4.0Start-Up And Adjustment (cont’d.)
Set Air Pressure Drop | Measure the air pressure drop across the burner as shown in Figure 7. |
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| Turn the disc on the blower air inlet until the air pressure drop is between 0.4" | |||||||||||||||
| w.c. minimum and 1.0" w.c. maximum. For a given input, lower air pressure |
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| drops will produce a longer flame, and higher drops will produce a shorter flame. | |||||||||||||||
| Large Burners Only: Some models, such as the 640, 680, and 720 TAH burn- | |||||||||||||||
| ers, contain a butterfly valve in the check valve line as shown in Figure 8. On | |||||||||||||||
| these models, after setting the air flow as described in the previous paragraph, | |||||||||||||||
| measure the air pressure drop between the gas pressure tap and duct as shown | |||||||||||||||
| in Figure 7. Gas flow must be off. Adjust the butterfly valve to produce an air |
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| pressure drop of 0.2" w.c. |
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Start Spark | Energize the ignition spark. Do not touch | Figure | ||||||||||||||
| the ignition rod, ignition wire, or trans- | in Check Valve Line | ||||||||||||||
| former while the spark is energized, or |
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| you will get a shock. |
| Butterfly Valve On |
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Set Pilot Flow | Open all pilot gas valves, including the | 640, 680 & 720 |
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| Check | ||||||||
| TAH Burners | |||||||||||||||
| Valve | |||||||||||||||
| handle of the pilot cock, Figure 6. The pilot |
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| should light. |
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| Turn the pilot adjusting screw to produce a |
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| bushy blue flame that provides a flame |
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| monitoring signal strong enough to reliably |
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Set Gas Flow | open the gas |
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Measure the gas differential pressure as |
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| shown in Figure 7. |
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| With the gas control valve at low fire, open |
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| all main gas valves. The burner should |
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| light with a stable, blue low fire flame that extends evenly down the burner |
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| length. |
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| Drive the control valve to high fire and adjust the gas adjusting valve to produce | |||||||||||||||
| a pressure drop that corresponds to the desired high fire rate, as shown in Fig. 1. | |||||||||||||||
| When setting high fire, be sure the flame does not impinge on anything down- | |||||||||||||||
| stream of the burner. To shorten the flame length for a given gas input, increase | |||||||||||||||
| the air pressure drop as described above. |
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Check All Settings | Return the burner to low fire and check to be sure that the burner remains lit with | |||||||||||||||
| a stable flame that extends down the burner length. Cycle the burner between | |||||||||||||||
| low and high fire several times, checking pressure drops and flame lengths. |
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5.0Routine Maintenance
Motor Lubrication | Oil the blower motor according to the manufacturer’s instructions as printed on |
| the motor label. |
Ignition Plug/Flame Rod | Ignition plugs and flame rods wear out over long periods of normal burner opera- |
| tion. Eclipse recommends that the user keep at least one of each in stock at all |
| times to prevent nuisance shutdowns. |
Eclipse AirHeat v1.0 - Installation Guide No. 140, 11/4/03 | 7 |
