System Sensor DH400ACDCP - Manual (Page 10)

[7.2] Photo Heads
1. Remove the detector cover by inserting a small bladed
screwdriver into the slot located 90 degrees from the
field test port. Rotate the cover counterclockwise to re-
move (see Figure 13).
2. 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 (RS24) are available.
3. Vacuum the photo chamber. Use clean compressed air
to blow it clean.
4. Replace the screen by aligning the arrow on top with
the field test port on the detector. Press the screen into
place. It should fit tightly on the chamber.
5. Replace the detector cover and rotate it clockwise to
lock it in place.
[7.4] Reinstallation
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check, Section [5.7].
4. Notify the proper authorities testing has been completed
and the smoke detector system is back in operation.
DETECTOR
HEAD
TEST COIL
Figure 12. RTS451/RTS451KEY test coil installation:
H0245-00
D400-13-00 10 I56-0555-010R
Sensor
Cover
Sensing
Chamber
Cover and
Screen
Cover
Removal
Tabs Sensing
Chamber
Optional
Thermistors
(2151T only)
Figure 13. Photo head exploded view:
C0892-00