[9.1.3] Smoke Entry Test
To determine if smoke is capable of entering the sensing chamber, visually identify any obstructions. Plug the exhaust and sampling tube holes
to prevent ducted air from carrying smoke away from the detector head, then blow smoke such as cigarette, cotton wick, or punk directly at the
head to cause an alarm. REMEMBER TO REMOVE THE PLUGS AFTER THIS TEST, OR THE DETECTOR WILL NOT FUNCTION PROPERLY.
[9.1.4] Air Flo Test Using Dwyer Series 607 Differential Pressure Transmitter
Verify the air speed of the duct using an anemometer. Air speed must be at least 100 FPM. Wire the Dwyer transmitter as shown in Figure 8. Connect
the leads of the meter to either side of the 1000
Ω
resistor. Allow unit to warm up for 15 seconds. With both HIGH and LOW pressure ports open to
ambient air, measure and record the voltage drop across the 1000
Ω
resistor (measurement 1), 4.00 volts is typical. Using flexible tubing and rubber
stoppers, connect the HIGH side of the transmitter to the sampling tube of the duct smoke detector housing, and the LOW side of the transmitter to
the exhaust tube of the duct smoke detector housing. Measure and record the voltage drop across the 1000
Ω
resistor (measurement 2). Subtract the
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.
[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.
[9.2.1] 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.
F300-27-00
6
I56-1975-004R
Figure 8. Procedure for verifying air flow:
HIGH
LOW
9 VOLT
BATTERY
9 VOLT
BATTERY
9 VOLT
BATTERY
TO SAMPLING TUBE
TO EXHAUST TUBE
DIFFERENTIAL
PRESSURE
TRANSMITTER
MODEL #607-01
15 TO 36
VDC SUPPLY
1000 OHM 5%
1 WATT RESISTOR
VOLT METER FLUKE
MODEL 87 OR
EQUIVALENT
+
–
Figure 9. Wiring Diagram for D350PL Duct Smoke Detector using a UL listed control panel
TEST
RA400Z
R
T
S451
KEY
COMMON
COM(+)
COM(–)
TEST
RA400Z
R
T
S451
KEY
COMMON
COM(+)
COM(–)
+
–
COM (+) COM (–)
COM (+) COM (–)
1ST DETECTOR
IN LOOP
2ND DETECTOR
IN LOOP
COMM.
LINE
UL LISTED
CONTROL
PANEL
H0105-00
H0136-01
