Fireye 60-2991 Series, Manual

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© 2021 Carrier 17
5.
Smoke or unburned combustion gases absorb ultra-violet energy. On installations with negative
pressure combustion chambers, a small hole drilled in the UV1AL sight pipe assists in keeping the
pipe clean and free from smoke. For positive pressure furnaces, provide clean air to pressurize the
sight pipe, if necessary.
6. Two UV1AL scanners may be installed on the burner if it is necessary to view two areas to
obtain reliable detection of the flame. They must be wired in parallel.
7. To increase scanner sensitivity with UV1AL scanner, a quartz lens permits location of the scanner
at twice the normal distance. Use 1/2” x 1 1/2” pipe nipple between UV1AL scanner and the
coupling.
8. Request the assistance of any Fireye field office for recommendations of a proper scanner installation
on a non-standard application.
TYPICAL UV SCANNER INSTALLATIONS
WIRING - UV SCANNERS
To connect the scanner to the control, the UV1AL scanner is supplied with UV1AL-3
(36") or UV1AL-6 (72") (0.9 m or 1.8 m) of flexible cable. The UV90L is supplied with
a terminal board. Use two #18 AWG conductors to connect the UV90L to the control.
The UV5 is supplied with 80” (2m) of flexible cable (detachable).
If it is necessary to extend the scanner wiring, the following instructions apply:
There is no polarity associated with the scanner wiring. Scanner wires must be installed in a separate
conduit. The wires from several scanners may be installed in a common conduit.
1.
Selection of Wire
a. Wiring: For extended scanner wiring up to 500 feet (152 M), and for shorter lengths to reduce
signal loss, use a shielded wire (Belden 8254-RG62 coaxial cable, or equal) for each scanner
wire. The ends of the shielding must be taped and not grounded.
b. Avoid asbestos insulated wire.
c. Multi-conductor cable is not recommended without prior factory approval.
2.
High voltage ignition wiring must not be installed in the same conduit with flame detector wires.