Step 5 - Field Fabricate Ductwork; Step 6 - Rig And Place Unit - Carrier WeatherExpert 48LC Installation Instructions Manual

Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.5 in. wg (87 Pa) with economizer or
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 supply
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
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.
A minimum clearance is not required around ductwork.
CAUTION
!
PROPERTY DAMAGE HAZARD
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.
"B"
UNIT
LB
48LC**14 2135
48LC**17 2377
48LC**20 2483
48LC**24 2629
48LC**26 2774
NOTES:
1. Dimensions in ( ) are inches.
2. 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.
"914-1371"
(36"-54")
SEE DETAIL A
"C"
"A"
MAX WEIGHT
KG IN
970 127.8
1080 141.5
1129 141.5
1195 157.8
1261 157.8
Fig. 11 - - Rigging Details
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 1 (on page 14) and Fig. 11 (below)
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 when packaging
is removed.
Before setting the unit onto the curb, recheck gasketing on
curb.
PLACE ALL SEAL STRIP
IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
DIMENSIONS
A B
MM IN
3249 59.1
3595 65.5
3595 65.5
4007 72.8
4007 7208
20
CAUTION
DETAIL A
C
MM IN
1501 52.3
1664 60.3
1664 60.3
1849 60.3
1849 60.3
C09107
MM
1328
1532
1532
1532
1532