voltage recorded in measurement 1 from the voltage recorded in measurement 2. If the difference is greater than 0.15 volts, there is enough air flow
through the duct smoke detector for proper operation
.
Figure 8. Procedure for verifying air flow:
DIFFERENTIAL
PRESSURE
TRANSMITTER
MODEL #607-01
HIGH
LOW
TO SAMPLING TUBE
TO EXHAUST TUBE
VOLT METER
FLUKE MODEL 87
OR EQUIVALENT
1000 OHM 5% 1 WATT RESISTOR
9 VOLT
BATTERY
9 VOLT
BATTERY
9 VOLT
BATTERY
15 TO 36VDC
SUPPLY
H0163-01
[9.1.5] Filter Replacement
The filters do not substantially affect smoke performance even when up to 90% of the filter is clogged. Quarterly visual inspection usually suffices to
determine whether the filters should be replaced because only a high percentage of contamination affects performance. If further testing is required,
compare differential pressure readings with and without the filters installed. If the difference exceeds 10% replace the filters. In no case should the
pressure differential fall below 0.0015 inches of water.
[9.2] Standby, Alarm, And Sensitivity Tests
[9.2.1] Standby And Trouble
Standby —
If programmed by the system control panel, look for the presence of the flashing LEDs through the transparent housing cover. The
LED will flash with each communication.
Trouble —
If programmed by the system control panel and the detector LEDs do not flash, then the detector lacks power (check wiring, panel
programming, or power supply), the detector board is missing (replace), or the unit is defective (return for repair).
Test —
The trouble condition can be caused intentionally to verify correct operation of the system. Remove the detector board to cause a
trouble condition locally and at the system control panel.
J500-42-00
6
I56-2198-003R
Figure 9. Wiring Diagram for DH300PL Duct Smoke Detector using a UL listed control panel
TEST
RA400Z
RT
S451
KEY
COMMON
COM(+
)
COM(–)
TEST
RA400Z
RT
S451
KEY
COMMON
COM(+
)
COM(–)
+
–
COM
(+)
COM
(–
)
COM (+)
COM
(–
)
COMMUNICATION
LINE
UL LISTED CONTROL
PANEL
1ST DETECTOR
IN LOOP
2ND DETECTOR
IN LOOP
H0105-00
