Non-Volatile Memory. Liebert 3000, Liebert Challenger 3000, CHALLENGER 3000

Operation with Advanced Microprocessor Controls

2.8.2 Non-Volatile Memory

All critical information is stored in nonvolatile memory. Setpoints, setup parameters, and component run hours are kept inside the microcontroller in EEPROM. Information retained for the alarm history is kept in non-volatile RAM.

2.8.3 DIP Switches

Equipment options are selected and enabled using DIP switches 1 through 7. These are located at the upper left of the control board and are labeled SW1. Switch 1 is at the top. These switches are factory set and should not require any user changes. The setting and function of the switches can be read from the LCD display (see Show DIP Switches on page 8 or the accompanying Table 4).

2.8.4 Control Outputs

Active control outputs are indicated with LEDs on the lower section of the control board. Each LED is lit if the control output is active (on). The LEDs assist in troubleshooting the system. Refer to the following table.

Table 6 Control output LEDs

LED

R5

LLSV

HGBP

C1

RH1

RH2

HUM

FAN

HMV

LLSV2

Control Output

Heat Rejection

Liquid Line Solenoid Valve

Hot Gas By-Pass or Compressor Unloader Valve

Compressor

Reheat Stage 1, Hot Gas, Hot Water Reheat Solenoid or SCR Reheats

Reheat Stage 2

Humidifier

Main Fan

Humidifier Make-Up Valve

Part Coil Solenoid Valve

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