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REAR:
Min 18" (457 mm)
required for service
LEFT:
Min 18" (457 mm)
required for service
NOTE: Observe requirements for 39" (914 mm) operating
clearance on either Left or Rear coil opening.
Fig. 4 — Service Clearance Dimensional Drawing
Do not install the outdoor unit in an area where fresh air
supply to the outdoor coil may be restricted or when recircu-
lation from the condenser fan discharge is possible. Do not
locate the unit in a well or next to high walls.
Evaluate the path and required line length for intercon-
necting refrigeration piping, including suction riser require-
ments (outdoor unit above indoor unit), liquid line lift (out-
door unit below indoor unit) and hot gas bypass line. Relocate
sections to minimize the length of interconnecting tubing.
IMPORTANT: DO NOT BURY REFRIGERANT LINES
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
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
damaged 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, re-
frigerant piping, and servicing unit. See Fig. 3 for unit dimen-
sions and 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 Fig. 3
for weight distribution based on recommended support points.
NOTE: If vibration isolators are required for a particular installa-
tion, use the data in Fig. 3 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.
RIGHT:
Min 18" (457 mm)
required for service
FRONT:
42" (1067 mm)
required for service
Step 4 — Rig and Mount the Unit
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age or improper operation. Never install suction-line filter
drier in the liquid line of a Puron
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. Ap-
ply 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 5 — Determine Refrigerant Line Sizes
Select the recommended line sizes for 38AUZ and 38AUD
unit from the appropriate tables.
Determine the linear length of interconnecting piping re-
quired between the outdoor unit and indoor unit (evaporator).
Consider and identify also the arrangement of the tubing path
(quantity and type of elbows in both lines), liquid line solenoid
size, filter drier and any other refrigeration specialties located
in the liquid line. Refer to the indoor unit installation instruc-
tions for additional details on refrigeration specialties devices.
Determine equivalent line length adjustments for path and
components and add to linear line lengths. See Table 2,
Equivalent Lengths for Common Fittings, for usual fitting
types. Also identify adjustments for refrigeration specialties.
Refer to Part 3 of the Carrier System Design Manual for addi-
tional data and information on equivalent lengths.
MODEL POSITION
38AUZ/ALL
38AUD/A,B
38AUD/C
LIQUID LIFT
A liquid lift condition exists when the outdoor unit is lo-
cated below the indoor (evaporator) unit and liquid flows ver-
tically up in a portion of the liquid line. The vertical column
of liquid reduces the available state point sub-cooling at the
evaporator coil's thermal expansion valve. This effect reduc-
es the length of liquid lift (feet of elevation) that a liquid line
size can accommodate. Longer linear tube lengths will also
reduce the amount of liquid lift possible.
Check Tables
7
(38AUDC12) for maximum liquid lift capabilities for line
sizes. Reselect the liquid line tube size if necessary. If maxi-
mum available tube size cannot provide the required lift dis-
tance on this installation, relocate the outdoor unit to reduce
the equivalent line length or the lift requirement.
7
CAUTION
®
system.
QUANTITY OF LINE
TABLE
SETS
7
1
8
2
9
2
(38AUZ),
8
(38AUD),
and
9
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