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Step 2 — Complete Pre-Installation Checks
CHECK UNIT ELECTRICAL CHARACTERISTICS
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data plate
agree with power supply provided.
UN-CRATE UNIT
Remove unit packaging except for the top skid assembly,
which should be left in place until after the unit is rigged into
its final location.
INSPECT SHIPMENT
File a claim with shipping company if the shipment is dam-
aged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
Consult local building codes and National Electrical Code
(NEC, U.S.A.) for special installation requirements.
Allow sufficient space for airflow clearance, wiring, refriger-
ant piping, and servicing unit. See Fig. 2 for unit dimensions
and Table 4 for weight distribution data.
Locate the unit so that the outdoor coil (condenser) airflow is
unrestricted on all sides and above.
The unit may be mounted on a level pad directly on the
base channels or mounted on raised pads at support
points. See Table 4 for weight distribution based on rec-
ommended support points.
NOTE: If vibration isolators are required for a particular
installation, use the data in Table 4 to make the proper
selection.
Step 3 — Prepare Unit Mounting Support
SLAB MOUNT
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron in
front of condenser coil air inlet to prevent grass and foliage
from obstructing airflow.
Rig and Mount the Unit
CAUTION
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.
If using top crate as spreader bar, once unit is set,
carefully lower wooden crate off building roof top to
ground. Ensure that no people or obstructions are below
prior to lowering the crate.
RIGGING
These units are designed for overhead rigging. Refer to the
rigging label for preferred rigging method. Spreader bars are
not required if top crating is left on the unit. All panels must
be in place when rigging. As further protection for coil faces,
plywood sheets may be placed against the sides of the unit,
behind cables. Run cables to a central suspension point so
that the angle from the horizontal is not less than
45 degrees. Raise and set the unit down carefully.
If it is necessary to roll the unit into position, mount the unit
on longitudinal rails, using a minimum of 3 rollers. Apply
CAS-072-153-01SI Rev. A
force to the rails, not the unit. If the unit is to be skidded into
position, place it on a large pad and drag it by the pad. Do
not apply any force to the unit.
Raise from above to lift the unit from the rails or pad when
unit is in its final position.
After the unit is in position, remove all shipping materials
and top crating.
Step 4 — Determine Refrigerant Line Sizes
Select
CAS072/091/121/151 and CAS123/153 unit from the ap-
propriate tables.
Determine the linear length of interconnecting piping re-
quired between the outdoor unit and indoor unit (evapora-
tor). Consider and identify also the arrangement of the tub-
ing path (quantity and type of elbows in both lines), liquid
line solenoid size, filter drier and any other refrigeration spe-
cialties located in the liquid line. Refer to the indoor unit in-
stallation instructions for additional details on refrigeration
specialties devices.
Determine equivalent line length adjustments for path and
components and add to linear line lengths. See Table 7,
Equivalent Lengths for Common Fittings, for usual fitting
types. Also identify adjustments for refrigeration specialties.
NOMINAL
TUBE OD
(in.)
3/8
1/2
5/8
3/4
7/8
1-1/8
1-3/8
1-5/8
NOMINAL
TUBE OD
1-1/8
1-3/8
1-5/8
2-1/8
NOTE: Equivalent line lengths will vary based on tube diam-
eter. Calculate equivalent line length for each pipe by add-
ing equivalent length adjustments to linear lengths for each
pipe.
Enter the appropriate table to select the recommended line
sizes.
Specifications subject to change without notice.
the
recommended
Table 7 — Equivalent Lengths for
Common Fittings (ft)
90° Std
90° Lrad 90° Street
1.3
0.8
1.4
0.9
1.6
1.0
1.8
1.2
2.0
1.4
2.6
1.7
3.3
2.3
4.0
2.6
Branch
(in.)
Flow
No Reduct
3/8
2.6
0.8
1/2
2.7
0.9
5/8
3.0
1.0
3/4
3.5
1.2
7/8
4.0
1.4
5.0
1.7
7.0
2.3
8.0
2.6
10.0
3.3
UNIT
CAS072/091/121/151
CAS123/153
line
sizes
ELBOWS
90° Std
90° Street
2.2
0.6
1.0
2.3
0.7
1.1
2.5
0.8
1.3
2.9
0.9
1.5
3.2
0.9
1.6
4.1
1.3
2.1
5.6
1.7
3.0
6.3
2.1
3.4
TEES
Straight-Thru
Reduce
Reduce
25%
50%
1.1
1.3
1.2
1.4
1.4
1.6
1.7
1.8
1.9
2.0
2.3
2.6
3.1
3.3
3.7
4.0
4.7
5.0
QUANTITY OF
TABLE
LINE SETS
8
1
9
2
for
7
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