Forney Corporation
UNIFLAME User’s Manual
Publication 372000-48 Rev H
SECTION 3 DETECTOR WIRING
All wiring to the detector should be rated at 90
°
C. For runs less than 1000 feet, the use of Forney detector
cable P/N 405842-XX is recommended. For runs in excess of 1000 feet, please consult the factory. To
reduce the electrical noise interference, the detector cable should be installed in rigid or flexible conduit.
Take precautions to keep the detector cable away from any high inductive wiring associated with high
inductive loads or high voltage / high energy spark ignition systems.
Because the UNIFLAME Series flame detectors require 24 Vdc power for operation, connection of a 24
Vac, 120 Vac, or 220 Vac power source will damage the detector. Therefore, external 2.0 Amp fuses are
recommended to protect the processor flame relay and the fault relay contacts. See Figure 6.
Figure 6 - Cable Connection
Notes:
1. Flame relay contacts are shown in the de-energized (no flame) condition.
2. Fault relay contacts are shown in the de-energized (fault) condition.
3. Brown and orange wires are a twisted pair.
4. Cable shield not shown.
5. With Remote File Select programmed as “LINE”, external switches SW1/SW2 (not furnished) will
select between four internal memory files, when connected to 24 Vdc (-) supply (see Section 4.1).
6. External 2.0 Amp fuses recommended.
8
