Enroute Inspections
To help prevent damage to the cargo, complete the following enroute inspection every four hours.
Inspection Procedure
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Verify the setpoint is correct.
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Check the return air temperature readings. The temperature readings should be within the desired temperature range. If the readings are not within this range, refer to ( Inspection Troubleshooting).
Inspection Troubleshooting
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If a return air temperature reading is not within the desired temperature range, refer to ( Inspection Troubleshooting). Correct the problem as needed.
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Repeat the Enroute Inspection every 30 minutes until the compartment temperature is within the desired temperature range. Stop the unit if the compartment temperature is not within desired temperature range on two consecutive 30 minute inspections, especially if the compartment temperature appears to be moving away from the setpoint.
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Immediately contact the nearest Thermo King Dealer.
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Take the necessary steps to protect and maintain proper load temperature.
Inspection Troubleshooting
| Problem | Cause | Remedy |
|---|---|---|
| Return air temperature reading is not within desired temperature range of the setpoint. | Unit has not had time to cool cargo to correct temperature. | Refer to load log history. Look for above temperature load records, properly pre-cooled cargo compartment, length of time on road, etc. Correct as required. Continue monitoring return air temperature until reading is within desired temperature range of the setpoint. |
| Unit may have a low refrigerant charge | Contact nearest Thermo King dealer, or call the Thermo King Cold Line for referral. | |
| Unit is in defrost or has just completed a defrost cycle. | Monitor return air temperature after defrost cycle is completed
to see if temperature returns to desired temperature range of the
setpoint.
Note Temperature will increase slightly during
defrost cycle.
|
|
| Evaporator is plugged with frost. | Initiate a manual defrost cycle. Defrost cycle will automatically terminate when complete. Continue monitoring return air temperature until reading is within desired temperature range of the setpoint. | |
| Return air temperature reading is not within desired temperature range of the setpoint. | Improper air circulation in the cargo compartment. | Inspect unit and cargo compartment to determine if evaporator
fans are working and properly circulating the air. Poor air circulation
may be due to improper loading of the cargo or shifting of the load.
Correct as required. Continue monitoring return air temperature until
problem is corrected.
|
| The unit did not start automatically. | Contact nearest Thermo King dealer, or call the Thermo King Cold Line for referral. | |
| Air leaks in cargo box. | Inspect cargo box for air leaks such as doors that are not fully closed or bad/missing door seals. Repair as necessary. |