Liebert 3000 manual 2.8.2Non-VolatileMemory, 2.8.3DIP Switches, 2.8.4Control Outputs

Operation with Advanced Microprocessor Controls

2.8.2Non-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.

2.8.3DIP 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).

2.8.4Control 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 fol- lowing table.

Table 6 Control output LEDs

LED	Control Output
R5	Heat Rejection
LLSV	Liquid Line Solenoid Valve
HGBP	Hot Gas By-Pass or Compressor Unloader Valve
C1	Compressor
RH1	Reheat Stage 1, Hot Gas, Hot Water Reheat Solenoid or SCR Reheats
RH2	Reheat Stage 2
HUM	Humidifier
FAN	Main Fan
HMV	Humidifier Make-Up Valve
LLSV2	Part Coil Solenoid Valve

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