3. Clean the screen thoroughly with a soft brush or vacu-
um. Replacement screens (RS14) are available.
4. Brush or vacuum the inside of the cover. The cover may
then be blown out with clean, compressed air.
5. Vacuum the sensing chamber before using clean,
compressed air to loosen and blow out any remaining
debris.
6. Press the screen back into the cover.
7. Replace the detector cover onto the sensing chamber.
Rotate it clockwise to lock it into place.
[7.3] 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
LOCK PRONG
REMOVABLE SCREEN
(P/N RS14)
REMOVABLE
COVER
FOR
CLEANING
SENSING CHAMBER
Figure 13. Ion head exploded view:
H0246-00
D400-64-00 10 I56-991-08R
[8] Model DH400ACDCIHT Air Duct Smoke Detector Specifications
Description
HVAC air duct mounted ionization smoke detector for separately powered systems or stand alone systems. Auxiliary
alarm relay contacts provide fan contactor shutdown to prevent HVAC circulation of smoke.
Environmental Limits
Operating Temperature: +32° to +158°F (0° to +70°C)
Storage Temperature: –22° to +158°F (–30° to +70°C)
Humidity: 10% to 93% R.H. non-condensing
Air Velocity: 500 to 4000 Ft/min.
1.5 to 20.3 m/sec.
Test Features
Magnetic test switch, magnetic reset switch, MOD400R test module (optional), RTS451 Remote Test Station (optional).
Mechanical Specifications
Length: 14.5 inches 37 cm
Width: 5 inches
13 cm
Depth (installed): 4 inches
10 cm
Weight: 4 pounds
1.8 kg
Terminals
Captive universal terminal screws with sems plates accept wire sizes of 14 gauge or smaller. The screws can withstand
10 in-lbs of tightening torque without damage.
Accessories
MOD400R Sensitivity Test Module
RA400Z Remote Annunciator
RTS451/RTS451KEY Remote Test Station, test & reset switch with alarm LED
PA400 Piezo Sounder
APA451 Annunciator with piezo, alarm & power LEDs
CRT400 Cover Removal Tool
