Bryant 551A, 558F Single-Point Electrical Power Connections permit easier, Indoor-Air Quality Iaq

Units are Easily Converted from vertical to horizontal applica- tions to make retrofit and add-on jobs easier. To convert from vertical to horizontal discharge, simply relocate 2 panels (036-150).

The same basic unit can be used for a variety of applications and can be quickly modified at the jobsite. Standard high- performance, belt-driven, evaporator-fan motors enable the 551B036-150 units to operate in most ductwork configurations.

Ductwork Connections are Simplified by the logical 2 to 1 aspect ratio. On vertical discharge units, ductwork attaches directly to the roof curb.

Thru-the-Bottom Service Connection capability allows power and control wiring to be routed through the unit basepan and roof curb (if installed), thereby minimizing roof penetrations (to prevent water leaks). Both power and control connections are made on the same side of the unit to simplify installation.

The Non-Corrosive, Sloped, Condensate Drain Pan is in conformance with ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) Standard 62 to meet many Indoor-Air Quality (IAQ) specifications. The conden- sate drain pan offers both bottom and end drain capability to minimize roof penetrations. The bottom drain can be used in conjunction with the thru-the-bottom connections. An external trap must be field supplied (035-150).

Standard 2-in. Throwaway Filters are easily accessed through a removable filter access panel located directly above the air intake hood; no tools are required to change the filters.

All Units are Designed with a Single Continuous Top Piece to eliminate leaking at the seams or gasketing (036-150).

Belt-Driven Evaporator-Fan Motors on All Sizes allow maxi- mum on-site flexibility without changing motors or drives (except 558F036-060).

Low-Voltage Wiring Connections are easily made due to the terminal board which is conveniently located for quick simple access.

Single-Point Electrical Power Connections permit easier

wire estimating and connections.

Field-Installed Accessory Electric Heaters are available in a wide range of capacities. Single-point wiring kit makes installa- tion simple.

QUIET, EFFICIENT OPERATION AND DEPENDABLE PERFORMANCE

All Units are Equipped with Compressors that are fully her- metic with internal vibration isolators for extremely quiet and highly efficient operation. Compressors are mounted on an independent plate for additional sound integrity and structural support. Efficient condenser fan and motor design permits operation at low sound levels.

Totally Enclosed Condenser Fan Motors and permanently

lubricated bearings provide additional dependability.

All Coils Use State-of-the-Art Internally Enhanced Copper Tubing. Coils are thoroughly leak and pressure tested at the factory. Condenser coils have louvered, aluminum lanced fins to provide maximum heat transfer for optimum efficiency and easy cleaning.

Refrigerant Circuit Protection ensures dependability. All units have standard:

1.Loss-of-charge/low-pressure protection switch which allows operation at lower ambient conditions while protecting against low-charge operation.

2.Freeze-protection thermostat, which protects against evap- orator coil frost build-up.

3.High-pressure switch, which protects against above normal operating pressure.

4.Filter driers, which trap moisture and debris in the refrigera- tion system.

5.A fixed orifice metering system precisely controls refrigerant flow (sizes 036-150), preventing slugging and floodback, while maintaining optimum unit performance by meter- ing the circuits individually. TXV meeting system on sizes 155-300.

Two Independent Compressor Circuits (all 090-300 size units) provide pinpoint comfort control, improved efficiency, and back-up capability.

BRYANT CONTROLS ADD RELIABILITY, EFFICIENCY, AND SIMPLIFICATION

The Standard Control System is readily adaptable to all con- ventional and programmable thermostats.

Patented Cycle-LOC™ Protection System provides protec- tion against compressor cycling by monitoring compressor cur- rent (except 558F036-150). When a lack of compressor current exists, the Cycle-LOC circuit board locks out the compressors. Cycle-LOC may be manually reset by simply switching the ther- mostat to OFF, and back to the Cooling or AUTO modes. No use of the unit power disconnect switch is required.

INDOOR-AIR QUALITY (IAQ)

Bryant rooftop units utilize certain key features that assist in improving the quality of the building air. Sloped condensate pans eliminate possible biological growth in the rooftop unit. A face-split indoor coil design (all 090-300 size units) proves effective in additional moisture removal from the supply air. Two-in. filters are standard in all rooftop units with an optional filter status sensor available.

Another Optional Indoor-Air Quality (IAQ) Feature is the Perfect Humidity™ dehumidification package (except 558F036- 150). This is a factory-installed option that provides increased dehumidification by cooling the hot liquid refrigerant leaving the condenser coil. The Perfect Humidity option consists of a sub- cooling 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 damage or poor indoor air quality due to humid conditions. The improved latent capacity provided by the Perfect Humidity option reduces the building’s humidity, elimi- nating potential property damage and making the space more comfortable.

The Perfect Humidity option makes units ideal IAQ rooftops for hot and humid regions. The operation of the Perfect Humidity package can be controlled by a field-installed, wall-mounted humidistat, or light commercial thermidistat. The circuit acti- vates only when needed (using the accessory humidistat) as opposed to some dehumidification systems that operate contin- uously. The humidistat can be set for any humidity level between 20% and 80% relative humidity.

SERVICEABILITY

Servicing a Rooftop Unit has Never Been Easier with the new factory-installed Hinged Panel Option (except 558F036- 150). This option includes hinged access panels for the filter, compressor, evaporator-fan motor, and control box areas. These panels provide quick and simple access to the major components by simply unlocking and swinging open the differ- ent panels. Each hinged access panel is permanently attached to the rooftop unit, eliminating the problem of access panels being dropped and creating a hole in the roof (potentially caus- ing a water leak). This type of damage could void any warranty offered for a new roof.

Standardized Components for the complete line of products are found in all safety devices, condenser-fan motors, and con- trol boards. This allows for greater inventory control, familiarity, and fewer stocked parts.

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