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can be no deviation. Consult the Application Guideline and
Service Manual—Air Conditioners and Heat Pumps Using Pu-
ron® Refrigerant to obtain required unit changes for specific
applications and for R-22 retrofit.
I. CHECK EQUIPMENT AND JOB SITE
A. UNPACK UNIT
Move to final location. Remove carton taking care not to damage
unit.
B. 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.
II. 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—Air Conditioner with Puron® Refrigerant for wind
baffle construction.
NOTE: Unit must be level to within ± 2° (± 3/8 in./ft) per
compressor manufacturer specifications.
III. 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.
On rooftop applications, locate unit at least 6 in. above roof
surface.
IV. 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.
V. CHECK INDOOR CHECK-FLO-RATER® PISTON AND
INSTALL PISTON RING (552A/550A 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 neoprene 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.
VI. INSTALL TXV (556A STANDARD; 552A/550A OP-
TIONAL)
NOTE: ALL 556A UNITS MUST BE INSTALLED WITH A
TXV—NO EXCEPTIONS!
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®.
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 or with the
accessory piston body kit and piston shipped with outdoor unit.
A. TXV INSTALLATION
IMPORTANT: The TXV should be mounted as close to the
indoor coil as possible and in a vertical, upright position. Avoid
mounting the inlet tube vertically down. Valve is more susceptible
to malfunction due to debris if inlet tube is facing down. A
factory-approved filter drier must be installed in the liquid line.
Fig. 2—Connecting Tubing Installation
A94028
INSULATION
VAPOR TUBE
LIQUID TUBE
OUTDOOR WALL INDOOR WALL
LIQUID TUBE
VAPOR TUBE
INSULATION
CAULK
Avoid contact between tubing and structureNOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1″ MIN.
SUSPENSION
Fig. 3—Clearance Requirements
DIMENSIONS (IN.)
UNIT SIZE
MINIMUM
MOUNTING PAD
DIMENSIONS
TIEDOWN KNOCKOUT
LOCATIONS
AB
018 20 X 32 2-13/16 6-15/16
024–060 26 X 32 5-1/16 9-11/16
A97375
B
A
L
C
8
3
⁄16″
3
⁄8 IN. DIA TIEDOWN
KNOCKOUTS
(2) PLACES
IN BASEPAN
—2—
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