Capacities | 4723 Tube Gas Burners
Table 1 . CAPACITIES and TUBE SIZES. Capacities shown are with 30% primary air (+70% secondary air). For capacities in Btu/hr, multiply cfh air capacity by 100. Apply correction factor from Table 2 for 20% or 40% primary air operation.
cfh Air Capacity with Air Pressure across the burner of
Burner
Radiant Tube inside diameter † 3¾" min to 4 1⁄8 " max
designation 0.2 osi 0.5 osi 1 osi 4 osi 9 osi 16 osi
4723-2 4723-3 4723-4 4723-4B 4723-5 4723-6
240 345 581 800
375 565 965
585 890
1480 1685 2785 3905 5015 7115
1880 2565 4270 5960 7500
2380 3420 5740 7785 9925 14535
3 ¾ " 4 ¾ "
5 ¾ " 6 ½ " 6 ¾ " 7 ½ " 8 ¼ "
1365 2005 2530 3235
1325 1930 2235
5"
1420 1695
5 ¾ " 5 ¾ "
10840
† Consult Fives North American product manager if your tube diameters are not within limits shown.
Table 2 . P rimary Air Screw Adjustments Required for 20%, 30% and 40% Primary Air
Adjusting Screw Turns Open
4723-2 4723-3 4723-4 4723-4B 4723-5 4723-6
20% Primary Air, 87.5% rated capacity 30% Primary Air, 100% rated capacity 40% Primary Air, 117% rated capacity
0
0
0 2
1
0 2
0 5
3 ½
3 ½
4
10+
10+
5+
‡
6 ½ +
*
* 30% maximum primary air for -6 size. ‡ 32% maximum primary air for -4B size, minimum primary air is 15%.
PROPANE Evenglow burners are suitable for use with propane gas, but the primary air must be adjusted wide open and ratio set slightly leaner to avoid soot formation. The presence of propylene in any quantity can increase soot formation in burner and tube. Zero propylene content should be specified for best operation. U. V. FLAME SUPERVISION Refer to Bulletin 8832, page 3, for choices of flame detectors and adapters. The UV sensor should be mounted to the center location on the backplate for best results. The "Y" adapter allows for use of the center port for UV and observation. EXTRA LONG "L" DIMENSION Special L dimensions, for mounting in various wall thickness and special tubes, are offered in 1" increments from 12" to 24". To request an extra length stabilizer, order the 4723 burner with the specified "L" dimensions that are needed. Example: if a burner with a 15" "L" is wanted, specify the 15" length when ordering.
BLOWER SIZING The primary air adjustment may be adjusted to a maximum of 40%. Therefore the blower should be selected to deliver 117% of the rated total burner capacity. LIGHTING ARRANGEMENTS Direct Spark Ignited Burners. The igniter is included with the burner.The main flame is ignited by a simple electrode located behind the flame front for cool long-life operation. The spark should be turned on before the burner gas valve is opened. During the ignition period, a continuous 6000 volt spark is required. Spark distributor systems cannot be used with 4723 direct spark ignited burners. After the burner is ignited, the spark must be turned off for proper burner operation. Pilot Ignited Burners include a pilot and spark plug. A 6000 volt transformer is required. After lighting, the spark should be turned off to prolong electrode life. Spark distributor systems can be used with this burner. The pilot has 15,000 Btu/h HHV capacity at the maximum allowable mixture pressure of 6"wc and requires a 4031 Mixer. CONTROL AND ADJUSTMENT Burner must be ignited at low fire (4 osi air pressure max.). Refer to Sheets 4723-3 and 4723-4 for additional instructions and requirements. Accurate air/gas ratios can be determined by using 8697 Metering Orifices in the fuel and air lines, or by flue gas analysis. Biasing the ratio regulator to run the burner with more excess air at low fire will reduce CO. The optional air jet will allow the burner to maintain 2-3% O 2 throughout the entrie turndown range while maintaining low CO emissions.
ADDITIONAL 4723 DATA SHEETS 4723-1 Dimensions & Spare Parts
4723-2 Engineering Data, Air Flow, Excess Air Charts 4723-3 Control System & Installation Instructions 4723-4 Basic Operation
Bulletin 4723 Page 3
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