Det-Tronics U7652B, C Unitized UV/IR Flame Detector - Manual (Page 13)

When manual oi is selected, the detector is tested
either by pressing and holding the manual oi button
(if installed) or by shining a W867 Test Lamp into the
detector viewing windows. The “Startup and
Checkout Procedure (Manual
oi Test)” section of this
manual explains this procedure. For problems
encountered during the manual
oi test, refer to Table
6 - Manual oi Troubleshooting.
AUTOMATIC oi SELECTED
The Automatic oi feature (if selected) tests the detec-
tor approximately once each minute, checking the
cleanliness of the optical surfaces, sensor sensitivity,
and proper functioning of the electronic circuitry.
Proper operation of the detector is indicated by simul-
taneous blinking of both the UV and IR sensor LEDs
every 5 seconds. If a problem is detected for three
consecutive automatic
oi tests, a fault signal is gen-
erated. If the detector passes three consecutive
automatic
oi tests, the fault signal will then be
cleared. If a detector fault is indicated, observe the
detector LEDs as well as the status of the detector
relays, then refer to Tables 1 and 7 for status and
troubleshooting information.
Perform the “Startup and Checkout Procedure
(Manual
oi Test)” in this manual to verify the proper
operation of the Fire relay and LEDs.
FIELD TESTING UV/IR DETECTORS
Det-Tronics UV/IR flame detectors contain sensitive
electronic components (ICs, transistors, etc.) that can
be damaged by electrostatic discharge (ESD).
Common causes of damage include improper han-
dling during installation/service, ground faults, power
supply transients, and lightning strikes. All Det-
Tronics systems are designed with extensive protec-
tion circuitry, however, damage can still occur.
The following field test procedure has been devel-
oped to test Det-Tronics UV/IR flame detectors for
ESD-damaged components:
1. Disable (bypass) all automatic fire extinguishing
and shutdown equipment prior to testing. If the
detector is part of a Det-Tronics controller-based
system, simply move the controller key switch to
the Test mode.
11 95-8385
Condition Indication Corrective Action
Normal operation with Fault relay de-energized Check the operation of the power source and the
manual oi test not LEDs not blinking continuity of the detector wiring. If the detector appears
initiated to be “dead” with power applied, remove power and
(Manual oi Selected) replace the motherboard.
Manual oi Test Fire relay did not energize The other sensor has failed to respond.
and the LEDs of only one • Check the cleanliness of the viewing window and
sensor are illuminated repeat the test.
• If the sensor fails to respond again, replace the sensor
module.
• If the sensor still does not respond, replace the
motherboard.
Manual oi Test Fire relay did not energize Both sensors have failed to respond.
and the LEDs of neither • Check input power and external wiring.
sensor are illuminated • Check the cleanliness of both viewing windows.
If the detector still does not respond:
• If using a test lamp, check the battery, window, etc. to
be sure that the test lamp is working properly.
• If using the manual oi switch, check the switch for
proper operation and wiring.
If the detector still does not respond, replace the
motherboard.
Table 6—Manual oi Troubleshooting