4-50
Alarm Codes, Descriptions and Corrective Actions
µ
P-D Controller
CSR-20 & CSR-40, September 1999
Code
Description
Corrective Action
14
Defrost Terminated by TIme Limit
• Check electric heater rod operation using the
(Check Alarm)
“AMPS HEATR” test in the Electrical Test submenu.
• Indicates the controller terminated a defrost
• Check for correct evaporator fan operation using
cycle due to time.
the “REFRG DFRST” test in the Refrigeration Test
submenu.
• Check evaporator coil sensor for correct operation.
16
Digital Input Failure
• Check for other alarms, particularly sensor alarm
(Shutdown Alarm)
codes.
• Indicates one or more digital inputs (sensor,
• Check controller using the Microprocessor Tester.
current transformer, pressure switch, etc.)
is erratic or has failed.
25
Return and Supply Sensor Failure
• Check to be sure the sensor lead connector is
(Shutdown Alarm — setpoint at -9.9 C [14.1 F]
securely attached to the controller and the sensor
or above)
harness is securely attached to the control box.
(Check Alarm — setpoint at -10 C [14 F] or
below)
• Check for other sensor alarm codes, particularly
codes 03 and 07.
• Indicates both the return and supply sensors
have failed.
• Continuity check the wiring to the temperature sen-
sors using a wiring diagram and digital multimeter.
• Sensor Check test detected an out-of-range
condition.
37
Low Refrigerant Level (Option)
• Does not apply.
(Shutdown Alarm)
• This function is not used on CSR hermetic units.
38
Real Time Clock Battery Failure
• Replace the battery. The battery is located behind a
(Check Alarm)
small access panel on the back of the controller.
Check and reset the date/time settings as required.
• Indicates the clock battery is under voltage or
dead.
NOTE: If the battery is changed with unit On/Off
switch ON, the clock functions may not be lost.
NOTE: The data logger may lose its time
Otherwise, up to 12 hours of datalogger and
setting when unit switch is turned OFF.
hourmeter logs may be lost.
