11
Matching 38AU Model To Evaporator Coil
The Model 38AUZ is a single-circuit unit design,
requiring one set of refrigeration piping. Thi s model can
be connected to an evaporator coil with one circuit or with
two circuits (by manifolding t he evaporator connections
into a single piping system).
The Model 38AUD is a dual-circuit unit design that
requires two sets of refrigeration piping bet ween the
outdoor unit and the evaporator coil (or coils). This model
can only be connected to an evaporator coil that has two
refrigeration circuits (or to two separate evaporator coils).
The Model 38AUD CANNOT be connected to a
single-c ircuit evaporator coil. The Model 38AUD
CANNOT be field-converted t o a single-circuit design.
Table 3 – Evaporator Coil Connections
Evaporator Coil has Connect t o Mod el Notes
Single Circuit 38AUZ ONLY
Two Circuits
38AUZ
Manifold evaporator
circuits into single
piping system
Or
38AUD Use two separate
piping systems
Before unpacking this new 38AU model, compare the
evapora tor coil design to the 38AU model.
.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 installa-
tion requirements.
2. Determine unit loca tion (from project plans) or selec t
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
The 38AU units are designed and approved for outdoor
installation only. Do not locat e these units indoors. Do not
add ducting to unit fan system.
Selec t a location for the unit and its support system (pad,
rails or ot her) 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. 5.
Note: Local codes may require different clearances than
specified in Fig. 5. It is the responsibility of installers to
be knowledgeable in local codes and to modify the
recommended clearances to satisfy local codes.
Note: Consider also the effect of adjacent units on
airflow performance and control box safety clearance.
LEFT:
Min 18” (457 mm)
requried for service
RIGHT:
Min 18” (457 mm)
requried for service
REAR:
Min 18” (457 mm)
requried for service
Note: Observe requirements for 39” (914 mm) operating clearance
on either Left or Rear coil opening.
FRONT:
42” (1067 mm)
requried for service
C10201
Fig. 5 -- Service Clearance Dimensional Drawing
Do not install the outdoor unit in an area where fresh air
supply to the outdoor coil may be restrict ed 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 a nd required line length for
interconnecting refrigeration piping, including suction
riser requirements (outdoor unit above indoor unit), liquid
line lift (outdoor unit below indoor unit) and hot gas
bypass line. Relocate sections to minimize t he length of
interconnecting tubing.
DO NOT BURY REFRIGERATION LINES.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs t o fall onto
the unit.
Step 2 — Complete Pre-Installation Checks
Ch eck Un it Electrical Cha ract eris tics: Confirm before
installatio n of unit that voltage, amperage and circuit
protectio n requir ements 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 locat ion.
Inspect Shipment: File a claim with shipping company if
the shipment is damaged or incomplete.
Consider System Requirements:
S Consult local building codes and National Electrical Code
(N EC, U.S.A .) for special ins tallation requir ements.
S Allow sufficient space for airflow clearance, wiring,
refrigerant piping, and servicing unit. See Fig. 3 and
Fig. 4 for unit dimensions and weight distribution data.
S Locate the unit so that t he outdoor coil (condenser)
airflow is unrestricted on all sides and above.
S The unit may be mounted on a level pa d directly on the
base c hannels or mounted on raised pads at support
points. See Tables 1A through 2B for unit operating
weights. See Fig. 3 and Fig. 4 for weight distributi on
based on recommended support points.
38AU
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