Norcold DC-440 Bedienungsanleitung

Refrigerator

Service Manual

Models:

DC440, DC451, DC490

DE441, DE451, DE461, DE490

MRFT415, MRFT440, MRFT460

Part No.619730E (01/01)

NORCOLD, INC.

P.O BOX 4248

SIDNEY, OH 45365-4248

-- Procedure A - Thermostat “ON” Compressor does not run ........................................................... 3

-- Procedure B - Compressor Resistance ....................................................................................... 4

-- Procedure C - Power Supply Output Voltage ............................................................................... 5

-- Procedure D - Compressor Amp Draw........................................................................................ 6

-- Procedure E - Evaporator Thermister Resistance ....................................................................... 7

-- Procedure F - Insufficient Coolling ............................................................................................... 8

-- Procedure G - Refrigerator to Cold.............................................................................................. 9

-- Procedure H - Auto Shut-OFF Device........................................................................................ 10

-- Wiring Schematic.......................................................................................................................11

-- Procedure I - Ventilation ....................................................................................................... 12-14

-- Quick Reference Repair Sheet ..................................................................................................15

Trouble Shooting - Table of Contents

WARNING

Perform all tests using a fully charged 12 VDC battery. Using other equipment that

supplies DC voltage may cause permanent refrigerator compressor failure.

Figure 1 - Temperature Control

Figure 2 - Power Supply

Note:

If 10 Amp fuse is blown, check wiring of vehicle

Trouble Shooting - Procedure A

Red

TP3

Brn

TP1

Blk

TP2

Yel Org

ART01190

Thermostat "ON" Compressor does not run

Is Temperature

Control LED on? YES

Measure terminal

voltage of Temperature

Control between

TP1 & TP2

DC 0 V

DC 5 V

DC 2 V

Short Circuit

Power Supply

Failure

Normal

Change

Temperature

Control

Change

Power Supply

See Procedure B

Good

Check DC Fuse

Bad

Replace fuse if defective

10A (DE/DC)

8A (MRFT)

See Figure 2

Compressor runs YES

Measure

terminal voltage of

Temperature Control

between TP2 & TP3

See Figure 1

DC 0 V

DC 12 to

32 V

Power Supply

Failure

Normal

Change

Power Supply

See Procedure B

Correct DC Voltage

Wrong Compressor runs YES

Good

(10.5 - 32 VDC)

Check Battery

Voltage

Check DC

Polarity Wrong

Reverse Polarity

& Check operation

(Red+/Blk-)

Good

Trouble Shooting - Procedure B

Figure 2 - Measuring Compressor Resistance

Turn the refrigerator to OFF.

Remove the black wire to the compressor. Measure

the resistance of the compressor bewteen Point A and

Point B.

Note: Perform procedure at room temperature.

Change

Cooling Unit

Measure

compressor

resistance

0Internal Compressor

Failure

Normal See Procedure C

+/-.5

ART01192

Compressor Resistance

Power Supply Output Voltage

Power Supply

Failure

Change

Power Supply

Normal See Procedure D

15 - 25

VAC

Measure voltage

between A & B

at the compressor

Below

15 V AC

0 V AC

Power Supply

Failure

Power Supply

Failure

Remove Power

Supply

Measure voltage

between A & B

at the compressor

ART01196

Check F3 fuse

on circuit board

Ohms:

Replace Power

Supply &

Cooling Unit

0Ohms:

Replace

Power Supply

Trouble Shooting - Procedure C

Figure 3 - Measuring Power Supply

Output Voltage

F3 Fuse

Figure 4 - DE Models only - F3

Fuse Location

Figure 4A - DC Models only - F3

Fuse Location

Trouble Shooting - Procedure D

Figure 5 - Measuring Amp draw of

Compressor

Three Pole Connector

Measure Resistance

Figure 6 - Evaporator Thermister Figure 7 -Evaporator Thermister

Table 1

Turn the refrigerator to OFF to measure resistance

of the Evaporator Thermistor.

Disconnect the three pole connector (Figure 6)

Measure resistance (Figure 7).

The Evaporator Thermistor is checked by measur-

ing the temperature and resistance of the Ther-

mistor (Table 1).

Thermister Check-Out

Trouble Shooting - Procedure E

Ω = openThermistor windings. An open

Thermistor will stop compressor operation.

Replace Thermistor.

1.6K - 29K Ω= good Thermistor.

ecnatsiseRrotsimrehTrotaropavE

rotsimrehT

erutarepmeT

F°

ecnatsiseR elbawollA

egnaRecnatsiseR

0K7.9K7.01-K7.8

01K8.7K6.8-K0.7

02K4.6K0.7-K7.5

03K3.5K7.5-K8.4

04K5.4K9.4-K0.4

05K6.3K0.4-K2.3

06K8.2K1.3-K5.2

07K1.2K3.2-K9.1

08K9.1K0.2-K7.1

09K8.1K9.1-K6.1

Trouble Shooting - Procedure F

Trouble Shooting - Procedure G

Trouble Shooting - Procedure H

Overheating Shut-off Device Installation

1. Remove the wire [1] from the upper connection [2] of the

POWER SUPPLY [3] (See Art01324).

2. Attach the SHUT-OFF DEVICE to the refrigerator:

NOTE: On some refrigerator models, remove the screw

from the two (2) upper holes [4] of the POWER SUPPLY

(See Art01324).

- Position the SHUT-OFF DEVICE [5] above the POWER

SUPPLY and align the mounting holes of the SHUT-OFF

DEVICE with the upper holes of the POWER SUPPLY

(See Art01325).

- Put a screw through each mounting hole of the SHUT-OFF

DEVICE, through the POWER SUPPLY and into the back

of the refrigerator.

- Tighten each screw.

3. Connect the SHUT-OFF DEVICE wires to the refrigerator

(See Art01325):

- Push the longer wire [6] of the SHUT-OFF DEVICE onto

the upper connection of the POWER SUPPLY.

- Push the shorter wire [7] of the SHUT-OFF DEVICE onto

the wire [1] that you removed in step #1.

Overheating Shut-off Device Operation

The refrigerator will not restart until the refrigerator is manually

turned off and the air temperature is lower than 110°F.

Operating the refrigerator in high ambient temperatures can

overheat the cooling unit and cause premature failure of the

compressor. (Refer to the label inside the refrigerator.)

To protect the cooling unit from overheating, the refrigerator

will automatically shut-off when the vehicle air temperature is

higher than 110°F. If shut off occurs, an audible alarm tone

(an intermittent beeping) from the refrigerator will sound.

To stop the audible alarm tone and restart the refrigerator, you

must turn the thermostat knob counterclockwise to “OFF”and

then clockwise to the desired setting.

Auto-Shut Off Device

Trouble Shooting Shut-Off Device

WARNING

Do not operate refrigerator with Shut-OFF

Device disconnected. Operating the

refrigator without device may cause

compressor failure.

To determine if Shut-OFF Device is functional,

disconnect the Shut-Off Device from the Temperature

Control. Connect the Temperature Control direct to

power supply. IF refrigerator operates, replace the

Shut-OFF Device. If no operation, replace the

Temperature Control.

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