![background image](http://html1.mh-extra.com/html/thermo-king/crr-20/crr-20_maintenance-manual_1104387101.webp)
CRR-20 & CRR-40, September 1999
µ
P-D Controller
Alarm Codes, Descriptions and Corrective Actions
4-47
Code
Description
Corrective Action
05
Evaporator Coil Temperature Sensor Failure
• 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.
• Indicates a problem exists with this sensor
or its wiring. The sensor is reading out-of-
• Check sensor by substitution. Be sure sensor
range; or appears to be open or shorted.
polarity is correct. Replacement sensor MUST be
calibrated or sensor grade set.
• Controller also generates alarm in a Pretrip
test if the Evaporator Coil Sensor does not
• Continuity check circuit wiring using a high quality
show a decrease in temperature with only
multimeter. Be sure to maintain the correct polarity
the compressor running.
or the sensor will not work.
• If alarm occurs during a Pretrip test, a
NOTE: Do NOT use a test light or other instru--
dash (-) precedes the alarm code.
ment; or controller damage may result.
• This sensor REQUIRES ice bath calibration or
correct sensor grade setup.
NOTE: If the Evaporator Coil Sensor fails,
the controller continues unit operation using
other sensors and internal timers.
06
Humidity Sensor Error
• 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.
• Indicates a problem exists with this sensor or
its wiring. The sensor is reading out-of-
• Check the sensor by substitution. Be sure the sen-
range; or appears to be open or shorted.
sor polarity is correct.
• Continuity check circuit wiring using a high quality
ohmmeter. Be sure to maintain the correct polarity.
NOTE: Do NOT use a test light or other instru-
ment; or controller damage may result.
Содержание CRR-20
Страница 4: ......