Bryant 580D - Manual (Page 65)

APPLICATION DATA
1. DUCTWORK (580D036-150) — Secure vertical discharge
ductwork to roof curb. For horizontal discharge applica-
tions, attach ductwork to unit, or field-supplied flanges can
be attached to horizontal discharge openings and all duct-
work attached to flanges.
2. DUCTWORK (579F180-300) — Ductwork should be at-
tached to the curb on all units. Interior installation may pro-
ceed before unit is set in place on roof. If ductwork will be
attached to the unit, do not drill in condensate drain pan
area — leaks may result. See figures on page 66 for in-
formation on field-installed concentric ductwork when
applicable.
3. TO CONVERT DURABLADE ECONOMIZER FROM VER-
TICAL DISCHARGE TO HORIZONTAL DISCHARGE
(580D036-150):
1. Remove economizer to gain access to return duct
opening.
2. Move the horizontal discharge duct opening covers to
the vertical discharge openings.
3. Rotate economizer 90 degrees (until the economizer
motor faces the condenser section).
4. Rotate the barometric relief damper 90 degrees (econo-
mizer only).
5. Install block-off plate over the opening on the access
panel.
NOTE: Parablade economizer is for vertical discharge units
only.
4. THRU-THE-CURB SERVICE CONNECTIONS (579F180-
300) — Roof curb connections allow field power wires, con-
trol wires, and gas supply to enter through the roof curb
opening.
5. THRU-THE-BOTTOM SERVICE CONNECTIONS
(580D036-150) — An accessory kit is required for proper
installation of thru-the-bottom connections.
6. THERMOSTAT — Use of 2-stage cooling thermostat is rec-
ommended for all units. A 2-stage cooling thermostat is
required on units with accessory economizer to provide
integrated cooling.
7. HEATING-TO-COOLING CHANGEOVER — All units are
automatic changeover from heating to cooling when auto-
matic changeover thermostat and subbase are used.
8. AIRFLOW — Units are draw-thru on cooling and blow-thru
on heating.
9. MAXIMUM AIRFLOW — To minimize the possibility of con-
densate blow-off from evaporator, airflow through units
should not exceed 500 cfm/ton on size 036-240 units, and
11,250 cfm on size 028 units.
10. MINIMUM AIRFLOW — The minimum airflow for cooling is
300 cfm/ton on size 036-240 units and 280 cfm/ton on size
300 units. Refer to Heating Capacities and Efficiencies
table on page 7 for minimum airflow cfm for heating on size
180-300 units.
11. MINIMUM AMBIENT COOLING OPERATION TEMPERA-
TURE (580D036-150) — The cooling temperature for size
036-150 standard units is 25 F. With accessory Motor-
master
ா control units can operate at outdoor temperatures
down to −20 F.
12. MINIMUM AMBIENT COOLING OPERATION TEMPERA-
TURE (579F180-300) — Units are designed to operate at
outdoor temperatures down to 40 F for 579F180, 35 F for
579F216 25 F for 579F240, and 48 F for 579F300. To op-
erate at lower outdoor-air temperatures, see Price Pages or
contact your local representative for appropriate accessory
combinations for specific applications.
13. MAXIMUM OPERATING OUTDOOR-AIR TEMPERA-
TURE — For cooling, this temperature is 115 F on size 036-
180 units, 125 F on size 216-300 units.
14. HIGH ALTITUDE — A change to the gas orifice may be re-
quired at high altitudes. Refer to Altitude Compensation
charts on pages 53 and 54.
15. MINIMUM TEMPERATURE — Air entering the heat ex-
changer in heating must be a minimum of 50 F continuous
and 45 F intermittent.
16. INTERNAL UNIT DESIGN — Due to the internal unit de-
sign (draw-thru over the motor), air path, and specially de-
signed motors, the full horsepower (maximum continuous
bhp) listed in the Physical Data table and the notes follow-
ing each Fan Performance table can be utilized with ex-
treme confidence.
Using 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.
65