System Sensor DH400 Installation And Maintenance Instructions Manual page 11

Figure 12. Photo head exploded view:
TEST SLOT
HEAD COVER
REMOVAL SLOT
[7.3] Ion Heads
1. Remove 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. The CRT400 Cover Removal Tool makes cover re-
moval much easier.
2. Carefully pull screen out of cover.
3. Clean screen thoroughly with a soft brush or vacuum.
Replacement screens (RS14) are available.
4. Brush or vacuum inside area of cover. Cover may then
be blown out using clean, compressed air.
5. Vacuum sensing chamber before using clean, com-
pressed air to loosen and blow out any remaining debris.
6. Press screen back into cover.
7. Replace detector cover onto sensing chamber. Turn
clockwise to lock into place.
[7.4] Reinstallation
1. Reinstall detector in housing.
2. Restore system power.
3. Perform Detector Check, Section [5.7] of this manual.
4. Notify the proper authorities that testing has been com-
pleted and the smoke detector system is operating
again.
D400-14-00
REMOVABLE HEAD COVER
CLEANABLE SCREEN
P/N RS24 (W/O THERMAL)
VANED CHAMBER
A78-1213-01
11
Figure 13. Ion head exploded view:
REMOVABLE
COVER
FOR
CLEANING
REMOVABLE SCREEN
(P/N RS14)
LOCK PRONG
SENSING CHAMBER
A78-2340-00
I56-554-05