Energy Tech Laboratories DSH - Manual (Page 4)

JOHNSON CONTROLS
4
FORM 145.32-IOM1 (908)
GENERAL INFORMATION
Our units are designed to meet the ever-changing
(unique) installation requirements of today’s market. The
horizontal configuration is unitized for single package
or split installation. Low profile design allows the unit to
be installed on the floor or suspended from the ceiling.
All unit components are securely mounted inside the
heavy gauge “Galvalume” sheet metal cabinet. All units
are lined with a 1/2 in. thick – 21lb density acoustical
insulation to ensure the quietest operation. All models
are shipped with medium-efficiency 2-in. thick throw-
away filters. Multi-position filter rack is external to the
cabinet.
Unit can be turned on its side for short periods of time,
which allows passage through standard door sizes.
Removal of the cross supports on the top and sides will
convert packaged unit into a split system, allowing the
condensing section to be installed remotely from the
evaporator section.
Horizontal units 2, 3, 4 & 5 ton models have a single
refrigerant circuit configuration. All models are equipped
with an adjustable thermal expansion valve (with exter-
nal equalizer), one valve per circuit. Each refrigerant
circuit is also equipped with a liquid line filter drier, sight
glass/moisture indicator and easy access service gauge
ports. All 2-5 ton models are shipped as factory-charged
unitized packages. The 2-5 ton units include refrigerant
line shut-off valves to allow the units to be field split.
Installation time is minimized with all models. When plan-
ning an installation consider power supply, thermostat,
condensate drain line, duct run, servicing allowances,
and load points. A remote thermostat control device is
field supplied and installed to control the units operation.
Each refrigerant circuit is equipped with auto-reset high
pressure and low pressure switches. Each circuit is con-
stantly monitored by ComfortAlert module. By monitoring
and analyzing data from the Copeland Scroll compressor
and the thermostat demand, the module can accurately
detect the cause of electrical and system related failures
and protect the compressor. A flashing LED indicator
communicates the ALERT code and guides the service
technician more quickly and accurately to the root cause
of a problem. Control circuit is 24-volt operation with
oversized transformer. Optional anti-short circuit timers
can be field/factory installed.
Service access doors are equipped with handles and
are located on all sides of the unit to allow easy servic-
ing of all components. Service access doors are factory
shipped with knock-outs allowing gauge lines to be
installed and pressure readings to be taken while the
machine is operating. In addition there is a removable
panel on the access door so visual observation of the
sight glass is possible without removing the access door.
All units are equipped with centrifugal blowers combined
with variable pitch adjustable pulleys. Forward curved
double width and inlet centrifugal blowers are used for
condenser & evaporator air movement. All models em-
ploy a draw-through air flow system. All blower wheels
are galvanized steel, with solid steel shafts and are
equipped with permanently lubricated ball bearings. V-
belt driven blowers are used in all models; RPM can be
adjusted through the variable pitch motor sheave.
ONLY QUALIFIED PERSONNEL SHOULD
PERFORM INSTALLATION AND SER-
VICE OF THIS EQUIPMENT.
High efficiency scroll compressors are used in all mod-
els, mounted on durable rubber isolator pads reducing
vibration and noise while operating. Large evaporator
and condenser coil face areas reduce noise levels, air
pressure drops and minimize potential for condensate
blow off. All models are equipped with copper tube and
rippled aluminum plate fin coils.
Units will operate reliably at an outdoor ambient down
to 60 deg F.