4-6 Status Indicator LEDs and Alarm Codes µP-D Controller
CSR-20 & CSR-40, September 1999
PWRED Power Reduction Mode Setting and Enable
RCOMP Remote Cool Indicator
RDEF Remote Defrost Indicator
REFRG Refrigeration Test Submenu
RET Return Air Temperature Sensor
RETG Return Air Sensor Grade
RIR Remote In-range Indicator
RSP Remote Spare Indicator
SENSR Sensor
SETPT Setpoint Temperature
SLS Suction Line Solenoid Valve
SOT Start of Trip
SPR1 Spare Temperature Sensor 1
SPR1G Spare Sensor 1 Grade
SPR2 Spare Temperature Sensor 2
SPR2G Spare Sensor 2 Grade
SPR3 Spare Temperature Sensor 3
SPR3G Spare Sensor 3 Grade
SPR4 Spare Temperature Sensor 4
SPR4G Spare Sensor 4 Grade
SPR5 Spare Temperature Sensor 5
SPR5G Spare Sensor 5 Grade
STEST Single Pretrip Test Submenu
SUP Supply (Discharge) Air Temperature Sensor
SUPG Supply Air Sensor Grade
TD Temperature Differential
TEMP Temperature
TEST Test Menu
TIME Current Time 1
UHMT1 User Hourmeter 1 Threshold
UHMT2 User Hourmeter 2 Threshold
UHMT3 User Hourmeter 3 Threshold
UHMT4 User Hourmeter 4 Threshold
UHRM1 User Hourmeter 1 Hours
UHRM2 User Hourmeter 2 Hours
UHRM3 User Hourmeter 3 Hours
UHRM4 User Hourmeter 4 Hours
UNIT Unit
USDA USDA Logging Enable
USDA1 USDA1 Temperature Sensor 1 (USDA Enabled)
USDA2 USDA2 Temperature Sensor 2 (USDA Enabled)
USDA3 USDA3 Temperature Sensor 3 (USDA Enabled)
USN Unit Serial Number
USNXX Unit Serial Number Character 01, 02, 03 ...10
(total number of characters)
VERSN Software Version
VIEW View Menu
VOLTS Total Voltage
YEAR Current Year
Status Indicator LEDs and Alarm Codes
The indicator LEDs stay ON continuously to indicate a unit
operating mode or condition. The Alarm LED stays ON con-
tinuously when a Check Alarm occurs. The Alarm LED flash-
es ON and OFF when a Shutdown Alarm occurs. LEDs are
located on the µP-D controller and signal the following:
• Cool Mode
• Modulation Mode
• Null Mode
• Heat Mode
• In-Range (Temperature)
• Defrost Mode
• Supply (Air Temperature)
• Return (Air Temperature)
• Power Limit Mode
• Alarm
Alarm Codes
Check Alarms indicate corrective action should be taken
before a problem becomes severe. The unit continues to oper-
ate. However, some unit functions may be inhibited.
Shutdown Alarms indicate the unit operation has been
stopped to prevent damage to the unit or cargo. The problem
must be corrected and the alarm code cleared from the con-
troller display before the unit can be restarted to resume nor-
mal operation.
Alarm codes are recorded in the controller memory to
simplify unit diagnosis and troubleshooting procedures. The
first 16 fault codes including the most recent fault code are
retained by the controller in a non-volatile memory in order of
their occurrence (see codes, alarm type and alarm description
below). Alarm codes that are recorded during an automatic
Pretrip Test are recorded in the controller memory and dis-
played with a hyphen (-) preceding the alarm code. Alarm
codes 52 through 58 can only be generated during an automat-
ic Pretrip test (or Fitness test).
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