AEC NEC Central Station Air and Water Cooled Chiller - Manual (Page 9)

Page 8 NEC Series Water- and Air-Cooled Central Chillers
NECR-2 and NECR-3 chillers with an A suffix are supplied with alternate remote air-cooled
condenser selections. See Figure 7 – Remote Air-Cooled Condenser Dimensions on Page 14 for
more information.
1-4 Available Options
NEC chillers are available with options to tailor the unit to your requirements. Some are factory
installed and some can be retro-fitted in the field. Consult your sales representative for more
information.
Operating Voltages
NEC chillers are available configured for 208/230-3-60, 380/415-3-50, 460-3-60,
515-3-50, and 575-3-60 volts.
Cooling Ranges
NEC chillers are offered in two cooling ranges. Standard chillers using R-22 refrigerant are used
with 30°F (-1ºC) to 65°F (18ºC) leaving water temperature processes. Low-temperature R-22
units are available for use with leaving water temperatures below 30ºF (-1ºC). Please note that
the temperature scales on the control panel exceed these ranges, but optimum operation is
achieved within the stated ranges.
Special Manifolds
Chilled water and condenser water supply and return manifolds are available in both steel and
plastic pipe.
Hot Gas Bypass
A hot gas bypass system is offered for processes with low cooling loads.
Lead-Lag Control
Lead-lag controls, available on NEC-2 and NEC-3 chillers, allow the operator to distribute
service time between compressors.
Gauge Option
Factory-installed thermometers and pressure gauges on the evaporator inlet(s) and outlet(s)
facilitate flow balancing.
Low Voltage Monitor
An auto-reset low voltage monitor protects the compressor and control circuit from potentially
damaging brownout conditions.