Bryant PURON 533A Installation And Start-Up Instructions Manual Download Page 2

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can be no deviation. Consult the Application Guideline and
Service Manual—Air Conditioners and Heat Pumps Using
Puron® Refrigerant to obtain required unit changes for specific
applications and for R-22 retrofit.

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.

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 Conditioners and Heat Pumps Using Puron® Refrig-
erant 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.

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.

CHECK INDOOR CHECK-FLO-RATER® PISTON AND

INSTALL PISTON RING (533A 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.

VI.

TXV INSTALLATION (537A/539A REQUIRED)

NOTE:

All 537A and 539A 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.

CAUTION:

Remove indoor coil piston if unit is to be

installed on system with a TXV metering device.

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 structure