4-50
Alarm Codes, Descriptions and Corrective Actions
µ
P-D Controller
CRR-20 & CRR-40, September 1999
Code
Description
Corrective Action
37
Low Refrigerant Level (Option)
• Check the refrigerant charge and correct as
(Shutdown Alarm)
required.
• Conditions indicate the refrigerant charge
may be low.
NOTE: This function is not used on CRR 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.
41
Spare Sensor 5 Failure (Option)
• Check the sensor by selecting it using the View
(Check Alarm)
menu. If the display shows [- - - -], the sensor is
defective or the circuit is open or shorted. Be sure
• Indicates a problem exists with this sensor
the sensor is securely attached to the connector
or its wiring. The sensor is reading out-of-
inside the unit.
range; or appears to be open or shorted.
• Check the sensor by substitution. Be sure the
• This sensor does NOT require ice bath
sensor polarity is correct.
calibration.
• Continuity check circuit wiring using a high quality
multimeter. Be sure to maintain the correct polarity
or the sensor will not work.
NOTE: Do NOT use a test light or other instru-
ment; or controller damage may result.
42
Customer Configuration Alarm
• Set the customer (and/or unit) configuration number
(Check Alarm)
to the setting required.
• Indicates customer configuration has not been
NOTE: The unit will operate and control temp-
set. This alarm does not clear unless the
erature if the controller remains programmed
Customer Configuration “CFG C” is set to a
to unit configuration “5000” and customer
valid number (other than “0”).
configuration “0”. However, the unit will NOT
operate customer specific options. See the
controller identification decal for the correct unit
configuration and customer configuration set-
tings.
Summary of Contents for CRR-20
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