April 2003 76-100016-002
PEGAsys™ LV
3-6
3-3.13 Model DH-2000 Air Duct Housing
The DH-2000 air duct housing is designed for detecting
particles of combustion in air handling systems. Upon
smoke detection, the system can be programmed to con-
trol a variety of devices such as HVAC fans and power
shutdown which can prevent unnecessary damage to a
facility.
The duct housing accepts either the PSD-7152 or CPD-
7052 smoke detectors. A transparent Lexan
®
cover over
the detection chamber allows visual inspection of the duct
detector chamber and the internal smoke detector status.
Sampling of the air in the duct is accomplished through
the use of sampling tubes, which extend into the HVAC
duct.
• Model DH-2000 Air Duct Housing:
P/N 70-403001-100
• Model DH-2000 CPDI Air Duct Housing with Ion De-
tector: P/N 70-403001-052
• Model DH-2000 PSDI Air Duct Housing with Photo
Detector: P/N 70-403001-152
Refer to DH-2000 Installation Manual (P/N 06-235398-001)
for further details.
Figure 3-11. DH-2000 Air Duct Housing
3-3.14 Loop Isolator Devices
The SmartOne series of loop devices offer optional loop
isolation, which protects the loop from wire-to-wire short
conditions (NFPA 72, Style 7). The isolators will open the
loop between two isolators in the presence of a short cir-
cuit condition, thus allowing the remainder of the loop to
operate normally. However, a trouble indication for the de-
vices affected by the isolation will be created on the panel.
The isolators will return to normal operation when the short
condition has been removed from the affected wires.
The loop isolators are offered in three package styles:
• Stand-alone style. Housed in a single gang elec-
trical box arrangement.
• 6-inch Detector Base Mount. Allows the unit to be
mounted behind a smoke detector in the 6-inch
detector base.
• Direct mount. Mounts directly onto the RX/TX mod-
ule.
The single gang mount unit includes intrinsic status LEDs
which allow the device to indicate in which direction the
short condition is being detected. In normal standby mode,
the LED will be extinguished and in activated condition,
the LED will be on continuously.
• Loop Isolator RX/TX mount: P/N 74-200012-001
• Loop Isolator Stand-alone (Single Gang):
P/N 74-200012-002
• Loop Isolator 6-inch detector base mount:
P/N 74-200012-004
LOOP ISOLATOR
RX/TX
KIDDE-FENWAL, INC.
ASHLAND, MA 01721
SHORT-1 SHORT-2
DS2 DS1
J1
FOR MODULE INSTALL.
P/N 74-200016-001
INSTALLATION MANUAL
REFER TO
PROCEDURES
Laboratories Inc.
Underwriters
R
LISTED
R
Figure 3-12. Loop Isolator, RX/TX Mount
Figure 3-13. Loop Isolator, Stand-Alone
Laboratories
Underwriters
R
LISTED
Figure 3-14. Loop Isolator, 6-inch Detector Base Mount
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