Lifting And Rigging; Placing The Unit On The Mounting Curb - Trane 4DCY4024 Installer's Manual

Installer's Guide

Lifting and Rigging

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Improper Unit Lift!
Test lift unit approximately 24 inches to verify proper center
of gravity lift point. To avoid dropping of unit, reposition
lifting point if unit is not level. Failure to properly lift
unit could result in death or serious injury or possible
equipment or property-only damage.
IMPORTANT: Do not lift the unit without test lifting for balance
and rigging. Do not lift the unit in windy conditions or above
personnel. Do not lift the unit by attaching clevis, hooks, pins,
or bolts to the unit casing, casing hardware, corner lugs, angles,
tabs, or flanges. Failure to observe these warnings may result
in equipment damage.
1. Before preparing the unit for lifting, check the unit dimension draw-
ings for center of gravity for lifting safety (Figures 1 to 6, page
).
4-9 Because of placement of internal components, the unit's
weight may be unevenly distributed. Approximate unit weights
are also provided in the unit drawings.
NOTE: When unit rigging and hoisting it is recommended that
accessory kit BAYLIFT002B be used. It includes a kit of four
(4) lifting lugs. See Figure 10 inset B, on page 14.
2. Insert the four lifting lugs in the openings provided in the drip lip
on each end of the unit. See Figure 10 inset B on page 14. A
tap or jerk to the lug will overcome the interference that arises
due to the dimple on the lug.
3. When hoisting the unit, be sure that a proper method of rigging
is used. Use either the unit's top shipping skid with straps or
slings and spreader bars for protection during lifting. Always
test-lift the unit to determine the exact unit balance and stability
before hoisting it to the installation location.
4. When the curb and air ducts have been properly installed, the
unit is ready to be hoisted to the roof and set in position.
Page 12
Figure 8. Converting Horizontal to Down Airflow
WARNING
IMPORTANT: To prevent damage to the sides and top of the
unit when hoisting, retain the top shipping skid on the unit or
use "spreader bars" as shown on page 14.
IMPORTANT: The unit must be lowered into position. The P.V.C.
rubber tape on the curb flange permits the unit to be repositioned
if required without destroying the P.V.C. rubber seal affixed to
the mounting curb.

Placing the Unit on the Mounting Curb

1. The unit is designed with a perimeter drip lip that is lower than
the unit base pan, see Figure 10, inset A, on page 14.
2. Position the unit drip lip down over and in contact with the outside
corner of the curb, as illustrated in Figure 10, inset A, on page
14. Continue to lower the unit on top of the curb, with the unit
drip lip astraddle, and in contact with, both the end and side rail
of the curb. The unit should now rest on top of the curb. Use the
extreme mounting kit, BAYEXMK001A, to add additional hold
down strength to the mounting.
NOTE: The ductwork is installed as part of the curb installa-
tion. Do not attach ductwork to the unit and lower the unit with
ductwork onto the curb.