Viper Service Manual

Table 33

Option

Button 2

Button 3

Button 4

Button 5

 

 

 

 

 

 

 

 

 

 

Compressor Sensors

NONE

LOW

HIGH

BOTH

 

 

 

 

 

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.

 

SYSTEM

# OF BARRELS

2

 

 

# OF COMPRESSOR 1

 

 

SECURITY

OFF

 

12:51P

CMP #1 SENSORS BOTH

 

 

 

 

MAR 04

 

 

 

 

 

 

 

 

 

 

 

BACK NONE LOW HIGH

BOTH

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.

© 2010, IMI Cornelius Inc.

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Publication Number: 621360041TBSER

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Cornelius 3 service manual Security, Pressure Sensors, None LOW High Both

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