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7.6.3 DRYER SET POINTS AND ALARMS
The Microprocessor Control has several user adjustable set
points that are displayed at the end of the display parameter
list. These set points allow the user to configure the dryer
to operate according to site conditions. The controller is
shipped from the factory with each parameter having its
own default value. The following chart summarizes the
parameters that may be adjusted by the user:
SETPOINT Display
Description
Parameter
Range
Factory
Setpoint
Nirvana
Cycling
Chiller Off
Temperature CHLLR TEMP
32°F - 50°F; 1
°F increments
34°F
7.6.4 ADJUSTING SET POINTS
Accessing and manipulating each of the set points in
the CUSTOMER MODE is accomplished as follows. The
parameter is selected using the SELECT DISPLAY button.
After scrolling through the displays, the “Cust Set Points”
screen is displayed. The parameters after this screen may
be adjusted by the user. Once the desired parameter is
displayed, depressing the “+/-” button changes the set
point. Once the new set point is displayed, depressing
ENTER saves the set point. Exiting the Customer Set Point
routine is accomplished by depressing the SELECT DISPLAY
button until the END CUST SET PTS screen is displayed.
The following example illustrate the keystrokes required to
change the Chiller Temperature Set Point from 36 F to 38 F.
SELECT
DISPLAY
CHLLR TEMP: 36
Pressing SELECT DISPLAY will increment the display through
the available display parameters.
SELECT
DISPLAY
Cust Set Points
Continue pressing SELECT DISPLAY until the Customer Set
point screen is displayed. The parameters that follow are the
User Adjustable Parameters for the controller.
SELECT
DISPLAY
CHLLR TEMP: 36
Press SELECT DISPLAY until “CHLLR TEMP” is displayed.
CHLLR TEMP:38
+
-
Depress “ + / -“ as required to change the CHLLR TEMP to 38
degrees.
ENTER
CHLLR TEMP:38
Pressing “ENTER” saves the set point.
SELECT
DISPLAY
End Cust Set Pts
Press SELECT DISPLAY as necessary to display the End
Customer Set points Screen.
SELECT
DISPLAY
CHLLR TEMP: 36
Press SELECT DISPLAY as necessary to return the
Microprocessor Control to the desired display parameter.
7.6.5 ALARMS AND THEIR FUNCTIONS
There are several alarms detected by the Microprocessor
Control to alert the user of an out of tolerance condition.
Once each alarm is detected, a description of the alarm will
appear in the screen and the remote alarm contact will close.
Note that during the alarm condition, the SELECT DISPLAY
button may be depressed to scroll through the available
parameters. After approximately 30 seconds, the alarm
screen will reappear, provided the alarm condition persists.
Alarm
Display
Alarm Set
Point
HIGH PRESSURE
CUTOUT
HI PRESS CO
See Table 1
LOW PRESSURE
CUTOUT
LO PRESS CO
See Table 1
HIGH TEMPERATURE
ALARM
HITEMP ALRM 55 °F
LOW TEMPERATURE
ALARM
LOTEMP ALRM 30 °F
The alarm names and a brief description of each are
described in detail below.
HIGH TEMPERATURE ALARM (HITEMP ALARM)
When the thermal mass (glycol) temperature in a Nirvana™
Cycling dryer reaches the factory alarm set point, after an
alarm delay, the alarm will be activated. This alarm condition
may not necessarily damage the dryer when subjected to
long-term exposure. It may, however, have a significant
impact on downstream processes and thus should be
investigated upon detection. Note that this alarm will not
shut down the dryer. This alarm will activate the remote
alarm contact and reset automatically once the alarm
condition is rectified.
7.0 PRINCIPLES OF OPERATION
120.26A D4290NCHPW400F Installation Operation and Maintenance Manual
