Det-Tronics U5006 Air Duct Smoke Detector - Manual (Page 4)

95-8456 2.2 4
Insert the tubes in the appropriate holes in the duct 6.
and attach the detector enclosure to the duct using
1/4 inch mounting hardware.
External wiring is brought into the detector through
7.
the entry on the detector junction box or the M25
to 3/4 inch adapter. Connections are made to the
terminal strips TB-2 and TB-3 of the junction box
terminal board. Refer to the wiring diagrams in
Figures 4, 5, and 6. Use care not to damage the
wires by twisting them.
Detector connectionS
The U5006 contains four sets of relay contacts.
One set of N.O. Alarm contacts close upon detection 1.
of smoke.
One set of N.C. Trouble contacts close when the
2.
detector is powered.
One set of N.O. and one set of N.C. Aux alarm
3.
contacts.
AIR FLOW MONITORING
The pressure differential between the sampling and
exhaust tubes should be tested with the detector
mounted and air flowing through the duct. The measured
differential should be 0.023 to 1.85 inches of water as
measured using a manometer such as the Mark II or No.
460 air meter available from Dwyer Instruments, Inc., P.O.
Box 373, Michigan City, IN 46360.
Remove the sampling chamber cover. 1.
Insert the meter tubes, “low side” to the return tube 2.
outlet and “high side” to the sampling tube outlet.
If the pressure differential is not within the specified
3.
limits, the detector may not function properly.
Check the installation to be sure that the return and
sampling tubes are positioned and oriented properly.
Increasing the air flow within the duct should increase
the pressure differential, while decreasing the air
flow will decrease the pressure differential. Minor
adjustments to the return and air sampling tubes
will sometimes bring the pressure differential within
specified limits.
10.75 (27.3)
6.22 (15.8) 2.26 (5.7)
0.90 (2.3)
3.6 (9.1) 6.0 (15.2)
DIRECTION OF AIRFLOW
PIN LOCATION
1.87 (4.75) DIA., 2 PLACES 0.281 (0.72) DIA., 4 PLACES
A1190
Figure 2—Mounting Hole Dimensions in Inches (cm)