Fireye D30 Series, Manual, Page: 9 / 24

9
£
1.
Selection of Wire.
— Use #14, 16 or 18 wires with 75
q
C, 600 volt insulation for up to 100 foot distances (signal loss
approximately 20% at 100 feet).
— For extended scanner wiring up to 500 feet, and for shorter lengths to reduce signal loss, use a
shielded wire (Belden 8254-RG-62/U coaxial cable, or equivalent) for each scanner wire of
UV1, UV2 and UV8A and red wires of 45UV5-1009. The ends of the shielding must be taped
and not grounded.
— Asbestos insulated wire should be avoided.
— Multiconductor cable is not recommended without prior factory approval.
2.
High voltage ignition wiring should not be installed in the same conduit with flame detector
wires.
INSTALLATION — INFRARED SCANNER TYPE 48PT2
Where possible, obtain the burner manufacturer’s instructions for mounting the scanner, otherwise
proceed as follows. A single scanner is used to detect both pilot and main flames. The sight pipe on
which the scanner mounts must be aimed so that the scanner sights a point at the intersection of main
and pilot flames. Proper scanner positioning must assure the following:
1. Reliable pilot flame signal.
2. Reliable main flame signal.
3.
A pilot flame too short or in the wrong position to ignite the main flame reliably, must not be
detected.
4.
Scanner must have unobstructed view of flame being monitored.
5. Flame being monitored must completely cover scanner field of view.
6.
To avoid nuisance shutdowns, it is important to avoid sighting hot refractory and to keep scanner
temperature low (below 125
q
F).
7.
When the proper position has been established, drill a hole through the furnace wall and install a
4" to 8" length of threaded black iron pipe on which to mount the 48PT2 scanner.
8.
When a satisfactory sighting position has been confirmed by operating tests, the sight tube
should be firmly welded in place.
Wiring
Attach the cable supplied with the scanner to a junction box. Splice the cable wires to a pair of wires
not smaller than #18. Install the complete run in a separate conduit to the control.
Continuous con-
duit bonding between scanner and control is mandatory. Scanner may be located up to 100 feet
from control. Do not pass scanner wiring through any junction box containing other wires. Do not
run other wires through scanner conduit. Asbestos insulated wire should be avoided.
CENTER LINE
OF MAIN FLAME
SCANNER
LINE-OF-SIGHT
SCANNER TARGET
ABOVE REFRACTORY
COMBUSTION
CHAMBER
PILOT
BURNER
SCANNER
SCANNER
SIGHTING TUBE
MAIN
SCANNER MUST NOT
SIGHT REFRACTORY