Carrier WeatherMaker 48TC 04, Installation Instructions Manual

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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. For vertical ducted applications, secure all
ducts to roof curb and building structure. Do not connect
ductwork to unit. Fabricate supply ductwork so that the cross
sectional dimensions are equal to or greater than the unit sup-
ply duct opening dimensions for the first 18 in. (458 mm) of
duct length from the unit basepan. 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 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 applicable fire codes.
A minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit —
Keep unit upright
and do not drop. Spreader bars are required. Rollers may be
used to move unit across a roof. Level by using unit frame as a
reference. See Table 2 and Fig. 6 for additional information.
Lifting holes are provided in base rails as shown in Fig. 6.
Refer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood to prevent
base pan damage) must be removed PRIOR to placing the unit
on the roof curb. When using the standard side drain connec-
tion, ensure the red plug in the alternate bottom connection is
tight. Do this before setting the unit in place. The red drain pan
can be tightened with a 1 /
2
-in. square socket drive extension.
For further details see Step 11 — Install External Condensate
Trap and Line on page 14.
Before setting the unit onto the curb, recheck gasketing on
curb.
POSITIONING ON CURB — Position unit on roof curb so
that the following clearances are maintained: 1 /
4
in. (6.4 mm)
clearance between the roof curb and the base rail inside the
front and back, 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 1 /
4
in.
(6.4 mm).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Flue vent discharge must have a minimum horizontal clear-
ance of 4 ft (1220 mm) from electric and gas meters, gas regu-
lators, and gas relief equipment. Minimum distance between
unit and other electrically live parts is 48 inches (1220 mm).
Flue gas can deteriorate building materials. Orient unit such
that flue gas will not affect building materials. Locate mechani-
cal 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.
Fig. 6 — Rigging Details
CAUTION
Failure to follow this caution may result in damage to
roofing materials.
Membrane roofs can be cut by sharp sheet metal edges.
Be careful when placing any sheet metal parts on such roof.
CAUTION
Failure to follow this caution may result in equipment
damage.
All panels must be in place when rigging. Unit is not de-
signed for handling by fork truck.
DETAIL "A"
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
SEE DETAIL "A"
"A"
(914-1371)
36"- 54"
"C"
"B"
SPREADER
BARS
REQUIRED
NOTES:
1. SPREADER BARS 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.
4. Max weight includes base unit plus shipping pallet plus all available FIOPs which could be on that size unit.
UNIT
MAX WEIGHT
DIMENSIONS
A B C
LB KG LB KG LB KG LB KG
48TC-A04 772 350 74.5 1890 39.0 990 33.5 850
48TC-A05 826 375 74.5 1890 39.0 990 33.5 850
48TC-A06 896 406 74.5 1890 39.0 990 33.5 850
48TC-A07 1075 489 74.5 1890 39.0 990 41.5 1055