System Sensor DH400P - Manual (Page 10)

[6.2.3] Sensitivity Tests
[6.2.3.1] MOD400 or MOD400R Test
After verification of alarm capability, the MOD400 or
MOD400R test module may be used with a voltmeter to
check detector sensitivity as indicated 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] of this manual.
[6.2.3.2] R59-18-00 Calibrated Test Card (photoelec-
tronic units only)
After verification of alarm capability, the R59-18-00 test
card may be used to verify correct sensitivity of the detec-
tor head.
1. Remove the duct housing cover.
2. Remove the detector head from the housing as shown in
Figure 10.
3. Remove the photo head cover by placing a small blade
screwdriver in the side slot of the detector cover, twist-
ing it slightly until the cover can be turned counterclock-
wise.
4. Carefully reinsert the detector head into the duct hous-
ing and wait 50 seconds for power up. Do not hold the
swirl chamber to twist the detector head.
5. Insert the NO ALARM end of the test card into the test
slot (see Figure 12) and slide it counterclockwise until it
stops. The detector should not alarm after 20 seconds.
6. Remove the card and then insert the ALARM end into
the slot and slide it counterclockwise until it stops. The
LEDs should latch on within 20 seconds. Remove card
and reset detector at system control panel.
DETECTOR
HEAD
TEST COIL
Figure 11. RTS451/RTS451KEY test coil installation:
A78-1994-02
7. Put the cover back by gently rotating it clockwise until it
locks in place. Secure the duct housing cover using the 4
cover screws.
[7] Detector Cleaning Procedures
Notify the proper authorities that the smoke detector sys-
tem is undergoing maintenance, and that the system will
temporarily be out of service. Disable the zone or system
undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department.
[7.1] Air Filters
1. Turn off power to the system.
2. Remove and inspect sampling tube filters.
3. If 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.
[7.2] Photo Heads
1. Remove detector cover by placing a small blade screw-
driver into the slot located 90 degrees from the field test
port, twisting cover counterclockwise to remove.
2. Lift screen from photo chamber. Vacuum screen and
cover before using clean, compressed air to loosen and
blow out any remaining debris. Replacement screens
(RS24) are available.
3. Vacuum photo chamber, then use clean compressed air
to blow area clean.
4. Replace screen by aligning arrow on top with the field
test port on the detector. Push screen into place. Screen
should fit tightly to chamber.
5. Replace detector cover and turn clockwise to lock in
place.
D400-14-00 10 I56-554-05