Dometic 750000005 (TJ18F) Manuale utente

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.

Refrigerator Components

Load dump

including

Power Input

Danfoss

Module

Condenser

Cooling Fan

Strainer

Cap Tube

(Expansion Device)

Condenser Coil

Compressor

Speed Resistor

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 2 of 20

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.

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 3 of 20

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.

Positive Lead

from

Multimeter

Negative lead

from

multimeter

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 4 of 20

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.

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

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 5 of 20

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.

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.

Speed Resistor

Blue Wire from

thermostat

Speed Resistor connected to

other blue wire from

thermostat

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 6 of 20

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.

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 7 of 20

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 the rear to disconnect it from the compressor.

C. Use screw driver to pry connector from compressor terminals. Use caution.

D. If changing the Danfoss module does not fix the problem, this may indicate the

compressor is bad.

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 8 of 20

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 ventilated.

4. Dust has not blocked the condenser ventilation sources.

5. The Condenser Cooling Fan rotates freely.

6. The compressor and fan are operating properly. The compressor is very quiet

during operation so it may be difficult to ascertain if it is running. A metal tube

or a screw driver, position on the compressor and your ear, may help you hear

the compressor motor when energized. If fan is running but the compressor

kicks on and off, or the compressor is not running, change the Danfoss module

(see Section A #12). If problem persists, it may indicate the compressor is bad

or a refrigerant leak.

7. The inside temperature needs to be around 34F to 40F. If the temperature starts

in this range but increases over time, put the refrigerator on a test bench, start it,

let it run for an hour and check the Cap Tube/ Strainer Assembly located in the

back of the unit. Look for condensation and/or ice accumulations as illustrated

in the following pictures:

If condensate or ice accumulates in these areas, replace unit.

Water condensation around strainer

usually indicates moisture in the system.

Ice accumulation around the cap

tube usually indicates blockage.

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 9 of 20

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 polarity. If it is reversed, correct wire

connections.

2. The inrush current must not drop the voltage more than 3% or .36 volts when the

compressor is initially energized. Monitor this voltage by using a multimeter at

start-up. For 12vdc system, the cutout is around 10.4 volts and the cut-in is 11.7

volts. If there is a drop in current, at start-up, below the cut out voltage, then the

compressor will not operate. A drop in voltage will occur if the wire size is too

small or poor connection.

3. Verify that voltage at unit is equal to voltage at source. If the voltage is less than at

the source then the wire used from source to unit is too small.

B. Checking the Compressor

1. Remove all wires from compressor module (make note where they are connected).

2. Removed Danfoss module from the compressor by removing the mounting screw

and twisting the module to the rear to disconnect it from the compressor. See

Section A #12 in “General Troubleshooting” Section.

3. Compressor windings can be checked for defects by measuring the resistance on the

current lead-in pins. If the measured values between all pins are approximately the

same (approximately 2.2-2.5 ohms). The compressor motor is OK.

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 10 of 20

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 compressor then the Danfoss module needs to be

replaced.

C. Checking the Fan

1. The Condenser Cooling Fan should come on after a five second delay once the

compressor starts.

2. Visually inspect fan for any blockages and make sure that it can turn freely.

3. If the fan can spin freely and is not working then first check the fan terminals “+”

(the lower of the two “+” symbols) and “F” on the module for voltage. The reading

should be approximately 12 volts.

4. If there is voltage at the module terminals then remove the fan wires from the

module and check for continuity through the fan itself by placing meter leads in each

fan wire push-on terminal. If there is no continuity through the fan then replace it.

Compressor terminals

(Current lead-in pins)

Condenser fan

terminals

(Current lead-in pins)

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