System Sensor INNOVAIR DH100ACDCLWP - Manual (Page 5)

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 DH100ACDCLWP is designed to operate over an
extended air speed range of 100 to 4000 FPM. To verify suf-
ficient sampling of ducted air, turn the air handler on and
use a manometer to measure 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 commercially
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 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 han-
dler 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 min-
utes 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 several maufacturers, including
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 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
To verify the air speed of the duct using an anemometer, air
velocity 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. Using flexi-
ble tubing and rubber stoppers, connect the HIGH side of
the transmitter to the sampling tube of the duct smoke
detector housing, and the LOW side of the transmitter to the
exhaust tube of the duct smoke detector housing. Measure
and record the voltage drop across the 1000 Ω resistor
(measurement 2). Subtract the voltage recorded in meas-
urement 1 from the voltage recorded in measurement 2. If
the difference is greater than 0.15 volts, there is enough air
flow through the duct smoke detector for proper operation.
Once readings are complete, reinsert both filters and rein-
stall cover. Reconnect power.
Figure 6. Procedure for verifying air flow:
[6.1.5] Filter Replacement
The filters do not substantially affect smoke performance
even when up to 90% of the filter is clogged. Quarterly
visual inspection usually suffices to determine whether the
filters should be replaced because only a high percentage of
contamination affects performance. If further testing is
required, compare differential pressure readings with and
without the filters installed. If the difference exceeds 10%
replace the filters. In no case should the pressure differen-
tial fall below 0.0015 inches of water.
[6.2] Standby, Alarm and Sensitivity Tests
The cover must be removed to perform these tests. The use
of a remote accessory for visible indication of power and
alarm is recommended.
[6.2.1] Standby And Trouble
Standby—Look for the presence of the flashing green LED. The
LED should flash approximately every 10 seconds.
Trouble— If the detector LED does not flash, then the detector
lacks power (check wiring, panel, or power supply),
the detector board is missing (replace), the cover
has been missing or not secured properly for more
than 7 minutes (secure cover properly), or the unit
is defective (return for repair).
Test— The trouble condition can be caused intentionally to
verify correct operation of the system. Remove the
DIFFERENTIAL
PRESSURE
TRANSMITTER
MODEL #607-01
HIGH LOW
TO SAMPLING TUBE
TO EXHAUST TUBE
VOLT METER
FLUKE MODEL 87
OR EQUIVALENT
1000 OHM 5% 1 WATT RESISTOR
9 VOLT
BATTERY
9 VOLT
BATTERY
9 VOLT
BATTERY
15 TO 36VDC
SUPPLY
D200-24-00 5 I56-0056-07R