System Sensor DNRW - Manual (Page 4)

[6.2]LOW fLOW 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 transmitter as shown in Figure 5. 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 across the 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 the duct smoke detec-
tor 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
1000Ω resistor (measurement 2). Subtract the voltage recorded in measure-
ment 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.
[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 DNRW
duct smoke detector.
The DNRW detectors are designed for easy wiring. The housing provides a ter-
minal 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 on 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.
fIgURE 7. ROTARy ADDRESS SWITChES
Note: Some panels support extended addressing. In order to set the sensor
above the address number 99 on compatible systems, carefully remove the
stop on the left hand rotary switch with pliers as shown in Figure 7.
NOTE: Verify sensor cover gasket is properly seated on cover prior to cover
installation
[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 improperly
placed cover, panel programming, or power supply), the sensor head is miss-
ing (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 function-
ally tested with a test magnet. The test magnet electronically simulates
smoke in the sensing chamber, testing the sensor electronics and connec-
tions to the control panel.
2. Remote Test Accessory – The use of a remote accessory for visible
indication 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 RESPONSE TEST
To determine if smoke is capable of entering the sensing chamber, visually
identify any obstructions. Close cover tamper terminals on sensor side of
housing to ensure communication to panel. Plug the exhaust and sampling
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.
[8.4.4]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 home-
safeguard.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. Re-
fer to the manufacturer’s published instructions for proper use of the canned
smoke agent.
SS-300-018 4 I56-3371-007R
fIgURE 6. SySTEM WIRINg DIAgRAM fOR DNRW:
HO572-00
COMM.
LINE (+)
UL/FM LISTED
CONTROL
PANEL
1ST
DETECTOR
IN LOOP
2ND
DETECTOR
IN LOOP
COMM.
LINE (–)
COMM.
LINE
BREAKAWAY STOP
HO112-00