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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 11 of 20
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 CONNECTION
Before connecting the appliance to the power supply, check that the line voltage
corresponds to the indications on the appliance rating plate and those of the compressor
plate. This appliance complies with the EC directive 89/336 governing radio suppression.
DC Wiring
For Direct Current (DC) refrigerators, connect the appliance to the DC distribution center.
A circuit breaker of 15 Amps (maximum) must be used if the system is 12VDC. Make sure
that proper polarity is maintained at all times. Check that all grounding systems are in good
working order. The appliance must be wired and grounded in accordance with the
Electrical Wiring Guidelines in this manual.
DANFOSS Compressor Data
Voltage Range
12V systems: From 10.4V to 17V
The electrical unit will calibrate automatically to the applied voltage. This means that if the
battery voltage is less than 17V, the electronic unit assumes that it is working in a 12V
system. If the voltage is higher than 17V, the electronic unit assumes that it is working in a
24V system. However, the compressor does not run at power supply voltages between 17V
and 22.8V, the desired battery protection cut-out voltage for 24V systems.
Protection Systems
The Danfoss compressor protection system facilitates protection against compressor
overload and start failure, fan overload and electronic unit overheating as well as destructive
battery discharge. When an overload protection is activated, the compressor enters a cycle
in which it makes start attempts at approximately 60 second intervals until a successful start
is achieved.