DOMETIC CORPORATION, ENVIRONMENTAL DIVISION P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248 www.dometic.com
Freightliner Refrigerator Troubleshooting Guide
For 750000005 (TJ18F) 750000011 (TJ22F)
750000026 (TJ18FP3)
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 oil to settle.
NOTE: Although, Dometic states on the packaging to always keep unit upright, we cannot control how the carrier handles our boxes. This also applies if the unit has been set on its side to affix any accessories.
If there are any questions, please contact our warranty and service department at 1-800-234- 8778 or 804-764-1313.
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Cap Tube |
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Load dump |
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Condenser Coil |
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Power Input |
Refrigerator Components |
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Strainer |
Danfoss |
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Compressor |
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Condenser |
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Speed Resistor |
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Module |
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Cooling Fan |
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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 Dataplate above has a serial number of 71305899
7=Year 2007
13=13th week of the year 05899=Sequential Unit Number
TROUBLE-SHOOTING
The guidelines are arranged sequentially and should be followed in order until the problem is solved. Start with “General Trouble-Shooting” sections A and B; then, go to “Specific Trouble-shooting of Electrical Components”, start with section A and work systematically to section D.
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION |
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P.O. Box 15299 I Richmond, VA 23227 USA |
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Phone +804 746 1313 | Fax +804 746 7248 |
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www.dometic.com |
Page 2 of 20 |
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 voltage on the Load Dump module corresponds to that of the battery. If there is a voltage drop of 0.2-0.4v check:
Positive Lead |
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Negative lead |
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Multimeter |
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multimeter |
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A.The size of the cable connecting the battery to the Load Dump module corresponds to specifications (see electrical wiring guidelines in this manual).
B.All connection points in the power circuit are properly tightened and secure.
C.There are no signs of oxidation on the battery poles or contact points and the battery is properly maintained.
6.Insure the LOAD DUMP module is installed properly on the Danfoss Module. The three pins on the LOAD DUMP module must “line up” with the top three pins of the Danfoss Module.
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION |
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P.O. Box 15299 I Richmond, VA 23227 USA |
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Phone +804 746 1313 | Fax +804 746 7248 |
|
www.dometic.com |
Page 3 of 20 |
Freightliner Refrigerator Troubleshooting Guide
750000005 (TJ18F)
750000011 (TJ22F)
750000026 (TJ18FP3)
LOAD DUMP
Module DANFOSS
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 this function.
Negative lead from multimeter
Positive Lead from Multimeter
8.If 12 volts are available to the unit as shown in step 7, check to see if the LOAD DUMP module is defective. This module is used as a surge protector for the unit. Removed the module from the unit and remove all wires. Wire the Danfoss module as shown with the wires that were on the LOAD DUMP module.
See Wiring Diagram in the later sections
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LOAD DUMP |
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DANFOSS |
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Module |
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Module |
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DOMETIC CORPORATION, ENVIRONMENTAL DIVISION |
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P.O. Box 15299 I Richmond, VA 23227 USA |
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Phone +804 746 1313 | Fax +804 746 7248 |
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www.dometic.com |
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Page 4 of 20 |
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 and disconnect the speed resistor from the Danfoss module. Remove the speed resistor from the blue wire and connect the blue wire on the
Danfoss module terminal “T” where the speed resistor was removed.
Connect power (12volts) back to the unit. If the unit performs, the speed resistor is faulty. Replace Speed Resistor.
10.Test the Thermostat Circuit. Remove the blue wire that is connected on terminal
“C” and remove the (black) Speed resistor (attached to the other blue wire) connected to terminal “T” of the Danfoss module. These two wires represent the thermostat circuit.
Blue Wire from thermostat
Speed Resistor connected to other blue wire from thermostat
Make sure the thermostat knob is turned on, remove the speed resistor, set multimeter to check continuity and connect meter leads to these wires as shown.
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION |
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P.O. Box 15299 I Richmond, VA 23227 USA |
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Phone +804 746 1313 | Fax +804 746 7248 |
|
www.dometic.com |
Page 5 of 20 |
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. It should read between 265 and 280 ohms.
11.An additional test to use if a multimeter is not available:
Turn the unit off and disconnect both blue wires that were connected to the Danfoss module terminals “T” and “C”. Place the jumper wire across these terminals as illustrated.
Energize unit and if unit operates, this action indicates the problem may be a bad thermostat. Replace thermostat.
DOMETIC CORPORATION, ENVIRONMENTAL DIVISION |
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P.O. Box 15299 I Richmond, VA 23227 USA |
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Phone +804 746 1313 | Fax +804 746 7248 |
|
www.dometic.com |
Page 6 of 20 |