Performance Data | Tempest® SE
— Combustion Air Requirement: 16-17.5"w.c. (4.0-4.4 kPa) at maximum input, maximum preheat 400°F (204°C)
— Control: Good performance with on-ratio, on/off and thermal turndown systems. 15% excess air is the recommended rich limit of operation. To achieve the minimum excess air ratio with cross-connected regulator systems, use a low pressure drop limiting orifice valve between the ratio regulator and the burner. — Piping: For cross-connected systems, maximum gas pressure at the burner can be adversely impacted by excessive pressure drop in the gas line between the ratio regulator and the burner. The design, selection, and installation of these systems must take into account the gas pressure required at the burner to achieve the desired heat release (i.e. gas flow). An 1122 butterfly valve can be used in place of an 1807 limiting orifice valve to minimize pressure drop downstream of the ratio regulator.
— Fuel: Natural Gas, Propane, Butane.
— Flame Supervision: UV detector or Flame rod in specially configured models. Flame rods can be used up to 2200°F (1204°C) operating temperature. UV detectors can be used to maximum operating temperature. Consult National Safety Standards andinsurance underwriters for specific flame supervision requirements. — Ignition: Direct spark (no pilot) with 6000 V transformer. Full- wave spark transformer required, one per burner. 4485 burners require spark for reignition. They will not relight from a hot tile or furnace.
4485 NATURAL GAS PERFORMANCE DATA
High Fire with Natural Gas (1020 Btu/scf) @ 15% Excess Air at Maximum Input
Burner Size
-5-A
-5-B
-6-A
-6-B
Maximum Input, Btu/h (kW)
500,000 (132)
750,000 (198) 75,000 (20)
1,000,000 (264)
1,500,000 (396)
Minimum Input On-Ratio, Btu/h (kW) Minimum Input Fixed Air, Btu/h (kW)
50,000 (13) 10,000 (3) 5,750 (154)
100,000 (26) 20,000 (5) 11,500 (308)
150,000 (40) 30,000 (8) 17,250 (461)
15,000 (4) 8,625 (231) 6.1 (15.2) 735 (19.7)
Air Flow scfh (Nm 3 /h)
Air Meter dp UA-DA "w.c. (mbar) Natural Gas Flow scfh (Nm 3 /h) Natural Gas dp UG-DG "w.c. (mbar) Maximum % XSA at Maximum Input Maximum % XSA at Minimum Input
5.1 (12.7) 490 (13.1) 5.0 (12.4)
5.9 (14.7) 980 (26.2)
6.2 (15.4)
1470 (39.4)
5.8 (14.4)
3.5 (8.7)
4.2 (10.5)
50
50
50
50
7,500
7,500
7,500
7,500
High Velocity Tile @ 15% Excess Air at Maximum Input with Natural Gas
Air Inlet Pressure Required UA "w.c. (mbar) Gas Inlet Pressure Required UG "w.c. (mbar)
16.7 (41.0) 16.2 (40.3) 25 (635) 540 (165)
16.0 (39.8) 13.8 (34.4)
16.5 (41.0) 12.5 (31.0) 33 (835) 630 (192)
17.5 (44.0) 14.5 (36.0) 38 (965) 680 (207) 9.5 (23.6) 7.0 (17.4) 43 (1092) 350 (107)
Flame Length, inches (mm)
28 (711)
Approximate Flame Velocity, f/s (m/s)
480 (146)
Medium Velocity Tile @ 15% Excess Air at Maximum Input with Natural Gas
Air Inlet Pressure Required UA "w.c. (mbar) Gas Inlet Pressure Required UG "w.c. (mbar)
9.9 (24.6) 8.9 (22.1) 28 (711) 320 (98)
9.0 (22.4) 7.2 (17.9) 28 (711) 250 (76)
9.0 (22.4) 5.5 (16.7) 38 (965) 310 (95)
Flame Length, inches (mm)
Approximate Flame Velocity, f/s (m/s)
Imperial inputs based upon gross calorific values (HHV). All metric inputs based on net calorific values (LHV). Velocity noted references high velocity tile option The listed air pressure is the maximum recommended for stable operation. Excess fuel operation is not recommended for 4485 burners.
Bulletin 4485 page 3
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