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Chapter 2. MOUNTING
What to know before installation
• For proper installation of the device, thoroughly read the instruction
manuals for the burner, boiler, and other equipment provided by the
combustion equipment manufacturers. Make an appropriate instal-
lation plan according to those instruction manuals.
• This device must monitor actual flames. Make the mounting posi-
tion of the device as close to the flame as possible unless that posi-
tion affects the equipment layout around the burner, the operating
temperature, etc. The shorter the distance between the device and
the burner nozzle, the more ultraviolet radiation can be detected.
• Mount this device away from the ignition transformer. Mount the
ignition transformer as close to the burner as possible, and be sure
to ground the transformer.
Methods of monitoring burner flame
zMonitoring of the pilot flame only (continuous, intermittent pilots)
The main burner must be reliably ignited even with the smallest
pilot flame that this device can detect. For this reason, throttle the
pilot manual fuel valve so that the main burner can be barely ignited.
Under this condition, adjust the device so that only the tip of the pilot
flame is monitored. Adjust the device so that the monitored area is as
close to the tip of the flame as possible, and is also along the axis of
the pilot flame.
zMonitoring of both pilot and main flames (continuous, intermittent pilots)
Adjust the device so that it monitors the area where the pilot and the
main flames overlap.
zMonitoring of main flame only (interrupted pilot)
Adjust the device so that it monitors the part of the main flame that is
the most stable in any combustion condition (low fire, high fire, etc.).
In special combustion conditions, the use of two detectors is recom-
mended in order to monitor the low and high fire positions separately.
zSeparate monitoring of pilot and main flames (continuous, intermittent pilots)
Make sure that the detector monitoring the main flame cannot mis-
takenly detect the pilot flame. If it detects the pilot flame when there
is a flame failure of the main burner, the flame failure will not be de-
tected, and the fuel supply will not be shut off.
zMonitoring if there are multiple burners in the same combustion chamber
Mount a UV sensor on each burner, making sure in each case that
another burner’s flame is not detected.
Note that there is an electrical discharge inside this device’s tube unit
while a flame is detected. Since ultraviolet rays are emitted from the
tube due to this electrical discharge, if multiple detectors are used,
their position must be adjusted so that detectors cannot detect ultra-
violet rays emitted from the tube unit of other detectors.
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