Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 7-34
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
53 BOX TEMP OUT-OF-RANGE

TRIGGER-ON:
Alarm Only:
Condition One: The refrigerated compartment temperature has been in range [within ±1.5°C (±2.7°F)
for perishable set points or ±1.5°C (±2.7°F) for frozen set points] at least once since the unit was
started and is now further away from set point than the limit set in the functional parameters for the
Out-of-Range Value [ 2°, 3°, or 4°C (4°, 5°, or 7°F)]
for 15 continuous minutes (30 minutes following a
defrost cycle) OR
Condition Two: The unit is running in COOL and the Delta T (SAT minus RAT) is not greater than -
0.56°C (-1°F) for 30 continuous minutes or if the unit is running in HEAT and the SAT is not greater
than the RAT for 30 continuous minutes OR
Condition Three: If a shutdown alarm occurs and the RAT temperature is further away from set point
than the limit set in the functional parameters for the Out-of-Range value [ 2°, 3°, or 4°C (4°, 5°, or
7°F)] for more than 30 continuous minutes regardless if the refrigerated compartment temperature
has been in-range or not.
Shut Down & Alarm:
Condition One: When configured for shutdown the unit will shut down when the conditions for Alarm
Only Condition One are met for 45 continuous minutes.
Condition Two:
When configured for shutdown the unit will shut down when the conditions for Alarm
Only Condition Two are met for 30 continuous minutes.

UNIT CONTROL: Engine and standby operation:
If the microprocessor is not configured for shutdown, alarm only.
If the microprocessor is configured for shutdown the engine and unit will shutdown
and alarm.

RESET CONDITION: Condition 1: Auto Reset when the refrigerated compartment temperature is
within ±1.5°C (±2.7°F) of set point;
Condition 2: Auto Reset when the Delta T is greater than -0.56°C (-1°F); or
For either Condition, alarm may be manually reset via Keypad OR by turning the unit off, then back
on again.
NOTE: For Condition One, the temperature criteria for this alarm is reset, and the refrigerated compartment tem-
perature must again go In-Range before this alarm can be triggered if any of the following occur:

Pretrip is started.

Set point is changed.

A door switch or remote switch is installed and configured as a door switch, and the switch is opened indicat-
ing that the refrigerated compartment door has been opened.
NOTE: The 15, 30, or 45 minute timer is reset and starts again whenever:

The unit cycles off and restarts in Start-Stop.

The unit goes into and comes out of Defrost.
NOTE: This alarm does not go into the Inactive alarm List when it becomes inactive or is cleared.
NOTE: This alarm will not be used in Sleep Mode.
Troubleshooting steps begin on the next page.