Det-Tronics U7602B-P Unitized UV Flame Detector/Controller - Manual (Page 14)

8. The remaining wires (relay output wires and cur-
rent output wire) are connected to TB3 on the
controller module after it has been installed.
Route these remaining wires between the upright
bracket arms opposite the connector plug.
9. Remove the controller module from its shipping
container. Loosen, but do not remove, the four
mounting screws at the base of the controller
module.
10. On the bulkhead, hold the relay and current output
wires between the upright bracket arms opposite
the connector plug while folding the terminal pro-
tector flap down so that it covers TB1. Press the
controller module firmly into the mounting bracket
so that the screws on the controller module fit into
the four slots on the bracket with the connector
plug connected. Tighten the four mounting
screws to hold the controller module in place.
11. Connect the relay and current wires as appropri-
ate. Terminals 1 and 2 are the normally open Fire
Alarm relay contacts. Terminals 3 and 4 are the
Fault relay contacts, which are closed when no
faults are indicated (with no power applied, the
Fault relay is normally open, when power is
applied the contacts close after a 5 second time
delay). Terminal 3 is the current output. Attach
the wires to the appropriate screw terminals on
the terminal block. Figure 11 shows TB3 connec-
tions (relay and current output) for the standard
controller module as described above. Figure 12
shows TB3 connections for the optional Form C
and 4 to 20 ma controller modules.
12. Check all field wiring to be sure that the proper
connections have been made. Replace the con-
troller housing.
13. Remove the UV Detector module from its shipping
package. When handling the UV Detector
Module, be careful not to touch the sensor tube
since oil from the skin can attenuate UV radiation,
reducing the sensitivity of the tube.
IMPORTANT
Some Det-Tronics UV Detector modules have a
black jumper plug installed on the circuit board
connecting two gold pins together. This jumper
must not be installed when the module is used in
the U7602. If the jumper is installed in the loca-
tion indicated on Figure 17 (jumper pins), remove
it by pulling straight upward (if necessary, use
the hole at the top of the jumper to pry it off).
Discard the jumper.
14. Using the guide pin as a reference, install the
detector module on the terminal block (see Figure
17). Press the detector module firmly in place,
making sure that the four legs fit snugly against
the plastic terminal block.
15. Re-assemble the detector housing. Ensure that
the housing is tightened with the O-ring fully seat-
ed to maintain the watertight and explosion-proof
integrity of the detector. If the detectors are
equipped with cover locking devices, loosen the
clamp sufficiently so that the “catch” can be seat-
ed in the blind hole provided on the terminal cap
(see Figure 16). The clamp must then be fas-
tened securely around the detector barrel by
tightening with the proper tool.
16. Once the U7602 is assembled, check the viewing
window surface (Figure 18) and ensure that (1)
the split in the oi reflective ring is not aligned with
the source tube on the detector module and (2)
that the split in the oi ring is directed downward
to prevent a buildup of contaminants between the
oi ring and the viewing window.
11 95-8239
CLAMP SCREW
BLIND HOLE
BASEEFA CLAMP
CATCH
A1502
Figure 16—Cover Locking Clamp