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F300-28-00 

I56-1974-006R

[4.2] Installation For Ducts More Than 8 Feet (2.4m) Wide

NOTE:

 To install sampling tubes in ducts more than 8 feet (2.4m) wide, work must be performed inside the air duct. Sampling of air in 

ducts wider than 8 feet (2.4m) is accomplished by using the ST-10 sampling tube. If the tube is shorter than the width of the air duct, 
install the end cap into the sampling tube as shown in Figure 4 and support the end opposite the duct smoke detector.

Install the sampling tube as follows:

1.  Drill a 

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˝ (19mm) hole in the duct directly opposite the hole already drilled for the sampling tube. Make sure the hole is 1˝ to 2˝ 

(25 to 50mm) below the inlet hole on the opposite side of the duct to allow for moisture drainage.

2.  Slide the sampling tube with the flange into the housing bushing that meets the air flow first. Position the tube so that the arrow 

points into the air flow. Secure the tube flange to the housing bushing with two #6 self-tapping screws.

3.  From inside the duct, couple the other sections of the sampling tube to the section already installed using the 

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˝ conduit fittings 

supplied. Make sure that the holes on both of the sampling tubes are lined up and facing into the air flow.

4.  Trim the end of the tube protruding through the duct so that 1˝ to 2˝ (25 to 50mm) of the tube extend outside the duct. Plug this end 

with the end cap and tape closed any holes in the protruding section of the tube. Be sure to seal the duct where the tube protrudes.

NOTE:

 An alternate method to using the ST-10 is to use two ST-5 sampling tubes. Remove the flange from one of the tubes and install 

as described above. After the installation, use electrical tape to close off some of the sampling holes so that there are a total of 10 to 
12 holes spaced as evenly as possible across the width of the duct.

NOTE:

 Air currents inside the duct may cause excessive vibration, especially when the longer sampling tubes are used. In these cases 

a 3˝ (75mm) floor flange (available at most plumbing supply stores) may be used to fasten the sampling tube to the other side of the 
duct. When using the flange/connector mounting technique, drill a 1˝ to 1

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˝ (25 to 32mm) hole where the flange will be used.

[5] Install The Filters 

To install the sampling tube filters, simply push the filters into the sampling and exhaust tube holes, as shown in Figure 6. If a metal 
sampling tube is used, install the filters over the tube end.

[6] 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 accessory devices should be color-coded to 
prevent wiring mistakes. Improper connections can prevent a system from responding properly in the event of a fire.

CAUTION

Filters require periodic cleaning or replacement, depending on the amount of dust and dirt accumulated. Visually inspect the filters at 
least quarterly; inspect them more often if the dust accumulation warrants it. See Section [9.1.2] for more information. Replacement 
filters can be ordered (filter P/N F36-09-11).

For signal wiring, (the wiring between detectors or from detectors to auxiliary devices), it is usually recommended that single conduc-
tor wire be no smaller than 18 gauge. The duct smoke detector terminals accommodate 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 Signaling-Line Circuit (SLC) wiring. Consult the control panel 
manufacturer’s specifications for wiring requirements for the particular model control panel being used before wiring the detector loop.
The D350RPL detector is designed for ease of wiring. The housing provides a terminal strip with clamping plates.
Wiring connections are made by stripping about 

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˝ (9mm) of insulation from the end of the wire, sliding the bare end under the plate, 

and tightening the clamping plate screw. 
Two  LEDs  on  each  duct  smoke  detector  may  light,  if  pro-
grammed  by  the  system  control  panel,  to  provide  a  local, 
visible  indication.  Remote  LED  annunciator  capability  is 
available as an option. Each duct smoke detector can only be 
wired to one remote accessory.

Figure 6. Sampling tube filter installation:

H0138-00

Summary of Contents for Fire-Lite Alarms D350RPL

Page 1: ...m control panel to provide a local alarm indication There is also a remote alarm output for use with auxiliary devices The D350RPL has remote test capability with the RTS451 RTS451KEY Remote Test Station The D350RPL incorporates a cover tamper feature When the cover is removed for more than 20 minutes the unit loses communication at the panel a trouble is indicated at the panel and the alarm relay...

Page 2: ...but less than 8 feet 2 4m wide 3 Step 4 2 Installation for ducts more than 8 feet 2 4m wide 4 Step 5 Install the filters 4 Step 6 Field wiring 4 Step 7 Perform detector check 5 Step 8 Install the cover 5 Step 9 Detector Maintenance and Test Procedures 5 1 Verify Duct Air Flow Direction And Velocity The D350RPL duct smoke detector is designed to be used in air handling systems having air velocities...

Page 3: ...rom the detector If the tube is shorter than the width of the air duct install the end cap into the sampling tube as shown in Figure 4 Sampling tubes over 3 ft 0 91m long must be supported at the end opposite the duct smoke detector 2 Slide the tube into the housing bushing that meets the air flow first Position the tube so that the arrow points into the air flow as shown in Figure 4 3 Secure the ...

Page 4: ...4 25 to 32mm hole where the flange will be used 5 Install The Filters To install the sampling tube filters simply push the filters into the sampling and exhaust tube holes as shown in Figure 6 If a metal sampling tube is used install the filters over the tube end 6 Field Wiring Installation Guidelines All wiring must be installed in compliance with the National Electrical Code and the local codes ...

Page 5: ...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 9 1 4 or 2 the use of aerosol smoke per section 9 1 2 9 1 2 Air Flow Test using Aer...

Page 6: ...to verify correct operation of the system Remove the detector board to cause a trouble condition locally and at the system control panel Figure 8 Procedure for verifying air flow F300 28 00 6 I56 1974 006R HIGH LOW 9 VOLT BATTERY 9 VOLT BATTERY 9 VOLT BATTERY TO SAMPLING TUBE TO EXHAUST TUBE DIFFERENTIAL PRESSURE TRANSMITTER MODEL 607 01 15 TO 36 VDC SUPPLY 1000 OHM 5 1 WATT RESISTOR VOLT METER FL...

Page 7: ...be out of service Disable the device or system undergoing maintenance to prevent unwanted alarms and possible dispatch of the fire department 9 3 Maintenance of Duct Smoke Detectors 9 3 1 Air Filters 1 Turn off power to the system 2 Remove and inspect sampling tube filters 3 If filters are heavily coated with dirt replace them with new filters p n F36 09 11 If they are not heavily coated use a vac...

Page 8: ...ver there is no guarantee that interfer ence will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation be...

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