System Sensor DH500ACDC Contents Of The Duct Detector Housing Kit, Installation Sequence, Page

Figure 1:

CONDUIT HOLES	DUCT DETECTOR
	HOUSING

FOAM	INLET SAMPLING TUBE
GASKETS	(SUPPLIED SEPARATELY)

TUBE

END

PLUG

See Note 1 below for inlet sampling tube and detector supply information.

O-RINGS

DETECTOR BASE

HOUSING

MOUNTING SCREWS

EXHAUST

FILTER ADAPTER

DETECTOR HEAD

(SUPPLIED SEPARATELY)

SAMPLING TUBE

PC BOARD

INSULATOR

DUCT DETECTOR

COVER

SAMPLING TUBE

MOUNTING

SCREWS

TEST MAGNET

FILTERS

H0309-00

The DH500ACDCs are built to operate on 120/240 VAC or 24 VAC/DC. Two form-C (SPDT) relay contacts are avail- able for control purposes. Two LEDs on each detector latch on to provide a local alarm indication. Remote alarm indi- cation is made possible by using the auxiliary alarm output (see Figure 5). The duct detector can be tested and alarm can be reset by using the correct respective code commands from the panel. See panel instructions for details.

Contents Of The Duct Detector Housing Kit

The DH500ACDC Air Duct Detector Housings consist of the following items: (See Figure 1.)

1.Complete housing base and cover assembly.

2.Two #10 sheet metal mounting screws.

3.Two sampling tube filters.

4.One test magnet.

5.Drilling template.

6.Two 5/16-inch O-rings.

7.Two foam gaskets.

8.Four #6 self-tapping mounting screws for the sampling tube.

9.One filter adapter.

10.One inlet tube end plug.

11.Two #10 speed nuts.

NOTE: The inlet sampling tube must be ordered separately. It must be the correct length for the width of the duct where it will be installed. See Table 1 to determine the inlet tube required for different duct widths. A smoke detector head (1551 ionization or 2551 for photoelectronic) must be ordered separately.

Installation Sequence		Page
Step 1. Verify duct air flow direction and velocity		............2
Step 2. Drill the mounting holes		2
Step 3. Mount duct housing		3
Step 4. Install the inlet tube		3
Step 5. Complete the field wiring		5
Step 6.	Install the filters	7
Step 7.	Perform detector check	7
Step 8.	Install the cover	9
Step 9.	Perform the final system check (Testing)	9

Step 1. Verify Duct Air Flow Direction And Velocity The DH500ACDCA is designed to be used in air handling systems having air velocities up to 500 feet per minute. Be sure to check engineering specifications to ensure that the air velocity in the duct falls within these parameters. If necessary, use a velocity meter to check the air velocity in the duct.

Step 2. Drill The Mounting Holes

Remove the paper backing from the drilling template. Affix the template to the air duct at the desired mounting loca- tion. Make sure the template lies flat and smooth on the air duct. Center punch hole targets and remove the template. Drill the holes as indicated on the template. Slide the two speed nuts over the two small holes (Hole A) next to the sampling tube bushing holes (Hole B) previously drilled in the duct. (See Figure 2.)

Location of detectors mounted in or on air ducts should be at least six duct widths downstream from any duct openings, deflection plates, sharp bends, or branch con- nections.

D500-07-00 2 I56-432-11R