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Indoor Packaged Unit
HVAC Guide Specifications — Section 15787
Size Range: 2 to 5 Tons, Nominal
Carrier Model Number: 50AH
Part 1 — General
1.01 SYSTEM DESCRIPTION
Indoor mounted, electrically controlled packaged
horizontal cooling unit utilizing a hermetic type
scroll compressor.
1.02 QUALITY ASSURANCE
A. Unit shall be certified in accordance with ARI
Standard 210.
B. Unit shall be UL listed and carry a UL label.
C. Unit shall be CSA approved (except 3 ton, 3-phase
units).
D. Unit shall be factory run-tested to ensure proper
performance prior to delivery.
1.03 DELIVERY, STORAGE, AND HANDLING
A. Unit shall be shipped completely assembled and
ready to operate.
B. Unit shall be shipped factory charged with refriger-
ant R-22.
C. Unit shall be stored and handled in accordance with
the unit manufacturer’s instructions.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory assembled horizontal, single piece, air
cooled, indoor, ceiling plenum mounted electric
cooling unit. Contained within the unit enclosure
shall be all factory wiring, piping, controls, refriger-
ant charge (R-22), and special features required
prior to start-up.
B. Unit Cabinet:
1. Constructed of galvanized steel.
2. Interior shall be insulated with
1
/
2
-in. thick neo-
prene coated fiberglass. Insulation shall be
bonded to interior surfaces by sprayed water
reduceable adhesive.
3. Equipped with 3 same side access panels and
2 bottom hanging removable doors to facilitate
ease of maintenance. Side panels allow access
to the control box, refrigeration components,
and condenser coil. Control box shall be hinged
allowing access to the compressor and pressure
switches. Bottom doors shall allow access to
and easy removal of the condenser and evapo-
rator motors and blower assemblies.
4. Equipped with two
3
/
4
-in. threaded condensate
drain connections below the evaporator coil
and one
3
/
4
-in. threaded connection for con-
denser coil wash down. Connections shall be
factory plugged for field removal.
5. Field splittable through the removal of 4 bolts
and extending refrigerant piping and wiring to
allow remote horizontal or vertical condenser
mounting.
6. Unit shall have an integral hanging bracket
requiring only 4 threaded rods (8 if unit is split)
run to the top flange of the unit for hanging,
eliminating need for external hanger brackets.
7. Contains junction box for power connection
and opening for routing of control wiring.
C. Fans:
1. Evaporator:
a. Blower shall be of the forward-curved, cen-
trifugal, direct-drive type or belt drive (4 and
5 tons only).
b. Motor shall have permanently lubricated
bearings.
c. Unit sizes 048, 060 shall be available with
an optional 1.5 hp fan motor.
2. Condenser:
a. Blower shall be of the forward-curved, cen-
trifugal, direct-driven type (024 only), or belt
drive (036,048,060).
b. Motor shall have permanently lubricated
bearings.
D. Compressor:
1. Fully hermetic scroll type.
2. Mounted on suitable spring vibration isolators.
3. Equipped with internal line break protection.
E. Coils:
Evaporator and condenser coils shall be of non-
ferrous construction with aluminum fins mechani-
cally bonded to seamless copper tubes with all joints
brazed.
F. Refrigerant Components:
Refrigerant components shall include:
1. Capillary tube feed system.
2. Refrigerant filter-drier.
G. Filter Section:
Filter section shall consist of factory-installed, per-
manent, cleanable air filter, removable from the
same side as the access panels without the use of
tools.
H. Controls and Safeties:
Control system shall include a high-pressure switch,
a low-pressure switch, and a compressor lockout
feature which upon tripping of any safety device
shall prevent compressor from restarting until reset
at the thermostat (on all 3-phase units and 036
single-phase units only).
Time Guard® II device (single-phase only) shall pre-
vent the compressor from restarting for a minimum
of 5 minutes after shutdown.
Guide specifications