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A6V10324659_c_en_--

These instructions are written in accordance with the installationguidelines of NFPA 72, National Fire Alarm Code. The modelOOH941 detector (shown in Figure 1) meets the VEWFD (VeryEarly Warning Fire Detector) classification and sensitivityrequirements of NFPA 76 (Standard for the Fire Protection ofTelecommunications Facilities) incorporating a programmable“Alert” (Pre-Alarm) sensitivity threshold of 0.2%/ft obscurationand an “Alarm” sensitivity threshold of 1.0%/ft obscuration.

CAUTIONDetection Device Storage

DO NOT install this detection device until all constructionis completed.

DO NOT store this detection device where it can becontaminated by dirt, dust, or humidity.

DETECTOR PLACEMENTAlthough no specific spacings are set for the detectors used fora clean air application, for multi-criteria fire detection use 30foot center spacing (900 sq ft) from NFPA Standard 72 initiatingdevices chapter, if practical, as a guide or starting point for adetector installation layout. This spacing, however, is based onideal conditions–smooth ceiling, no air movement, and nophysical obstructions. In some applications, therefore,considerably less area is protected adequately by each smokedetector. This is why it is mandatory to closely follow theinstallation drawings. In all installations place the detector onthe ceiling, a minimum of 6 inches from a side wall, or on a wall,12 inches from the ceiling.

For thermal detection, use the matrix below:

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05 571,561,551,541,531 drauGtuohtiWdnahtiW

06 571,561,551,541,531 drauGtuohtiW

06 551,541,531 drauGhtiW

07 541,531 drauGtuohtiW

07 531 drauGhtiW

If you have any questions regarding detector placement, followthe drawings provided or approved by Siemens Industry, Inc.,or by its authorized distributors. This is extremely important! Thedetector placements shown on these drawings were chosen aftera careful evaluation of the area that is protected. Such factorsas air currents, temperature, humidity, pressure, and the natureof the fire load were carefully considered. Especially noted werethe room or area configuration and the type of ceiling (sloped orflat, smooth or beamed). Siemens Industry, Inc.’s extensiveexperience in the design of the system assures the best detectorplacement by following these drawings.

TO AVOID NUISANCE ALARMSDo not locate the detectors where excessive smokeconcentrations exist under normal conditions, or in areas ofprolonged high relative humidity where condensation occurs.

Do not locate the detectors next to an oil burner, kitchen, orgarage where exhaust fumes can trigger an alarm. Other causesof false alarm are dust accumulation, heavy concentrations ofsteam, heavy pipe or cigar smoke, and certain aerosol sprays.

AIR CURRENTSBefore a detector can sense a fire, the products of combustionor smoke must travel from the fire to the detector. This travel isespecially influenced by air currents; therefore, consider airmovement when designing the system. While combustionproducts tend to rise, drafts from hallways, air diffusers, fans,etc., may help or hinder the travel of combustion products to thedetector. When positioning a detector at a particular location,give consideration to windows and doors, both open and closed,to ventilating systems, both in and out of operation, and to otherfactors influencing air movement. Do not install a detector in theair stream of a room air supply diffuser. It is better to position adetector closer to an air return.

The distance that products of combustion or smoke travel froma fire to the detector is not usually the shortest linear route.Combustion products or smoke usually rise to the ceiling, thenspread out. Average ceiling heights of 8 to 10 feet do notabnormally affect detector response. High ceilings, located inchurches, warehouses, auditoriums, etc., do affect detectorresponse and should be considered.

Figure 1OOH941

Multi-Criteria Fire Detector

Installation InstructionsModel OOH941

Siemens Industry, Inc.Building Technologies Division

A6V10324659_c_en_--2

SPECIAL CEILING CONSTRUCTION FACTORSCeiling obstructions change the natural movement of air andcombustion products. Depending on the direction of smoketravel, joists and beams can slow the movement of heated airand smoke, while pockets between them can contain a reducedlevel of smoke. Take obstructions created by girders, joists,beams, air conditioning ducts, or architectural design intoconsideration when determining area protection. Refer to theInitiating Devices chapter of NFPA Standard 72 for Location andSpacing requirements for specific types of construction; e.g.beam, suspended, level, sloped and peaked ceilings.

TEMPERATURE – HUMIDITY – PRESSURE – AIR VELOCITYThe temperature range for the OOH941 detector is 32°F (0°C)to 120°F (49°C). Use the detector in environments where thehumidity does not exceed 95% (non-condensing). Normalchanges of atmospheric pressure do not affect detectorsensitivity. The air velocity range is 0-4000 ft/min for open areasapplications. Follow detector spacing and location requirementsin NFPA 72 Chapter for High Air Movement Areas and Controlof Smoke Spread. The detectors can also be installed in ductapplications between 0 and 4000 ft/min. For duct installationsfollow detector installation requirements in NFPA 90A, Chapterfor Special Ceiling Construction Factors. When the detectorsemploy a fixed temperature rating of 1650F or less, they areintended for a maximum installation temperature of 1000F(37.80C).

UL listed with STI Mechanical Protection Guard Model: STI-9604(see www.STI-USA.com for details).

LED INDICATOR OPERATIONThe Model OOH941 contains an LED indicator capable offlashing either one of three distinct colors: green, yellow, or red.During each flash interval, the microprocessor-based detectormonitors the following:

• Smoke in its sensing chamber• Smoke sensitivity is within the range indicated on the

nameplate label• Internal sensors and electronics

Based on the results of the monitoring, the LED indicator flashesthe following:

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DETECTOR PROGRAMMINGEach detector must be programmed to respond to a uniquesystem address between 001 - 050 for FC901.

• To program the detector address, use the Model 8720 orDPU Programming Unit. Refer to the 8720 Manual, P/N315-033260FA or the DPU Manual, P/N 315-033260.

• Record the loop and device number (system address) forthe detector on the detector label and on the base to prevent

installing the detector in the wrong base. The optional 8720/DPU label printer can be used for this purpose.

Each detector provides pre-programmed parameter sets whichcan be selected by the panel. The OOH941 provides twodifferent alarm channels: multi-criteria (UL268) and direct in-duct (UL268A), and heat (UL521) which can be usedsimultaneously and can be switched on or off individually by thepanel. Follow the corresponding description of the panel used.The OOH941 can be set to the OOH941 Selectable ApplicationProfiles, the OOH941 Selectable Fixed Temperature ThresholdProfiles and the OOH941 Selectable Alarm Threshold SettingProfiles shown in the tables below and to the right.

Additionally the detector can have another channel that can beconfigured by the panel to have a low or high temperaturewarning in the range from -4° to 120°F (-20° to 49°C). (Not withFC901.)

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ELECTRICALFor information on electrical characteristics of the detector, referto the OOH941/OOHC941 Technical Manual, A6V10325547 athttp://iknow.us009.siemens.net/infolink. Refer to the panelInstallation, Operation and Maintenance Manual for maximumline impedance of the loop driver.

WIRINGDetector bases for Model OOH941 should be connected asshown in Figure 2.

DETECTOR MOUNTINGThe recommended orientation of the detector for wall mountingis shown in Figure 3. To ensure proper installation of the detectorhead into the base, be sure the wires are properly dressed atinstallation:

• Position all wires flat against the base.• Take up all slack in the outlet box• Route wires away from connector terminals.

TO INSTALL DETECTOR HEAD:• Rotate detector counterclockwise while gently pressing on

it until the detector seats fully into base.• Then rotate the detector clockwise until it stops and locks in

place. Insert optional locking screw (Order Model LK-11).

TO REMOVE DETECTOR HEAD:• Loosen locking screw, if installed. Then rotate the detector

counterclockwise until stop is reached.• Pull detector out of base.

Siemens Industry, Inc.Building Technologies Division

A6V10324659_c_en_--3

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Siemens Industry, Inc.Building Technologies Division8 Fernwood RoadFlorham Park, NJ 07932

A6V10324659_c_en_--

Figure 2Installation and Wiring Diagram

FROM ADDRESSABLEDEVICE CIRCUIT OF ACOMPATIBLE CONTROLUNIT OR PREVIOUSADDRESSABLE DEVICE

OPTIONALREMOTEALARMINDICATORMODELS8727W / 8727C /RL-HC / RL-HW

TO NEXT BASE

TO NEXT BASE

DO NOTUSE ANEND OFLINEDEVICE

DETECTOR BASEMODEL DB-11/DB-11E

LINE 1**

LINE 2**

5

6

1a

TB1

TB3

TB21b

5

6

1a

1b

RELAY*CONTACTS3A, 120 VAC3A, 30 VDC

REMOTE RELAYBASE MODEL DB2-HR***

*The relay contacts are shown after System reset, which represents the non-alarm condition.

**OOH941 is a polarity insensitive detector. Line 1 and Line 2 can be either line of the loop.

5

NOC

NC6

5

NOC

NC6

DO NOTUSE ANEND OFLINEDEVICE

SUPERVISED AND POWER LIMITED

***OOH941 is NOT compatible with the DB-HR base.

DETECTOR TESTINGOnly qualified service personnel should test. To assure properoperation of the detector, both the Sensitivity and FunctionalTest should be conducted. The minimum test schedule may befound in the current edition of NFPA 72.

SENSITIVITY MEASUREMENTThe sensitivity of OOH941 detectors can be tested individuallyusing the 8720 or DPU. Refer to the 8720 Manual, P/N 315-033260FA or the DPU Manual, P/N 315-033260. The sensitivitycan be measured by the panel. Follow the instructions of thepanel used.

FUNCTIONAL TESTPerform a functional (Go, No-Go) test by activating the detectorusing SmokeCheck™ Test Gas from HSI Fire & Safety Group,part number HO-25S (see www.homesafeguard.com for details),following the instruction on the gas canister label.

CAUTION: DO NOT USE AT DISTANCES SMALLER THAN 2 FEET(0.6m) FROM DETECTOR.

This test is simply used to ensure that smoke can enter thesensing chamber and alarm the control panel when the detectorreaches the programmed obscuration (concentration) level.

The OOH941 detectors can also be tested individually usingthe 8720 or DPU. Refer to the 8720 Manual, P/N 315-033260FAor the DPU Manual, P/N 315-033260.

MAINTENANCEThe control unit automatically indicates the trouble message forthe OOH941 detector whose smoke chamber changes to thelevel where the set sensitivity cannot be maintained. In suchcircumstances, the detector may require replacement.

CAUTION: UNDER NO CIRCUMSTANCES IS THE DETECTOR HEADTO BE DISASSEMBLED. NO REPAIRS SHOULD BE ATTEMPTED.

DO NOT PAINTThe detector/base plastic is marked DO NOT PAINT. This isintended to prohibit painting during routine maintenance of theoccupancy which can affect proper operation of the detector.

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Figure 3Recommended Detector Wall Mounting / Detector Guard Orientation

4-INCH SQUARE BOX2 1/8-INCHES DEEP

MOUNT BOX ONWALL WITHEXTERIOR

MOUNTING HOLESIN UPPER LEFT

AND LOWERRIGHT POSITIONS

WALL

DO

NO

TPA

INT

1. 2.

LOCKING HOLE

3.MOUNT DETECTORBASE TO 4-INCHSQUARE BOX ASSHOWN WITHLOCKING HOLEON LEFT TOP INPOSITION SHOWN

DB-11 BASE DETECTOR

WHEN 4-INCH SQUAREBOX AND DETECTOR BASEARE MOUNTED AS SHOWN,DETECTOR LED WILL BE INRECOMMENDED 0 POSITIONWITH DETECTOR INSERTEDIN BASE.

0

WHEN MOUNTING THE STI-9604MECHANICAL GUARD (BOTHPOSITIONS: WALL OR CEILING),USE ORIENTATION INDICATED INTHIS DRAWING.

STI-9604