Siemens FDBZ492-PR Installation Instructions Manual

Global Air Duct Monitoring Housing

Installat ion Instructions Model FDBZ492-PR

INTRODUCTION Model FDBZ492-PR from Siemens Industry, Inc., is a RoHS

compliant air duct monitoring housing containing sampling tubes. When used with a Siemens conventional smoke detector, smoke and combustion products are detected for shutdown of the duct system and/or operation of supplementary equipment as provided by the system control panel. The duct unit supports two sets of Form C alarm contacts, one Form A alarm contact and one Form C trouble contact. The trouble contact supervises the presence of the input power, removal of the detector cover and the removal of the smoke detector head.

TECHNICAL DATA AIR DUCT CONDITIONS

Temperature Range:

With PE-11, 8854, PE-11C: 0

C (32OF) - 38OC (100OF)

With OP121: 0

C (32OF) - 49OC (120OF)

Altitude Range:

No altitude limitations

Relative Humidity:

Up to 95% RH (non-condensing/non-freezing)

Air Duct Velocity Range:

100-4000 ft/min

Sampling and Exhaust Tube Pressure Differential Range:

Greater than 0.01 and less than 1.2 inches of water column

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ASSEMBLY This detector has a cover tamper (removal) switch. Care should

be taken when installing the cover. Squarely place the cover on the unit to aviod possible damage to the switch.

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P/N A6V10330327_a_en

Siemens Industry, Inc. Building Technologies Division

APPLICATION The FDBZ492-PR duct smoke detectors provide early detection

of smoke and products of combustion present in air moving through an HVAC duct supply, return, or both. These devices are designed to prevent the recirculation of smoke in areas by the air handling system’s fans and blowers and may be used with fire alarm systems that shut down complete air handling system in the event of smoke detection.

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This unit is not intended for open area protection nor should it be used for early warning detection or to replace a regular fire detection system.

OPERATION When the Model FDBZ492-PR is operating, a sample of air is

drawn from the duct and passed through the sampling chamber by means of the input sampling tube. The air sample passes through the smoke detector mounted in the duct housing and is exhausted back into the duct through the outlet tube.

• The FDBZ492-PR supports two sets of Form C alarm contacts, one Form A alarm contact and one Form C trouble contact. The trouble contact supervises the presence of the input power, removal of the detector cover and the removal of the smoke detector head.

• The FDBZ492-PR contains a green power on LED, red alarm LED and yellow trouble LED which are visible through the housing cover.

• The trouble LED is activated when either the housing cover or smoke detector is removed from the unit.

• When the trouble LED is activated, the power LED turns off.

• A reset/test switch is located on the housing cover and is used to reset the unit after an alarm and the smoke condition is cleared. When not in alarm, the reset/test switch can be used to test that the unit will operate properly when an alarm condition exists.

The trouble contacts will not operate in the event of a smoke alarm. The FDBZ492-PR duct detector will operate from various input voltage sources; namely 24VAC, 24VDC, 115VAC and 230VAC.

Siemens Industry, Inc. Building Technologies Division

3 P/N A6V10330327_a_en

Detector LED The FDBZ492-PR contains an LED indicator (located on the

smoke detector) capable of flashing either one of three distinct colors: green, yellow, or red. During each flash interval, the microprocessor based detector checks the following:

• for smoke in its sensing chamber

• that its critical smoke sensing electronics are operating.

Based on the results of these checks, the LED indicator flashes as follows:

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MOUNTING THE AIR DUCT HOUSING

Location on Duct System

This guideline contains general information on duct smoke detector installation, but does not preclude the NFPA documents listed. Siemens Industry, Inc. assumes no responsibility for improperly installed duct detectors. To determine the correct installation position for an FDBZ492-PR duct smoke detector, the following factors must be considered.

1) A uniform non-turbulent (laminar) airflow between 100 ft/ min. to 5,000 ft/min. must be present in the HVAC duct. To determine duct velocities, examine the engineering specifications that define the expected velocities or use an Alnor model 6000AP velocity meter (or equivalent).

2) To minimize the impact of air turbulence and stratification on performance, a duct smoke detector should be located as far as possible downstream from any obstruction (i.e. deflector plates, elbows, dampers, etc.). In all situations,

P/N A6V10330327_a_en

Siemens Industry, Inc. Building Technologies Division

confirmation of velocity and pressure differential within specifications is required.

The pressure differential between the input sampling (high pressure) tube and outlet (low pressure) tube for the FDBZ492-PR smoke duct detector should be greater than

0.01 inches of water and less than 1.2 inches of water.

3) Identify a code compliant location (supply or return side, or both) for the installation of the duct unit that will permit easy access for viewing and serviceability.

4) When installing on the return side, install duct units prior to the air being exhausted from the building or diluted with outside “fresh” air.

5) When installing duct smoke units downstream of filters, fires occurring in the filters will be detected, but if the filters become blocked, insufficient air flow through the duct unit will prevent the correct operation of the duct detector. Duct units installed in the supply air side may monitor upstream equipment and/or filters.

Figure 2 Recommended Locations in Duct Systems

RETURN

AIR

SUPPLY

AIR

AIR DUCT HOUSING

DAMPER

BLOWER

FILTER

PLENUM

FRESH AIR INTAKE

DAMPER

TYPE A: CLOSED SYSTEM - NO EXHAUST

D D

TYPE B: PROVISION FOR EXHAUSTING

SOME PERCENTAGE OF RETURN AIR

RETURN

AIR

SUPPLY

AIR

AIR DUCT HOUSING

DAMPER

BLOWER

FILTER

PLENUM

FRESH AIR INTAKE

DAMPER

D D

EXHAUST AIR

OUTPUT

DAMPER

TYPE C: RETURN AIR UNDER POSITIVE PRESSURE

FROM SEPARATE BLOWER

EXHAUST AIR

OUTPUT

DAMPER

RETURN

AIR

SUPPLY

AIR

AIR DUCT HOUSING

RETURN AIR

BLOWER

AIR DUCT

HOUSING

DAMPER

BLOWER

FILTER

PLENUM

FRESH AIR INTAKE

DAMPER

D D

Figure 1 Typical Mounting of Duct Housing

OUTLET

TUBE

INPUT

SAMPLING

TUBE

CENTER

LINE

OF DUCT

+ 8 hidden pages

Siemens FDBZ492-PR Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual