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Eclipse Veri-Flame Instruction Manual 818-2/02
Flame Rods
This section describes the proper wiring, installation and sighting considerations for
all sensors that can be used with a Veri-Flame.
Warning
Incorrect sensor installation may cause the sensor to generate a
false flame signal, possibly resulting in the collection of unburned
fuel in the combustion chamber. This unburned fuel creates the
potential for explosions which can result in injuries, death and
property damage. Be certain that the flame sensor detects ac-
ceptable pilot and main flames only.
Route sensor wiring a sufficient distance from ignition and other high voltage
or high current wiring to avoid electrical interference. Interference from
ground currents, nearby conductors, radio-frequency emitters (wireless divices),
and inverter drives can induce false flame signals. Shielded cables can help re-
duce interference with the shield connected to ground at the control end only.
The wire type and its capacitance (picofarads or microfarads) to ground may
cause low signal problems, so a grounded shield may decrease the signal due to
the cable’s internal capacitance. Multiple U.V. tube-type sensor leads run to-
gether without shielding may interfere or “cross talk”, so the shield or flexible
armor must be grounded to prevent this situation. For flame rod sensor runs
approximately 100 feet (30 meters) or greater, use Eclipse part number 21741
coax cable. To achieve the maximum wiring distance, the shield should not be
grounded (keep in mind that an ungrounded shield provides less protection
against electrical interference).
Note:
Unshielded sensor wiring must not be run in common with other wires; it
must be run in separate conduit. Use #14 to #18 AWG wire suitable for
90°C (194°F) and 600 volt insulation. Multiple unshielded flame sensor
wiring must not be run together in a common conduit or wireway. Multiple
shielded flame sensor cables can be run in a common conduit.
INTRODUCTION
Sensor Wiring
Sensor Installation
6
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Flame rods should be used only on gas burners. They accumulate soot on oil burn-
ers, causing nuisance shutdowns and unsafe operating conditions.
See the burner manufacturer’s literature for flame rod mounting location. When
installing flame rods, please consider the following: