Viper Low overrun Service Manual
© 2016, Cornelius Inc
- 33 -
Publication Number: 621360241LOEWSE
Figure 29. System Screen
Security
System security is located on the System menu. It allows a supervisor or service technician to keep unauthorized
personnel from accessing the Maintenance menu. This feature is activated on the System menu. When security is
turned on, users can only access the Main and Setup menus.
Pressing the extreme Left and Right buttons (Buttons 1 and 5) on the bottom of the display simultaneously and
holding them for approximately five (5) seconds unlocks the Security menu. If security is left ON on the System
menu, when the system times out or when the user goes back to the Main menu, security is re-activated and the
Maintenance menu is not accessible. To disable security, access the System menu, highlight Security and press
the OFF button.
Pressure Sensors
Pressure sensors allow the technician to view the high and low-side pressures in the refrigeration system without
having to connect external gauges to the system. To view this information, go to the Unit Data screen shown in Fig-
ure 10 and press the UNIT button. The System screen, shown in Figure 30, is displayed.
The number and type of sensors in the unit are typically set at the factory and should not be changed. Data is only
available on the sensors installed. If a sensor that is not installed in the unit is activated, incorrect data is displayed.
It is possible to install sensors in the field, but it is not recommended because system refrigerant charge may be
lost.
The low side pressure sensor is used to monitor compressor reversal. If it is not installed on the unit, the unit may
not operate properly.
Table 32.
Display
Description
# OF BARRELS
This selection shows the number of barrels in the system and
allows the user to change the quantity.
# OF COMPRESSORS
This selection shows the number of compressors in the system.
Currently this number is fixed at one and cannot be changed.
SECURITY
This selection allows the user to turn security on or off.
CMP #X SENSORS
This selection allows the user to choose which pressure sen-
sors are read for the compressor.
Table 33.
Option
Button 2
Button 3
Button 4
Button 5
# of Barrels
-
+
# of Compressors
-
+
Security
OFF
ON
Compressor Sensors
NONE
LOW
HIGH
BOTH
SYSTEM
12:51P
MAR 04
# OF BARRELS 2
# OF COMPRESSOR 1
BACK - +
SECURITY OFF
CMP #1 SENSORS BOTH
CMP #X SENSORS LOW
