System Sensor DH400ACDCIHT - Manual (Page 9)

[5.2.2] Alarm Tests
[5.2.2.1] M02-04-01 Magnet Test
1. Place the painted surface of the magnet into the Test
locator molded into the side of the housing (see Figure
10).
2. The red alarm LEDs on the detector should latch on,
as should any accessories (PA400, RA400Z, RTS451,
APA451). Verify auxiliary functions (such as fan shut-
down) and system control panel alarm status.
3. Place the painted surface of the magnet into the Reset
locator molded into the side of the housing (see Figure
10). This should clear the latched alarm condition at the
detector. If a system control panel is used, the panel may
also require resetting.
[5.2.2.2] 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 DH400ACDCIHT
duct detector can be reset by the RTS451/RTS451KEY. If
a system control panel is used, the panel itself may also
require resetting.
To install the RTS451/RTS451KEY, connect the device as
shown in Figure 8; 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 12. Attach the coil leads to the hous-
ing terminals as shown; polarity is not important. Firmly
screw the bracket in place over the test coil.
Figure 10. Testing detector alarm: Figure 11. Detector head removal:
TEST
LOCATOR
TEST
MAGNET
PAINTED SIDE
TOWARD HOUSING
DUCT
HOUSING
DETECTOR
HEAD
RESET
LOCATOR
TWIST
COUNTERCLOCKWISE
TO REMOVE
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
DETECTOR
HEAD
H0243-00 H0244-00
[5.2.3] Sensitivity Tests
[5.2.3.1] MOD400R Sensitivity Test
After verification of alarm capability, use the MOD400R test
module with a voltmeter to check detector sensitivity as
described in the test module’s manual. The housing cover
must be removed to perform this test.
If test module readings indicate that the detector head is
outside of the acceptable range that is printed on the back
of the detector head, the detector head requires cleaning
per Section [7].
[6] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector sys-
tem is undergoing maintenance, and that the system will
be temporarily out of service. Disable the zone or system
undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department.
[6.1] Air Filters
1. Turn off power to the system.
2. Remove and inspect the sampling tube filters.
3. If the filters are heavily coated with dirt, replace them
with new filters. If they are not heavily coated, use a
vacuum cleaner or compressed air nozzle to remove
dust, then reinstall the filters.
[6.2] Ion Heads
1. Remove the detector cover by depressing the three lock
prongs on the top of the cover and rotating the cover
counterclockwise to remove the cover and screen assem-
bly (see Figure 14). The optional CRT400 Cover Removal
Tool makes cover removal easier.
2. Carefully pull the screen out of the cover.
D400-64-00 9 I56-991-08R