Bryant 558F User Manual

Page 60

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APPLICATION DATA

1. Units approved for outdoor installation only.

2. Ductwork (036-150) — Secure vertical discharge ductwork

to roof curb. For horizontal discharge applications, either at-
tach ductwork to unit, or use field-supplied flanges attached
to the horizontal discharge openings and attach all duct-
work to flanges.

3. Ductwork (180-300) — Ductwork should be attached to the

curb on all units. Interior installation may proceed before
unit is set in place on roof. If ductwork is to be attached to
unit, do not drill in condensate drain pan area — leaks may
result. Field-fabricated concentric ductwork may be con-
nected as shown on page 61.

4. On 180-300 size units with electric heat, a field-supplied

90° elbow must be installed in the supply ductwork below
the unit discharge connection.

5. To convert from vertical discharge to horizontal discharge

(036-150):

a. Remove Durablade economizer or two-position damper

to gain access to return duct opening.

b. Move the horizontal-discharge duct opening covers to

the vertical discharge openings.

c. Rotate economizer or two-position damper 90 degrees.

d. Rotate the barometric relief damper 90 degrees.

e. Install block-off plate over the opening on the access

panel.

NOTE: Parablade economizer is only used for vertical dis-
charge units.

6. Roof curb connections allow field power wires and control

wires to enter through the roof curb opening.

7. Use of 2-stage heating and cooling thermostat is recom-

mended for all units. A 2-stage cooling thermostat is re-
quired on units with accessory economizer to provide
integrated cooling.

8. All units are automatic changeover from heating to cooling

when automatic changeover thermostat and subbase are
used.

9. Units are draw-thru on cooling and blow-thru on heating.

10. To minimize the possibility of condensate blow-off from

evaporator, airflow through units should not exceed
500 cfm/ton on 036-240 units and 11,250 cfm on 300 units.

11. For cooling minimum airflow is 300 cfm/ton for 036-240

units and 280 cfm/ton on 300 units. For units with electric
heating, required minimum cfm is 900 for 036; 1200 for 048;
1500 for 060; 1800 for 072; 2250 for 090; 2550 for 102; and
3000 for 120 and 150, with the following exceptions:

UNIT
558D

UNIT

VOLTAGE

HEATER

kW

UNIT

CONFIGURATION

REQUIRED

MINIMUM

CFM

120,
150

208/230

42.4

Horizontal

3200

208/230

50.0

Horizontal

3200

460

50.0

Horizontal or

Vertical

3200

090-
150

575

18.0

Horizontal or

Vertical

2800

36.0

2350

NOTE: The 180-300 units with electric heating have a required
minimum heating of 300 cfm/ton.

12. Minimum

ambient

cooling

operating

temperature

(036-150) — The minimum temperature for size 036-150
standard units is 25 F. With accessory low-ambient kit, units
can operate at outdoor temperatures down to –20 F.

13. Minimum

ambient

cooling

operation

temperature

(180-300) — Units are designed to operate at outdoor tem-
peratures down to 40 F for 180, 35 F for 216, 25 F for 240,
and 48 F for 300. To operate at lower outdoor temperatures,
see Trade Prices or contact your local representative for
appropriate accessories.

14. Due to the internal unit design (draw-thru over the motor),

air path, and specially designed motors, the full horsepower
(maximum continuous bhp) listed in the Specifications table
and the notes following each Air Delivery table can be uti-
lized with confidence.

Using motors with the values listed in the Specifications
table

will not

result in nuisance tripping or premature motor

failure. The unit warranty will not be affected.

60

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