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628767-YTG-C-0910
Johnson Controls Unitary Products 5
Guide Specifications
MILLENNIUM™
Split System Air-Cooled Air Handler
Models: NC300 and ND360, 480 and 600
General
Units shall be manufactured by Johnson Controls, Unitary
Products Group in an ISO 9001 certified facility. These
factory-assembled units include a well-insulated cabinet, a
DX cooling coil with copper tubes and aluminum fins,
expansion valve(s), distributor(s), throwaway filters, a
centrifugal blower, a blower motor, an adjustable belt drive, a
blower motor contactor and a small holding charge of
nitrogen. The units are shipped in the vertical position ready
for field installation. The air handler units can be installed for
horizontal operation by reversing the position of the solid
bottom panel with the return air duct flange on the front of the
unit. The products must be tested per ARI 340/360 and
Underwriter Laboratories U.L. 1995 and carry both CSA and
ARI certification.
Description
The NC/ND indoor units are completely piped and wired at
the factory and are shipped ready for immediate installation.
Only the interconnecting liquid and suction lines, control
wiring, and the main power wiring are required to complete
the installation. Every coil is dehydrated, evacuated, leak
tested and pressure tested at 450 psig before being
pressurized with a holding charge of nitrogen for shipment
and/or storage.
To eliminate the costly cabinet deterioration problems usually
associated with outdoor equipment, all sheet metal parts are
constructed of commercial grade (G90) galvanized steel.
After fabrication, each part is thoroughly cleaned to remove
any grease or dirt from its surfaces. The parts that will be
exposed to the weather are then coated with a powder paint
to assure a quality finish for many years. This coating system
has passed the 1000-hour, salt spray test per ASTM
Standard B117.
Unit Cabinet
Cabinet shall be constructed of 18 gauge, zinc coated steel,
finished with a powder paint process capable of withstanding
a minimum of 1000 salt spray hours according to ASTM
B117. Cabinet screws shall comply with the ASTM B117 salt
spray test for a minimum of 1000 hours. Panels shall be
removable for easy access to all internal components during
maintenance and service. A filter rack shall be included to
accommodate 1" or 2" filters. Cabinet shall feature a
separate access panel for the controls so that unit airflow
need not be disturbed during servicing. The NC300, ND360-
480 units are shipped in the vertical position ready for field
installation. The blower module can be repositioned in the
field for maximum flexibility. The ND600 product ships with a
separate M1CZ600A evaporator coil and can be assembled
in the vertical or horizontal position in the field.
Each unit shall have:
a. A steel angle frame to provide the rigid support
required for shipping, rigging and years of dependable
operation.
b. Exterior panels of 18 gauge steel, finished with baked
enamel to provide a long-lasting quality appearance.
c. Removable panels to provide easy access to the
internal components for maintenance and service.
d. A filter rack with 1" or 2" filters.
Indoor (Evaporator) Fan Assembly
Fan shall be a belt drive assembly and include an adjustable
pitch motor pulley. Job site selected brake horsepower shall
not exceed the motors nameplate horsepower rating plus the
service factor. Units shall be designed to operate within the
service factor. Fan wheel shall be double-inlet type with
forward-curved blades, dynamically balanced to operate
smoothly throughout the entire range of operation. Airflow
design shall be constant air volume. Bearings shall be sealed
and permanently lubricated for longer life and no
maintenance. Blower motors and drive kits are ordered
separately. Power wiring for blower motor is field supplied.
Refrigerant Components
Coils:
a. Evaporator coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced
copper tubes with all joints brazed.
b. Evaporator coil shall be of the direct expansion, draw
through design.
Refrigerant Circuit and Refrigerant Safety Components:
a. Include factory-mounted distributors, adjustable
thermal expansion valves and solenoid valves for both
capacity reduction and refrigerant pump out on start-
up.
b. Include factory installed auxiliary side connectors for
the addition of field installed hot gas bypass.
c. Shall include filter/strainer to eliminate any foreign
matter.
Controls
Unit controls shall include 208/230/460 or 575 volt
transformer, blower motor contactor and relay, as well as a
low voltage terminal block. Unit wiring shall be color-coded
for easy service and trouble shooting.