Carrier 69NT40-511-310 Operation & Service Manual page 48

AL64 Discharge Tempera-
ture Over Limit
AL65 Discharge Pressure
Transducer Failure
AL66 Suction Pressure
Transducer Failure
AL67 Humidity Sensor
Failure
AL68 Condenser Pressure
Transducer Failure
AL69 Suction Temperature
Sensor Failure
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.
Internal
ERR ERR
Microprocessor Microprocessor
#
Failure
Enter Setpoint
Entr
(Press Arrow &
StPt
Enter)
Low Main Voltage
(Function Codes
LO
Cd27--38 disabled
and NO alarm
stored.)
T-296
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Table 3-6 Controller Alarm Indications (Sheet 3 of 3)
Alarm 64 is triggered if the discharge temperature sensed is greater than 135_C
(275_F) for three continuous minutes, if it exceeds 149_C (300_F), or if the sen-
sor is out of range. This is a display alarm and has no associated failure action.
Alarm 65 is triggered by a compressor discharge transducer reading outside the
valid range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
play alarm and has no associated failure action.
Alarm 66 is triggered by a suction pressure transducer reading outside the valid
range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
alarm and has no associated failure action.
Alarm 67 is triggered by a humidity sensor reading outside the valid range of 0%
to 100% relative humidity. If alarm AL67 is triggered when the dehumidification
mode is activated, then the dehumidification mode will be deactivated.
Alarm 68 is triggered by a condenser pressure transducer reading outside the
valid range of 73.20 cm Hg (30 in Hg) to 32.34 Kg/cm
play alarm and has no associated failure action.
Alarm 69 is triggered by a suction temperature sensor reading outside the valid
range of --60_C (--76_F) to 150_C (302_F). This is a display alarm and has no
associated failure action.
The Controller performs self-check routines. if an internal failure occurs, an
"ERR" alarm will appear on the display. This is an indication the Controller needs
to be replaced.
ERROR
ERR 0 -- RAM failure
ERR 1 -- Program
Memory failure
ERR 2 -- Watchdog
time--out
ERR 3 -- On board timer
failure
ERR 4 -- Internal counter
failure
ERR 5 -- A-D failure
The Controller is prompting the operator to enter a set point.
This message will be alternately displayed with the set point whenever the supply
voltage is less than 75% of its proper value.
search engine
2
NOTE
DESCRIPTION
Indicates that the Controller working memory has
failed.
Indicates a problem with the Controller program.
The Controller program has entered a mode where-
by the Controller program has stopped executing.
The on board timers are no longer operational.
Timed items such as; defrost, etc. may not work.
Internal multi-purpose counters have failed. These
counters are used for timers and other items.
The Controller's Analog to Digital (A-D) converter
has failed.
3-20
2
(460 psig). This is a dis-
(460 psig). This is a display
2
(460 psig). This is a dis-