10
Fig. 5 — Rigging Details
Flue gas can deteriorate building materials. Orient unit
such that flue gas will not affect building materials. Locate
mechanical 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 ship-
ping materials.
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 de-
tector option may be field-converted to horizontal ducted
configuration. To convert to horizontal configuration, remove
screws from side duct opening covers (see Fig. 6) 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. 7 for position
of the notches in the basepan. Seals around duct openings
must be tight. Secure with screws as shown in Fig. 8. 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. Insulate and weatherproof all external ductwork,
joints, and roof or building 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.
Fig. 6 — Horizontal Conversion Panels
Fig. 7 — Location of Notches
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 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.
UNIT MAX WEIGHT
DIMENSIONS
ABC
lb kg in. mm in. mm in. mm
48FC**04 784 356 74.5 1890 37.6 955 33.5 850
48FC**05 890 404 74.5 1890 36.5 925 33.5 850
48FC**06 903 410 74.5 1890 36.5 925 33.5 850
48FC**07 1020 463 74.5 1890 36.0 915 41.5 1055
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
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