[7] FIELD WIRING; INSTALLATION GUIDELINES
All wiring must be installed in compliance with the National Electrical Code
and the local codes having jurisdiction . Proper wire gauges should be used .
The conductors used to connect smoke detectors to control panels and acces-
sory devices should be color-coded to prevent wiring mistakes . Improper con-
nections can prevent a system from responding properly in the event of a fire .
For signal wiring (the wiring between detectors or from detector to auxiliary
devices), it is usually recommended that single conductor wire be no smaller
than 18 gauge . The duct smoke detector terminals accommodate wire sizes up
to 12 gauge . Flexible conduit is recommended for the last foot of conduit; solid
conduit connections may be used if desired .
Duct smoke detectors and alarm system control panels have specifications for
Signaling Line Circuit (SLC) wiring . Consult the control panel manufacturer’s
specifications for wiring requirements before wiring the detector loop .
[7.1] WIRING INSTRUCTIONS
Disconnect power from the communication line before installing the SK-Duct
duct smoke detector .
The SK-Duct detectors are designed for easy wiring . The housing provides a
terminal strip with clamping plates . Wiring connections are made by sliding
the bare end under the plate, and tightening the clamping plate screw . See
Figure 6
below for system wiring .
[7.2] SET THE ADDRESS
Set the desired address on the sensor head code wheel switches on the back
of the sensor head .
[8] VERIFICATION OF OPERATION
[8.1] INSTALL THE COVER
Install the covers making sure that the cover fits into the base groove . Tighten
the seven screws that are captured in the covers . Note that the cover must be
properly installed for proper operation of the sensor .
[8.2] POWER THE UNIT
Activate the communication line on terminals COM + and COM – .
[8.3] DETECTOR CHECK
Standby – If programmed by the system control panel, look for the presence of
the flashing LEDs through the transparent housing cover . The LED will flash
with each communication .
Trouble – If programmed by the system control panel and the detector LEDs
do not flash, then the detector lacks power (check wiring, missing or improp-
erly placed cover, panel programming, or power supply), the sensor head is
missing (replace), or the unit is defective (return for repair) .
[8.4] DUCT SMOKE DETECTOR TEST & MAINTENANCE PROCEDURES
Test and maintain duct smoke detectors as recommended in NFPA 72 . The
tests contained in this manual were devised to assist maintenance personnel
in verification of proper detector operation .
Before conducting these tests, notify the proper authorities that the smoke
detection system will be temporarily out of service . Disable the zone or system
under test to prevent unwanted alarms .
[8.4.1] TEST THE UNIT
1 . M02-04-00 Magnet Test (not included) – This sensor can be functionally
tested with a test magnet . The test magnet electronically simulates smoke
in the sensing chamber, testing the sensor electronics and connections to
the control panel .
2 . Remote Test Accessory – The use of a remote accessory for visible indica-
tion of power and alarm is recommended .
Verify system control panel alarm status and control panel execution of all
intended auxiliary functions (i .e . fan shutdown, damper control, etc .) .
Two LEDs on the sensor are controlled by the panel to indicate sensor
status . Coded signals, transmitted from the panel, can cause the LEDs
to blink, latch on, or latch off . Refer to the control panel technical docu-
mentation for sensor LED operation and expected delay to alarm .
[8.4.2] THE DETECTOR MUST BE RESET BY THE SYSTEM CONTROL PANEL
[8.4.3] SMOKE ENTRY TEST USING AEROSOL SMOKE
This test is intended for low-flow systems (100-500 FPM) . If the air speed is
greater than 500 FPM, use a conventional manometer to measure differential
pressure between the sampling tubes, as described under Measurement Tests
on Page 3 .
Drill a
1
⁄
4
-inch hole 3 feet upstream from the duct smoke detector . With the air
handler on, measure the air velocity with an anemometer . Air speed must be
at least 100 FPM . Spray aerosol smoke* into the duct through the
1
⁄
4
-inch hole
for five seconds . Wait two minutes for the duct smoke detector to alarm . If the
duct smoke detector alarms, air is flowing through the detector . Remove the
duct smoke detector cover and blow out the residual aerosol smoke from the
chamber and reset the duct smoke detector at the panel . Use duct tape to seal
the aerosol smoke entry hole . Remember to replace the cover after the test or
the detector will not function properly .
*Aerosol smoke can be purchased from Home Safeguard Industries at
homesafeguard .com, model 25S Smoke Detector Tester, and Chekkit Smoke
Detector Tester model CHEK02 and CHEK06 available from SDi . When used
properly, the canned smoke agent will cause the smoke detector to go into
alarm . Refer to the manufacturer’s published instructions for proper use of the
canned smoke agent .
CAUTION
Canned aerosol simulated smoke (canned smoke agent) formulas will vary by
manufacturer . Misuse or overuse to these products may have long term adverse
effects on the smoke detector . Consult the canned smoke agent manufacturer’s
published instructions for any further warnings or caution statements .
[9] DETECTOR CLEANING PROCEDURES
Notify the proper authorities that the smoke detector system is undergoing
maintenance, and that the system will temporarily be out of service . Disable
the zone or system undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department .
[9.1] DETECTOR SENSOR
1 . Remove the sensor to be cleaned from the system .
2 . Remove the sensor cover by pressing firmly on each of the four removal
tabs that hold the cover in place .
3 . Vacuum the screen carefully without removing it . If further cleaning is re-
quired continue with Step 4, otherwise skip to Step 7 .
4 . Remove the chamber cover/screen assembly by pulling it straight out .
5 . Use a vacuum cleaner or compressed air to remove dust and debris from
the sensing chamber .
6 . Reinstall the chamber cover/screen assembly by sliding the edge over the
sensing chamber . Turn until it is firmly in place .
7 . Replace the cover using the LEDs to align the cover and then gently pushing
it until it locks into place .
8 . Reinstall the detector .
FIGURE 6. SYSTEM WIRING DIAGRAM FOR SK-DUCT:
HO572-00
COMM.
LINE (+)
UL/FM LISTED
CONTROL
PANEL
1ST
DETECTOR
IN LOOP
2ND
DETECTOR
IN LOOP
COMM.
LINE (–)
COMM.
LINE
HO112-01
FIGURE 7. ROTARY ADDRESS SWITCHES
4
I56-3432-006
04-12
