Slab Mount (Horizontal Units Only); Alternate Unit Support (In Lieu Of Curb Or Slab Mount); Step 5 - Field Fabricate Ductwork; Step 6 - Rig And Place Unit - Bryant 548J***D Series Installation Instructions Manual

Fig. 9 - - Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru- - the- - base power
package must be installed before the unit is set on the roof
curb.
If electric and control wiring is to be routed through the
basepan remove knockouts in basepan located in control
box area, see Fig. 10 for location. Attach the service
connections to the basepan.
Control Box
Access Panel
Filter and
Indoor Coil
Access Panel
Indoor Blower
Access Panel
Electric Heat
Access Panel
Fig. 10 - - Typical Access Panel Locations
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6–in. (150 mm) beyond unit cabinet. Install a 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.
Alternate Unit Support
(In Lieu of Curb or Slab Mount) —
A non- - combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 4 equally
spaced 4- - in. x 4- - in. (102 mm x 102 mm) pads on each
side. Locate pads so that they support the rails. Make sure
to avoid the fork openings.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5" (13) 1.0" (25) 1.0" (25)
a50--- 9658
Compressor
(each side)
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated 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
applicable fire codes.
For units with accessory electric heaters, minimum clearance
is not required around ductwork. One inch (25 mm)
clearance to combustible materials must be maintained for
the first 48 inches (1220 mm) of ductwork exiting the unit.
This applies to horizontal and vertical applications.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90- - degree elbow must be provided in the
ductwork to comply with UL (Underwriters Laboratories)
code for use with electric heat.
!
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal
injury.
For vertical supply and return units, tools or parts
could drop into ductwork and cause an injury. Install
a 90- - degree turn in the return ductwork between the
unit and the conditioned space. If a 90- - degree elbow
cannot be installed, then a grille of sufficient strength
and density should be installed to prevent objects
from falling into the
electric heater, supply duct will require 90- - degree
elbow.
C09118
Step 6 — Rig and Place Unit
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 Table 4 (on page 12) and Fig. 11 for
additional information.
Lifting holes are provided in base rails as shown in Fig. 11.
Refer to rigging instructions on unit.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
Before setting the unit onto the curb, recheck gasketing on
curb.
15
WARNING
conditioned space. Due to
CAUTION