Carrier 38AUZ User Manual download pdf (Page 7)

.INSTALLATION

Jobsite Survey

Complete the following checks before installation.

1. Consult local building codes and the NEC (National

Electrical Code) ANSI/NFPA 70 for special installation

requirements.

2. Determine unit location (from project plans) or select unit

location.

3. Check for possible overhead obstructions which may in-

terfere with unit lifting or rigging.

Step 1 — Plan for Unit Location

Select a location for the unit and its support system (pad, rails

or other) that provides for the minimum clearances required for

safety. This includes the clearance to combustible surfaces, unit

performance and service access below, around and above unit

as specified in unit drawings. See Fig. 4.

NOTE: Consider also the effect of adjacent units on airflow

performance and control box safety clearance.

Do not install the outdoor unit in an area where fresh air supply

to the outdoor coil may be restricted or when recirculation 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 interconnecting

refrigeration piping, including suction riser requirements (out-

door unit above indoor unit), liquid line lift (outdoor unit below

indoor unit) and hot gas bypass line. Relocate sections to mini-

mize the length of interconnecting tubing.

Although unit is weatherproof, avoid locations that permit

water from higher level runoff and overhangs to fall onto the

unit.

Fig. 4 — Service Clearance Dimensional Drawing

Step 2 — Complete Pre-Installation Checks

CHECK UNIT ELECTRICAL CHARACTERISTIC —

Confirm before installation of unit that voltage, amperage and

circuit protection requirements listed on unit data plate agree

with power supply provided.

UNCRATE 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 compa-

ny 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,

refrigerant piping, and servicing unit. See Fig. 1 for unit

dimensions and weight distribution data.

• Locate the unit so that the outdoor coil (condenser) air-

flow 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 Tables 1A and 1B for unit operating weights.

See Fig. 1 for weight distribution based on recommended

support points.

NOTE: If vibration isolators are required for a particular

installation, use the data in Fig. 1 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.

Step 4 — Rig and Mount the Unit

RIGGING — These units are designed for overhead rigging.

Refer to the rigging label for preferred rigging method. Spread-

er bars are not required if top crating is left on the unit. All pan-

els 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 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 — Complete Refrigerant Piping

Connections

PROVIDE SAFETY RELIEF — The 38AUZ unit is provided

with a fusible joint in the suction line in accordance with

applicable UL standards for pressure relief. If local codes

dictate an additional safety relief device, purchase locally and

install locally. Installation will require the recovery of the

factory shipping charge before the factory tubing can be cut

and the supplemental relief device is installed.

SIZE REFRIGERANT LINES — Consider the linear length

of piping required between the outdoor unit and indoor unit

(evaporator), the amount of liquid lift (indoor section installed

above the outdoor section), and compressor oil return.

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

DO NOT BURY REFRIGERATION LINES.

REAR:

Min 18” (457 mm)

requried for service

Note: Observe requirements for 39” (914 mm) operating clearance

on either Left or Rear coil opening.

RIGHT:

Min 18” (457 mm)

requried for service

LEFT:

Min 18” (457 mm)

requried for service

FRONT:

42” (1067 mm)

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.

IMPORTANT: Do not bury refrigerant piping underground.

IMPORTANT: A refrigerant receiver is not provided with

the unit. Do not install a receiver.

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Carrier 38AUZ User Manual Page 7

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