Trane RAUC-IOM-15, Installation & Maintenance Instructions Manual

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Installation (Continued)
Rigging
A Rigging illustration and Center-of-Gravity dimensional
data table is shown in Figure 3-3. Refer to the typical unit
operating weights table before proceeding.
1. Rig the condensing unit as shown in Figure 3-3. Attach
adequate strength lifting slings to all four lifting brackets
in the unit base rail. Do not use cables, chains, or slings
except as shown.
2. Install spreader bars, as shown in Figure 3-3, to protect
the unit and to facilitate a uniform lift. The minimum dis-
tance between the lifting hook and the top of the unit
should be 7 feet.
3. Test-lift the unit to ensure it is properly rigged and bal-
anced, make any necessary rigging adjustments.
4. Lift the unit and position it into place.
Unit Isolation
To minimize unit sound and vibration transmission, one of
the following installation methods should be used:
1. Install the unit directly on an isolated (detached) concrete
pad or on isolated concrete footings located at each unit
load point.
2. Install the optional spring isolators at each mounting lo-
cation. Refer to the following “Spring Isolator” section.
Spring Isolators
Install the spring isolators at each unit mounting (load)
point, using the following procedure:
1. Elevate the unit (one side at a time) to allow access to
the base rail mounting holes.
Note: Use solid type blocks, i.e. 4" X 4" wood
blocks or similar material to prevent collapsing.
Keep hands and other body limbs clear of elevated
base rail while installing isolators to prevent
personal injury.
2. Align the mounting holes in the base rail of the unit with
the positioning pin in the top of the appropriate isolator.
Refer to Figure 3-4 for the appropriate isolator for each
load point.
3. Position the isolator to allow access to the mounting
holes in the base of the isolator.
4. Lower the unit onto the isolator. The positioning pin on
the isolator must engage into the hole of the base rail.
The clearance between the upper and lower isolator
housings should be approximately 1/4 to 1/2 inch. Refer
to Figure 3-4. A clearance greater than 1/2 inch indicates
that shims are required to level the unit. Refer to the
“Leveling the Unit” section.
5. Make minor clearance adjustments by turning the isolator
leveling bolt (Figure 3-4) clockwise to increase the clear-
ance and counterclockwise to decrease the clearance. If
proper isolator clearance cannot be obtained by turning
the leveling bolt, level the isolators themselves. A 1/4
inch variance in elevation is acceptable.
6. Secure the isolator to the mounting surface using the
base holes in the isolator.
7. After the unit is level, tighten the isolator base mounting
bolts to secure them to the mounting surface.