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Diagnosis: Troubleshooting, Status Messages, Alarm Codes
172
19
Temperature Too Far From Setpoint
(Check Alarm)
• After 75 minutes of operation, supply or return air
temperature is not in-range and does not approach
setpoint within preset pull-down rate.
• Indicates:
• Ice or frost on evaporator coil
• Low refrigerant charge
• Air exchange vent open too much
• Container air leakage (doors open)
• Press S
UP
/R
ET
key to check supply and return
air sensor temperatures. Compare
temperatures to evaluate unit cooling capacity
and performance.
• Temperature difference should be 4 C to 6 C
(39 F - 43 F).
• Open evaporator door. Inspect coil for ice or
frost and initiate manual defrost if necessary.
• Check refrigerant charge
NOTE: This alarm can be activated if the
supply or return air temperature varies,
even if the mean temperature does
approach setpoint.
20
Defrost Time Too Long
(Check Alarm)
• Heat signal has been on for more than 90 minutes
on 60 Hz power during Defrost (120 minutes on 50
Hz power).
• Indicates:
• Low power supply voltage
• Defective heater elements
• Defective evaporator high temperature protection
switch
• Defective heat relay
• Evaporator fans running during defrost
• Evaporator sensor placed wrong
• Initiate a manual defrost and check amperage
draw and evaporator coil temperature.
Evaluate defrost performance.
• Open evaporator door and check location of
evaporator coil sensor.
NOTE: This alarm can be activated at low
voltage and very low box temperature
conditions, even under normal operating
conditions.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code
Description
Corrective Action
Содержание 098916
Страница 2: ...MAGNUM TK 51122 4 MM Rev 6 02 06 Copyright 2004 Thermo King Corp Minneapolis MN USA Printed in USA...
Страница 5: ......
Страница 11: ...Table of Contents 10...
Страница 19: ...Service Guide 18...
Страница 28: ...Specifications 27 Figure 2 Physical Specifications AMA313...
Страница 41: ...Unit Description Features Options 40...
Страница 105: ...Operating Instructions 104...
Страница 155: ...Servicing The Unit 154...
Страница 187: ...Index 186...
Страница 189: ...Wiring and Schematic Diagrams Index 188...
Страница 190: ...189 Wiring Schematic...
Страница 191: ...190 Wiring Diagram Page 1 of 2...
Страница 192: ...191 Wiring Diagram Page 2 of 2...