System Sensor INNOVAIR DH100LP - Manual (Page 5)

For signal wiring, (the wiring between interconnected
detectors or from detectors to auxiliary devices), it is usu-
ally recommended that single conductor wire be no smaller
than 18 gauge. The duct smoke detector terminals accom-
modate wire sizes up to 12 gauge. The last foot of conduit
should be flexible conduit (available in electrical supply
houses), which facilitates easier installation and puts less
strain on the conduit holes in the housing. Solid conduit
connections may be used if desired.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the particular model control
panel being used before wiring the detector loop.
Wiring Instructions
The DH100LP detectors are designed for easy wiring. The
housing provides a terminal strip with clamping plates.
Wiring connections are made by stripping about 3/8-inch
of insulation from the end of the wire, sliding the bare end
under the plate, and tightening the clamping plate screw.
The DH100LP duct smoke detector is designed to operate
with 12 or 24 VDC UL listed 2-wire compatible control pan-
els. Alarm current must be limited by the control panel to
100mA or less. An example of a UL listed compatible con-
trol panel is the Fire-Lite model Sensiscan 1000 using zone
card ANC-2 and compatibility identification “A”. Install per
installation instruction S1000/801. A maximum of 20 detec-
tors may be installed per zone.
[5.7] Perform Detector Check
1. Perform STANDBY AND TROUBLE TEST per Section
[6.2.1].
2. Perform MAGNET TEST per Section [6.2.2.1]. The
RTS451 test of Section [6.2.2.2] may substitute for this
requirement.
3. Perform AIR FLOW TEST per Section [6.1.1].
4. Perform SMOKE RESPONSE TEST per Section [6.1.2].
5. Perform SENSITIVITY TEST per Section [6.2.3].
[5.8] Install The Cover
Install the cover using the six screws that are captured in
the housing cover. Be certain filters are installed as speci-
fied in Section [5.5]. Make sure that the cover fits into the
base groove and that all gaskets are in their proper posi-
tions. Tighten the six screws.
[6] Duct Smoke Detector Maintenance And Test
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.
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
The DH100LP is designed to operate over an extended air
speed range of 100 to 4000 FPM. To verify sufficient sampling
of ducted air, turn the air handler on and use a manometer
to measure the differential pressure between the two sam-
pling tubes. The differential pressure should measure at least
0.0015 inches of water and no more than 1.2 inches of water.
Because most commercially available manometers cannot
accurately measure very low pressure differentials, applica-
tions with less than 500 FPM of duct air speed may require
one of the following: 1) the use of a current-sourcing pressure
transmitter (Dwyer Series 607) per Section 6.1.4 or; 2) the use
of aerosol smoke per section 6.1.2.
[6.1.2] Air Flow Test using Aerosol Smoke
This test is intended for low-flow systems (100-500FPM).
If the air speed is greater than 500FPM, use a conventional
manometer to measure differential pressure between the
sampling tubes as described in 6.1.1. Drill a 1⁄4” 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” 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. Use duct tape to seal the aerosol
smoke entry hole.
*Aerosol smoke can be purchased from Home Safeguard Industries,
Malibu, CA. Phone: 310/457-5813.
[6.1.3] Smoke Entry Test
To determine if smoke is capable of entering the sens-
ing chamber, visually identify any obstructions. Plug the
exhaust and inlet tube holes to prevent ducted air from
carrying smoke away from the detector head, then blow
smoke such as cigarette, cotton wick, or punk directly at
the head to cause an alarm. REMEMBER TO REMOVE THE
PLUGS AFTER THIS TEST, OR THE DETECTOR WILL NOT
FUNCTION PROPERLY.
[6.1.4] Air Flow Test using Dwyer Series 607
Differential Pressure Transmitter
Verify the air speed of the duct using an anemometer. Air
speed must be at least 100 FPM. Wire the Dwyer transmit-
ter as shown in Figure 7. Connect the leads of the meter
to either side of the 1000Ω resistor. Allow unit to warm up
for 15 seconds. With both HIGH and LOW pressure ports
open to ambient air, measure and record the voltage drop
acrossthe 1000Ω resistor (measurement 1), 4.00 volts is
typical. Using flexible tubing and rubber stoppers, connect
the HIGH side of the transmitter to the sampling tube of
D200-15-00 5 I56-0083-07R