INSTALLATION
Specifications for this unit in residential new construction market
require the outdoor unit, indoor unit, refrigerant tubing sets,
metering device, and filter drier listed in presale literature. There
can be no deviation. Consult the Application Guideline and
Service Manual — Residential Split-System Air Conditioners and
Heat Pumps using Puron® Refrigerant to obtain required unit
changes for specific applications and for R-22 retrofit.
Step 1—Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton taking care not to damage
unit.
INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
Step 2—Install On a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to determine base pan size and knockout hole location.
On rooftop applications, mount on level platform or frame. Place
unit above a load-bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Application Guideline and Service
Manual — Residential Split-System Air Conditioners and Heat
Pumps using Puron® Refrigerant for wind baffle construction.
NOTE:
Unit must be level to within ± 2° (± 3/8 in./ft) per
compressor manufacturer specifications.
Step 3—Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a 6-in.
clearance on 1 side of unit and 12 in. on all remaining sides must
be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
Step 4—Operating Ambients
The minimum outdoor operating ambient in cooling mode is 55°F,
and the maximum outdoor operating ambient in cooling mode is
125°F.
Step 5—Check Indoor AccuRater® Piston and
Install Piston Ring (38EZA Standard)
If unit is to be installed with a piston metering device, proceed as
follows:
1. Check indoor coil piston to see if it matches the required
piston shown on outdoor unit rating plate. If it does not match,
replace indoor coil piston with piston shipped with outdoor
unit. The piston shipped with outdoor unit is correct for any
approved indoor coil combination.
2. After correct piston is installed, locate Teflon piston ring
shipped in piston bag. Install piston ring behind metering
piston as shown in Fig. 4. The piston ring ensures that piston
stays seated during all operating conditions.
NOTE:
If a Puron TXV is used with a Puron reciprocating
compressor, an appropriate accessory hard start kit (capacitor and
relay) must be used. For the appropriate accessory hard start kit see
the Product Data Digest.
Step 6—TXV Installation (38ETA and 38ESA Required)
NOTE:
All 38ETA and 38ESA units MUST be installed with a
hard shut off Puron® TXV.
The thermostatic expansion valve is specifically designed to
operate with Puron®. Do not use an R-22 TXV. An existing R-22
TXV must be replaced with a factory-approved TXV specifically
designed for Puron®. To replace an R-22 TXV, refer to Installa-
tion Instructions packaged with accessory kit.
NOTE:
FK4 and FC4 fan coils are equipped with an R-22 TXV.
If an FK4 or an FC4 fan coil is used with a Puron® air conditioner,
the R-22 TXV must be replaced with a Puron® TXV.
Fig. 2—Connecting Tubing Installation
A01383
INSULATION
VAPOR TUBE
LIQUID TUBE
OUTDOOR WALL
INDOOR WALL
LIQUID TUBE
VAPOR TUBE
INSULATION
CAULK
Avoid contact between tubing and structure
NOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1
″
MIN.
SUSPENSION
Fig. 3—Mounting Unit to Pad
DIMENSIONS (IN.)
UNIT BASE PAN
DIMENSIONS
TIEDOWN KNOCKOUT LOCATIONS
A
B
C
22-1/2 X 22-1/2
3-11/16
18-1/8
14-3/8
30 X 30
6-1/2
23-1/2
20
A94199
C
B
A
3
⁄
8
″
D. (9.53) TIEDOWN
KNOCKOUTS (2) PLACES
2
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