System-sensor DH100LP User Manual download pdf (Page 5)

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

/8˝ of in-

sulation from the end of the wire, sliding the bare end un-

der 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 sam-

pling of ducted air, turn the air handler on and use a manom-

eter 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 1.2 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

⁄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

⁄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 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 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. Plug the ex-

haust 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 FUNC-

TION PROPERLY.

[6.1.4] Air Flow Test using Dwyer Series 607 Differ-

ential 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

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 detector housing, and the LOW side of the

transmitter to the exhaust tube of the duct smoke detec-

tor housing. Measure and record the voltage drop across

the 1000Ω resistor (measurement 2). Subtract the voltage

recorded in measurement 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.

D200-15-00 5 I56-0083-009R

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System-sensor DH100LP User Manual Page 5

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