036-33072-001 Rev. A (0601)
Unitary Products Group
3
GENERAL
Our units are designed to accommodate the ever-changing
installation requirements of today's market. All models 5 -25
tons are shipped as factory-charged unitized packages.
These units are designed to allow easy passage through
doors, hallways and elevators. All models are designed for
free-standing mounting on the floor. All unit components are
securely mounted inside the heavy gauge "Galvalume" steel
cabinet. All units are lined with 1/2" thick -2 Ib density acous-
tical insulation to ensure the quietest operation. All models
are provided with medium- efficiency 2" thick throwaway fil-
ters. All models are shipped with vertical evaporator fan dis-
charge
as
standard.
The
evaporator
fan
discharge
configuration is field convertible on all units. An optional dis-
charge plenum is available for horizontal 'free-blow' applica-
tions.
The 5 ton model has a single refrigerant circuit. The 8
through 20 ton models are dual compressor units with two
independent compressor/condenser circuits. The 25 ton
model has three independent compressor/condenser circuits.
Evaporator coils are of copper tube and rippled aluminum
plate fin construction. The high-efficiency tube-in-tube con-
densers feature a convoluted inner tube design for optimum
performance. Standard models feature a copper inner tube
surrounded by a steel outer tube, and carry a 400 psig work-
ing pressure rating. Multiple refrigerant circuit models feature
internally manifolded condensers (single water in, water out
connection).
High efficiency Scroll compressors are used in all models,
mounted on durable rubber isolators to reduce vibration and
noise while operating. Each refrigerant circuit is equipped
with high pressure and low pressure switches. All models are
equipped with an adjustable thermal expansion valve (with
external equalizer), one valve per circuit. Each refrigerant cir-
cuit is also equipped with a liquid line filter drier, sight glass/
moisture indicator, and service access ports. An electrically
re-setable lock-out relay will shut off the compressor in the
event of pressure switch trip during operation. Control circuit
operates on 24V, and features an oversized transformer.
Optional anti-short circuit timers can be field/factory installed.
Installation time is minimized with all models. When planning
an installation consider power supply, thermostat, conden-
sate drain line, duct run, and service clearances. A remote
thermostat device is field supplied and installed to control the
unit operation. Attachments to the unit include the bolt-on fil-
ter frame (20 and 25 ton only), and factory supplied discharge
duct flanges.
Service access doors are equipped with lifting handles, and
are located on all sides of the unit to allow easy servicing of
all components. The compressor access door is supplied with
knock-outs allowing gauge lines to be installed and readings
to be taken with the machine in operation. In addition there
are removable viewing ports to allow observation of the sight
glass without removing the access door.
All units are equipped with centrifugal blowers combined with
variable pitch adjustable pulleys. Forward curved double
width, double inlet blowers are used for evaporator air move-
ment. All models employ a draw-through air flow arrange-
ment. Large evaporator coil face areas reduce noise levels,
air pressure drops, and minimize potential condensate blow-
off .All blower wheels are galvanized steel, with solid steel
shafts supported in permanently lubricated ball bearings. V-
belts drive all models and blower RPM can be adjusted
through the motor sheave.
ONLY QUALIFIED PERSONNEL SHOULD PER-
FORM INSTALLATION AND SERVICE OF UNITS.
CAUTION
