Bryant 549B User Manual
Page 165
165
APPLICATION DATA
1. OUTDOOR INSTALLATION — Units approved for outdoor
installation only.
2. DUCTWORK — Secure vertical discharge ductwork to roof
curb. For horizontal discharge applications, either attach
ductwork to unit, or use field-supplied flanges attached to
the horizontal discharge openings and attach all ductwork
to flanges.
3. HORIZONTAL ECONOMI$ERIV — A field-installed acces-
sory is available for horizontal discharge applications. Field-
installed power exhaust accessory also available for vertical
or horizontal EconoMi$erIV applications.
4. THRU-THE-BOTTOM POWER CONNECTIONS — For
applications requiring thru-the-bottom connections, Bryant
accessory thru-the-bottom package must be purchased to
ensure proper connections.
5. THERMOSTAT — Use of 2-stage heating and cooling ther-
mostat is recommended for all units. A 2-stage cooling ther-
mostat is required on units with accessory economizer to
provide integrated cooling. A two-stage thermostat is
required for all size 090-180 units.
6. HEATING-TO-COOLING CHANGEOVER — All units are
automatic changeover from heating to cooling when auto-
matic changeover thermostat and subbase are used.
7. AIRFLOW — Units are draw-thru on cooling and blow-thru
on heating.
8. MAXIMUM AIRFLOW — To minimize the possibility of con-
densate blow-off from indoor coil, airflow through units
should not exceed 500 cfm/ton.
9. MINIMUM AIRFLOW — For cooling, minimum airflow is
300 cfm/ton. For 548F units with electric heating, the
required minimum cfm is 900 for 548F036; 1200 for
548F048; 1500 for 548F060; 1800 for 548F072; 2250 for
548F090; 2500 for 548F102; and 3000 for 548F120, with
the following exceptions:
For 542J, 549B, and 549C units with electric heating, required
minimum cfm is 600 for 549C024, 900 for 549B/C036, 1200 for
549B/C048, 1500 for 549B/C060, 1700 for 549B072, 2250 for
549B090, 3000 for 549B120, 3900 for 542J150, and 4500 for
542J180, with the following exceptions:
10. MINIMUM AMBIENT COOLING OPERATING TEMPERA-
TURE — The minimum temperature for standard size 036-
120 units is 25 F. With accessory Motormaster® I, II, or IV
control, units can operate at outdoor temperatures down to
–20 F.
Unit sizes 150 and 180 are designed to operate at outdoor
temperatures down to 40 F. With accessory Motormaster I
control, units can operate at outdoor temperatures down to
–20 F.
11. INTERNAL UNIT DESIGN — Due to Bryant’s internal unit
design (draw-thru over the motor), air path, and specially
designed motors, the full horsepower (maximum continuous
bhp) listed in the Physical Data table and the notes
following each Fan Performance table can be utilized with
confidence.
Using Bryant motors with the values listed in the Physical
and Fan Performance Data tables will not result in nuisance
tripping or premature motor failure. The unit warranty will
not be affected.
12. CONDENSATE DRAIN PAN — A sloped condensate drain
pan is supplied on all units. The condensate pan must be
externally trapped. Condensate drains are located on both
the bottom and end of the unit.
13. FIELD-SUPPLIED FAN DRIVES — If the factory drive sets
must be changed to obtain other wheel speeds, consult the
nearest Browning Manufacturing Co. sales office with the
required new wheel speed and the data from Physical Data
tables (center distances, motor and fan shaft diameters,
motor horsepower) for a modified drive set selection. For
minor speed changes, the fan sheave size should be
changed. (Do not reduce the size of the motor sheave; this
will result in reduced belt horse-power ratings and reduced
belt life.)
14. CONDENSER COIL PROTECTION
Pre-Coated Aluminum-Fin Coils have a durable epoxy-
phenolic coating applied to the fin prior to the fin stamping
process to provide protection in mildly corrosive coastal
environments. Pre-coated coils have an inert barrier
between the aluminum fin and copper tube. This barrier
electrically disconnects the dissimilar metals to minimize
the potential for galvanic corrosion. This economical option
provides substantial corrosion protection beyond the stan-
dard uncoated coil construction.
Copper-Fin Coils provide increased corrosion resistance
in moderate coastal environments where industrial air pollu-
tion is not present. All copper coils eliminate bi-metallic con-
struction to eliminate the potential for galvanic corrosion.
Application in industrial environments is not recommended
due to potential attack from sulfur, sulfur oxide, nitrogen
oxides, carbon and several other industrial airborne con-
taminants. In moderate seacoast environments, copper-fin
coils have extended life compared to standard or pre-
coated aluminum-fin coils.
E-Coated Aluminum-Fin coils undergo a precisely con-
trolled scientific process that bonds an impermeable epoxy
coating to the specially prepared fin coil surface. E-Coating
produces a smooth, consistent coating that is less brittle,
more resilient and more durable than previous postcoating
processes. E-Coated aluminum-fin coils offer economical
protection and improved coil life in many contaminated
environments.
E-Coated Copper-Fin Coils provide maximum protection
in virtually all environments, this option combines the
continuous, impenetrable barrier of the E-Coating process
with the natural resistance of an all-copper construction.
E-Coated copper-fin coil assemblies ensure long life, even
in environments that combine harsh coastal conditions with
industrial contamination.
UNIT
548F
UNIT
VOLTAGE
HEATER
kW
UNIT
CONFIGURATION
REQUIRED
MINIMUM
CFM
120
208/230
42.4
Horizontal
3200
208/230
50.0
Horizontal
3200
460
50.0
Horizontal
or
Vertical
3200
090-120
575
17.0
Horizontal
or
Vertical
2800
34.0
2350
UNIT
549B
UNIT
VOLTAGE
HEATER
kW
UNIT
CONFIGURATION
REQUIRED
MINIMUM
CFM
120
208/230
50.0
Horizontal
or
Vertical
3250
460
50.0
Horizontal
or
Vertical
3400