Installation | Immersion Tube Burners
3. If the gas pressure dœs not exceed air pressure by at least 2 osi, use an 8654 Bleeder, piping the "M" connection to the hole provided for that purpose in the burner mounting plate. (Subtract the tube backpressure from both the gas and air pressure before figuring the % bleed.)
1 . Bolt the burner flange to a matching flange welded to the immersion tube. Bolt these together tightly to prevent flue gas leakage. Leakage can cause instability and excessive noise under some conditions. (An optional mounting gasket is offered--see Parts List & Instr. 4762-1.) The burner should be as close as possible to the tank, because heat is released very close to the burner. Tank insulation, if any, should be removed to provide clearance around the tube to prevent overheating. 2. Connect the main gas regulator and valves, the pilot accessories, and a spark-ignited pilot as shown in the typical piping diagram below. A separate regulator must be used for each burner. For 4762-7-A, -7-B, and -8 Burners, add an 1807 Limiting Orifice Valve in the gas line as close as possible to the burner.
4. It is often difficult to set the air/fuel ratio by sight or sound; so use of a metering orifice or flue gas analyzer is strongly recommended.
Pipe or Tube
Flange or Tank Wall
Gasket 4 Studs (see table)
K
Fig. 1. Typical Piping Arrangement Plan View (Safety equipment not shown)
Pilot Mixer
Pilot Tip
Pilot Regulator Cross Connection
Flame Rod Opening
Main Air Control Valve
Burner
AIR
Pilot Gas Valve
Pilot Air Valve
Pilot Regulator
Air Impulse
Main Gas Valve (2 psi max.)
Metering Orifi ce (Optional)
Air/Gas Ratio Regulator
Table V. Installation Dimensions
Burner
Tube Size
Stud
Stud
Designation
Diameter
Length
K
4762-4 4762-6
4" 6" 8"
5⁄8 " 5⁄8 " 5⁄8 "
1 ½ " 1 ½ " 1 ¾ "
1⁄8 " 1⁄8 " ¼ "
4762-7-A, -7-B, -8
START-UP and ADJUSTMENT WARNING: Startup and adjustment of combustion equipment should only be done by trained personnel familiar with combustion technology, combustion equipment, and with the particular burner system, equipment, and controls.
1. Purge the gas supply line.
6. The flame should not start in the burner gas tube at any time. If this occurs at the low firing rate, turn the regulator’s spring adjusting plug clockwise until the flame moves out of the gas tube. (See Regulator Bulletin.)
2. Close all gas valves.
3. Set the main air control valve for about 2 osi pressure at the burner or about ¼ open.
7. Ignition should always take place at low firing rate (2 osi or less). High fire lighting or extinguishing may accidentally put out the pilot.
4. Open the pilot air valve. Energize the ignition transformer and open the pilot gas valve. The pilot should light in a few seconds. (See Pilot Bulletin.)
8. Adjust the high and low fire linkage settings (firing ratios) as desired. These can range from ½ osi (1"w.c.) to 16 osi.
5. Remove the protective cap, and open the limiting orifice gas valve (built into the back of 4762-4 and -6 Burners, separate on larger sizes) a few turns counterclockwise from the closed position. Open the main gas valve. If no main flame appears in 10 seconds, close the main gas valve and allow a few minutes for purging before trying again.
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.
Bulletin 4762 Page 4
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