Carrier VECTOR 1800 MT, Operation & Service Manual

Page: 163 / 315

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Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
53 BOX TEMP OUT--OF--RANGE
• TRIGGER–ON:
Alarm Only:
Condition One: If the unit is not running in Sleep Mode and Compartment One box temperature has
been in range [within
±
2.7
°
F (
±
1.5
°
C) for perishable setpoints or +2.7
°
F (
±
1.5
°
C) for frozen setpoints] at
least once since the unit was started and is now further away from setpoint than the limit set in the
functional parameters for the Out--of--Range Value [ 4
°
, 5
°
, or 7
°
F (2
°
, 3
°
, or 4
°
C)] for 30 continuous
minutes OR
Condition Two: If SAT is configured ON and Compartment One is running in cool and the DeltaT (SAT
minus RAT) is not greater than --1
°
F (0.56
°
C) for 30 continuous minutes or if Compartment One is
running in heat and the SAT2 is not greater than the RAT2 for 30 continuous minutes. OR
Condition Three: If a shutdown alarm occurs and the RAT2 temperature is further away from setpoint
than the limit set in the functional parameters for the Out--of--Range value [ 4
°
, 5
°
, or 7
°
F (2
°
, 3
°
, or 4
°
C)]
for more than 30 continuous minutes regardless if Compartment One box temperature has been
in--range.
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 micro is configured for shutdown and the setpoint
for Compartment 2 is in the perishable range -- engine and unit shutdown and alarm. If the micro is
configured for shutdown and the setpoint for Compartment 2 is in the frozen range, only Compartment 2
will shut off. Otherwise, alarm only.
• RESET CONDITION: Auto Reset or Alarm may be manually reset via Keypad or by turning the unit off,
then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active alarm
should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if any active
alarm occurs. Continue with the steps below as necessary.
1. Check Compartment Doors
a. Inspect all trailer compartment doors Must be closed, no air leakage
2. Defrost Evaporator
a. Initiate Manual Defrost Cycle Must terminate automatically.
3. Check For Low Refrigerant Pressure Alarm
a. Check for alarm 18 Alarm conditions must be corrected and the alarm cleared
to continue
4. Check Refrigerant Level
a. Visually check refrigerant level in
receiver tank.
Must be at correct level.
5. Check Evaporator Airflow Alarm
a. Check for alarm 56 Must be corrected and cleared to continue
6. Perform Pre--trip Check
a. Run pre--trip & check for alarms Any active alarms must be corrected and cleared before
proceeding.
7. Check System Pressures
a. Install Manifold Test Set and check
system pressures.
Suction & Discharge Pressures must be in the normal
range. Suction & Discharge Pressures must have the
same reading on gauges & on micro display.