Norcold DC-0040 Bedienungsanleitung

DCXXXX, DEXXXX Model

Compressor Refrigerators

Service Manual

DE0040, DE0051

DE0240T, DE0251T

DC0740(X), DE0740(X)

DC0751(X), DE0751(X)

DC0040(K), DC0051(K)

MODELS

Part No. 631842A (08-08-07)

Please note that the "X" at the end of certain model

numbers indicates the equipment color; where "X" can

be "B" (black), "S" (stainless steel, or "W" (wrapped

door - stainless steel).

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Refrigerator Service Manual

Table of Contents

Troubleshooting - Procedure A

Compressor Doesn't Run with Thermostat "On" .............3

Troubleshooting - Procedure B

Compressor Resistance..................................................4

Measuring the Compressor Resistance ..........................4

Troubleshooting - Procedure C

Power Supply Output Voltage .........................................5

Troubleshooting- Procedure D

Measuring Compressor Amp Draw .................................6

Troubleshooting - Procedure E

Verifying Thermistor Operation .......................................7

Troubleshooting - Procedure F

Insufcient Cooling..........................................................8

Troubleshooting - Procedures G

Refrigerator is Too Cold ..................................................8

Troubleshooting - Procedure H

Auto Shut-Off Device.......................................................8

Operating the Shut-Off Device....................................8

Troubleshooting - Procedure I

Proper Ventilation............................................................9

Wiring Schematic ............................................................9

Troubleshooting - Quick Reference

Quick Reference Troubleshooting Steps.......................10

WARNING! Perform all tests using a fully

charged 12V DC battery. Using other equip-

ment that supplies DC voltage may cause

permanent refrigerator component failure.

Refrigerator Service Manual 3

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure A

Thermostat “ON” Compressor Does Not Run

Measure Terminal

Voltage Of Temperature

Control Between TP1 &

TP2. (See Figure 1)

DC 0V

DC 5V

DC 2V

Short Circuit

Normal

DC Power

Supply Failure

Change DC

Power Supply

Change DC

Power Supply

See

Procedure B

Measure Terminal

Voltage of Temperature

Control Between TP2 &

TP3. (See Figure 1)

Is Temperature

Control LED on? YES

Correct

Voltage OK

Check Supply

Voltage

(10.5 – 32V DC)

(85 – 132V AC)

CORRECT

INCORRECT

Compressor

Runs YES

Replace

10A Fuse

(See Figure 2)

Reverse Polarity

& Check Operation

(Red + / Black -)

Replace

10A Fuse

(See Figure 2)

Check DC

Polarity INCORRECT

Compressor

Runs YES

Check Both

DC Fuses BLOWN

Compressor

Runs YES

DC 0V

DC 12

to 32V

DC Power

Supply Failure

Normal

Change DC

Power Supply

See

Procedure B

Note: Measurements taken with 12.8V DC or 120V AC power supply.

Check AC

Power Supply

(37 – 45V DC)

(See Figure 5)

Change AC

Power Supply

Short Circuit Change DC

Power Supply

GOOD

BAD

OPERATION

Power

Source DC

Check AC

Power Supply

(37 – 45V DC)

(See Figure 5)

DC Power

Supply Failure

Change DC

Power Supply

Change AC

Power Supply

GOOD

BAD

OPERATION

ART01945

ART01944

Brown

Red

Black

Figure 1. Temperature Control

ART01946

Figure 2. Fuse Locations

NOTE: If 10 Amp fuse is blown, check the vehicle's wiring.

Compressor Doesn't Run with Thermostat "On"

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Refrigerator Service Manual

Troubleshooting - Procedure B

Compressor Resistance

Measure

Compressor

Resistance.

See Figure 3.

0

 

1.4 – 3.5 Normal

Internal

Compressor

Failure

See

Procedure C

Change

Cooling Unit

Note: Perform procedure at room temperature.

ART01947

Measuring the Compressor Resistance

Turn the temperature control to the "Off" position.1.

Remove the black wire to the compressor.2.

Measure the resistance of the compressor between point3.

A and point B. Refer to Figure 3.

Figure 3. Measuring Compressor Resistance

ART01958

Compressor Resistance

Refrigerator Service Manual 5

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure C

Power Supply Output Voltage

Change DC

Power Supply

Change DC

Power Supply

Change DC

Power Supply

Change DC

Power Supply

Change DC

Power Supply

Change DC

Power Supply

DC Power

Supply Failure

DC Power

Supply Failure

DC Power

Supply Failure

DC Power

Supply Failure

Check AC Power

Supply.

(37 - 45V DC)

(See Figure 5)

Check AC Power

Supply.

(37 - 45V DC)

(See Figure 5)

Power

Source

Less than

15V AC

15 - 25V

Measure Voltage

Between A & B

At the Compressor

(See Figure 4)

Go to

Procedure E

Change

Thermistor

Normal See

Procedure D

0V AC

OPERATION

OPERATION GOOD

GOOD

BAD

GOOD

THERMISTOR

FA U LT Y

THERMISTOR

Note: Measurements taken with 12.8V DC or 120V AC power supply.

ART01948

ART01949

Figure 4. Measuring Power Supply Output Voltage

ART01950

Figure 5. Measuring AC Power Supply Output

Power Supply Output Voltage

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Refrigerator Service Manual

Troubleshooting- Procedure D

Compressor Amp Draw

Measure Amperage at

‘A’ on the Compressor

(See Figure 6)

Normal

40Watt = 1.6 – 2.0Amps

60Watt = 2.7 – 3.3Amps

40Watt < 1.6Amps

60Watt < 2.7Amps

40Watt > 2.0Amps

60Watt > 3.3Amps

Compressor

Failure

Compressor

Failure

Change

Cooling Unit

Change

Cooling Unit

Note: Measurements taken with 12.8V DC power supply.

ART01952

ART01953

Figure 6. Measuring Compressor Amp Draw

Measuring Compressor Amp Draw

Refrigerator Service Manual 7

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure E

Verifying Thermistor Operation

To measure the resistance of the evaporator thermistor, com-

plete the following procedure.

Turn the temperature control to the "Off" position.1.

Disconnect the 3-pole connector. Refer to Figure 7.2.

Measure the resistance across the two pins. Refer to3.

Figure 8.

Check the evaporator thermistor by measuring the tem-4.

perature and resistance of the thermistor.

Refer to Table 1 for a listing of acceptable resistance

ranges.

NOTE: In general, 1.6K - 29KΩ = good thermistor.

∞Ω = defective thermistor. An open thermistor

will stop normal compressor operation. Replace

the defective thermistor.

Evaporator Thermistor Resistance

Thermistor Temperature

(°F) (°C)

Resistance Allowable

Resistance

Range

0 -18 9.7 KΩ8.7 - 10.7 KΩ

10 -12 7.8 KΩ7.0 - 8.6 KΩ

20 -7 6.4 KΩ5.7 - 7.0 KΩ

30 -1 5.3 KΩ4.8 - 5.7 KΩ

40 4 4.5 KΩ4.0 - 4.9 KΩ

50 10 3.6 KΩ3.2 - 4.0 KΩ

60 16 2.8 KΩ2.5 - 3.1 KΩ

70 21 2.1 KΩ1.9 - 2.3 KΩ

80 27 1.9 KΩ1.7 - 2.0 KΩ

90 32 1.8 KΩ1.6 - 1.9 KΩ

Table 1. Evaporator Thermistor Resistance

ART01955

Figure 8. Measure Resistance Across Pins

ART01954

Figure 7. Evaporator Thermistor Connection

(Inside Power Supply)

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Refrigerator Service Manual

Troubleshooting - Procedure F

Insufcient Cooling

NOTE: Check input voltage before proceeding. Refer to

Procedure A.

If the compressor runs continuously, do the following:

Check the voltage across the fan leads. There will■

be a slight voltage reading even if the fan isn't opera-

tional. The fan will only operate when the compressor

is running, and the ambient temperature is sufcient to

engage the fan. The operational voltage of the fan is

between 17 and 22VDC. If this is present at the leads

and the fan is not running, replace the fan.

CAUTION: When servicing the fan, do not

short the wires. Shorting the wires will damage

the power supply.

Make sure that the ventilation vents are not blocked.■

Refer to Procedure I.

Make sure that the auto shut-off device is operational.■

Refer to Procedure H.

If the reason for insufcient cooling is not found, start ■

with Procedure B.

Replace the cooling unit if:

The compressor is hot to the touch and not vibrating.■

The compressor vibrates but there is no cooling.■

Troubleshooting - Procedure G

Refrigerator is Too Cold

If the refrigerator is too cold, do the following:

Adjust the temperature control to a lower setting. Num-■

ber 1 is the warmest setting; number 5 is the coldest.

Make sure that the thermistor is securely mounted to■

the evaporator plate.

If you cannot determine a cause, refer to Procedure E.■

Troubleshooting - Procedure H

Auto Shut-Off Device

NOTE: Only the 12/24V DC and DE/Truck models are

equipped with the auto shut-off device within the

power supply.

Operating the Shut-Off Device

To protect the cooling unit from overheating, the refrigerator

will automatically shut-off when the ambient air temperature is

approximately 110°F (43°C). If shut-off occurs, the refrigerator

will sound an intermittent alarm tone. To stop the alarm, the

refrigerator must be restarted using the following procedure:

Turn the temperature control counterclockwise to the "Off"1.

position.

Turn the temperature control to the desired setting.2.

NOTE: The refrigerator will not restart until the ambient

conditions allow for normal operation.

NOTE: To test the shut-off device's functionality, heat the

device with a heat gun. Refer to Figure 9.

ART01956

Figure 9. High Temperature Shut-off Device

Refrigerator Service Manual 9

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure I

Proper Ventilation

Ventilation is necessary for the correct operation of the refrig-

erator. Good ventilation also increases the life of the refrigera-

tor's cooling system. The current models are equipped with

built-in ventilation systems that draw cooler air through the

lower intake vent. This air is then circulated over the cooling

unit to remove excess heat from the cooling system. The heat-

ed air is then rejected through the upper vent. If this airow is

blocked or decreased, the refrigerator will not cool correctly.

CAUTION: Do not block the vents by closet

or cabinet doors.

Reducing the vent area can cause the following:

Shortened life of the refrigeration-cooling unit.■

Poor cooling performance of the refrigerator.■

Continuous operation of the refrigerator.■

Fast battery discharge.■

Voiding the refrigerator warranty.■

AC 85~132V

ORANGE

WHITE

AC IN(L)

AC IN(N)

B3P-VH AC/DC

converter

AC/DC PART

DC OUT + RED

DC OUT - BLACK

DC INPUT

CN1

B2P-VH

FAN MOTOR

24V DC

RED BLACK

XHP-2

B2B-XH-A

CONDENSOR

COUPLING

CN2

B3P-VH VHR-3N

SK515-N

INVERTER

ELECTRONIC

CURRENT

PROTECTOR

RED

BLACK

BATTERY IN +

BATTERY IN -

FUSE

BATTERY

MONITOR

(OPTIONAL)

ELECTRONIC

THERMOSTAT

DC/DC

converter

INPUT HIGH

VOLTAGE

PROTECTOR

HIGH TEMPERATURE

PROTECTER

BUZZER (OPTIONAL)

LOW TEMPERATURE

PROTECTER

DC 39V FOR 40W

DC 41V FOR 60W

CN4

B2B-EH

EHR-2

BLACK BLACK

EVAPORATOR

THERMISTOR

AMBIENT

THERMISTOR

AMBIENT

THERMISTOR

DC/AC PART

DC 12~32V

FUSE

ART01957

Wiring Schematic

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Refrigerator Service Manual

Troubleshooting - Quick Reference

Quick Reference Troubleshooting Steps

Check for supply voltage at the rear of the refrigerator.1.

Turn the temperature control to the "On" position.2.

The operating voltage should be between 10.5V and

32V DC. There will be some variation in these readings

depending on the supply voltage.

Check the compressor voltage between points A and B.3.

Voltage should be between 15V - 25V AC. Refer to Figure

10.

If voltage is not within range, refer to Procedure C.

With the refrigerator power on, take an Ohm reading (1.44.

- 3.5Ω) at the compressor between points A and B. Refer

to Figure 11.

If the Ohm reading is not within range, refer to Procedure

With the refrigerator power off, and the lead removed5.

from point "A", take an Amp reading (1.6 - 3.3 Amps) at

the black wire with the rubber boot. Refer to Figure 12. If

amperage is not within range, refer to Procedure D.

ART01949

Figure 10. Checking Compressor Voltage

ART01958

Figure 11. Taking an Ohm Reading

ART01953

Figure 12. Measuring the Amp Draw

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