System Sensor DH100LP Wiring Instructions, Perform Detector Check, Install The Cover

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

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