Smoke Detectors, System, Controller Assembly, Sensor

NOTE: Contact your Bryant applications engineer for details on configuration of RTU-MP, operating sequences and troubleshooting information, as well as details on configuration and troubleshooting of connected networks.

Smoke Detectors

Smoke detectors are available as factory-installed options on 548J*14D models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer or in combination of Supply Air and Return Air. Return Air smoke detectors are arranged for vertical return configurations only. All components necessary for operation are factory-provided and mounted. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements.

Units equipped with factory-optional Return Air smoke detectors require a relocation of the sensor module at unit installation. See “Completing Installation of Return Air Smoke Sensor:” on page 29 for details.

System —

Controller housing and electronics

Conduit couplings (supplied by installer)

Alarm

Duct smoke sensor controller

Conduit nuts (supplied by installer)

Conduit support plate

Terminal block cover

Cover gasket (ordering option)

Controller cover

Fastener (2X)

Trouble

Power

Test/reset

switch

548J*14D

The smoke detector system consists of a four-wire controller and one or two sensors. Its primary function is to shut down the rooftop unit in order to prevent smoke from circulating throughout the building. It is not to be used as a life saving device.

Controller —

The controller (see Fig. 49) includes a controller housing, a printed circuit board, and a clear plastic cover. The controller can be connected to one or two compatible duct

C08208

Fig. 49 - Controller Assembly

Duct smoke sensor

smoke sensors. The clear plastic cover is secured to the housing with a single captive screw for easy access to the wiring terminals. The controller has three LEDs (for Power, Trouble and Alarm) and a manual test/reset button, all located on the cover face.

Sensor —

The sensor (see Fig. 50) includes a plastic housing, a printed circuit board, a clear plastic cover, a sampling tube inlet and an exhaust tube. 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 captive 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 (for Power, Trouble, Alarm and Dirty) and a manual test/reset button (on the left-side of the housing).

Exhaust tube