GUIDE SPECIFICATIONS — 548F AND 549B036-120 UNITS (cont)

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15. Compressor Cycle Delay:

Unit shall be prevented from restarting for minimum of 5 min. after shutdown.

*16. Thru-the-Bottom Utility Connectors:

Kit shall provide connectors to permit electrical con- nections to be brought to the unit through the basepan.

*17. Fan/Filter Status Switch:

Provides status of indoor (evaporator) fan (ON/OFF) or filter (CLEAN/DIRTY). Status shall be displayed over communication bus when used with direct digital controls or with an indicator light at the thermostat.

*18. Solid-State Enthalpy Control:

a.For use with Durablade economizer package only.

b.Capable of sensing outdoor-air enthalpy content (temperature and humidity) and controlling econ- omizer cut-in point to have minimum heat content air passing over the indoor coil for most efficient system operation.

*19. Differential Enthalpy Sensor:

a.For use with Durablade economizer only.

b.Capable of comparing enthalpy content (tempera- ture and humidity) of outdoor and indoor air and controlling economizer cut-in point at the most economical level.

*20. EconoMi$er with Power Exhaust:

Package shall provide control of internal building pressure. The two-stage system shall exhaust up to 100% of return air (vertical only).

*21. Two-Stage Power Exhaust Accessory for EconoMi$er:

*23. Return Air Enthalpy Sensor:

The return air enthalpy sensor shall be used with the EconoMi$er device. When used in conjunction with an outdoor air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control.

*24. Return Air Temperature Sensor:

The return air temperature sensor shall be used with the EconoMi$er device. When used in conjunction with the standard outdoor air temperature sensor, the EconoMi$er device will provide differential tem- perature control.

*25. Power Exhaust Auxiliary Transformer:

Field-installed 460v to 230v transformer to provide power to the 230v power exhaust when attached to a 460v rooftop unit.

*26. Ultra-Violet Germicidal Lamps:

Ultra-violet germicidal lamps are designed to elimi- nate odor causing mold and fungus that may develop in the wet area of the evaporator section of the unit. The high output, low temperature germicidal lamps are field installed in the evaporator section of the unit, aimed at the evaporator coil and condensate pan. The short wavelength ultra-violet light inhibits and kills mold, fungus and microbial growth. The lamps have an output rating at 45 F in 400 fpm air- flow of 120 microwatts/cm2 at 1 meter.

*27. Hinged Panel Option (549B only):

Hinged panel option provides hinged access panels for the filter, compressor, evaporator fan, and control box areas. Filter hinged panels permit tool-less entry for changing filters. Each hinged panel is perma- nently attached to the rooftop unit.

28. Emergency Heat Control Package:

548F/549B036-

Power exhaust shall be used in conjunction with EconoMi$er to provide system exhaust of up to 100% of return air. The power exhaust is a field-installed accessory (vertical and horizontal applications).

The individual fans are energized through the end switches located in the actuator, which will open as the outdoor-air damper opens. These end switches are factory set for 30 and 70% of outdoor-air, and can be set to meet specific job requirements.

*22. Outdoor Air Enthalpy Sensor:

The outdoor air enthalpy sensor shall be used with the EconoMi$er device to provide single enthalpy control. When used in conjunction with a return air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control. The sensor allows the EconoMi$er controller to determine if outside air is suitable for free cooling.

When mechanical heating is locked out, auxiliary heat shall be activated when necessary.

29.Alternate Motors and/or Drives 548F036-060, 090, 120):

Alternate motors and drives shall be factory-installed to provide additional performance range.

30. High-Static Motor(s) and Drive(s) (548F036-120):

High-static motor(s) and drive(s) shall be factory- installed to provide and additional performance range.

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549B, 548F, 542J specifications

Bryant 542J is a high-efficiency gas furnace that stands out for its reliability and advanced heating technologies. Designed to deliver consistent warmth and comfort in residential settings, it combines innovative engineering with energy-efficient features.

One of the key characteristics of the Bryant 542J is its two-stage heating capability. This means that the furnace can adjust its heat output according to the heating demands of your home. During milder weather, it operates at a lower stage, consuming less energy while still maintaining a comfortable environment. When the temperatures drop, the furnace shifts to its higher capacity, providing the necessary warmth efficiently. This not only enhances comfort but also contributes to lower energy bills.

In addition to its two-stage operation, the Bryant 542J also incorporates a variable-speed blower motor. This technology allows the furnace to adjust the airflow depending on the heating requirements, ensuring an even distribution of warm air throughout the home. The variable-speed blower also operates more quietly than conventional fixed-speed motors, creating a serene indoor environment.

Energy efficiency is a hallmark of the Bryant 542J, boasting an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%. This impressive rating means that a significant portion of the energy consumed is effectively converted into usable heat, resulting in substantial savings on heating costs over time. Furthermore, the furnace is equipped with a sealed combustion system that draws air from outside the home, minimizing energy waste and improving indoor air quality.

Diagnostic features are another highlight of the Bryant 542J, which come equipped with SmartEvap technology. This allows the unit to self-diagnose potential issues, providing homeowners with peace of mind and simplifying maintenance procedures.

Durability is also a key feature of the Bryant 542J. It is constructed with high-quality materials designed to withstand harsh winter conditions, ensuring a long lifespan and reliable performance. Its compact design also allows for flexible installation, making it suitable for various residential layouts.

In summary, the Bryant 542J is more than just a gas furnace; it is a sophisticated heating solution that combines efficiency, comfort, and reliability. With features such as two-stage heating, a variable-speed blower, high AFUE ratings, and advanced diagnostics, it is an excellent choice for homeowners seeking an efficient and effective heating system.
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