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Diagnosis: Troubleshooting, Status Messages, Alarm Codes
174
27
Heat Capacity Test Error
(Check Alarm)
• Occurs during pretrip (PTI) test only.
• Difference between supply and return air
temperature is too small with high speed
evaporator fans (less than 0.4 C [0.7 F]).
• Indicates:
• Incorrect location of supply or return air sensor
• Air leakage at supply, return or evaporator coil
sensor cable
• Defective supply or return air sensor
• Interchanged sensor connections
• Defective heater elements
• Incorrect evaporator fan rotation or high speed
operation
• Container/side panels defective, damaged or
leaking
• Enter Manual Function Test and start
evaporator fans on high speed. Then select
Sensor Checks test and operate fans 2 to 5
minutes. Check supply, return and evaporator
coil (defrost) sensor temperatures. Sensor
readings should be the same (evaporator coil
may be 0.5 C [1.0 F] lower due to fan motor
heat).
NOTE: This sensor check does not detect
air leakage around the sensor cables.
• Open evaporator door and inspect evaporator
fan rotation. Make sure fans are rotating
correctly on high speed.
• Check the sensor connections.
28
Scroll Compressor, Low Pressure Indicates:
• Low pressure has occur from suction transducer
sensor
• Possible causes include low refrigerant charge,
defective pressure transducer, blocked TXV or
suction line restriction etc.
• Controller activates Alarm Code 31 after 5 min
• Controller clears message after compressor
start-up
31
Low Pressure Cutout Error
(Check Alarm)
• Occurs during pretrip (PTI) test only.
• Indicates:
• Low refrigerant charge
• Refrigeration system restriction at filter drier or
expansion valve
• Defective low pressure cutout switch
• Check discharge and suction pressure gauge
readings:
• If refrigerant pressures are low, check for a
restriction and leak check the refrigeration
system.
• If refrigerant pressures are high, check for a
high refrigerant charge (see below).
• Check for a restriction:
• Check for frost on down stream side of the
filter drier.
• Check for high evaporator superheat using
supply air sensor temperature readings in
Data menu or a frost pattern on expansion
valve side of the evaporator coil. A large
temperature difference between the left
hand and right hand supply air sensors
indicates a possible evaporator restriction or
incorrect superheat.
• Continuity check low pressure cutout switch
wiring using a high quality multimeter. Replace
switch.
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...