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 install the filters.
4.Remove the detector from the housing. (See Figure 8.)
Photo Units
5.Remove the detector cover by inserting a
6.Lift the screen from the photo chamber. Vacuum the screen and cover before using clean, compressed air to loosen and blow out any remaining debris (replacement screens are available, part no. RS24).
7.Vacuum the photo chamber. Then, use clean compressed air to blow it clean.
8.Replace the screen by aligning the arrow on top with the test slot in the base of the detector. Press the screen into place. It should fit tightly in the chamber.
Ion Units
9.See Figure 11. Remove the cover and screen assembly by depressing the three lock prongs on the top of the cover and rotating the cover counterclockwise. The CRT400 Cover Removal Tool makes cover removal easier.
10.Carefully pull the screen out of the cover.
11.Clean the screen thoroughly with a soft brush or vacu- um cleaner (replacement screens, part no. RS14).
12.Brush or vacuum the inside of the cover. The cover may then be blown out using clean compressed air.
13.Vacuum the sensing chamber before using clean, compressed air to loosen and blow out any remaining debris.
14.Press the screen back into the cover.
15.Replace the detector cover on the sensing chamber. Rotate it clockwise to lock it in place.
Both Types Of Units
16.Reinstall the detector in its housing.
17.Restore system power.
18.Put detector into alarm using appropriate method described in STEP 7.
Perform Detector Check
19.Notify the proper authorities that testing has been
completed and the smoke detector system is back in oper- ation.
20.Other checks that should be made during maintenance procedures:
—Holes or cracks in duct work near vicinity of detec- tor.
—Air leaks where detector housing or sampling tubes are attached to duct.
—Dust accumulations in or on sampling tubes.
—Wiring terminal screw tightness.
Figure 10. Photo head exploded view: | Figure 11. Ion head, exploded view: |
REMOVABLE HEAD COVER
REMOVABLE
COVER
FOR
CLEANING
TEST SLOT
| REMOVABLE SCREEN |
| (P/N RS14) |
CLEANABLE SCREEN |
|
P/N RS24 (W/O THERMAL) | LOCK PRONG |
| SENSING CHAMBER |
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
9 |
