Table Of Contents - Carrier 50JZ Product Data

compact, fully self-contained, heat
pump unit that is pre-wired, pre-piped,
and pre-charged for minimum
installation expense. 50JZ units are
available in a variety of standard
capacity ranges with voltage options to
meet residential and light commercial
requirements. Units install easily on a
rooftop or at ground-level.
Durable, dependable
components
Compressors are designed for high
efficiency. Each compressor is
hermetically sealed against
contamination to help promote longer
life and dependable operation.
Vibration isolation provides quiet
operation. Compressors have internal
high-pressure and overcurrent
protection.
Convertible duct configuration
Unit is designed for easy use in either
downflow or horizontal applications.
Each unit is easily converted from
horizontal to downflow and include
horizontal duct covers.
Direct-drive multi-speed, PSC
(permanent split capacitor) blower
motor is standard on all 50JZ models.
Direct-drive, PSC condenser-fan
motors are designed to help reduce
energy consumption and provide for
cooling operation down to 40°F outdoor
temperature. Motormaster® II low
ambient kit is available as a field-
installed accessory.
Corporate thermostats designed to
work as a system with Carrier's small
packaged product.

Table of contents

Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,6
Base Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Electrical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23, 24
Typical Wiring Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-28
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30, 31
2
Refrigerant system is designed to
provide dependability. Liquid refrigerant
filter driers are used to promote clean,
unrestricted operation. Each unit leaves
the factory with a full Puron® refrigerant
charge. Refrigerant service connections
make checking operating pressures
easier.
Indoor and Outdoor coils are
computer-designed for optimum heat
transfer and cooling efficiency. The
indoor coil is fabricated from copper
tube and aluminum fins and is located
inside the unit for protection against
damage. The outdoor coil is internally
mounted on the top tier of the unit.
Copper fin coils and pre-coated fin coils
are available from the factory by special
order. These coils are recommended in
applications where aluminum fins are
likely to be damaged due to corrosion.
They are ideal for seacoast applications.
High and Low Pressure Switches give
added safety and reliability to the
compressor.
Low sound ratings ensure a quiet
indoor and outdoor environment with
sound ratings as low as 72 dB.
(See page 3.)
Easy to service cabinets provide easy
single-panel accessibility to serviceable
components during maintenance and
installation. The basepan with
integrated drain pan provides easy
ground level installation with or without
a mounting pad. Convenient handholds
are provided to manipulate the unit on
the jobsite. A nesting feature ensures a
positive basepan to roof curb seal when
the unit is roof mounted. A convenient
3/4-in. wide perimeter flange makes
frame mounting on a rooftop easy.
Louvered Grille provides hail and
vandalism protection for the coil.
Downflow operation is easily provided
in the field to allow vertical ductwork
connections. The basepan utilizes
knockout style seals on the bottom
openings to ensure a positive seal in the
horizontal airflow mode.
Cabinets are constructed of heavy-
duty, phosphated, zinc-coated
prepainted steel capable of
withstanding 500 hrs of salt spray.
Interior surfaces of the evaporator and
electric heater compartments are
insulated with cleanable semi-rigid
insulation board, which keeps the
conditioned air from being affected by
the outdoor ambient temperature and
provides improved indoor air quality.
(Conforms to American Society of
Heating, Refrigeration and Air
Conditioning Engineers No. 62P.) The
sloped drain pan minimizes standing
water in the drain, which is provided
with an external drain.
Standard metal duct covers with
insulation come with the unit and cover
the horizontal duct openings. These can
be left in place if the units are converted
to downflow.
Short-Cycling protection for the
compressor is incorporated into our
defrost control board ensuring a five
minute delay (+/-2 minutes) before
restarting compressor after shutdown
for any reason.
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