Bryant 548J*14D Smoke Detector Locations, Supply Air, Return Air with Economizer

Page 28

Air is introduced to the duct smoke detector sensor’s sensing chamber 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 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

 

548J*14D

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.

 

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. 51. Access

 

is through the left side blower 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. 51 - 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. 52. 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 29 for details.)

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. 52. 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.)

Flexible

Exhaust Tube

Return Air

Sampling Tube

C10330

Fig. 52 - Return Air Sampling Tube Location

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Contents Installation Instructions Safety Considerations Unit Dimensional Drawing Size 14 Unit Service Clearance Dimensional Drawing Plan for Unit LocationInspect Unit Plan for Sequence of Unit InstallationProvide Unit Support Roof Curb Details Field Fabricate Ductwork For Units with Accessory Electric HeatersRig and Place Unit Convert to Horizontal and Connect Ductwork when required Install Outside Air HoodEconomizer Hood Removal and Setup Factory Option Positioning on CurbDamper Assembly Install External Condensate Trap and Line Economizer Hood and Two-Position HoodField Power Supply Make Electrical ConnectionsMounting Position for Field Disconnects Over 100A Units Without Factory-Installed Disconnect Units with Factory-Installed DisconnectUnit Powered Convenience Outlet Wiring Field Control Wiring Factory-Option Thru-Base ConnectionsThermostat Units without Thru-Base ConnectionsHeat Anticipator Settings Unit without Thru-Base Connection KitHeater and Supplementary Fuses Single Point BoxesHeater Low-Voltage Control Connections Return Air Enthalpy Sensor Outdoor Air Enthalpy Control PNO 33CSENTHSWDifferential Enthalpy Control RTU-MP Control System RTU-MP System Control Wiring Diagram Supply Air Temperature SAT Sensor RTU-MP Controller Inputs and OutputsOutdoor Air Temperature OAT Sensor Space Temperature SPT SensorsField Connections EconoMi$er2RTU-MP T-56 Sensor Connections Indoor Air Quality CO2 sensorOutdoor Air Quality Sensor PNO 33ZCSENCO2 plus Connecting Discrete InputsWeatherproof enclosure Communication Wiring Protocols Local AccessRTU-MP Troubleshooting GeneralLEDs LEDs on the RTU-MP show the status of certain functionsSmoke Detectors SystemController SensorSupply Air Smoke Detector LocationsReturn Air with Economizer Completing Installation of Return Air Smoke Sensor Return Air Detector Shipping PositionUnit Wire/Fuse or Hacr Breaker Sizing Data NonePwrd C.O Adjust Factory-Installed Options EconoMi$er IV Occupancy SwitchInstall Accessories Pre-Start and Start-Up548J*14D 548J*14D Catalog No. II548J---07

548J*14D specifications

The Bryant 548J*14D is a highly efficient and versatile air conditioning unit designed to meet the varying demands of residential and light commercial applications. This model stands out due to its advanced engineering, energy-saving features, and reliable performance, making it an ideal choice for homeowners looking to enhance comfort without compromising on energy efficiency.

One of the main features of the Bryant 548J*14D is its excellent SEER (Seasonal Energy Efficiency Ratio) rating, which signifies its ability to provide cooling while consuming less energy. Optimized for efficiency, this unit employs a high-efficiency compressor that adjusts its output based on cooling demands, allowing it to use only the energy necessary to maintain a comfortable environment.

The unit’s all-aluminum evaporator coil ensures durability and resistance to corrosion, contributing to its longer lifespan and consistent performance. Additionally, the Bryant 548J*14D incorporates advanced refrigeration technologies for maximum heat transfer efficiency. This technology not only enhances cooling performance but also improves overall system reliability.

A key characteristic of the Bryant 548J*14D is its Whisper Series technology designed for quiet operation. The low-noise design minimizes sound levels, allowing for unobtrusive cooling in residential spaces while still ensuring effective airflow and cooling capacity. This makes it particularly favorable for installation in bedrooms and other noise-sensitive areas.

Another noteworthy aspect of the Bryant 548J*14D is its compatibility with the MyBryant smartphone app, which enables homeowners to monitor and control their HVAC systems remotely. This connectivity offers convenience and helps to optimize energy usage, as users can adjust settings based on their schedules and preferences.

Furthermore, the Bryant 548J*14D is designed with a robustness that allows it to withstand diverse weather conditions, ensuring reliable performance even in extreme climates. The unit’s compact design eases installation in various settings, whether it's on rooftops, near walls, or on concrete pads.

In summary, the Bryant 548J*14D is a cutting-edge air conditioning unit that combines energy efficiency, quiet operation, and advanced technologies. With its robust construction, smart features, and reliable performance, it stands as a valuable solution for anyone looking to enhance comfort and save on energy costs in their homes or light commercial environments.
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