Bryant F Manuel d'utilisateur télécharger pdf (Page 18)

Duct smoke sensor

controller

Fastener

(2X)

Controller cover

Conduit nuts

(supplied by installer)

Conduit support plate

Cover gasket

(ordering option)

Conduit couplings

(supplied by installer)

Terminal block cover

Controller housing

and electronics

Alarm

Power

Te s t / r e s e t

switch

Trouble

C08208

Fig. 19 -- Controller Assembly

Sensor

The sensor i ncludes a plastic housing, a printed circuit

board, a clear plastic cover, a sampling tube inlet and an

exhaust tube. (See Fig. 20.) The sampling tube (when

used) and exhaust tube are attached during installation.

The sampling tube varies in length depending on the size

of the rooftop unit. The clear plastic cover permits visual

inspections without having to disassemble the sensor. The

cover attaches to the sensor housing using four capt ive

screws and forms an airtight chamber around the sensing

electronics. Each sensor includes a harness with an RJ45

terminal for connecting to the controller. Each sensor has

four LEDs (Power, Trouble, Alarm and Dirty) and a

manua l test/reset button (on the left--side of the housing).

Air is introduced to the duct smoke detector sensor ’s

sensing cha mber through a sampling tube that extends into

the HVAC duct and is directed back into the ventilation

system through a (shorter) exhaust tube. The difference in

air pressure between the two tubes pulls the sampled air

through the sensing chamber. When a sufficient amount of

smoke is detected in the sensing chamber, the sensor

signals an alarm state and the controller automatically

take s the appropriate action to shut down fans and

blowers, change ove r 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.

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. 20 -- Smoke Detector Sensor

For installations using two sensors, the duct smoke

dete ctor doe s not differentiate which sensor signals an

alarm or trouble condition.

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. 21.) Access

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

used at this location. The sampling tube inlet extends

through t he side pl ate of the fan housing (i nto 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. 21 -- Typical Supply Air Smoke Detector

Sensor Location

580J

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 84 85

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Bryant F Manuel d'utilisateur Page 18

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