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DH400P
User Manual
16 pgs269.56 Kb0

System Sensor DH400P User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS
DH400 Air Duct Smoke Detector
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read System Sensor’s Guide for Proper Use of Smoke Detectors in Duct Applications (I56-473-XX),
which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available from System Sensor. NFPA Standards 72 and 90A should also be referenced for de­tailed information.
NOTICE: This manual should be left with the owner/user of this equipment.
IMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. The detector should be cleaned at least once a year.
Table of Contents Page
[1] General Description 1 [2] Exploded View of Duct Detector Components 2 [3] Contents of the Duct Detector Kit 2 [4] Limitations of Duct Detectors 2 [5] Installation Sequence 2 [6] Duct Detector Maintenance and Test Procedures 8 [7] Detector Cleaning Procedures 10 [8] Specifications 12 Warranty 13 Detector Test Log 16
List Of Tables And Figures Page
Fig. 1: Duct Detector Exploded View 2 Fig. 2: Installation of Sampling Tube Gaskets 3 Fig. 3: Mounting Location of Speed Nuts 3 Table 1: Inlet Sampling Tube Selection 3 Fig. 4: Inlet Sampling Tube 4 Fig. 5: Sampling Tube Mounting Configurations 4 Fig. 6: System Wiring Diagram (2-wire) 6 Fig. 7: Wiring Diagram for Remote Test Station 7 Fig. 8: Sampling Tube Filter Installation 8 Fig. 9: Testing Detector Alarm 9 Fig. 10: Detector Head Removal 9 Fig. 11: RTS451/RTS451KEY Test Coil Installation 10 Fig. 12: Photo Head Exploded View 11 Fig. 13: Ion Head Exploded View 11
[1] General Description
An HVAC system supplies conditioned air to virtually every area of a building. Smoke introduced into this air duct sys­tem will be distributed to the entire building. Smoke detec­tors designed for use in air duct systems are used to sense the presence of smoke in the duct.
Model DH400 Air Duct Smoke Detectors are supplied with System Sensor’s model 1451DH ionization detector heads or model 2451 photoelectronic detector heads. These two principle smoke detection methods are combined with an efficient housing design that samples air passing through a duct and allows detection of a developing hazardous condi­tion. When sufficient smoke is sensed, an alarm signal is initiated at the fire control panel monitoring the detector, and appropriate action can be taken to shut off fans, blow­ers, change over air handling systems, etc. These actions can facilitate the management of toxic smoke and fire gases throughout the areas served by the duct system.
DH400 detectors are designed to operate with 12 or 24 VDC UL listed compatible 2-wire control panels. Alarm current must be limited to 100mA or less by the control panel. Aux­iliary relay contacts for control purposes are not available for use with the DH400. Control must initiate from the con­trol panel.
For testing, the alarm can be enabled by a magnet activated test switch, by insertion of a calibrated test card into the sens­ing chamber (photoelectronic version only), or by the op­tional remote test station. The duct smoke detectors latch into alarm state when alarm occurs. LEDs on each detector illumi­nate to provide local alarm indication, and the optional RA400Z accessory offers remote LED annunciation capability. The DH400 duct detector must be reset by the control panel.
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[2] Figure 1: Exploded View Of Duct Detector Components
CONDUIT HOLES
FOAM
GASKETS
TUBE PLUG
DETECTOR BASE
HOUSING
MOUNTING SCREWS
FILTER ADAPTER
TEST MAGNET
END
INLET SAMPLING TUBE
(SUPPLIED SEPARATELY)
O-RINGS
EXHAUST
DETECTOR HEAD
(SUPPLIED SEPARATELY)
SAMPLING TUBE
FILTERS
[3] Contents Of The Duct Detector Kit
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 rubber tube bushing seals
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
DUCT DETECTOR
HOUSING
TERMINAL STRIP
DUCT DETECTOR
COVER
SAMPLING TUBE
MOUNTING
SCREWS
A78-2093-00
WARNING
Frequently, fire situations may cause an interruption of power. The system safeguards should be discussed with your local fire protection specialist.
WARNING
This device will not sense smoke unless the ventilation sys­tem is operating.
WARNING
This detector housing is not a weatherproof device, there­fore it should not be installed above the building roof line and must be protected from the elements.
NOTE: The inlet sampling tube must be ordered sepa-
rately. It must be the correct length for the width of the duct where it will be installed. See Table 1 on page 4 to determine the inlet tube required for dif­ferent duct widths.
[5] Installation Sequence
Step Page
[5.1] Verify duct air flow direction and velocity 2 [5.2] Drill the mounting holes 3 [5.3] Secure the detector housing to the duct 3 [5.4] Install the sampling tube 3
[4] Limitations Of Duct Detectors
WARNING
[5.5] Complete the field wiring 5 [5.6] Install the filters and check pressure differential 8 [5.7] Perform detector check 8
The National Fire Protection Association has established
[5.8] Install the cover 8
that DUCT DETECTORS MUST NOT BE USED AS A SUB­STITUTE FOR OPEN AREA DETECTOR PROTECTION as a means of providing life safety. Nor are they a substitute for early warning in a building’s regular fire detection system.
[5.1] Verify Duct Air Flow Direction And Velocity
Model DH400 detectors are designed to be used in air han­dling systems having air velocities of 500 to 4000 feet per minute. Be sure to check engineering specifications to en-
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sure that the air velocity in the duct falls within these pa­rameters. If necessary, an Alnor Model 6000-P velocity meter or equivalent, may be used to check the air velocity in the duct.
[5.2] 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. Center punch holes A and B. 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 3.)
[5.4] Install The Inlet
The inlet tube (shown in Figure 4) is identified by a series of air inlet holes on the tube. This 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 exhaust tube is molded onto the base of the duct housing, and the A2440-00 Exhaust Tube Extension is available as an acces­sory in those cases where the molded exhaust port does not extend at least 2 inches into the duct.
[5.3] Secure The Detector Housing To The Duct
Remove the duct housing cover. Slide the foam gaskets over the tube bushings as shown in Figure 2. Make sure the two small holes in the gaskets line up with the two base mount­ing holes. Put one 5/16-inch O-ring over each of the two #10 sheet metal screws. Use the two sheet metal screws to screw the detector housing to the duct. CAUTION: Do not overtighten the screws.
Figure 2. Installation of foam gaskets over sampling tube bushings:
DUCT DETECTOR
HOUSING
EXHAUST TUBE
(EXTENSION BUSHING)
FOAM GASKETS
SCREW HOLES FOR ATTACHING DETECTOR HOUSING TO DUCT
A78-2045-00
MOUNTING
SCREWS
O-RINGS
INLET SAMPLING
TUBE BUSHING
The inlet tube is always installed in the centermost housing bushing, with the air inlet holes facing into the air flow. To assist proper installation, the tube’s mounting flange is marked with arrows. Make sure the inlet tube is mounted so that the arrows point into the air flow. Figure 5 shows the various combinations of tube mounting configurations with respect to air flow. Mounting the detector housing in a vertical orientation is acceptable, provided that the air flows directly into the sampling tube holes as indicated in Figure 4.
Table 1. Inlet tubes required for different duct widths:
Outside Duct Width Inlet Tube Required
1 to 2 ft. ST-1.5 2 to 4 ft. ST-3 4 to 8 ft. ST-5
8 to 12 ft. ST-10
Figure 3. Speed nut mounting location:
HOLE B
HOLE A
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DUCT WALL
SPEED
NUT
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Figure 4. Air duct detector inlet sampling tube:
FLANGE
AIR HOLES
ARROWS
MUST FACE
INTO AIR FLOW
Figure 5. Tube mounting configurations with varying air flow direction:
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
AIR FLOW
DIRECTION
DUCT DETECTOR HOUSING
EXHAUST
TUBE
EXHAUST
TUBE
INLET TUBE
INLET TUBE
AIR FLOW DIRECTION
AIR FLOW
DIRECTION
DUCT DETECTOR HOUSING
EXHAUST
TUBE
AIR FLOW
DIRECTION
INLET TUBE
INLET TUBE END PLUG
A78-2047-00
DUCT DETECTOR HOUSING
AIR FLOW
DIRECTION
[5.4.1] Installation For Ducts Less Than 8 Feet Wide
1. If the tube is longer than the width of the air duct, drill a 3/4-inch hole in the duct directly opposite the hole al­ready cut for the inlet tube. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4. Sampling tubes over 3 ft. long must be supported at the end opposite the duct detector.
2. Slide the tube into the centermost housing bushing. Po­sition the tube so that the arrows point into the air flow.
3. Secure the tube flange to the housing bushing with two #6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. If there are more than 2 holes in the section of the tube ex­tending out of the duct, select a different length using Table 1. Otherwise, trim the end of the tube protruding through the duct so that 1 to 2 inches of the tube extend outside the duct. Plug this end with the end plug and
DUCT DETECTOR HOUSING
EXHAUST
TUBE
INLET TUBE
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tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.
WARNING
In no case should more than 2 air inlet holes be cut off the tube. There must be a minimum of 10 holes in the tube ex­posed to the air stream.
[5.4.2] Installation For Ducts More Than 8 Feet Wide
NOTE: To install inlet tubes in ducts more than 8 feet
wide, work must be performed inside the air duct. Sampling of air in ducts wider than 8 feet is accom­plished by using the ST-10 inlet sampling tube. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4 and support the end opposite the duct de­tector.
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Install the inlet tube as follows:
1. Drill a 3/4-inch hole in the duct directly opposite the
hole already drilled for the inlet tube.
2. Slide the inlet tube with the flange into the centermost
housing bushing. Position the tube so that the arrows point 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 section of the in-
let tube to the section already installed using the 1/2­inch conduit fitting supplied. Make sure that the holes on both of the air inlet 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 inches of the tube extend outside the duct. Plug this end with the end plug and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.
NOTE: An alternate method to using the ST-10 is to use
two ST-5 inlet 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.
[5.5] Field Wiring 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.
For signal wiring, (the wiring between interconnected de­tectors or from detectors to auxiliary devices), it is usually recommended that single conductor wire be no smaller than 18 gauge. The duct detector terminals accommodate wire sizes up to 14 gauge. The last foot of conduit should be flexible steel 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.
NOTE: Air currents inside the duct may cause excessive
vibration, especially when the longer sampling tubes are used. In these cases a 3 inch 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 inch to 1-1/4 inch hole where the flange will be used.
[5.4.3] Modifications of Inlet Sampling Tubes
There may be applications where duct widths are not what is specified for the installation. In such cases, it is permis­sible to modify an inlet sampling tube that is longer than necessary to span the duct width.
Use a 0.193-inch diameter (#11) drill and add the appropri­ate number of holes so that the total number of holes ex­posed to the air flow in the duct is 10 to 12. Space the additional holes as evenly as possible over the length of the tube.
Wiring Instructions
The DH400 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.
DH400 detectors are designed to operate with 12 or 24 VDC UL listed 2-wire compatible control panels. Alarm current must be limited by the control panel to 100mA or less. An example of a UL listed compatible control panel is the Fire­Lite model Sensiscan 1000 using zone card ANC-2 and compatibility identification “A”. Install per installation in­struction S1000/801. A maximum of 20 detectors may be installed per zone.
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