4
IMPORTANT
: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket with the roof curb as shown in
Fig. 1. Improperly applied gasket can also result in air leaks and
poor unit performance. Do not slide unit to position on roof curb.
Alternate Unit Support
When a curb cannot be used, install unit on a noncombustible
surface. Support unit with sleepers, using unit curb support area. If
sleepers cannot be used, support long sides of unit with a minimum
of 3 equally spaced 4--in. x 4--in. pads on each side.
Step 2 — Rig and Place Unit
Inspect unit for transportation damage. See Table 1 for physical
data. File any claim with transportation agency.
PERSONAL INJURY AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roof.
All panels must be in place when rigging.
CAUTION
!
Do not drop unit; keep upright. Use wooden top skid or spreader
bars over unit to prevent sling or cable damage. Rollers may be
used to move unit across a roof. Level by using unit rail as a
reference; leveling tolerance is
±
1
/
16--
in. per linear ft in any
direction. See Fig. 3 for additional information. Unit rigging
weight is shown in Fig. 3.
Rigging holes are provided in the unit base rails as shown in Fig. 3.
Refer to rigging instructions on unit.
Positioning
Maintain clearance, per Fig. 2, around and above unit to provide
minimum distance from combustible materials, proper airflow, and
service access. See Fig. 4 for panel and filter locations.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air.
After unit is in position, remove top crating and polyethylene
sheet.
Roof Mount
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 1.
Installation Onto Curb
The 50PG units are designed to fit on the accessory full perimeter
curb. In either case, correct placement of the unit onto the curb is
critical to operating performance. To aid in correct positioning,
place unit on roof curb to maintain
1
/
4
--in. gap between the inside
of rail and roof curb on long sides and a
1
/
2
--in. gap between the
inside of rail and roof curb on both duct and condenser ends. Refer
to Fig. 1 and 2, to assure proper duct opening alignment.
NOTE
: Make sure the bottom drain condensate connection plug is
tight before installing unit on curb. See Step 5 -- Install External
Trap for Condensate Drain.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Do not slide unit to position when it is sitting on the curb.
Curb gasketing material may be damaged and leaks may
result.
CAUTION
!
Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6--in.
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.
Hook rigging shackles through holes in base rail, as shown in
Detail A. Holes in base rails are centered around the unit
center of gravity. Use wooden top skid, when rigging, to
prevent rigging straps from damaging unit.
CAU
O
TI
ACCESS PANEL MUST BE IN PLACE WHEN RIGGING.
N - NOTICE TO R GGERS:
I
UNIT
SIZE
A
B
C
D
E
MAX. WEIGHT
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
lb
kg
90.4
2296
36-54
914-1371
52.4
1331
48.0
1219
26.3
668
1617
735
08-14
C07192
Fig. 3 -- 50PG Rigging Label
50PG08
--
14
