Positioning On Curb; Step 7 - Convert To Horizontal And Connect; Ductwork (When Required) - Carrier WeatherMaster 48HC04 Series Installation Instructions Manual

"B"
REQUIRED
SPREADER
BARS
UNIT
48HC-A04
48HC-A05
48HC-A06
NOTES:
1. SPREADER BARS ARE REQUIRED. Top damage will occur if
spreader bars are not used.
2. Dimensions in () are in millimeters.

POSITIONING ON CURB

Position unit on roof curb so that the following clearances are
maintained: 1 / -in. (6.4 mm) clearance between the roof curb
4
and the base rail inside the front and rear, 0.0-in. clearance be-
tween the roof curb and the base rail inside on the duct end of
the unit. This will result in the distance between the roof curb
and the base rail inside on the condenser end of the unit being
approximately / -in. (6.4 mm).
1
4
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
CAUTION
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 when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering the
crate.
Flue vent discharge must have a minimum horizontal clearance
of 4 ft (1220 mm) from electric and gas meters, gas regulators,
and gas relief equipment. Minimum distance between unit and
other electrically live parts is 48-in. (1220 mm).
Flue gas can deteriorate building materials. Orient unit such
that flue gas will not affect building materials. Locate mechan-
ical draft system flue assembly at least 48-in. (1220 mm) from
an adjacent building or combustible material.
NOTE: Installation of accessory flue discharge deflector kit will
reduce the minimum clearance to combustible material to 18-in.
(460 mm).
After unit is in position, remove rigging skids and shipping
materials.
36"- 54"
(914-1371)
"C"
"A"
SEE DETAIL "A"
MAX WEIGHT
lb kg in.
760 345 74.5
895 407 74.5
930 423 74.5
Fig. 6 — Rigging Details
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
DIMENSIONS
A
mm in.
1890 38.0
1890 38.0
1890 37.5
3. 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 to prevent rigging straps from damaging
unit.
Step 7 — Convert to Horizontal and Connect

Ductwork (When Required)

Unit is shipped in the vertical duct configuration. Unit without
factory-installed economizer or return-air smoke detector op-
tion may be field-converted to horizontal ducted configuration.
To convert to horizontal configuration, remove screws from
side duct opening covers (see Fig. 7) and remove covers. Use
the screws to install the covers on vertical duct openings with
the insulation-side down. The panels must be inserted into the
notches on the basepan to properly seal. The notches are cov-
ered by the tape used to secure the insulation to the basepan
and are not easily seen. See Fig. 8 for position of the notches in
the basepan. Seals around duct openings must be tight. Secure
with screws as shown in Fig. 9. Cover seams with foil duct
tape.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. In-
sulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accor-
dance with applicable codes.
Do not cover or obscure visibility to the unit's informative data
plate when insulating horizontal ductwork.
10
DETAIL "A"
B C
mm in.
965 33.5
965 41.5
955 41.5
mm
850
1055
1055