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Info 140
11/4/03
ECLIPSE AIR HEAT BURNERS
Series “AH”, “DAH”, “TAH” & “CAH”
U.S. Reissue Pat. No. 26,244 Canadian Pat. No. 743,782
AH, Front View
AH, Back View
Data 140-1
Data 140-1
TAH
Data 140-3
CAH
Data 140-4
DAH, Blower Down
Data 140-2
WARNING
The burners covered in this Guide are designed to structions or application limits in this Guide without
mix fuel with air and burn the resulting mixture. All written advice from the Eclipse Combustion Division
fuel burning devices are capable of pro
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Important Notices About Safe Burner Operation Storage Store the burner inside. Exposure to the elements can damage the burner. Qualifications Adjustment, maintenance, and troubleshooting of the mechanical parts of this unit should be done by people with good mechanical aptitude and experience with combustion equipment. Replacement Parts Order replacement parts from Eclipse only. Any customer-supplied valves or switches should carry UL, FM, CSA, and/or CGA approval where applicable. Operator Trai
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Specifications Input: 1,000,000 Btu/hr. per lineal foot (962 kW/m). Fuels: Natural gas or 100% propane vapor. Call Eclipse for information on using other fu- els. Gas Turndown: 40:1 Pilot Input: Approximately 25,000 Btu/hr. (7.3 kW) Gas Inlet Pressure: 800,000 Btu/hr/ft. (769 kW/m): Nat. Gas: 2.2" w.c. 5.5 mbar Propane: 0.9" w.c. 2.2 mbar 1,000,000 Btu/hr/ft. (962 kW/m): Nat. Gas: 3.5" w.c. 8.7 mbar Propane: 1.3" w.c. 3.2 mbar Gas pressure shown is a differential measured between the gas inlet
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2.0 Control System Requirements Turndown Method Input is normally controlled by a motorized butterfly valve in the gas line to the burner. Regulator Loading Lines Connect the top diaphragm chambers of the main gas and pilot gas regulators to the duct approximately 10" downstream of the burner. This will allow the regulators to maintain a constant supply pressure to the burner regardless of varying pressures in the duct. Piloting Pilot gas flow is adjusted as shown in Figure 6. Ignition Ignition
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Figure 5–Mounting & Duct Lengths In-Duct Sealed Slot-Fired Duct Press: +0.2" to –0.5" w.c. Duct Press: 0" to –0.5" w.c. +0.5 to –1.2 mbar 0 to –1.2 mbar Min./Max. Velocity: 500 to 6000 fpm 2.54 to 30.48 m/s Optimum Velocity: 1000 to 4000 fpm 5.08 to 20.32 m/s Min./Max. Velocity: 500 to 1200 fpm Min./Max. Velocity: 500 to 1200 fpm 2.54 to 6.10 m/s 2.54 to 6.10 m/s Provide at least 3" (76 mm) clear- ance between burner and top, bot- tom and sides of the duct. Profile plates are not required
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3.0 Duct Design and Burner Mounting Duct Design See Figure 5 for typical mounting arrangements and duct designs. Support The mounting flange or brackets supplied with an AH burner are capable of sup- porting the weight of the burner and blower. The AH burner case itself is de- signed to support the weight of the blower, so the blower does not require inde- pendent support. Valve Train Support Support valve trains independently of the burner. Gas Piping Use flexible nipples to allow for thermal e
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4.0 Start-Up And Adjustment (cont’d.) Set Air Pressure Drop Measure the air pressure drop across the burner as shown in Figure 7. 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 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 s
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6.0 Trouble-Shooting Symptom Cause Check Remedy 1. Burner does not a) Air pressure switches a) Check pressures in a) Change pressure start initially. not making. duct at location of connections where switch connections. a more positive b) Faulty pressure b) Check electrical pressure is present. switches. portion of switch. 2. Burner kicks out a) Low gas pressure a) Check low pressure a) Reset shortly after start-up. switch set too high. switch setting. 3. Pilot will not ignite on a) Raw gas fed
