Product specifications

7
UNIT FEATURES: SCROLL COMPRESSORS (CONT.)
Scroll Compressors have much better liquid
refrigerant handling capability than other types of
compressors due to the nature of scroll design.
Scroll Compressor Durability and Reliability
as well as Quiet Operation is inherent with the design
of the scroll compressor. Scroll compressors have few
moving parts, oversized Teflon impregnated bearings
and a smooth gas flow compression cycle, to ensure
durability and reliability.
A Large Capacity Built-In Suction Filter is
located between the suction inlet and the motor to
prevent abrasive material such as flux, dirt, scale or metal
chips from entering the motor cavity. The abrasive action
of this foreign material would crack, chip and wear the
motor insulation which could cause premature motor
failure. These same abrasives could also cause bearing
seizures and excessive wear of all surfaces.
Compressor Motor Dependability has been
developed with heavy duty motor windings cooled by
suction refrigerant gas. Motor winding insulation
systems exceed Class B requirements and overload
protection is accomplished by solid state motor module
with winding temperature thermistor sensor input.
Compressor Lubrication is provided by an integral
centrifugal pumping system through the center of the
motor/scroll shaft.
Quiet Operation of Scroll Compressors
ensures considerably quieter unit operation, than other
types of compressors. Heavy construction, few moving
parts, small motor horsepower, and smooth gas flow
through the orbital compression cycle, ensures quiet
operation of our ACDS-B Packaged Chillers.
Vibration Free Operation is ensured by smooth
quiet compressor operation plus having the
compressors mounted with rubber grommets to the
frame.
Capacity Control Modulation is managed by the
units
Microcomputer Controller in
response to system load requirements. The system load
requirements are measured by sensing the chiller's
leaving fluid temperature and staging the compressors
accordingly. The ACDS-B chiller part load efficiency is
excellent due to the staging sequence of the
compressors to meet the required load. If the minimum
load requirement is less than the chiller's minimum
mechanical step capability, hot gas by-pass option
should be ordered with the unit. See Table 1 for unit
capacity control capabilities.
Capacity Control Modulation with Optional
Hot Gas By-Pass, operates by imposing an artificial
load on the evaporator. Discharge gas from the
compressor is introduced to the liquid-vapor mixture
of refrigerant downstream of the expansion valve. The
discharge gas is cooled by the liquid refrigerant present
in the turbulence of the evaporator so that the final
temperature of refrigerant gas leaving the evaporator
does not rise. Hot gas by-pass does not offer any energy
savings, but does allow the cooling capacity to the
equipment to vary precisely with the load requirements.