System Sensor DH400P - Manual (Page 9)

[6.1.3] Filter Replacement
The filters do not substantially affect smoke performance
even when up to 90% of the filter is clogged. Quarterly vi-
sual inspection usually suffices to determine whether the
filters should be replaced because only a high percentage of
contamination affects performance. If further testing is re-
quired, compare differential pressure readings with and
without the filters installed. If the difference exceeds 10%
replace the filters. In no case should the pressure differen-
tial fall below 0.01 inches of water.
[6.2] Standby, Alarm, And Sensitivity Tests
[6.2.1] Standby And Trouble
Standby —
Look for the presence of the flashing red
LEDs through the transparent housing cover.
The LEDs should flash approximately every
10 seconds.
Trouble — If the detector LEDs do not flash, then the de-
tector lacks power (check wiring, panel, or
power supply), the head is missing (replace),
or the unit is defective (return for repair)
Test — The trouble condition can be caused inten-
tionally to verify correct operation of the sys-
tem. Remove the detector head (see Figure
10) to cause a trouble condition locally and at
the system control panel.
[6.2.2] Alarm Tests
[6.2.2.1] M02-04-00 Magnet Test
1. Place the painted surface of the magnet into the TEST
locator molded into the side of the housing (Figure 9).
2. The red alarm LEDs on the detector should latch on, as
Figure 9. Testing detector alarm: Figure 10. Detector head removal:
TEST
LOCATOR
TEST
MAGNET
PAINTED SIDE
TOWARD HOUSING
DUCT
HOUSING
DETECTOR
HEAD
TWIST
COUNTERCLOCKWISE
TO REMOVE
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
DETECTOR
HEAD
A78-2325-00
A78-2139-00
should any accessories (i.e. RA400Z, RTS451). Verify
system control panel alarm status, and control panel ex-
ecution of all intended auxiliary functions (i.e. fan shut-
down damper control, etc.).
3. The detector must be reset by the system control panel.
[6.2.2.2] RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates test
of the alarm capability of the duct detector as indicated in
the RTS451/RTS451KEY manual. The DH400 duct detector
must be reset by the system control panel.
To install the RTS451/RTS451KEY, connect the device as
shown in Figure 7; wire runs must be limited to 25 ohms or
less per interconnecting wire. Place the coil in the detector
housing with the arrow facing up and pointing toward the
detector as in Figure 11. Attach the coil leads to the housing
terminals as shown; polarity is not important. Firmly screw
the bracket in place over the test coil.
D400-14-00 9 I56-554-05