Bryant 581A - Manual

DESCRIPTION
The 581A gas heating/electric cooling rooftop units are de-
signed to deliver optimum performance and reliability in a com-
mercial rooftop unit.
The 13 to 20 ton units are one-piece gas heating, electric cool-
ing units that are prewired and precharged with R-22 at the fac-
tory, making jobsite installation easy. Every unit is factory run-
tested prior to shipment to ensure reliable installation.
The 581A units are designed to be field-convertible from vertical
supply/return to horizontal supply/return (using an accessory
horizontal supply curb or adapter), making them easily adapt-
able to a wide variety of new construction and replacement ap-
plications. For vertical supply/return jobs, ductwork can be
connected directly to the roof curb, allowing ductwork to be
completed before unit is available for installation. All units in-
clude easily replaceable internal filters.
The 581A units are available in a range of heating sizes and
voltage options to meet most job requirements. Low-voltage ter-
minal blocks make wiring connections quick and simple.
All units are listed with ETL (ETL Testing Laboratory) and ETLC
(ETL Testing Laboratory for Canadian certification). All units are
ARI (Air-Conditioning & Refrigeration Institute) approved and
comply with ASHRAE Standard 62 (American Society of Heat-
ing, Refrigeration, and Air Conditioning Engineers).
STANDARD FEATURES
INDUSTRY-LEADING COOLING EERS (Energy Efficiency Ra-
tios) assure minimum operating costs and will qualify for attrac-
tive utility rebates in many areas.
SEMI-HERMETIC COMPRESSORS are fully serviceable. They
are highly regarded and preferred by owners and users, and are
offered exclusively on the high-efficiency 13 to 20 ton 581A
units.
Two 06D semi-hermetic compressors on independent refrigera-
tion circuits are offered on the 180 and 240 units for 2 steps of
capacity control and redundancy. A single 06D semi-hermetic
compressor with unloading capability is offered on the 155 units.
All compressors have service valves and a full complement of
safety devices, including high- and low-pressure switches, over-
temperature protection, an electronic compressor lockout de-
vice, and crankcase heaters.
HIGH STATIC OVERSIZED FAN MOTORS AND VARIABLE-
PITCH BELT DRIVES are supplied standard from the factory to
provide up to 2 in. wg of external static pressure at 400 cfm per
ton with wet coils and clean filters installed. A 5 hp motor is pro-
vided standard on the 581A180 (15-ton unit), and a 10 hp motor
is standard on the 581A240 (20-ton unit).
EASY INSTALLATION makes these units perfect for vertical
supply and return roof curb mount applications on new con-
struction, retrofit, and replacement applications. The unique
industry-leading compact size and weight are favored by de-
signers, contractors, owners, and users, and are significant ad-
vantages in terms of minimizing required roof structures on new
construction and retrofit jobs.
The new 581A units can be easily converted to horizontal supply
and return with the new fan-performance-boosting horizontal
high-static regain adapter (part no. 389210-201 or 389211-201).
These vertical-to-horizontal supply/return adapters are not only
fully factory assembled with a built-in insulated transition duct,
they improve fan performance by as much as 0.6 in. wg of
static.
THE FACTORY-ASSEMBLED PACKAGE is a compact, fully
self-contained electric cooling/gas heating unit that is prewired,
prepiped, and precharged for minimum installation expense.
INTERNAL RETURN-AIR FILTERS are provided. Two-in.
throwaway filters are provided standard on all units, and can be
easily accessed. There is no need to field-fabricate filter racks
or install external filter accessories.
COMPRESSOR PROTECTION is assured. The 581A units
have high- and low-pressure protection external to the compres-
sor. These protections prohibit operation under abnormal unit
conditions.
DUAL COMPRESSORS AND DUAL REFRIGERATION CIR-
CUITS (180,240 units) are provided. Two compressors, each
on its own independent circuit, provide standby reliability and
high operating efficiency.
POWER, CONTROL, AND GAS CONNECTIONS are made on
the same side of the unit to simplify installation.
Model 581A155,180
Model 581A240
Bryant
Air Conditioning COMMERCIAL
SINGLE PACKAGE ROOFTOP
GAS HEATING/ELECTRIC COOLING UNITS Model 581A
Sizes 155-240
13 to 20 Tons
Form No. PDS 581A.155.2B