Liebert CHALLENGER 3000 - Manual (Page 22)

Operation with Advanced Microprocessor Controls
14
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 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