Capacities and Ordering Information | 4988 Zephyr™
Table 1. CAPACITIES
Flame
Burner
millions of motor hp and rpm blower volume lengths at
"H" cfh at 1"wc P
1"wc P
designation
Btu/hr
"L"
4988-1000 4988-2500 4988-4000 4988-6000 4988-9000
1.0 2.5 4.0 6.0 9.0
1⁄3 -3450
1 /
2 -3450
16 200 40 800 64 800 96 000 123 000
30" 36" 48" 60" 78"
1 -3450 2-3450
1 -1725 1 ½ -1725 3 -3450
3 -3450 3 -3450
—
"L" blowers develop 1"w.c. air pressure at burner. "H" models develop 4.5"w.c. at burner. Motors are 230-460/3/60, except 115/1/60 is an option for -1000 burners.
Temperature Effect. Burner performance may change as oven air temperature rises from start-up to operating levels. Effect is most marked at elevated temperatures, but burner operation should be checked at all temperatures. Table 2 indicates how fan pressure changes with temperature. Altitude also affects blower capacity and pressure. Above 5000 feet, larger motors are usually required-- consult North American.
When selecting burners, make sure pressure drop between burner and process is within the stability ranges of Table 3 at all temperatures and all firing rates.
Table 2. Effect of air temperature on pressure developed by a recirculating fan. temperature factor temperature factor 60°F 1.00 600°F 0.49 100°F 0.93 700°F 0.45 150°F 0.85 800°F 0.42 200°F 0.79 900°F 0.38 300°F 0.68 1000°F 0.36 400°F 0.60 1100°F 0.33 500°F 0.54 1200°F 0.31
Table 3. Flame stability ranges.
air pressure drop, "w.c. 4988- -L, H, or R minimum maximum 1000 0.25 4.0 2500 0.50 3.0 4000 0.25 3.0 6000 0.25 2.5 9000 0.50 2.5
ORDERING INFORMATION
4988 -
-
Burner Size Input Btu/h HHV 1000 = 1,000,000 2500 = 2,500,000 4000 = 4,000,000 6000 = 6,000,000 9000 = 9,000,000 (-L only)
Fuel Type Blank = Natural Gas P = Propane B = Butane
Blower Type L = Low Pressure Blower H = High Pressure Blower R = Remote Blower Connection
To order, specify: 4988-(capacity designation)-any modifiers (L = low pressure fan, H = high pressure fan, R = remote blower, P or B = no charge modification for propane or butane--not required on -9000) electrical characteristics for burner blower motor. Examples: 4988-1000-L Low Pressure Burner complete 230-460/3/60 4988-6000-HP High Pressure Burner complete for Propane 230-460/3/60 Bulletin 4988 Page 6
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