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

REQUIRED
SPREADER
BARS
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.
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.

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 and
4
the base rail inside the front and rear, 0.0-in. clearance between 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
(6.4 mm).
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
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 mechanical draft
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"B"
36"- 54"
(914-1371)
"C"
"A"
SEE DETAIL "A"
UNIT MAX WEIGHT
lb
760
895
930
CAUTION
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PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
A
kg in. mm
345 74.5 1890
407 74.5 1890
423 74.5 1890
Fig. 9 — Rigging Details
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
1 / -in.
materials.
4
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 option
may be field-converted to horizontal ducted configuration. To
convert to horizontal configuration, remove screws from side duct
opening covers (see Fig. 10) 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 covered by the tape used to
secure the insulation to the basepan and are not easily seen. See
Fig. 11 for position of the notches in the basepan. Seals around
duct openings must be tight. Secure with screws as shown in
Fig. 12. Cover seams with foil duct tape.
Field-supplied flanges should be attached to horizontal duct open-
ings and all ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof or build-
ing openings with counter flashing and mastic in accordance with
applicable codes.
Do not cover or obscure visibility to the unit's informative data
plate when insulating horizontal ductwork.
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DETAIL "A"
DIMENSIONS
B
in. mm in.
38.0 965 33.5
38.0 965 41.5
37.5 955 41.5
C
mm
850
1055
1055