Det-Tronics U7652B, C Unitized UV/IR Flame Detector User Manual

Page 12

In addition, the auxiliary relay in the U7652C can be
set for actuation by either “UV radiation only” or “both
UV and IR radiation” (indoor applications only).

Detector programming is accomplished using jumper
plugs at pin locations W1, W2, W3 and W4 on the
printed circuit board located inside the detector junc-
tion box. See Figure 4 to locate the pins.

Refer to Table 5 to determine whether the jumper plug
should be installed or omitted for a desired option.
The detector is furnished from the factory with the
jumpers “removed” (the jumper is connected to only
one of the two pins). This programs the detector for
the following:

— Latching alarm output
— Automatic

testing

— Three second response time.

To change the programming of the detector, remove
the junction box cover by loosening the six screws
(without power applied), then position the jumpers as
desired.

STARTUP AND CHECKOUT
PROCEDURE (MANUAL

TEST)

The following procedure should be performed when
installation is complete and, at minimum, every six
months. More frequent checkouts ensure greater
system reliability.

Disable any extinguishing equipment that is con-
nected to the system.

Apply input power to the system. (Wait ten sec-
onds after applying power before testing the sys-
tem.)

Shine a Det-Tronics model W867 UV/IR test lamp
into the viewing window of the detector under
test, or press and hold the manual

test button if

one has been wired into the system. The Fire
relay will energize and the LEDs will be illuminat-
ed when the device goes into an alarm condition.

Turn off the UV/IR source (or release the

test

button). If the unit is programmed for non-latch-
ing operation, the Fire relay will become de-ener-
gized and the LEDs will turn off when the UV/IR
source is removed. If the unit is programmed for
latching operation, it can be reset by removing
input power (0.1 second minimum).

Repeat this test for all detectors in the system. If
a unit fails the test, refer to Table 6, Manual

Troubleshooting, for information on correcting the
problem.

Double check all detectors in the system to be
sure that they are properly aimed at the potential
hazard.

Re-activate all extinguishing equipment that is
connected to the system.

TROUBLESHOOTING

Refer to the “Manual

Selected (Jumper W2

Installed)” section below for problems that occur dur-
ing the “Startup and Checkout Procedure (Manual

Test),” or during normal operation when manual

operation is selected. Refer to the “Automatic

Selected” section below for problems that occur dur-
ing normal operation when automatic

operation is

selected.

IMPORTANT

To ensure reliable protection,

related faults

should be corrected promptly. This is particularly
important in environments where oily substances
can accumulate on the detector window, poten-
tially blinding the detector.

MANUAL

SELECTED (Jumper W2 Installed)

or Failure During Startup and Checkout Procedure
(Manual

Test)

When manual

is selected, the automatically initiat-

test is disabled. In normal operation with man-

ual

selected, the sensor LEDs blink alternately at

five second intervals.

Table 5—Programmable Options

* Factory Setting

** U7652C with Auxiliary Relay Only

Pin Location

Function

Jumper Removed

Jumper Installed

Latch/Non-Latch

Latching*

Non-Latching

Test

Automatic*

Manual

Alarm Response

3 Second Response*

0.5 Second Response

W4**

Aux. Relay Operation

UV only*

UV or IR