Ingersoll Rand NIRVANA 2000 Manuel De L'opérateur page 7

evaporator. The refrigerant pressure is reduced upon entering the
evaporator where as it evaporates, heat is removed from the thermal
mass fluid.
7.5 THERMAL MASS CIRCULATING SYSTEM
The thermal mass fluid in a Ingersoll Rand Nirvana™ Cycling dryer is
continuously circulated in a closed pump loop system. Referring to
Figure 1 and following the dashed "
removed from the fluid in the evaporator by the refrigeration system.
The thermal mass reservoir is sized to minimize refrigeration cycles
during reduced air load periods. The thermal mass fluid is pulled from
the bottom of the reservoir and pumped through the chiller, removing
heat from the air and returned to the evaporator. The pump utilized on
Ingersoll Rand Nirvana™ Cycling dryer is a maintenance-free, quiet
cartridge circulator pump similar to those used in residential water
systems. While the refrigeration system cycles on and off based on
loading conditions, the circulating pump runs continuously to maintain
flow through the chiller at all times.
7.6 CONTROLS
Ingersoll Rand 2000-2400 Refrigerated Compressed Air Dryers are
equipped with the Microprocessor Control.
microprocessor-based controller has been engineered by Ingersoll
Rand exclusively for use with Ingersoll Rand Compressed Air Dryers.
The Microprocessor Control cycles the refrigeration system based on
the dryer's Chiller Temperature. A temperature sensor samples the
thermal mass temperature as it enters the chiller exchanger.
Chiller Temperature Set point is a user adjustable set point that is used
to set the Refrigeration Compressor Off temperature. Once the Chiller
Temperature has fallen below the Chiller Temperature Set point, the
refrigeration compressor will de-energize. The Operating Temperature
Differential is factory set at 4°F above the Chiller Temperature Set point.
Therefore, if a user adjusts the Chiller Temperature at 36°F, the
Refrigeration Compressor On temperature will be 40°F.
In addition to the operation of the Nirvana™ Cycling dryers as described
above, the Microprocessor Control permits monitoring of dryer
parameters and enunciation of alarm conditions.
The list below summarize the features the Microprocessor Control:
• 2 X 16 Character Backlit LCD Display - Easy-to-read display provides
continuous indication of dryer default parameter. Standard backlight
permits viewing of critical information in low light environments.
• Remote Start / Stop: Microprocessor Control-equipped dryers offer a
unique remote start / stop feature. This feature allows the dryer to be
operated via a remote user-supplied switch.
• Remote Alarm Contact: Microprocessor Control-equipped dryers
include a remote alarm contact to provide indication of any of the
dryers alarms described later in this manual. Contact rated for 2A /
120V max.
The Microprocessor Control features three levels of access. The default
level CUSTOMER MODE permits adjustment of dryer parameters to
address seasonal variations for drain timing and pressure dew point
temperature. A protected TECHNICIAN MODE permits access to and
manipulation of additional parameters.
FACTORY MODE is also included for use with Ingersoll Rand Service
Personnel for troubleshooting the dryer.
6
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7.0 PRINCIPLES OF OPERATION
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THERMAL MASS FLUID
This advanced
A password protected
Nirvana Cycling Refrigerated Dryer Models 2000-2400
http://air.ingersollrand.com
The Microprocessor Control includes a digital readout for monitoring the
discharge pressure of the refrigerant gas exiting the compressor. This
reading will vary dependent upon condenser type as indicated below:
• For air-cooled applications, condensing fans are cycled on and off by
the Microprocessor Control based on the refrigerant discharge pressure.
Primary fan is cycled on at 275 psig and off at 195 psig. Should the
discharge pressure continue to climb above 335 psig, the secondary
condensing fan will cycle on. As discharge pressure is reduced below
235 psig, the secondary fan will cycle off.
• Water cooled condensers utilize a water regulating valve (Note Figure
2). The water regulating valve comes pre-adjusted from the factory at
260 psig discharge pressure. To compensate for water temperature
variation, it may be necessary to adjust the water regulating valve to
maintain a 260 psig discharge pressure. Adjustment can be done by
rotating the adjusting screw counterclockwise for an increase in
discharge pressure. For conditions where low water temperature and/or
high water pressure are expected it is advisable to install a water
pressure regulator ahead of the condenser.
The
ADJUSTMENT
SCREW
FIGURE 2
WATER REGULATING VALVE