10
Nirvana Cycling Refrigerated Dryer Models 3250-8000
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The microprocessor controller 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.
Multiple module dryers come standard with individual glycol circulating
pumps on each module. This design permits inherent redundancy, as
the loss of a single pump will not degrade the performance of the dryer.
Ingersoll Rand recommends servicing the dryer at the first available
opportunity should a modules pump require servicing.
ADJUSTMENT
SCREW
FIGURE 2
WATER REGULATING VALVE
A
NOTICE
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.
A
NOTICE
Verify that there is an adequate volume of water for dryer demand.
7.0 PRINCIPLES OF OPERATION
7.6.1
BASIC USER INTERFACE
The Microprocessor Control display provides the user with the
operating parameters and their corresponding values. When
power is supplied to the dryer, the Microprocessor Control will
illuminate and default to the “Standby” mode, displaying the
“Press ON” prompt.
The following illustration summarizes the keypad functions.
CHLLR TEMP: 37
BUTTONS
• ON
Places the dryer "On Line"; Energizes glycol pump on Nirvana™ Cycling
dryers. For Nirvana™ Cycling models, the compressor will operate based on
temperature;
• OFF
Places the dryer "Off Line"; Stops all automatic functions, including circulating
pump operation on Nirvana™ Cycling dryers.
• SELECT DISPLAY
Allows the user to cycle through the available displays. The last display
selected will remain displayed as the default display.
• + / -
Allows user to modify set point values. Set point values cycle through a fixed
range. Also allows entering negative numbers in FACTORY MODE.
• TEST
Allows user to manually activate the drain no-loss drain valve.
• RESET
Pressing once clears the local alarm indication and de-energizes the remote
alarm contact. Should the alarm condition persist, the alarm will return after
the alarm inhibit time has expired.
• SET
Permits the adjustment of parameters in TECHNICIAN and FACTORY
MODES. In CUSTOMER MODE, allows user to back through displays,
• ENTER
Used to accept changed parameters and set point values.
• i
Restricted Level access for factory use only. Not used for basic dryer
functions. Not to be used by customer or service technician.
Summary of Contents for Nirvana 3250-8000
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