Sheet 4979-1 Page 3
CURTAIN SIZING PROCEDURE
HOW TO ORDER
1. Total burner area perpendicular to air flow (0.5 sq ft per lineal foot) = 0.5 ft of burner. Example: 0.5 3.0 = 1.5 sq ft.
1. Calculate required heat input. Example: 2 730 000 Btu/h HHV gross input (2730 cfh natural gas), 945 scfm make-up air, and 47 040 scfm recirculated. For this example, assume the avail- able gas pressure is 1 ½ psi. 2. Select individual burner sections to obtain this rating from Table 2. Each lineal foot of burner is rated at 1 000 000 Btu/h HHV. Include enough feed connections to supply rated volume of gas-- a 2" connection supplies 3 feet of burner; a 2 ½ " connection supplies 5 feet of burner , but should be centered to assure proper gas distribution. Example: The next largest burner input is 3 000 000 Btu/hr, which could be obtained by three 4979-12's.
2. Total open area required at burner = (scfm recirculated + scfm make-up) 3500 fpm. Example: (47 040 + 945) 3500 = 13.7 sq ft.
3. Curtain opening = total burner area (1) + open area (2). Ex- ample: 13.7 + 1.5 = 15.2 sq ft.
3. Select 8522 Fast Engineered™ fluid control system.
4. Select ignition method--either gas pilot (Assembly 4-5257-1) or direct spark electrode (Part No. 4-3681-1).
5. Select endplates--either for gas connection or blank. Example: Two 4979-SEP endplates. (From Table 2.)
Silhouette plate
B
C
TO OVEN
Make-up air and recirculated air from oven
A
Pilot gas
D
N
E
Main gas
L
J
Typical 4979 Oven installation includes items shown.
H
P
K
M
H G
F
A - 4979 Zephyr Burner
H - Shutoff Cock J - Test Cock K - Block Valve L - Vent Valve
B - Flame Detector
C - Pilot Adjusting Cock D - Pilot Accessories
E - High Gas Pressure Switch F - Gas Control Valve & Motor
M - 1518 or 1519 Automatic Shutoff Valve
N - Low Gas Pressure Switch P - Main Gas Pressure Regulator
G - Metering Orifice
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
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