Product Data

Features/Benefits (cont)
The benefits are many
• fully assembled units
• capacities to 40 tons
• system design flexibility
• commercial and industrial
application
• for use with most refrigerants
• special-order combinations available
on request
Accurate system design
Broad range of sizes allows selection
of evaporator coil or chiller to
form a well-balanced system. Capacity
will closely match the system load requirements,
and provide efficient,
energy-saving, economical operation
at maximum load conditions.
A unit for all load conditions is
offered, from refrigeration to air
conditioning duty. Units have shelland-tube
condensers. All are compactly
designed to take minimum floor
space. The 07 Series units are built
and tested to comply with ASME
(American Society of Mechanical
Engineers) Code for unfired pressure
vessels, and ANSI/ASHRAE 15
(American National Standards
Institute/American Society of Heating,
Refrigeration and Air Conditioning
Engineers) latest revision safety
standard.
2
Economical operation
Capacity control valves are provided
in all 07 Series units, except
07DA203 models, giving a built-in
system for conserving power and water
and assuring accurate control. When
only partial load operation is needed,
capacity control valves automatically
step down compressor capacity. Refrigeration
output can be reduced to
about one third of full load in direct response
to suction pressure changes.
When system load is reduced, power
and water usage are also reduced. Suction
cutoff unloading further reduces
energy usage during unloaded operation.
Valve body shuts off passage from
suction manifold, preventing charge
from unnecessarily being pulled into
the cylinder. This results in an EER
(Energy Efficiency Ratio) improvement
of as much as 39.5% at 33% load.
Built-in reliability
Condenser includes a pressure relief
device which protects the system
against overpressure.
Compressor has motor overtemperature
protection. On 07E models,
manually reset 3-phase circuit breakers
protect against power irregularities.
High- and low-pressure switches are
standard. Oil-pressure switch is
standard on 07D and 07E models. An
automatically reversible oil pump with
automatic pressure regulator keeps
07D CONDENSING UNIT 07E CONDENSING UNIT
bearings properly lubricated. Crankcase
heater keeps oil warm and prevents
dilution of oil by refrigerant
during shutdown. Time Guard circuit
prevents short cycling by compressor.
After shutdown, the timing device
delays compressor start-up for approximately
5 minutes. This reduces wear
and extends compressor life. Compressor
motor is sealed against dirt and
moisture and is cooled by suction gas.
It eliminates drive shaft alignment and
shaft seal problems.
Noise and vibration control
Muffler in discharge line minimizes
sound level.
Compressor is mounted on spring
isolators to minimize transfer of
vibration from compressor to base
structure.
Low-cost maintenance
Condenser heads are removable for
tube maintenance or replacement. An
oil level sight glass allows easy inspection
of compressor oil level. Liquid line
shut-off valve allows evaporator or
chiller to be serviced without loss of
refrigerant. The condenser serves as a
reservoir for holding liquid refrigerant
when the system is not in operation,
keeping downtime to a minimum since
refrigerant need not be replaced for
start-up.