Bryant PURON 581J User Manual download pdf (Page 35)

takes the appropriate action to shut down fans and

blowers, change over air handling systems, notify the fire

alarm control panel, etc.

The sensor uses a process called differential sensing to

prevent gradual environmental changes from triggering

false alarms. A rapid change in environmental conditions,

such as smoke from a fire, causes the sensor to signal an

alarm state but dust and debris accumulated over time

does not.

For installations using two sensors, the duct smoke

detector does not differentiate which sensor signals an

alarm or trouble condition.

Duct smoke sensor

See

Detail A

Exhaust tube

Plug

Sampling tube

(ordered separately)

Intake

gasket

Cover gasket

(ordering option)

TSD-CO2

(ordering option)

Sensor housing

and electronics

Exhaust gasket

Coupling

Sensor cover

Detail A

Magnetic

test/reset

switch

Alarm

Trouble

Power

Dirty

C08209

Fig. 56 -- Smoke Detector Sensor

Smoke Detector Locations

Supply Air —

The Supply Air smoke detector sensor is located to the

left of the unit’s indoor (supply) fan. See Fig. 57. Access

is through the fan access panel. There is no sampling tube

used at this location. The sampling tube inlet extends

through the side plate of the fan housing (into a high

pressure area). The controller is located on a bracket to

the right of the return filter, accessed through the lift--off

filter panel.

Smoke Detector Sensor

C08245

Fig. 57 -- Typical Supply Air Smoke Detector Sensor

Location

Return Air without Economizer —

The sampling tube is located across the return air opening

on the unit basepan. See Fig. 58. The holes in the

sampling tube face downward, into the return air stream.

The sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat--mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See “Completing Installation of Return Air Smoke

Sensor:” on page 36 for details.)

Return Air Detector Sampling Tube

Controller module

Return Air Detector module

(shipping position shown)*

*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 58 -- Typical Return Air Detector Location

Return Air with Economizer —

The sampling tube is inserted through the side plates of

the economizer housing, placing it across the return air

opening on the unit basepan. See Fig. 59. The holes in the

sampling tube face downward, into the return air stream.

The sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat--mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See the following installation procedure.)

581J

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Bryant PURON 581J User Manual Page 35

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