No Air Loss Drain (Optional); Refrigeration System; Thermal Mass Circulating; Controls - Ingersoll Rand Nirvana NVC2000 A400 Manual Del Operador

7.3.2

NO AIR LOSS DRAIN (OPTIONAL)

The condensate drain operates as a zero-air-loss drain,
returning air that is displaced in the drain bowl back into the
compressed air system.
condensate from compressed air equipment is essential for
proper equipment operation and performance.
The condensate drain uses a unique sensing method to
determine the level of condensate in the drain bowl.
transducer located in the drain bowl continuously sends out a
signal 50 times per second. Once the transducer determines
that the level of condensate has reached a predetermined
level within the drain bowl, a signal is sent to the no-loss drain
valve to open. This operation permits removal of condensate
of up to 80 gallons per hour.
The drain also features a test button that permits manual
operation of the no-loss drain valve. Depressing the test
button illuminates the LED and energizes the solenoid valve.
The LED illuminates to indicate "POWER ON" and goes off
when the no-loss drain valve is operated by the transducer or
manual test button.
The condensate flows through the feed line into the drain unit
and accumulates in the container. A capacitive sensor
continuously registers the liquid level and passes a signal to
the electronic control as soon as the container is filled. The
pilot valve is then activated and the diaphragm opens the
outlet line for discharging the condensate. When the drain unit
has been emptied, the outlet line is closed again quickly and
tightly without wasting compressed air.

7.4 REFRIGERATION SYSTEM

The Refrigeration System consists of all the components which handle
R-404A. This is a hermetically sealed closed-loop system. Referring to
Figure 1 and following the phantom "REFRIGERANT" line, refrigerant is
shown leaving the evaporator section where, in the process of removing
heat, it is changed from a low pressure liquid into a low pressure gas.
This gas enters the suction side of the compressor where it is
compressed into a high pressure gas. The high pressure gas is cooled
in the air cooled or water cooled condenser section until it becomes a
high pressure liquid. It then goes through a permanent filter dryer that
ensures the refrigeration system is free of contaminants. A thermostatic
expansion valve meters the refrigerant for introduction into the
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.
6
7.0 PRINCIPLES OF OPERATION
Consistent discharging
" line, the heat is
THERMAL MASS FLUID
This advanced
Nirvana Cycling Refrigerated Dryer Models 2000-2400
ingersollrandproducts.com
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.
of 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.
A 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.
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.
ADJUSTMENT
SCREW
FIGURE 2
WATER REGULATING VALVE
The
A password protected