Silentknight SK-Duct Addressable Photoelectric Duct Detector User Manual download pdf (Page 2)

[4]DETECTOR INSTALLATION

[4.1]VERIFY DUCT AIR FLOW DIRECTION AND VELOCITY

Model SK-Duct detectors are designed to be used in air handling systems hav-

ing air velocities of 100 to 4000 feet per minute. Duct widths from 6 inches to

12 feet can be accommodated. Be sure to check engineering specifications to

ensure that the air velocity in the duct falls within these parameters. If neces-

sary, use a velocity meter (anemometer) to check the air velocity in the duct.

[4.2]DETERMINE MOUNTING LOCATION AND CONFIGURATION

On ducts wider than 18 inches it is recommended that the detector be

mounted downstream of a bend, obstruction in the duct, or the supply or

return air inlet.

Exception: Installation of duct detectors can be on or within a commercial

packaged rooftop heating and air-conditioning system, fire/smoke dampers

and economizers. They may be mounted in either the supply and/or return air

section as determined by local code.

Once a suitable location is selected, determine if the detector is to be mounted

in a side-by-side “rectangular” configuration or a top-over-bottom “square”

configuration as shown in Figure 2. If mounting in the square configuration,

remove the rear attachment screw, rotate the unit at hinge, and replace the

screw into the new attachment hole as shown in Figure 2. Do NOT remove

the hinge screw during this process. Final installation approval shall be based

upon passing differential pressure and smoke entry tests described in the Mea-

surement Tests section.

[4.3]DRILL THE MOUNTING HOLES

Remove the paper backing from the mounting template supplied. Affix the

template to the duct at the desired mounting location. Make sure the template

lies flat and smooth on the duct.

[4.3.1]FOR RECTANGULAR SIDE-BY-SIDE MOUNTING CONFIGURATION:

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for

the rectangular configuration mounting tabs as shown on mounting template.

Drill pilot holes at target “A” centers and cut two 1.375-inch diameter holes

using a 1

⁄8-inch hole saw or punch. Drill .156-inch diameter holes using a

⁄32-

inch drill at target “B” centers.

[4.3.2]FOR SQUARE TOP-OVER-BOTTOM MOUNTING CONFIGURATION:

Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C” for

the square configuration mounting tabs as shown on mounting template. Drill

pilot holes at target “A” centers and cut two 1.375-inch diameter holes using

a 1

⁄8-inch hole saw or punch. Drill .156-inch diameter holes using a

⁄32-inch

drill at target “C” centers. If desired, drill an additional .156-inch hole at the

location of one of the mounting tabs on the lower housing.

[4.4]SECURE THE DUCT DETECTOR TO THE DUCT

Use two (rectangular configuration) or three (square configuration) of the pro-

vided sheet metal screws to screw the duct detector to the duct.

CAUTION: Do not overtighten the screws.

[5]SAMPLING TUBE INSTALLATION

[5.1]SAMPLING TUBE SELECTION

The sampling tube must be purchased separately. Order the correct length,

as specified in Table 1, for width of the duct where it will be installed. The

sampling tube length must extend at least

⁄3 across the duct width for optimal

performance.

The sampling tube is always installed with the air inlet holes facing into the

air flow. To assist proper installation, the tube’s connector is marked with an

arrow. Make sure the sampling tube is mounted so that the arrow points into

the airflow as shown in Figure 3. Mounting the detector housing in a vertical

orientation is acceptable provided that the air flows directly into the sam-

pling tube holes as indicated in Figure 3. The sampling tube and exhaust tube

can be mounted in either housing connection as long as the exhaust tube is

mounted downstream from the sampling tube.

SK-300-000 2 I56-3432-001R

FIGURE 1. EXPLODED VIEW OF DUCT SMOKE DETECTOR COMPONENTS:

H0569-02

EXHAUST TUBE

SENSOR HEAD

SENSOR MODULE COVER

WIRING COMPARTMENT COVER

WIRING COMPARTMENT

SENSOR MODULE

SAMPLING

TUBE

SOLD

SEPERATELY

REMOVE SCREW AND PIVOT

DETECTOR AS SHOWN BELOW.

REPLACE SCREW

TO SECURE DETECTOR

IN PLACE.

FIGURE 2:

H0550-00

1 2 3 4 5 6

Comments to this Manuals

No comments

Silentknight SK-Duct Addressable Photoelectric Duct Detector User Manual Page 2

Comments to this Manuals

Related products and manuals for Safety Silentknight SK-Duct Addressable Photoelectric Duct Detector