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7.6.1 BASIC USER INTERFACE
The Microprocessor Control display provides the user with
the operating parameters and their corresponding values.
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
Button not used on high pressure dryers.
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.
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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.
7.6.2 DISPLAY PARAMETERS
The Microprocessor Control is capable of displaying a
number of system parameters. For NVC dryers, Module #1
is supplied with a Deluxe Microprocessor Controller. The
remaining modules feature a Microprocessor Controller. The
following summarizes the parameters that can be accessed
by the user from the Microprocessor Controller:
Chiller Temperature (CHLLR TEMP): For Nirvana
Cycling Dryers, the Chiller Temperature is the
temperature, in degrees Fahrenheit, of the thermal
mass fluid.
Compressor Status (CMPRSSR): Displays whether the
refrigeration compressor is “ON” or “OFF”.
Discharge Pressure (P disch): Displays the discharge
pressure of the refrigeration system.
Suction Temperature (T suction): Displays the suction
temperature, in deg. F, of the refrigeration system.
This value is useful in determining superheat of the
refrigerant.
Suction Pressure (P suction): Displays the suction
pressure, in psig, of the refrigeration system.
Percent Savings (% SVGS): Displays the length of time
the compressor has been operating versus the length
of time the dryer has been on.
Cumulative Dryer Hours (CUM DRYER HR): Displays
the length of time, in hours, that the dryer has been
operational.
Cumulative Compressor Operating Hours (CUM CMP
HR): Displays the length of time, in hours, that the
refrigeration compressor has been energized.
Depressing the SELECT DISPLAY button repeatedly scrolls
through the above non-adjustable displays. The Customer
Set Points appear at the end of the list and may be adjusted
by the end user to match seasonal refrigeration and drain
operation. These settings are as follows:
Chiller Temperature (CHLLR TEMP)
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7.0 PRINCIPLES OF OPERATION
120.26A D4290NCHPW400F Installation Operation and Maintenance Manual
