Step 7. Perform Detector Check
7.1 Air Flow
1. To verify sufficient sampling of ducted air, use a manom-
eter to measure the differential pressure created from
air flow across the sampling tubes. The pressure should
measure no less than 0.01 inches of water and no greater
than 1.20 inches of water.
2. To determine that smoke is capable of entering the sens-
ing chamber, conduct a visual examination to note any
obscurations around the sensing chamber. If a smoke
test is required, blow smoke from a cigarette, cotton
wick, or punk directly at the smoke detector head. It is
important to plug the exhaust and sampling tube hole
to prevent ducted air from blowing smoke away from
the smoke detector head. Record all test records in the
Detector Test Log at the end of this manual.
CAUTION
Remove the plugs after testing or the detector will not
sense smoke in the air duct.
7.2 Alarm Tests
Before replacing the duct housing cover, check the detector
interconnections. Check the DH500ACDC as follows:
A. M02-04-00 Magnet Test
1. Make sure power is applied to the detector.
2. Position the painted surface of the test magnet against
the housing next to the rib molded onto the outside of
the housing (see Figure 7).
3. The LEDs on the detector should latch on as should
any accessories (PA400, RA400ZA, RTS451) and the
alarm condition verified at the control panel. The
control panel must be active to initiate an alarm.
B. RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facili-
tates testing of the duct detector alarm capability.
The DH500ACDC duct detector cannot be reset by the
RTS451/RTS451KEY. It must be reset at the system con-
trol panel.
To install the RTS451/RTS451KEY test coil, connect the
device as shown in Figure 9. Place the coil in the detector
housing with the arrow facing up and pointing toward the
detector as in Figure 9. Attach the coil leads to the housing
terminals as shown; polarity is not important. Firmly screw
the test coil mounting bracket in place over the test coil.
The resistance of the wire connecting the remote test sta-
tion to the duct detector must be less than 25 ohms.
7.3 MOD400R Sensitivity Test
After verification of alarm capability, use a MOD400R test
module with a voltmeter to check detector sensitivity as
described in the MOD400R installation manual. The hous-
ing cover must be removed to perform this test.
If the MOD400R readings indicate that the sensor head is
outside of the acceptable range, the sensor heads require
cleaning (refer to
Periodic Maintenance Requirements
).
7.4 Trouble Test
The capability of trouble detection is tested by removing
the detector head from the duct housing. The detector
head is removed by rotating it counterclockwise about
10 degrees (Figure 8). The system control panel should
indicate a trouble condition. Reinstalling the detector head
should clear the trouble condition.
SAMPLING TUBE
FILTERS
SAMPLING TUBE
MOUNTING
SCREWS
DETECTOR HEAD
EXHAUST
FILTER ADAPTER
DETECTOR BASE
INLET SAMPLING TUBE
FOAM GASKET
Figure 6. Sampling tube filter installation:
H0239-00
D500-07-00
7
I56-432-11R
