Johnson Controls Unitary Products NL024 Technical Manual page 5

3. Unit shall have a rigidly mounted condenser coil guard to
provide protection from objects and personnel after
installation.
4. Indoor blower section shall be insulated with up to 3/4"
thick insulation.
5. Cabinet panels shall be "large" size, easily removable for
servicing and maintenance.
6. Unit shall be built on a formed, "Super-Structure" design
base pan, with embossments at critical points to add
strength, rigidity and aid in minimizing sound.
7. Full perimeter base rails shall be provided to assure
reliable transit of equipment.
8. Condensate pan shall be internally sloped and conform to
ASHARE 62-89 self-draining standards, with 3/4" NPTF
ridged mount connection.
INDOOR (EVAPORATOR) FAN ASSEMBLY
1. Fan shall be direct drive, either 3 speed PSC (Permanent
Split Capacitor) or 5 speed constant torque (X Motor)
design.
2. 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.
3. Bearings shall be sealed and permanently lubricated for
longer life and no maintenance.
4. Fan assembly shall be accessible via removable inlet ring.
OUTDOOR (CONDENSER) FAN ASSEMBLY
1. The outdoor fan shall be of the direct-driven propeller type,
discharge air vertically, have aluminum blades riveted to
corrosion resistant steel spider bracket and shall be
statically balanced for smooth operation.
2. The outdoor fan motor shall be totally enclosed with
permanently lubricated bearings and internally protected
against overload conditions.
REFRIGERANT COMPONENTS
Compressors:
a. Shall be fully hermetic reciprocating, rotary or scroll type,
direct drive, internally protected with internal high-
pressure relief and over temperature protection. The
hermetic motor shall be suction gas cooled and have a
voltage range of + or - 10% of the unit nameplate
voltage.
b. Shall have internal isolation and sound muffling to
minimize vibration and noise, and be externally isolated
on a dedicated, independent mounting.
Coils:
Johnson Controls Unitary Products
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, blow
through design.
c. Condenser coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced
copper tubes with all joints brazed or Micro-Channel
aluminum tube, aluminum fins.
d. Condenser coil shall be draw through design.
Refrigerant Circuit and Refrigerant Safety Components shall
include:
a. Independent fixed-orifice or TXV expansion devices.
b. Filter/strainer to eliminate any foreign matter.
c. Accessible service gage connections on both suction
and discharge lines to charge, evacuate, and measure
refrigerant pressure during any necessary servicing or
troubleshooting, without losing charge and without
disrupting condenser or evaporator air flow.
Unit Controls:
a. Controls shall be mounted in a large control box, allowing
easy access for trouble shooting and maintenance
without affecting the normal system operation pressures.
b. Unit shall have large, easily removable panels, covering
electrical controls and compressor, allowing easy access
for any necessary maintenance or servicing.
ELECTRIC HEATING SECTION
1. An electric heating section, with nickel chromium elements,
shall be provided in a range of 5 thru 15 KW, single phase
only.
2. The heating section shall have a primary limit control(s)
and automatic reset, to prevent the heating element
system from operating at an excessive temperature.
3. The heating section assembly shall slide out of the unit for
easy maintenance and service.
UNIT OPERATING CHARACTERISITCS
1. Unit shall be capable of starting and running at 125° F
outdoor temperature, exceeding maximum load criteria of
ARI Standard 210/240.
2. The compressor, with standard controls, shall be capable
of cooling operation down to 45° F outdoor temperature.
ELECTRICAL REQUIREMENTS
All unit power wiring shall enter unit cabinet at a single factory
provided location.
Separate openings shall be provided for the control wiring.
546040-BTG-E-0711
5