Filter
Top Products
2
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.