Eclipse ThermJet Burners for Preheated Combustion Air - Power ...

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Step 2: ControlMethodology (continued)Figure 3.1➊Modulating gas & air.On-ratio control or excess air @ low fireEductor FlowControl ValveHeatExchanger/Eductorto other BurnersFurnace pressure controlfixed at start up.Single diaphragm ratio regulator.Main gasshut-offvalve trainManualCombustionAir ControlValve➋RatioRegulatorAutomaticshut-off byzone or by burnerNCNC➌to other Burners➊Eductor FlowControl ValveHeatExchanger/Eductorto other BurnersFurnace pressure controlfixed at start up.Double diaphragm ratio regulator.Main gasshut-offvalve trainManualCombustionAir ControlValve➋RatioRegulatorAutomaticshut-off byzone or by burnerNCNC➌to other Burners➊HeatExchanger/Eductorto other BurnersAutomatic Furnace pressure control.Double diaphragm ratio regulator.Main gasshut-offvalve train➋RatioRegulatorAutomaticshut-off byzone or by burnerNCNC➌to other BurnersHeatExchanger➊to other BurnersAutomatic Furnace pressure control.Electronic mass ratio control.CAutomaticshut-off byzone or by burnerNCMain gasshut-offvalve trainCNC➌to other Burners12 Eclipse ThermJet PCA Design Guide No. 206, 3/5/07
Step 3: Ignition SystemFor the ignition system use:• 6,000 VAC transformer• Full-wave spark transformer• One transformer per burnerDO NOT USE:• 10,000 VAC transformer• Twin outlet transformer• Distributor type transformer• Half-wave transformerIt is recommended that low fire start be used. However, ThermJetPCA burners are capable of direct spark ignition anywherewithin the specified ignition zone (see Data Sheets 206-1through 206-13).Note:You must follow the control circuits described in the previous section,“Control Methodology,” to obtain reliable ignition.Local safety and insurance require limits on the maximum trialfor ignition time. These time limits vary from country to country.The time it takes for a burner to ignite depends on:• The distance between the gas shut-off valve and the burner• The air/gas ratio• The gas flow at start conditionsIt is possible to have the low fire too low to ignite within thetrial for ignition period. Under these circumstances you mustconsider the following options:•••Start at higher input levels.Resize and/or relocate the gas controls.Use bypass start gas. (See page 14)Bypass start gas (optional)A bypass start gas circuit provides gas flow around zone gasconrol valves during the trial for ignition period. This shouldonly be used if excess air is being used on low fire; it shouldNOT be used with on-ratio low fire systems. During the trialfor ignition period, the solenoid valve in the bypass line plusthe automatic gas shut-off valve (either at each burner or eachzone) are opened. If a flame is established, the bypass solenoidvalve closes at the end of the trial for ignition period. If a flameis not established, then the bypass solenoid valve and the automaticgas shut-off valve close.(See page 14 for bypass start gas circuit schematic)Eclipse ThermJet PCA Design Guide No. 206, 3/5/0713
Page 1 and 2: Design Guide 2063/5/07Eclipse Therm
Page 4: DocumentConventionsThere are severa
Page 7 and 8: Safety2IntroductionSafetyImportant
Page 9 and 10: System Design3DesignDesign structur
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Page 15 and 16: Step 5: CombustionAir System: Blowe
Page 17 and 18: Example BlowerCalculation(Continued
Page 19 and 20: AppendixConversionFactorsMetric to
Page 21: Key to System Schematics (Continued

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