UV-4 Flame Detector
372000-28 Rev J
6
Section 3 Commissioning
When installing a detector head for the first time, ensure the following requirements are satisfied:
•
The physical mounts are adequate to support the weight of the detector head in the position required
for operation.
•
The ball valve lever of the cooling-air line moves through its entire operating range without
obstruction from any structure, cable, or hose.
•
The cooling-air hose and I/O cable do not interfere with the operation of any moving components at
the boiler front. The I/O cable does not contact hot surfaces capable of melting its insulation.
After installation of external amplifiers for the flame detectors, perform an operational checkout as
follows:
1.
If the system uses rack-mounted amplifier assemblies, ensure that all power supplies for the flame
detector system are adjusted to the required voltage levels.
2.
Apply operating power to the external amplifier. If a dual-range amplifier assembly is being used,
ensure that the UV mode of operation is selected. Verify that the voltage outputs from the amplifier
are at the correct level.
3.
Verify operation of the detector head as follows:
a.
If already installed, remove the detector head and base assemblies from the furnace mounting.
b.
Reassemble the flame detector and place a UV light source 1 to 4 feet from the surface of the
lens or the end of the fiber-optic light guide.
c.
Use an oscilloscope to measure the signal from the flame detector head at the input terminal of
the external amplifier. The signal observed should be a series of digital pulses having a
maximum frequency between 1 and 2 kHz.
d.
Blind the detector cell. Verify that the external amplifier su15 vdc to energize the shutter
solenoid. Ensure that the output signal from the detector head is lost.
4.
After checkout, return the system to normal configuration.
Section 4 Removal / Installation
The UV-4 flame detector is designed for front-mounted, direct-view, or fiber-optic sighting of the burner
flame. Initial installation of a new flame detector normally is accomplished with the furnace cold and
depressurized. However, failure of a flame detector during operation requires prompt replacement of the
head assembly. Major considerations for removal/installation of a flame detector head during furnace
operation are as follows:
1.
Remove power from the external amplifier assembly for the flame detector being replaced.
2.
Loosen the bolt securing the head assembly to the base assembly. Carefully disengage the
mating internal connectors to remove the head assembly.
3.
Perform these steps in reverse order to install a replacement head.
