ThermAir Data
Sheet for the gas being used to find the differential gas
pressure needed at high fire.
Note:
Select the appropriate gas orifice differential pressure based
upon the desired amount of excess air in the burner.
7. Readjust the control valve linkage to achieve the desired high
fire gas flow.
Note:
The ThermAir gas orifice is sized to limit high fire gas flow
to approximately 15% excess air with a packaged burner
assembly purchased with a ratio-regulator and gas control
valve.
8. Once the chamber conditions stabilize, (i.e. pressure and
temperature), repeat items 2 through 7.
9. Check the gas pressure at the inlet to the ratio regulator.
This should be at least 15"w.c. (37.5 mbar) It should not
exceed the maximum pressure rating of the ratio regulator.
Warning:
Insufficient gas inlet pressure may cause the ratio
regulator to remain fully open if there is a loss
of air flow to the burner. This can cause excess
fuel operation and the possible accumulation of
unburned fuel in the chamber.
In extreme cases, this may cause explosions or
fires.
Eclipse ThermAir T/A Series v1.10, Installation Guide No. 114, 4/7/06