Series "NP" & "RG" AIRFLO Burners Page 5505 Performance Selection Data Operation in shaded area requires special considerations Optimum Design Area Operation in shaded area requires special considerations Optimum Design Area 9/03
Page 5506 Series "NP" & "RG" AIRFLO Burners Performance Selection Data (cont'd.) Optimum Design Area Airstream velocity across and through your burner's mixing plates must be kept uniform and within desired limits by use of a silhouette profile plate through which the burner fires. A 6" (minimum) profile plate should be installed surrounding the interior duct walls at the leading edge of your burners mixing plates. Optimum design ranges for the various burner types are shown in the above graphs. Velocities (SFPM) are measured with a velometer directly in the duct at the plane of the profile plate and leading edge of burner mixing plates. To determine profile opening areas, add burner displacement areas (Ft 2 /section) from Table 1 for your complete burner assembly to "Net Free Area" of your duct: "Net Free Area" of Duct (Ft 2 ) = Fan Volume (SCFM) Velocity (SFPM) Net Free Area (Ft 2 ) + Burner Displacement (Ft 2 ) = Profile Area (Ft 2 ) Various duct size/profile area relationships may give slightly different field site data than is shown in Table 2. Velocities should always be confirmed and established by use of a velometer on actual field site installation. Table 1: Velocity Factors Table 1: Burner Section Displacement 2 ( ft /section) Inlet Feed Limitations: NP-I NP-II NP-III RG-IV 1-1/4" end 4' 4' 2000 4' inlet flange KBtu/hr 1-1/2" back 5' 5' 4500 5' inlets* KBtu/hr *Note: For 36 back inlet sections, not more than 6" off any one leg Pilot Capacities: Nominally rated at 25,000 Btu/hr with natural gas differential pressures of 4-6" w.c. Desired velocity across burner at profile plate opening (SFPM) 1600 1800 2000 2200 2400 2600 2800 3000 3250 3500 3750 4000 4500 5000 Appoximate velocity pressure reading at profile plate ("wc) 0.16 0.20 0.25 0.30 0.36 0.42 0.49 0.57 0.64 0.77 0.88 1.00 1.26 1.55 NP RG 6" Straight 0.25 0.33 12" Straight 0.50 0.66 18" Straight 0.75 0.99 24" Straight 1.00 1.32 12" Back Inlet 0.50 0.66 36" Back Inlet 1.20 1.50 12" x 6" Tee 0.60 0.75 6" x 6" Elbow 0.45 0.60
Series "NP" AIRFLO Burners Page 5507 Approximate Envelope Dimensions (Nominal, in Inches) Burner Sections (All burners shown are available in NP-I, II or III versions. Use one of these numbers (I, II or III) in place of asterisk (*) in burner designation when ordering.) NP- * -6 6" Straight or 6"P Pilot NP- * -12 or NP- * -12B 12" Straight or 12B Back Inlet NP- * -18 18" Straight NP- * -24 24" Straight NP- * -L 6" X 6" Elbow NP- * -T 12" X 6" Tee NP- * -36B 36B Back Inlet Typical End View 4/95
Page 5508 Series "NP" AIRFLO Burners Pilots, End Closures, and End Inlet Flange Sets NOTE: All open ends of burner assembly must be closed off with one of these end closures or pilots. One-piece cast end closures should not be used if temperature rise exceeds 300 F. Plain End Closure Sets End Inlet & Pilot Flange Sets NP-EC (1 pc) End Closure Set Pilot End Plate Sets NP-EP (2 pc) End Plate Set NPF- 1-1/4" -FR-SI (1 pc) Pilot Set w/si NPF- 1-1/4"- EP (2 pc) End Inlet Flange Set NPF- 1-1/4"- FR-SI (2 pc) Pilot Set w/si NP-Pak Pilot Set w/si NP-Pak Pilot Set w/adj. Orifice/SI Common Dimensions (Nominal, in Inches) Typical End View NP-Pak Pilot Set w/orifice/cock/tube/ SI NP-EC-SI-3/4"UV (1 pc) Pilot Set w/ SI NP-EC-SI-1/2"-FR (1 pc) End Closure Set w/si Pilot Assembly Section NP-6P Pilot Section w/built-in Pilot includes end plate pilot w/si onto its own special 6" Series NP AIRFLO Burner assembly PIpe threads on this page conform to NPT (ANSI Standard B2.1) Legend: 1-1/8" test connection 2-1/4" pilot gas connection 3-14mm spark ignitor connection 4-1/2" or 3/4" UV/FR connection bushed to 1/4" for FR 5 - Alternate 1/4" angled FR location 6-1/8" pilot gas connection 7-1-1/4" NPT gas inlet
Series "RG" AIRFLO Burners Page 5509 Burner Sections Approximate Envelope Dimensions (Nominal, in Inches) RG-IV-6 6" Straight or 6"P Pilot RG-IV-12 or RG-IV-12B 12" Straight or 12B Back Inlet RG-IV-18 18" Straight RG-IV-24 24" Straight RG-IV-L 6" X 6" Elbow RG-IV-T 12" X 6" Tee RG-IV-36B 36B Back Inlet Typical End View 5/88
Page 5510 Series "RG" AIRFLO Burners Pilots, End Closures, and End Inlet Flange Sets NOTE: All "open" ends of burner assembly must be closed off with one of these end closures or pilots. One piece cast end closures should not be used if temperature rise exceeds 300ºF. Plain End Closure Sets End Inlet & Pilot Flange Sets RG-EP (2 pc) End Plate Set RGF- 1-1/4" -FR-SI (1 pc) Pilot Set w/si RGF- 1-1/4"- EP (2 pc) End Inlet Flange Set RGF- 1-1/4"- FR-SI (2 pc) Pilot Set w/si Pilot End Plate Sets Pilot Assembly Section RG-6P Pilot Section w/built-in Pilot includes end plate pilot w/si and a special 6" Series RG AIRFLO Burner assembly RG-Pak Pilot Set w/ RG-Pak Pilot Set w/ SI Adj. Orifice/SI RG-Pak Pilot Set w/orifice/cock/tube/si Common Dimensions (Nominal, in Inches) Typical End View Legend: 1-1/8" test connection 2-1/4" pilot gas connection 3-14mm spark ignitor connection 4-1/2" UV/FR conn. bushed to 1/4" for FR 5 - Alternate 1/4" angled FR location 6-1/8" pilot gas connection 7-1-1/4" NPT gas inlet Pipe threads on this page conform to NPT (ANSI Standard B2.1)
"NP" & "RG" AIRFLO Burners Page 5511 Accessories / Replacement Items Dimensions, Nominal in Inches 14mm Spark Ignitor Profile Plate Bracket Provides support for profile within closed burner loop. 1/4" dia. Flame Rod (1/4" NPT) Adjustable Orifice Support Bracket Division Plate Provides isolation of burner feed where desirable. Normally used in pairs as shown here. Mount to burner assembly at any joint. External Mounting Assembly Frequently used to provide easy accessibility to spark ignitor and flame supervision components. External Mounting Plate Used with typical pilot Opening Required Includes Mounting Plate with two (2) feed-through insulators for internal mounting of Spark Ignitor and Flame Rod. 5/88
Page 5512 Notes "NP" & "RG" AIRFLO Burners