System Sensor DH100ACDCLWP - Manual (Page 4)

[5.6] Install The Filters
To install the sampling tube filters, simply push the filters into the
sampling and exhaust tube holes, as shown in
Figure 5.
Figure 5. Sampling tube filter installation:
CAUTION
Filters require periodic cleaning or replacement, depending on the
amount of dust and dirt accumulated. Visually inspect the filters at
least quarterly; inspect them more often if the dust accumulation
warrants it. See Section [6] for more information. For replacement
filters, contact your Innovair distributor. (Exhaust tube/intake tube
filter P/N F36-09-11).
[5.7] Field Wiring Installation Guidelines
All wiring must be installed in compliance with the National Elec-
trical Code and the local codes having jurisdiction. Proper wire
gauges should be used. The conductors used to connect smoke
detectors to control panels and accessory devices should be color-
coded to prevent wiring mistakes. Improper connections can pre-
vent a system from responding properly in the event of a fire.
For signal wiring, (the wiring between interconnected detec-
tors or from detectors to auxiliary devices), it is usually recom-
mended that single conductor wire be no smaller than 18 gauge.
The duct smoke detector terminals accommodate wire sizes up to
12 gauge. In order to achieve NEMA 4 environmental protection,
watertight conduit and fittings must be used when installing the
DH100ACDCLWP.
Smoke detectors and alarm system control panels have specifi-
cations 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 DH100ACDCLWP detectors are designed for easy wiring. The
housing provides a terminal strip with clamping plates. Wiring
connections are made by stripping about
3 ⁄
8
˝ of insulation from
the end of the wire, sliding the bare end under the plate, and
tightening the clamping plate screw.
[5.8] 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].
[5.9] Install The Cover
Install the cover using the six screws that are captured in the hous-
ing cover. Be certain filters are installed as specified in Section
[5.6]. Make sure that the cover fits into the base groove and that
all gaskets are in their proper positions. Tighten the six screws.
[6] Duct Smoke Detector Maintenance & Test Procedures
As recommended in NFPA 90, all smoke detection devices desig-
nated for automatic shutdown shall be tested annually. The tests
in this manual are designed to assist installation and 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. Dis-
able the zone or system under test to prevent unwanted alarms.
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
The DH100ACDCLWP 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 mea-
sure the differential pressure between the two sampling tubes.
The differential pressure should measure at least 0.0015 inches of
water and no more than 1.4 inches of water. Because most com-
mercially available manometers cannot accurately measure very
low pressure differentials, applications 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 Sec-
tion 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 sec-
onds. Wait two minutes for the duct smoke detector to alarm. If
the duct smoke detector alarms, air is flowing through the detec-
tor. Remove the duct smoke detector cover and blow out the re-
sidual 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 several maufacturers, includ-
ing Home Safeguard Industries, Malibu, CA. Phone: 310/457-5813.
[6.1.3] Smoke Entry Test
To determine if smoke is capable of entering the sensing chamber,
visually identify any obstructions. With the cover removed, plug
the exhaust and inlet tube holes to prevent ducted air from carry-
ing 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 Differ-
ential Pressure Transmitter
To verify the air speed of the duct using an anemometer, air veloc-
ity must be at least 100 FPM. Disconnect power and remove cover.
Remove both foam air filters from the inlet and exhaust tubes.
Wire the Dwyer transmitter as shown in
Figure 6. Connect the
leads of the meter to either side of the 1000 Ω 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
across the 1000 Ω resistor (measurement 1), 4.00 volts is typical.
D200-24-00 4 I56-0056-009R
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