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Freightliner Refrigerator
Troubleshooting Guide
For
750000005 (TJ18F)
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION
750000011 (TJ22F)
P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248
750000026 (TJ18FP3)
www.dometic.com
Before initiating troubleshooting, the following equipment is recommended:
Multimeter, 20 gauge (min) wires to use as jumpers, and 12Vdc source.
Before applying power, stand unit upright for a minimum of 1 hour to allow compressor
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Locating the Dataplate There are two Dataplates bearing the model number, serial number and technical data. One is located on the right-side panel inside the appliance (fig. 1) and the other is located on the back of the unit (fig 2). Figure 1 Figure 2 The first three digits of the serial number indicate the Year and Week of manufacture. Example: the Dataplat
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) General Trouble-Shooting A: Appliance Does Not Operate. Check: 1. The thermostat knob is “ON”, and turned, at least, half way. 2. The electrical system circuit breaker for the refrigerator is “ON”. 3. The fuse between the Danfoss Module electronic control unit and the power source is good. 4. The power supply cable is not faulty, loose or poorly connected. 5. The v
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) LOAD DUMP DANFOSS Module Module 7. The battery is delivering sufficient power. If the power voltage is less than 10.4VDC, the unit will not operate. Check incoming voltage with multimeter by putting the black lead on the negative terminal of the LOAD DUMP module and the red lead on the positive terminal as shown. Unit must be running to check thi
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) The LOAD DUMP module is defective if the unit operates while wired to the DANFOSS module. Replace Load Dump module. 9. If LOAD DUMP module is working properly, check the speed resistor. This component is used to control the speed of the compressor and is located on the “T” terminal of the DANFOSS module. Speed Resistor Turn off power
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Thermostat knob lead connections If the thermostat is working correctly, the multimeter should indicate continuity. In addition, check the speed resistor with the multimeter. This resistor is used to set the compressor motor speed. Connect multimeter leads to either end of resistor assembly and set meter to resistance, Ω. This is a 277-ohm resistor
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Change DanFoss Module. Isolate unit from its source of energy by disconnecting the power before performing the following procedure: A. Remove all wires from compressor module and load dump (make note where they are connected). B. Removed Danfoss module from the compressor by removing the mounting screw and twisting the module to t
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) B: Insufficient Refrigerating Capacity. Check: 1. The door is sealed properly and the refrigerator is not positioned close to heat sources. 2. Ice build up in and on freezer compartment. 1/8” maximum. Defrost Freezer by turning power off and let ice melt. Do not chip ice off freezer compartment because freezer plate can be damaged. 3. The refrigerator is sufficiently venti
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Specific Trouble-Shooting of Electrical Components A: Check incoming voltage 1. Hold multimeter leads to the positive (+) and negative (-) terminals of the load dump module. The red lead from the multimeter is held to the “+” terminal and black lead from the multimeter is held to the “-“ terminal. You should read positive voltage. If the reading is negative, check DC pol
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Compressor terminals (Current lead-in pins) 4. Check each pin (motor winding) for continuity to ground. A multimeter can be used in some cases but an insulation tester by “Meggar” should be used. If there is any continuity to ground then the compressor is internally shorted and will need to be replaced. This is not a field operation. 5. If a problem is not found in the
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) D. The Refrigerant Circuit 1. If the refrigerator seems to be running properly and passes all of the above tests and there is no cooling in the unit then the problem may be a refrigerant leak. 2. Do not attempt to charge unit in field. Contact your service dealer or Dometic Corporation at 804-764-1313 or 1-800-234-8778. Ask for the service department. ELECTRICAL CONNECTIO
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) Overload Protections The compressor overload and start protection cuts off power to the compressor if the compressor speed drops below approximately 1,900 rpm, or if this motor speed is not reached during the start sequence. Possible reasons for overload protection activating could be too high refrigeration system pressures during operation or lack of pressure equalizing at star
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) DOMETIC CORPORATION, ENVIRONMENTAL DIVISION P.O. Box 15299 I Richmond, VA 23227 USA Phone +804 746 1313 | Fax +804 746 7248 www.dometic.com Page 13 of 20
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) DOMETIC CORPORATION, ENVIRONMENTAL DIVISION P.O. Box 15299 I Richmond, VA 23227 USA Phone +804 746 1313 | Fax +804 746 7248 www.dometic.com Page 14 of 20
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) This drawing illustrates model TJ18F. It is to be used only as a reference for model TJ18FP3. DOMETIC CORPORATION, ENVIRONMENTAL DIVISION P.O. Box 15299 I Richmond, VA 23227 USA Phone +804 746 1313 | Fax +804 746 7248 www.dometic.com Page 15 of 20
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) ID Service Part Description 4 3311370.000 THERMOSTAT KIT 14 3310735.000 KIT, WARNING DECAL 100 3311359.000 TRAY KIT 101 3311360.000 FAN KIT 103 3311363.000 RETAINER KIT 107 3311451.000 FRAME KIT, TJ18F 109 3311368.000 MODULE KIT, DANFOSS 110 3311369.000 RESISTOR KIT 112 3311371.000 HOUSING KI
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) This drawing illustrates model TJ22F. DOMETIC CORPORATION, ENVIRONMENTAL DIVISION P.O. Box 15299 I Richmond, VA 23227 USA Phone +804 746 1313 | Fax +804 746 7248 www.dometic.com Page 17 of 20
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) ID Service Part Description 4 3311370.000 THERMOSTAT KIT 14 3310735.000 KIT, WARNING DECAL 100 3311359.000 TRAY KIT 101 3311360.000 FAN KIT 103 3311363.000 RETAINER KIT 107 3311454.000 FRAME KIT, TJ22F 109 3311368.000 MODULE KIT, DANFOSS 110 3311369.000 RESISTOR KIT 112 3311372.000 HOUSING KI
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) WARNING Dometic Corporation, Environmental Division (Dometic) manufacturers of Dometic Refrigerator products, makes the following safety warnings concerning the application, installation, use and care of its products. Although these warnings are extensive, there may be specific hazards which may arise out of circumstances which we have not outlined herein. Use this as a guide
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Freightliner Refrigerator Troubleshooting Guide 750000005 (TJ18F) 750000011 (TJ22F) 750000026 (TJ18FP3) dangerous gas or vapor could exist. If a unit is installed in such a manner that allows potentially lethal gases or vapors to be discharged by the air handling unit into the living space, this could result in loss of life. Maximum protection against the introduction of dangerous gases or vapors into living spaces can be obtained through the introduction of clean air into the li
