Thru-the-Bottom Service Connection Capability comes standard with the rooftop unit to allow power and control wiring to be routed through the unit’s basepan, 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 standard and in conformance with ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) Standard 62 to meet many Indoor Air Quality (IAQ) specifica- tions. The condensate drain pan offers both bottom and end drain capability to minimize roof penetrations. The bottom drain can be used in conjunction with thru-the-bottom connections. An external trap must be field supplied.
Standard 2-in. Throwaway Filters are easily accessed through an easily 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, which tends to deteriorate over time and shift during rigging procedures.
Belt-Driven Evaporator-Fan Motors allow maximum on-site flexibility without changing motors or drives.
Low-Voltage Wiring Connections are easily made due to the large terminal board which is conveniently located for quick, simple access.
QUIET, EFFICIENT OPERATION AND DEPENDABLE PERFORMANCE
All Units are Equipped With Scroll Compressors which are fully hermetic with internal vibration isolators for extremely quiet operation. The scroll compressors are quieter and more reliable than reciprocating designs. 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 tested with helium particles as well as pressure tested at the factory. Condenser coils have lou- vered, aluminum lanced fins to provide maximum heat transfer for optimum efficiency and easy cleaning.
Exclusive Dimpled Heat Exchangers optimize heat transfer for improved efficiency. The tubular design permits hot gases to make multiple passes across the path of the supply air. In addi- tion, dimpled heat exchanger tubes act as baffles, forcing the hot gases to stay in close contact with the cell walls to maximize heat transfer and efficiency.
The California Air Quality Management NOx requirement of 40 nanograms/joule or less is met with Low kit NOx models in 036-060 sizes.
The Induced Draft Combustion System eliminates the unsightly appearance of flue stacks, and diminishes the effects of winds on heating operation. The inducer fan draws hot com- bustion gas through the heat exchanger at the optimum rate for the most effective heat transfer. The induced draft (negative pressure) also prevents contaminants from entering the supply air if a leak in the heat exchanger occurs.
The Direct Spark Ignition System saves operating expense when compared to old-style pilot ignition systems. No crossover tube is required, therefore no sooting or pilot fouling problems can occur.
LP (Liquid Propane) Conversion Kit — Standard units are
designed for natural gas. An LP Conversion Kit is available as an accessory, if required. Installation of the accessory LP kit simply involves changing the gas orifices to accommodate liq- uid propane gas.
Refrigerant Circuit Protection assures 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 evapo- rator 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)Bryant’s exclusive fixed orifice metering device, which pre- cisely controls refrigerant flow, preventing slugging and floodback, while maintaining optimum unit performance by metering the circuits individually.
Two Independent Compressor Circuits (all 71/2 to 121/2 ton
units) provide pinpoint comfort control, improved efficiency, and back-up capability.
The Standard Control System is readily adaptable to all con- ventional thermostats.
Integrated Gas Unit Controller (IGC) — All ignition compo-
nents are contained in the compact Integrated Gas Controller (IGC) that is easily accessible for service. The IGC provides built in diagnostic capabilities. An LED simplifies troubleshoot- ing by providing visual fault notification and system status infor- mation. The IGC board provides exclusive anti-cycle protection for its gas heat operation. The IGC also contains burner control logic for dependable heating operation. The LED is visible with- out removing the unit control box access panel. The 581B units maximize heating efficiency through the IGC’s control of evapo- rator fan ON/OFF delays. The IGC helps make 581B units reli- able for many years.
Patented Cycle-LOC™ Protection System provides protec-
tion against compressor cycling by monitoring compressor cur- rent draw. When lack of compressor current exists, the Cycle- LOC circuit board locks out the compressors. The Cycle-LOC board may be manually reset by simply switching thermostat to OFF, and then back to the Cooling or AUTO modes. No manipu- lation of the unit disconnect switch is needed.
TABLE OF CONTENTS
Page
Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . 4
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13,14
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,16
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-44
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45-48
Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49-53
Typical Piping and Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .55-57
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58,59
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-62
