Bryant 549B User Manual
Page 2
2
TABLE OF CONTENTS
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . 4,5
ARI Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,6
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
548F
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15
Base Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16,17
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-54
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55-64
Typical Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . 65-67
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69-72
549B, 549C
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73-75
Base Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 76-78
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 79-80
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82-118
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119-130
Typical Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . 131-133
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . .134
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 135-139
542J
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
Base Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 142-144
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146-152
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
Typical Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . 154-156
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . .157
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 158-162
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163,164
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165-168
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169
DURABLE, DEPENDABLE CONSTRUCTION — Designed for
durability in any climate, the weather-resistant cabinets are
constructed of galvanized steel and bonderized, and all exterior
panels are coated with a prepainted baked enamel finish. The
paint finish is non-chalking, and is capable of withstanding
ASTM (American Society for Testing and Materials) B117
500-hour Salt Spray Test. All internal cabinet panels are primed,
permitting longer life and a more attractive appearance for the
entire unit.
In addition, all size 024-120 units are designed with a single,
continuous top piece to eliminate any possible leaks. Totally
enclosed outdoor-fan motors and permanently lubricated bear-
ings provide additional unit dependability.
Patented State-of-the-Art Chronotemp™ Defrost System
uses time and temperature to keep the outdoor coil frost-free for
economical, dependable operation. The Chronotemp defrost
board can be easily configured for defrost cycles every 30, 50,
or 90 minutes.
Dependable 4-Way Valve Operation safely and efficiently
accomplishes cycle reversals, defrost, and normal operation.
EASY INSTALLATION AND CONVERSION
All Units are Shipped in the Vertical Duct Configuration for
fit-up to standard roof curbs. (3 different curb sizes fit unit sizes
024-072, 090-120, and 150,180 respectively.) The contractor
can order and install the roof curb early in the construction
stage, before decisions on size requirements are made.
All units feature a base rail design with forklift slots and rigging
holes for easier maneuvering. Durable packaging protects all
units during shipment and storage.
The units can be easily converted from a vertical to a horizontal
duct configuration by relocating the panels supplied with the
unit.
To Convert 024-120 Units from vertical to horizontal discharge,
simply relocate 2 panels. The same basic unit can be used for a
variety of applications and can be quickly modified at the
jobsite.
To Convert Size 150 and 180 Units from vertical to horizontal
discharge, use the optional horizontal supply/return adapter
roof curb.
Convenient Duct Openings in the unit basepans permit side-
by-side or concentric duct connections (see Application Data
section) without requiring internal unit modification (size
150,180 only).
NOTE: On units using horizontal supply and return, the acces-
sory barometric relief or power exhaust MUST be installed on
the return ductwork.
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 pen-
etrations (to prevent water leaks). Power and control connec-
tions are made on the same side of the unit to simplify
installation.
The Non-Corrosive Sloped Condensate Drain Pan permits
either an external horizontal side condensate drain (outside the
roof curb) or an internal vertical bottom drain (inside the roof
curb). Both options require an external, field-supplied P-trap.
Standard 2-in. Throwaway Filters are easily accessed
through a removable panel located above the air intake hood.
No tools are required to change unit filters.
All 024-120 Units are Designed With a Single, Continuous
Top Piece to eliminate leaking at the seams or gasketing.
Belt-Driven Indoor-Fan Motors allow maximum on-site flexi-
bility without changing motors or drives.
Field-Installed Accessory Electric heaters are available in a
wide range of capacities. An available single-point wiring kit
makes installation simple.
Low Voltage Wiring Connections are easily made due to the
large terminal board which is located for quick, convenient
access.
In addition, color-coded wires permit easy tracing and
diagnostics.
PROVEN COMPRESSOR RELIABILITY
Design techniques feature computer-programmed balance
between compressor, condenser, and evaporator. Bryant-specified
hermetic compressors are equipped with compressor overcurrent
and overtemperature protection to ensure dependability.
All units have a fixed orifice metering device which precisely
controls refrigerant flow, preventing slugging and flood-back,
while maintaining optimum unit performance. Refrigerant filter
driers are standard.
Standard Low Ambient Cooling Operation to 25 F; optional
head pressure control kit available for outdoor ambient condi-
tions to –20 F.