Bryant 581A/B manual Features/Benefits

FEATURES/BENEFITS (cont)

INDOOR-AIR QUALITY (IAQ) BEGINS WITH BRYANT ROOF- TOPS — Sloped condensate pans minimize biological growth in rooftop units in accordance with ASHRAE (American Society of Heating, Refrigeration and Air Conditioning Engineers) Standard 62. Two-inch filters with optional dirty filter indicator switch provide for greater particle reduction in the return air. The face-split evaporator coils improve the dehumidification capability of standard units, maximize building humidity control.

Optional proportional reacting CO2 sensor is available with the EconoMi$er IV outdoor air damper option/accessory to aid the IAQ benefits.

PERFECT HUMIDITY™ ADAPTIVE DEHUMIDIFICATION SYSTEM (581B036-150 only) — Bryant’s Perfect Humidity adaptive dehumidification system is an all-inclusive factory- installed option that can be ordered with any 581B rooftop unit to meet the demand for providing a flexible and high performing solution to accommodate all of these design related issues. This system expands the envelope of operation of 581B rooftop products to provide unprecedented flexibility to meet year-round comfort conditions. The Perfect Humidity adaptive dehumidifica- tion system has the industry’s only dual dehumidification mode setting. The Perfect Humidity system includes two new modes of operation. The 581B rooftop coupled with the Perfect Humid- ity system is capable of operating in normal design cooling mode, subcooling mode, and hot gas reheat mode. Normal Design Cooling mode is when the unit will operate under its nor- mal sequence of operation by cycling compressors to maintain comfort conditions. Subcooling mode will operate to satisfy part load type conditions when the space requires combined sensi- ble and a higher proportion of latent load control. Hot Gas

Reheat mode will operate when outdoor temperatures diminish and the need for latent capacity is required for sole humidity control. Hot Gas Reheat mode will provide neutral air for maxi- mum dehumidification operation.

EXCLUSIVE HOT GAS REHEAT DEHUMIDIFICATION PACK- AGE (581A181-300) — The hot gas reheat dehumidification package is a result of recent advances by Bryant in controlling comfort levels. This factory-installed option significantly improves the dehumidification capability of the rooftop unit and helps control humidity levels in the building.

This option provides increased dehumidification by cooling the hot liquid refrigerant leaving the condenser coil. The hot gas reheat package consists of a subcooling coil located on the leaving-air side of the evaporator coil. The location of this coil in the indoor airstream enhances the latent capacity of the units by as much as 40%. Many buildings suffer from humidity dam- age or poor indoor air quality due to humid conditions. The improved latent capacity provided by the hot gas reheat option reduces the building’s humidity, eliminating potential property damage and making the space more comfortable.

The hot gas reheat option is the ideal IAQ option for hot and humid regions. The operation of the hot gas reheat package can be controlled by a field-installed, wall mounted humidistat or Thermidistat™ device. The circuit activates only when needed (using the accessory humidistat) as opposed to some dehumidification systems that operate continuously. The humi- distat can be set for any humidity level between 20% and 80% relative humidity. The Thermidistat device can be set for any humidity level between 50% and 90% relative humidity.

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