11
Nirvana Cycling Refrigerated Dryer Models 3250-8000
ingersollrandproducts.com
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.
• Inlet Air Pressure and Temperature (P AIR IN / T AIR IN):
Displays the temperature, in °F and pressure, in psig, of the
inlet compressed air.
• Outlet Air Pressure and Temperature (P AIR OUT / T AIR
OUT): Displays the temperature, in °F and pressure, in psig,
of the outlet compressed air.
• Drain Interval (DRN INT): Displays the length of time, in
minutes, between operation of the no-loss drain valve.
• Drain On (DRN ON): Displays the length of time, in seconds,
that the no-loss drain valve is open.
• 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)
7.0 PRINCIPLES OF OPERATION
7.6.3
DRYER SET POINTS AND ALARMS
The Microprocessor Controller permits adjustment of each
module’s Chiller Temperature set point. This adjustment
allows the user to configure the dryer to operate according to
site conditions or to equalize run time of the compressors. The
controller is shipped from the factory with the Chiller
Temperature of each module preset as follows:
Press SELECT DISPLAY as necessary to display the End
Customer Set points Screen.
End Cust Set Pts
SELECT
DISPLAY
SELECT
DISPLAY
Press SELECT DISPLAY until the Customer Set point screen is
displayed. The parameters that follow are the User Adjustable
Parameters for the controller.
Cust Set Points
ENTER
Pressing “ENTER“ saves the set point.
CHLLR TEMP: 36
SELECT
DISPLAY
Pressing SELECT DISPLAY until the CHLLR TEMP parameter is
displayed.
CHLLR TEMP: 34
Depress “ + / -“ as required to change the Chiller Temperature to
36 °.F.
CHLLR TEMP: 36
+
-
Press SELECT DISPLAY as necessary to return the
Microprocessor Control to the desired display parameter.
This display shows the actual chiller temperature.
SELECT
DISPLAY
CHLLR TEMP: 39
NVC4000
34
35
NVC4800
34
35
NVC6000
34
35
36
NVC7200
34
35
36
NVC8000
33
34
35
36
NVC9600
33
34
35
36
NVC12000
34
35
36
34
35
NVC14400
34
35
36
34
35
36
NVC16800
33
34
35
36
33
34
35
NVC19200
33
34
35
36
33
34
35
36
Module
#1
Module
#2
Module
#3
Module
#4
Module
#5
Module
#6
Module
#7
Module
#8
To equalize the runtime of the compressors, the user may
“shift” the setpoints above to other modules. For example, on
a NVC6000, Module #2 can be set to 34°F, Module #3 to 35°F
and Module #1 to 36°F. Additionally, to address seasonal
drying needs, the user may adjust the Chiller Temperatures in
a range of up to 43°F - 47°F max, with the modules adjusted
in 1°F increments as shown above.
7.6.4
ADJUSTING CHILLER TEMPERATURE SET POINTS
Accessing the Chiller Temperature parameter in the
CUSTOMER MODE is accomplished by entering the
Customer Set Point routine as described below. Once the
user changes the CHLLR TEMP parameter to a new value,
the value is confirmed and the user exits the Customer Set
Point routine. The following example illustrates the keystrokes
required to change the Chiller Temperature from the default
value of 34°F to 36°F:
