24V
120
VAC
220/240
VAC
1
2
12
13
14
AVAILABLE POWER INPUTS
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
15
16
17
18
19
20
N.C.
C.
N.O.
N.O.
C.
N.C.
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
ALARM INITIATION CONTACTS
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
REMOVED, AND DURING RESET. OPEN CONTACTS
SIGNAL TROUBLE CONDITION TO PANEL.
9
8
5
(+) ALARM SIGNAL
AUDIBLE PIEZO ALERT WITH ALARM AND
POWER (TROUBLE) LEDS. FOR STAND ALONE
APPLICATIONS ONLY. APA451 RECOMMENDED
FOR COMPLIANCE TO NFPA 90A. LOCATE IN
NORMALLY OCCUPIED AREA OF PREMISES.
DH400ACDCIHT
DUCT DETECTOR
SEE SPECIFICATIONS FOR
ADDITIONAL POWER
SUPPLY INFORMATION.
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
MANUFACTURER’S
INSTALLATION INSTRUCTIONS
OR CONTACT MANUFACTURER.
TROUBLE CONTACT RATING
0.3A @ 32 VAC/DC
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50-60 HZ,
120 VAC 50-60 HZ, OR
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
ALARM AUXILIARY CONTACT RATINGS
10A @ 30 VDC RESISTIVE
10A @ 250 VAC
500mA MINIMUM @ 24 VDC
NOT INTENDED FOR CONNECTION
TO CONTROL PANELS.
ALARM INITIATION CONTACT RATING
2.0A @ 30 VAC/DC (0.6 POWER FACTOR)
TROUBLE CONTACTS CLOSED IN STANDBY AND ALARM.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER
IS REMOVED, AND DURING RESET. OPEN CONTACTS
EXTINGUISH OPTIONAL APA451 GREEN “POWER” LED
TO INDICATE TROUBLE CONDITION.
(–) AUX POWER
(+) AUX POWER
TROUBLE
CONTACTS
APA451
N.O.
6
7
10
11
COMMON
FIELD
INSTALLED
JUMPER
POWER
3
GRN.
RED
1
2
ALARM
H0241-00
Figure 8. Wiring diagram for duct detector systems equipped without a control panel (see Figure 8 for
wiring of additional optional accessories):
D400-64-00 7 I56-991-08R
