Engineers' Specification Guide - Carrier 50ZPA Product Data

Engineers' specification guide
GENERAL: Furnish and install outdoor package, electrically
controlled, air conditioner utilizing a reciprocating compressor
for cooling duty. Unit shall discharge supply air horizontally or
vertically as shown on contract drawings.
Nominal unit electrical characteristics shall be ______ v,
______ ph, 60 Hz. The unit shall be capable of satisfactory
operation within voltage limits of ______ v to ______ v. Unit
power wiring shall enter unit cabinet at a single location.
Separate power supply shall not be required for electric heat.
COOLING CAPACITY: Total cooling capacity of the unit
shall be _____ Btuh or greater, and sensible capacity shall be
______ Btuh or greater at conditions of ______ cfm indoor air
entering unit at ______F dry bulb, _____ F wet bulb and
outdoor entering air of ______F dry bulb. Total design
conditions shall be a minimum of ______ Btuh/Watt. The unit
shall be capable of cooling operation down to 40 F as shipped
from the factory.
CABINET: Unit cabinet shall be constructed of phosphated,
bonderized, zinc-coated, prepainted steel. Basepan shall be
made of a single-piece non-corrosive, composite material.
Evaporator-fan compartment interior cabinet surfaces shall be
insulated with a minimum 1/2-in. thick, flexible fiberglass
insulation, coated on the air side with aluminum foil.
Cabinet panels shall be easily removable for servicing.
Outdoor coil shall be protected by metal louvered panels.
COMPRESSOR: Compressor shall be fully hermetic type
with internal and external vibration isolation.
CONDENSER SECTION: Condenser fan shall be of the
direct-driven propeller type with aluminum blades, riveted to
corrosion-resistant steel spiders, and shall be dynamically
balanced and discharge air horizontally or vertically upwards.
Condenser coils shall have aluminum-plate fins mechanically
bonded to seamless copper tubes with all joints brazed.
Tube sheet openings shall be belled to prevent tube wear.
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EVAPORATOR SECTION: Fan shall be 2- or 3-speed with
direct drive motor as shown on the equipment drawings.
Fan wheel shall be made from steel, be double-inlet type with
forward-curved blades with a corrosion-resistant finish and
dynamically balanced.
Evaporator coils shall have aluminum-plate fins mechanically
bonded to seamless copper tubes with all joints brazed.
Tube sheet openings shall be belled to prevent tube wear.
MOTORS: Compressor motors shall be of the refrigerant-
cooled type with line break thermal and current overload
protection.
All fan motors shall have permanently lubricated bearings, and
inherent automatic reset thermal overload protection.
Condenser fan motor shall be open drip-proof.
REFRIGERANT SYSTEM: Refrigerant system shall include
fixed orifice metering system.
CONTROLS: Unit shall be complete with self-contained low-
voltage control circuit.
APPROVALS: Unit shall be UL listed as a total package for
safety requirements. All wiring shall be in accordance with
NEC.
Unit shall be rated in accordance with ARI Standards 210/240-
89 and 270-84.
Cabinet insulation shall conform to ASHRAE No. 62P.
Insulation and adhesive shall meet NFPA 90A requirements for
flame spread and smoke generation.
Unit shall have a sloped drain pan that conforms to ASHRAE
Standard 62-89.
ACCESSORIES: Field-installed accessories shall include
solid-state compressor short-cycle device, outdoor thermostat,
thermostat and subbase, electric heaters with single-point
connection, crankcase heater (230-1-60), low- and high-
pressure switch kits, and low-ambient kit.