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Viper Service Manual
© 2010, IMI Cornelius Inc. - 37 - Publication Number: 621360041TBSER
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 accessable. 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 sys-
tem. To view this information, go to the Unit Data screen shown in Figure 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 sen-
sor 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 sys-
tem 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.
Figure 30. System Screen
When the pressure sensors selection is highlighted, pressing the NONE button
removes the pressure readings from the Unit Data screen, shown in Figure 31. If
LOW is selected, only the low pressure reading is displayed. If HIGH is selected,
only the high pressure reading is displayed.
NOTE: If a pressure sensor is open, the pressure reading is 386 PSIG.
Compressor Sensors NONE LOW HIGH BOTH
Table 33
Option Button 2 Button 3 Button 4 Button 5
SYSTEM
12:51P
MAR 04
# OF BARRELS 2
# OF COMPRESSOR 1
BACK NONE LOW HIGH BOTH
SECURITY OFF
CMP #1 SENSORS BOTH