System Sensor DNRECL - Manual (Page 4)

-
+
LISTED COMPATIBLE
CONTROL PANEL
OPTIONAL RETURN LOOP
(–) COM LINE
TO REST OF SYSTEM
(+) COM LINE
TO REST OF SYSTEM
SLC
SLC
UNIT 2 UNIT1 UNIT 3
COMM (+) COMM (–
)
(+) OUT COMM (+) COMM (–
)
(+) OUT COMM (+) COMM (–
)
(+) OUT
[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 300 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 DNRECL
duct smoke detector.
The DNRECL 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 on below for system wiring.
1. Wire the detector housing per the wiring diagram, see Figure 5.
2. Install the detector head into the base. Push the detector into the base
while turning it clockwise to secure it in place.
3. Set the desired address using the IR configuration tool (EA–CT).
4. Test the duct detector as described in the Testing section of this manual.
NOTE: When using the EA–CT tool, the address/loop on a duct detector in
sight can be set or changed. However, if the duct detector is being commu-
nicated to as a target (out of sight device) through another device (in sight),
only the address of the target can be changed. Device in sight must be within
30ft. of the EA–CT in order for it to communicate.
CAUTION
Dust covers provide limited protection against airborne dust particles during
shipping. Dust covers must be removed before the detectors can sense smoke.
Remove detectors prior to heavy remodeling or construction.
[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
Before replacing the duct housing cover, check the detector interconnections,
as follows:
A. Functional:
The duct detector head can be functionally tested by using the IR con-
figuration tool (EA-CT). Following the instructions, initiate the detector
test sequence. The detector should initiate a walk test message at the fire
alarm control panel. Refer to the control panel technical documentation
for further information.
B. RTS451/RTS451KEY Remote Test Station:
The RTS451/RTS451KEY Remote Test Station facilitates testing of the
duct detector alarm capability. This duct detector cannot
be reset by the
RTS451/RTS451KEY. It must be reset at the system control panel.
[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 (300-500 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 300 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.
SS-300-019 4 I56-3496-004R
FIGURE 6. SYSTEM WIRING DIAGRAM FOR DNRECL:
HO119-02