Carrier Transicold 69NT40-561-001 Operation And Service Manual page 80

Alarm Code Cause
AL70 Secondary Supply
Secondary Sup- Sensor (SRS) is out of
ply Sensor range.
(SRS)
AL71 Secondary Return
Secondary Sensor (RRS) is out of
Return Sensor range.
(RRS)
AL72
After the unit goes in-
Control Temp range for 30 minutes
Out of Range then out of range for a
continuous 120 min-
utes.
If the controller is configured for four probes without a DataCORDER, the DataCORDER alarms
AL70 and AL71 will be processed as Controller alarms AL70 and AL71. See
T-340
Table 4–6 Controller Alarm Indications
Components
Secondary Sup-
ply Sensor (SRS)
Secondary Return
Sensor (RRS)
Refrigeration
System
NOTE
4–44
Troubleshooting
Perform Pre-trip P5:
Perform Pre-trip P5:
Ensure unit is operating
correctly.
Corrective Actions
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de-
termined by P5, refer to
TEMPERATURE SEN-
Section
SOR Service
7.24.
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de-
termined by P5, refer to
TEMPERATURE SEN-
SOR Service Section
7.24.
Power cycle unit.
Control Temperature is
in In-range.
Any Pre-trip mode, re-
sets the timers.
Table 4–10.