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Step 6: Combustion Air System - Honeywell Eclipse ImmersoJet Design Manual


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You can find flame rod information in Bulletin 832 and
Information Guide 832.
Figure 3.9. UV Scanner
Figure 3.10. Flame Rod
Flame Monitoring Control
The flame monitoring control is the equipment that
processes the signal from the flame rod or the U.V.
For flame monitoring control you may select several
• flame monitoring control for each burner: if one
burner goes down, only that burner will be shut off
• multiple burner flame monitoring control: if one
burner goes down, all burners will be shut off
Other manufacturer's flame monitoring systems can be
used with the burner if spark is maintained for a fixed time
interval and is not interrupted when a flame signal is
detected during trial for ignition

Step 6: Combustion Air System

ImmersoJet burners are sold in these configurations:
• Burner with integral low pressure blower.
• Burner with integral high pressure blower.
• Burner less blower.
NOTE: This section describes how to size a blower for
burners purchased without a blower.
Effects of atmospheric conditions
The blower data is based on the International Standard
Atmosphere (ISA) at Mean Sea Level (MSL), which
means that it is valid for:
• sea level
• 29.92" Hg (1,013 mbar)
• 70ºF (21ºC)
The make-up of the air is different above sea level or in a
hot area. The density of the air decreases, and as a result,
the outlet pressure and the flow of the blower decrease.
An accurate description of these effects is in the Eclipse
Combustion Engineering Guide (EFE 825). The Guide
contains tables to calculate the effect of pressure, altitude
and temperature on air.
Figure 3.11. SMJ Turbo Blower
The rating of the blower must match the system
requirements. You can find all the blower data in Bulletin
Follow these steps:
1. Calculate the outlet pressure.
When calculating the outlet pressure of the
blower, the total of these pressures must be
• the static air pressure required at the burner
• the total pressure drop in the piping
• the total of the pressure drops across the valves
• the pressure in the immersion tube
• recommend a minimum safety margin of 10%
2. Calculate the required flow
The blower output is the air flow delivered under standard
atmospheric conditions. It must be enough to feed all the
burners in the system at high fire.


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