Carrier VECTOR 6500 Operation & Service Manual page 171

Alarm
Steps
NO.
53 BOX TEMP OUT-OF-RANGE - Continued
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 page 7−2.) 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
Inspect all trailer compartment doors. Must be closed, no air leakage.
2 Defrost Evaporator
Initiate Manual Defrost Cycle.
3 Check For Any Shutdown Alarm(s)
Check
Shutdown Alarms.
4 Check For Low Refrigerant Pressure Alarm
Check for alarm 18.
5 Check Refrigerant Level
Visually check refrigerant level in
receiver.
6 Check System Pressures
Install manifold gauge set and check
system pressures.
7 Check Evaporator Motor or Contactor Alarm
Check for alarm 77 or 109.
8 Verify accuracy of RAT & SAT sensors
Verify accuracy of RAT & SAT using
infrared or other accurate temperat-
ure testing tool.
9 Perform Pretrip Check
Clear Active Alarm list, then run
Pretrip & check for any new alarms.
10 Check For Low Delta-T
Read Delta-T from Unit Data.
62-11389
Alarm/Cause
the Alarm List for
Corrective Action
Must terminate automatically.
All ice cleared from evaporator coil.
any Alarm conditions must be corrected and the alarm
cleared to continue.
Alarm conditions must be corrected and the alarm
cleared to continue.
Must be at correct level. Refer to Section 8.6.2.
Suction & Discharge Pressures must be in the nor-
mal range. Suction & Discharge Pressures must
have the same reading on gauges & on micro dis-
play.
Must be corrected and cleared to continue.
RAT & SAT readings must be within $3°F (1.7°C) of
test temperature tool reading.
Any active alarms must be corrected and cleared
before proceeding.
In Cool, the Delta-T must be greater than(cooling
more than) -1°F (-0.56°C.)
In Heat the Delta-T must be greater than 0 (SAT
must be higher than RAT.)
7−38