Dometic 750000026TJ18FP3, 750000011TJ22F, 750000005 TJ18F User Manual
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:
Load dump
including
Power Input
Danfoss
Module
Condenser
Cooling Fan
Strainer
Cap Tube
(Expansion Device)
Condenser Coil
Compressor
Speed Resistor
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 1-800-2348778 or 804-764-1313.
Refrigerator Components
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
P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248
www.dometic.com Page 2 of 20
Freightliner Refrigerator Troubleshooting Guide
Positive Lead
from
Multimeter
Negative lead
from
multimeter
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:
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
P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248
www.dometic.com Page 3 of 20
Freightliner Refrigerator Troubleshooting Guide
LOAD DUMP
Module
DANFOSS
Module
LOAD DUMP
Module
DANFOSS
Module
Positive Lead
from
Multimeter
Negative lead
from
multimeter
See Wiring
Diagram in the
later sections
750000005 (TJ18F)
750000011 (TJ22F)
750000026 (TJ18FP3)
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.
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.
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 4 of 20
Freightliner Refrigerator Troubleshooting Guide
Speed Resistor
Blue Wire from
thermostat
Speed Resistor connected to
other blue wire from
thermostat
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.
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.
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 5 of 20
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.
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
P.O. Box 15299 I Richmond, VA 23227 USA
Phone +804 746 1313 | Fax +804 746 7248
www.dometic.com Page 6 of 20
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