Application Notes & Special Engineered Options | HiRAM ®
HIGH BACK PRESSURE
RECOMMENDED SPARE PARTS
Standard 4575 burners can be operated with up to 4 psi of back pressure without modification. For higher pressures, special engineered designs are available for up to 15 psi. SWING BOLT BACKPLATE DESIGN The classic swing bolt backplate version of the HiRAM® is available as an engineered special. This design can be useful in applications where the backplate needs to be removed often. STANDARD SINGLE & SPECIAL DOUBLE IGNITION/FS CONNECTIONS Standard 4575 burners have a single connection block (boss) that contain a pair of 3/4" FPT ports, one each for ignition and flame supervision. The location of the boss is configured when the burner is ordered. Openings in the "Gas Tube Air Sleeve Assembly" (stabilizer) inside the burner body, are aligned with the ignition/FS ports when the burner is factory assembled. Double ignition/FS are available as an engineered special. For most sizes, the blocks must be 180° or 90° apart. LNI INJECTOR MOUNTING PLATE Standard HiRAM® burners operate with relativity low NOx emissions, but they can be configured to use Low NOx Injection "LNI"™ technology for ultra low NOx emissions. 4575 LNI™ burners are operated as a conventional high velocity burner when furnace temperature is below 1450°F (790°C). When the furnace is above that temperature, the burners can be automatically switched to LNI™ firing to inhibit formation of NOx. Air continues to flow through the center port of the burner, but gas is switched to a strategically placed outboard injector. LNI™ radically changes the mixing of the gas and air. During conventional firing, mixing and combustion is concentrated primarily within the burner tile, When firing with LNI™, the furnace space in front of the burner is used for mixing and combustion.
As with any industrial equipment, the selection of burner spare parts should be based on the application and the end user’s tolerance for downtime while waiting for replacement parts from the manufacturer. If a facility has multiple burners of the same type, having a complete spare burner can be justified.
- If there are plans to disassemble any part with a gasket, it is a good idea to have that spare gasket available in case it tears.
— Spare parts that are good to stock are: — Pilot tips, pilot ratio regulators — Igniters, and ignition cables — Flame supervision parts, (flame relays, flame rods and UV cells) — Observation ports — Gas Tube and Air Sleeve Assembly, if the burner is operated at a very high temperature.
CHANGING THE GAS INLET ARRANGEMENT
If the gas connection is rotated to a new position in the field without re-orienting the "Gas Tube & Air Sleeve Assembly", the ignition and flame supervision ports will be blocked, which could damage the burner, prevent proper operation and void the warranty.
To re-orient the "Gas Tube & Air Sleeve Assembly"
— Remove the spark plug and flame rod, if equipped, to prevent damage — Remove the bolts that connect the gas connection assembly to the burner body — Pull the burner internal assembly out of the burner body — Remove the two bolts that secure the Gas Tube & Air Sleeve Assembly to the Gas Connection Assembly — Rotate the Gas Tube & Air Sleeve Assembly so that its' igni- tion and flame supervision holes line up with the ports on the body when the gas connection is in the new arrangement rotation. — Reverse the procedure to finish the re-orientation.
Bulletin 4575 Page 11
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