Bryant 580F - Manual (Page 4)

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B. Alternate Unit Support
When the curb or adapter cannot be used, support unit with
sleepers using unit curb or adapter support area. If sleepers
cannot be used, support long sides of unit with a minimum of
three 4-in. x 4-in. pads, two at the corners and one at the
unit’s center of gravity. If more than 3 pads are used, equally
space them along the side.
C. Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. Install a 6-in. gravel apron in front of
condenser coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
II. STEP 2 — FIELD FABRICATE DUCTWORK
Secure all ducts to roof curb and building structure on verti-
cal units. Do not connect ductwork to unit. For horizontal
applications, field-supplied flanges should be attached to
horizontal discharge openings and all ductwork secured to
the flanges. Insulate and weatherproof all external duct-
work, joints, and roof openings with counter flashing and
mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insu-
lated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with appli-
cable fire codes.
A minimum clearance is not required around ductwork. Cab-
inet return-air static shall not exceed –.30 in. wg with
EconoMi$er+ or .45 in. wg without economizer.
These units are designed for a minimum heating operation
continuous return-air temperature of 50 F (dry bulb), or an
intermittent operation down to 45 F (dry bulb), such as when
used with a night set-back thermostat.
To operate at lower return air temperatures, a field-supplied
outdoor-air temperature control must be used to initiate both
stages of heat when the temperature is below 45 F. Indoor
comfort may be compromised when these lower air tempera-
tures are used with insufficient heating temperature rise.
III. STEP 3 — INSTALL EXTERNAL TRAP FOR CONDEN-
SATE DRAIN
The unit’s
3 /
4
-in. condensate drain connections are located on
the bottom and side of the unit. Unit discharge connections
do not determine the use of drain connections; either
drain connection can be used with vertical or horizontal
applications.
When using the standard side drain connection, make sure
the plug (Red) in the alternate bottom connection is tight
before installing the unit.
To use the bottom drain connection for a roof curb installa-
tion, relocate the factory-installed plug (Red) from the
bottom connection to the side connection. See Fig. 5A. The
piping for the condensate drain and external trap can be
completed after the unit is in place.
All units must have an external trap for condensate drain-
age. Install a trap a minimum of 4-in. deep and protect
against freeze-up. If drain line is installed downstream from
the external trap, pitch the line away from the unit at 1 in.
per 10 ft of run. Do not use a pipe size smaller than the unit
connection (
3 /
4
in.). See Fig. 5B.
The center drain plug looks like a star connection, however it
can be removed with a
1 /
2
in. socket drive extension.
IV. STEP 4 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency. Keep unit upright and do not drop.
Spreader bars are not required if top crating is left on unit.
Rollers may be used to move unit across a roof. Level by
using unit frame as a reference. See Tables 1A and 1B and
Fig. 6 for additional information. Operating weight is shown
in Table 1 and Fig. 6.
Lifting holes are provided in base rails as shown in Fig. 1
and 6. Refer to rigging instructions on unit.
CAUTION: All panels must be in place when rig-
ging and lifting.
Fig. 2 — Horizontal Conversion Panels