Guide specifications, Indoor Packaged Unit

Guide specifications

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.

1.02QUALITY 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.

1.03DELIVERY, 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

2.01EQUIPMENT

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.