Supplement 4987 Page 3
DESIGN OPERATING RANGE
NOT RECOMMENDED
Fuel Input (Btu/hr) Air Capacity (cfh)
Burner min.
max.
min. max.
500 10 000 500 000 1000 20 000 1 000 000
2 500 14 000
5 000 28 000 2500 50 000 2 500 000 12 500 70 000
Figure 1. Zephyr Operating Range.
Air Adjustment and Indicator
The Zephyr™ is an integral-fan gas burner used for air heating, baking, curing and drying. It is best suited for direct fire, air heating processes 1200°F or less. Fuel type (natural gas, propane, or butane) and control of fuel and air are speci- fied burner options that are selected when ordering. Fuel flow control is either integral to the burner (as shown in Figure 2) or provided separately as part of the fuel train. Control of air flow is either manual or automatic (via. linkage internal to the burner). The Zephyr is not intended to fire on-ratio for boilers or fluid heaters. It fires typically at 60% excess air or higher.
Fuel Control on Burner (optional)
Table 1. Fuel Capacity (maximum turndown 50:1) Burner firing natural gas and 1" P air pressure
Model
Fuel Flow (Pressure)
Flame Length
Figure 2.
Fuel control separate from burner 501
500 cfh (6.5"w.c.) 1000 cfh (2.5"w.c.) 2500 cfh (3.5"w.c.)
22" 26" 32" 22" 26" 32"
1001 2501
Standard blower motors are 230/460 V, 3 phase, 60 Hz. Fractional motors are available in 115 V, single phase, 60 Hz, as an option. Disposable or washable blower filters are available as accessories.
Fuel control on burner (valve open 100%) 502, 503 500 cfh (6.5"w.c.)
1002, 1003 2502, 2503
1000 cfh (5.5"w.c.) 2500 cfh (6.5"w.c.)
Flame Rod (or UV)
For propane and butane burners, the required fuel pressures listed above must be corrected for density. Propane is roughly 2.5 times denser and butane 3.3 times denser than natural gas. For equal Btu/h HHV capacity, the required fuel pressure would be 2.5 or 3.3 times less for propane and butane, respectively.
Spark Cable Igniter
Blower Motor
Air Taps ( 1 /
4 " NPT)
Table 2. Air Capacity (nominal rate at 1" P air pressure) P measured with burner firing in open
–+
Filter (optional)
Max. Flow P
in. cfh Min. Flow P
Nominal cfh
Model
Motor hp
cfh in.
500-L 500-H 1000-L 1000-H 2500-L 2500-H
0.3 0.5 0.3 0.5 1.0 2.0
8 000 8 000 16 000 16 000 40 000 40 000
9 800 14 300 18 200 22 600 45 600 71 600
1.5
2 500 0.1 2 500 0.1 5 100 0.1 5 100 0.1 12 700 0.1 12 700 0.1
Fuel Valve Shaft (optional)
3.2 1.3 2.0 1.3 3.2
Access Cover
Air Damper Dial/Indicator
rotation
C O
Differential air pressure ( P) listed above is a measurement across the burner flame holder. An air pressure tap is provided near the discharge (see Figure 3) and serves as the upstream reference. The downstream reference is the process stream, or duct, that the burner discharges into. This discharge stream is either positive or negative, and must be considered in estimating burner air flow. Zeph- yrs most commonly fire into negative, or suction, process streams. The -L blower version is recommended for these instances. For process streams having positive pressure (up to 3.5"w.c.), the -H blower version is recommended.
Burner Air Pressure Tap ( 1⁄8 " NPT)
Fuel Pressure Tap ( 1⁄8 " NPT)
Fuel Input
Guard
Figure 3.
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