Dometic RM7030, RM7732 User Manual

Foreword

This service manual is the result of the

dedication of The Dometic Corporation and

its

engineers necessary instruction for making accurate analyses of certain conditions. Provided is a diagnostic chart leading a qualified mechanic into the service manual pages to

locate and solve symptoms which may occur. Dometic has continued its commitment in providing service people with this, the most up-to-date information about servicing Dometic RV accessories.

in giving

service people the

form No. 3 106938.008

2/96

(Replaces OS1 684)

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732

Refrigerators

CONTENTS

PAGE NO.

RM7030/RM7732 DIAGNOSTIC FLOW CHART ........................... 1

SECTION 1

OPERATION

1.1 RM7030 (Prod. #921890201 & 921890301)

Refrigerator Operation .......................................................... 5

1.2 RM7030 (Prod. #921890401) Refrigerator Operation ................ 6

1.3 RM7732 Refrigerator Operation ............................................. 7

SECTION 2

AC VOLTAGE

AC Voltage Requirements ..................................................... 9

SECTION 3

AC COMPONENTS

Heating Element .................................................................. 9

SECTION 4

DC VOLTAGE

DC Voltage Requirements ..................................................... 9

SECTION 5

DC COMPONENTS

5.1 Thermostat: RM7030 (Prod. No. 921890201 & 921890301) ....... 9

5.2 Thermistor: RM7030 (Prod. No. 921890401) & RM7732 .......... 10

5.3 Thermistor Adjuster: RM7030 (Prod.No. 921890401) & RM7732 10

5.4 Solenoid Valve ................................................................... 10

5.5 Igniter ............................................................................... 11

5.6 High Voltage Cable ............................................................ 11

5.7 Fuses ............................................................................... 12

5.8 Upper Circuit Board ............................................................ 12

5.9 Lower Circuit Board ............................................................ 15

5.10 Door Switch....................................................................... 17

5.11 Electrode .......................................................................... 18

5.12 Climate Control Heater ....................................................... 18

SECTION 6

LP GAS

LP Gas Requirements ........................................................ 18

SECTION 7

LP GAS COMPONENTS

7.1 Manual Gas Shutoff Valve ................................................... 19

7.2 Orifice .............................................................................. 20

7.3 Thermocouple ................................................................... 20

7.4 Burner .............................................................................. 21

7.5 Flue Baffle ........................................................................ 21

7.6 Flue Cap (RM7030 Only) .................................................... 21

DOMETIC® RM7030/RM7732 Refrigerators

DIAGNOSTIC SERVICE MANUAL

CONTENTS

SECTION 8

WIRING

8.1 External Wiring .................................................................. 21

8.2 Internal Wiring ................................................................... 21

SECTION 9

OTHER

9.1 Leveling ............................................................................ 25

9.2 Ventilation ......................................................................... 25

9.3 Air Leaks .......................................................................... 25

9.4 Door Position ..................................................................... 27

9.5 Ambient Temperature ......................................................... 27

9.6 Cooling Unit ...................................................................... 27

9.7 Food Storage .................................................................... 27

9.8 High Humidity .................................................................... 27

9.9 Interior Liner Seal to Frame ................................................. 28

SECTION 10

ICE MAKER

Ice Maker Operation ........................................................... 29

PAGE NO.

SECTION 11

ICE MAKER COMPONENTS

11.1 Mold Heater ...................................................................... 29

11.2 Ice Ejector......................................................................... 29

11.3 Mold Thermostat ................................................................ 29

11.4 Shutoff Arm ....................................................................... 30

11.5 Mold Switches ................................................................... 30

11.6 Timing Motor ..................................................................... 30

11.7 Water Valve ...................................................................... 30

11.8 Ice Maker Assembly ........................................................... 31

SECTION 12

ICE MAKER  OTHER

12.1 Water Fill Adjustment.......................................................... 34

12.2 Wiring ............................................................................... 35

12.3 Water Supply ..................................................................... 35

DIAGNOSTIC SERVICE MANUAL

Diagnostic Service Manuals

DOMETIC® RM7030/RM7732

Refrigerators

This program will address the most common system problems associated with the Dometic RM7030/RM7732 refrigerators supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms.

RM7030 REFRIGERATOR SECTION: Product No. 921890201 & 921890301 SYMPTOM CAUSE REFER TO STEP

REFRIGERATOR SECTION

1. No operation  no panel lights

2. No operation  has panel lights

3. Operating OK  no panel lights

4. No AC operation  operates on gas

Operation 1.1 A DC Volts 4A Fuse 5.7 A Wiring 8.1, 8.2 Upper Circuit Board 5.8 A Lower Circuit Board 5.9 A ,D

Operation 1.1 A Thermostat 5.1 Upper Circuit Board 5.8 A Solenoid 5.4 A Wiring 8.2 Lower Circuit Board 5.9 B,C,D

DC Volts 4A Wiring 8.2 Upper Circuit Board 5.8 B through I Lower Circuit Board 5.9 D

Operation 1.1 A AC Volts 2 Heating Element 3 Upper Circuit Board 5.8 B,C Wiring 8.2 Thermostat 5.1 Lower Circuit Board 5.9 B

5. No Gas operation  operates on AC

6. Insufficient cooling on all modes.

7. Insufficient cooling on AC  cools properly on gas.

Operation 1.1 A LP Gas 6 Manual Gas Valve 7.1 Igniter 5.5 A High Voltage Cable 5.6 A Electrode 5.11 Solenoid 5.4 A Upper Circuit Board 5.8 B,D,E Wiring 8.2 Lower Circuit Board 5.9 C

Ventilation 9.2 Leveling 9.1 Ambient Temperature 9.5 Air Leaks 9.3 Thermostat 5.1 Cooling Unit 9.6

AC Volts 2 Heating Element 3

DOMETIC® RM7030/RM7732 Refrigerators

DIAGNOSTIC SERVICE MANUAL

SYMPTOM CAUSE REFER TO STEP

8. Insufficient cooling on gas  cools properly on AC.

9. Freezes on all modes.

10. Changes preset mode.

11. Flame failure light within 10 seconds.

12. Flame failure light after 3 minutes.

LP Gas 6 Orifice 7.2 Flue Baffle 7.5 Flue Tube 7.7 Flue Cap 7.6 Burner 7.4

Thermostat 5.1 DC volts 4A

DC Volts 4A Wiring 8.1 Lower Circuit Board 5.9 A,B,C,D

Igniter 5.5 A High Voltage Cable 5.6 A Electrode 5.11 Wiring 8.2

LP Gas 6 Manual Gas Valve 7.1 Solenoid 5.4 A Orifice 7.2 Burner 7.4 Wiring 8.2 Thermocouple 7.3 A

13. Interior light ON when door is closed.

14. Rapid formation of frost.

15. Water on frame.

RM7030 (Prod. No. 921890401) & RM7732

16. No operation  no panel lights

17. No operation  has panel lights

Wiring 8.2 Door Switch 5.10 Door Position 9.4

Food Storage 9.7 Interior Liner to Frame 9.9 High Humidity 9.8 Air Leaks 9.3

Interior Liner to Frame 9.9 High Humidity 9.8 Air Leaks 9.3 Climate Control Heater 5.12

Operation 1.1B or 1.2 DC Volts 4B Fuse 5.7 B Wiring 8.1 & 8.2 Upper Circuit Board 5.8 J Lower Circuit Board 5.9 E

Operation 1.1B or 1.2 DC volts 4B Thermistor 5.2 Fuses 5.7 B Upper Circuit Board 5.8 J Wiring 8.2 Lower Circuit Board 5.9 E,F,G

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732

Refrigerators

SYMPTOM CAUSE REFER TO STEP

18. No AC operation  operates on gas.

19. No gas operation  operates on AC

20. Insufficient cooling on all modes.

Operation 1.1B or 1.2 AC Volts 2 Fuse 5.7 B Heating Element 3 Upper Circuit Board 5.8 J Wiring 8.2 Lower Circuit Board 5.9 E,F

Operation 1.1B or 1.2 LP gas 6 Manual Gas Valve 7.1 Igniter 5.5 B High Voltage Cable 5.6 B Electrode 5.11 Solenoid 5.4 B Upper Circuit Board 5.8 J Wiring 8.2 Lower Circuit Board 5.9 E,G

Ventilation 9.2 Leveling 9.1 Ambient Temperature 9.5 Air Leaks 9.3 Thermistor 5.2 Cooling Unit 9.6 Thermistor Adjuster 5.3

21. Insufficient cooling on AC  cools properly on gas.

22. Insufficient cooling on gas  cools properly on AC.

23. Freezes.

24. Changes preset mode.

25. Check light on.

AC Volts 2 Heating Element 3 Lower Circuit Board 5.9 E,F

LP Gas 6 Orifice 7.2 Flue Baffle 7.5 Flue Tube 7.7 Flue Cap (RM7030 Only) 7.6 Burner 7.4 Lower Circuit Board 5.9 E,G

Thermistor 5.2 Thermistor Adjuster 5.3 Lower Circuit board 5.9 E,F,G Upper Circuit Board 5.8 J

Operation 1.1B or 1.2 DC Volts 4B Wiring 8.1 Upper Circuit Board 5.8 J Lower Circuit Board 5.9 E

DC Volts 4 Wiring 8.2 LP Gas 6 Manual Gas Valve 7.1 Solenoid 5.4 B Orifice 7.2 Burner 7.4 Lower Circuit Board 5.9 E,G Thermocouple 7.3 B

DOMETIC® RM7030/RM7732 Refrigerators

DIAGNOSTIC SERVICE MANUAL

SYMPTOM CAUSE REFER TO STEP

26. Interior light on when door is closed.

27. Rapid formation of frost.

28. Water on frame.

ICE MAKER SECTION

29. Ice Maker fails to start.

30. Ice Maker won't make ice.

Wiring 8.2 Door Switch 5.10 Door Position 9.4

Food Storage 9.7 Interior Liner to Frame 9.9 High Humidity 9.8 Air Leaks 9.3

Interior Liner to Frame 9.9 High Humidity 9.8 Air leaks 9.3 Climate Control Heater 5.12

Operation 10 Arm in UP Position 11.4 AC Voltage 2 Water Valve 11.7 Ice Maker Cycle 11.8

Blades frozen in ice 12.1 AC Voltage 2 Water Valve 11.7 Ice Maker Cycle 11.8

31. Keeps making ice and won't shut off.

32. Not making enough ice.

33. Too much water is coming out.

34. Ejector blade frozen into ice cubes.

35. Unit is hooked-up  no water comes in.

36. Ice maker is running but won't make cubes.

37. Ice maker will not eject ice.

Shutoff Arm 11.4

Operation 10 Mold Thermostat 11.3 Cube Size 12.1 Ice Maker Cycle 11.8

Water Fill Adjustment 12.1 Water Valve 11.7

Water Supply 12.3 Water Valve 11.7

Water Supply 12.3 Shutoff Arm 11.4 Mold thermostat 11.3 Hold Switch 11.5

Ice Ejector 11.2 Mold Heater 11.1 Timing Motor 11.6

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732

Refrigerators

SECTION 1

1.1 OPERATION RM7030 (Product No. 921890201 & 921890301)

OFF

AES FULLY AUTOMATIC MODE

Turn switch "C" to the "ON" position. The bulb above push-button "A" will light up green, indicating that the control system is in the fully automatic mode. In this mode, 120 volts AC operation has first priority, meaning the refrigerator will operate on 120 volts AC whenever it is available. If 120 volts AC is not available, the system will automatically switch to LP gas operation. The thermostat inside the refrigerator cabinet cycles the element/burner as required to maintain the desired temperature.

NOTE: The AES controls will automatically go to the fully automatic mode each time switch "C" is turned "ON".

LP GAS OPERATION

When there is no electrical power available (120 volts AC) or if the indicator lamp above button "B" is ON, the AES system will switch to LP gas operation. When the thermostat in the refrigerator cabinet calls for cooling, the following sequence takes place: A. A high voltage spark is created above the burner. B. Power is sent to a solenoid which opens the gas

control, allowing LP gas to flow to the burner. The

spark ignites the LP gas and the small flame pro-

vides heat for the boiler. C. The electrode mounted above the burner tube

monitors the flame continuously. If the flame should

fail for any reason, the high voltage spark will start

immediately and relight the flame.

When the thermostat reaches the desired temperature, it will shut off the gas flame completely. The system will remain on standby until cooling is again required.

LP GAS ONLY OPERATION

Turn switch "C" to the "ON" position and press push- button "B". The green indicator lamp over push-button "B" will come on and the refrigerator will operate only on LP gas even if 120 volts are available. When the vehicle engine is turned "OFF", the AES system initiates a 25 minute delay, preventing the refrigerator from operating on LP gas.

LP GAS DELAY MODE

When the vehicle engine is turned off, the AES system initiates a delay cycle which prevents the refrigerator from operating on LP gas for 25 minutes. The purpose of the delay is to avoid having a gas flame burning during a refueling stop at a gas station (see WARNING).

If the vehicle engine is restarted during this delay period, the LP gas operation will not start until the delay period is over. This means each time the vehicle engine is stopped, the complete 25 minute delay cycle will take place. If 120 volt AC becomes available during this delay cycle, the AES system will start operation in the 120 volt AC mode immediately, unless the push-button "B" (LP gas only) has been pressed.

If the RV is stopped somewhere other than a gas station, you may wish to cancel the delay cycle. To do this, turn the main system switch to "OFF" for several seconds, then turn the main system switch back to "ON" and the system will immediately start operation in the LP gas mode.

Most LP gas appliances used in recreational vehicles are vented to the outside of the vehicle. When parked close to a gasoline pump, it is possible that the gasoline fumes could enter this type of appliance and ignite from the burner flame, CAUSING A FIRE OR AN EXPLOSION.

FOR YOUR SAFETY, it is recommended that all LP gas appliances which are vented to the outside should be shut off when refueling.

The AES system is designed to turn off the LP flame during refueling stops by the use of the delay cycle explained previously. However, you must remember that the delay cycle will be activated only if the refrigerator is properly connected to the vehicle engine electrical circuit.

If the refrigerator is not connected to the engine by the ignition lock wiring, the refrigerator must be shut off during refueling. To do this, turn the main system switch "C" to "OFF". Only after the vehicle has been moved away from the refueling area should the main system switch "C" be turned back ON.

DOMETIC® RM7030/RM7732 Refrigerators

DIAGNOSTIC SERVICE MANUAL

FLAME FAILURE DURING LP GAS OPERATION

If the LP gas flame fails during the burner cycle, the high voltage spark will continue arcing for up to three minutes.

At the end of three minutes the gas control will stop the flow of LP gas to the burner, the sparking will stop and the red indicator lamp "H" will light up. LP gas operation will not be possible as long as this indicator is ON.

To restart LP gas operation, turn the main system switch "C" to "OFF" for five seconds and then back ON. This will reset the AES controls and turn off the flame failure indicator "H". The system will start another cycle for gas ignition.

If repeated attempts fail to start the LP gas operation, check to make sure that the LP gas supply tanks are not empty and all manual Shutoff valves in the lines are open.

NOTE: If you are in the AES mode when the flame failure light "H" comes on, the mode indicator lamp "A" (green light) will go out. If 120 volt AC power becomes available during this period, the mode indication lamp will come on showing that the refrigerator is operating on another energy source. The red lamp "H" will remain on until the AES system is reset with an OFF/ON operation of the main switch "C". If you have selected the LP gas only mode (control button "B"), the 120 volt function has been locked out. If the burner fails to light, the green lamp over button "B" will go out and the red lamp "H" will glow indicating flame failure. Even if 120 volts is available, the refrigerator cannot switch to electric operation and all cooling will stop. This fact must be considered when selecting "gas only" operation.

120 VOLTS AC OPERATION

Since 120 volt AC is usually the most economical source for operation of the refrigerator, the AES control system is designed to select this mode whenever it is available. The only exception to this is when pushbutton "B" (LP gas only mode) is selected. The 120 volt heating elements attached to the boiler provide the heat necessary to operate the cooling system. The thermostat controls the power ON and OFF to the elements and maintains the desired temperature.

LOW VOLTAGE MONITOR

The AES system requires 12 volts DC power at all times to operate properly. The DC power must be 9.5 volts DC or higher. If the DC voltage drops below 9.5 volts DC, the AES system will switch to an emergency cooling mode.

1. The mode indicator lamp will go off (green light);

2. The system will revert to continuous LP gas operation, with no thermostat control.

The refrigerator will continue to operate in the emergency mode until the DC power supply is increased to

10.5 volts DC. When 10.5 volts is reached, the mode indicator light (green) will come back on and normal operation will resume.

During the low voltage condition, the interior light will operate normally.

THERMOSTAT

The refrigerator is equipped with a thermostat that can be adjusted to maintain various temperatures. Turn the knob clockwise toward "MAX" for a lower temperature and for a warmer temperature  turn the knob counterclockwise toward "MIN". Set the thermostat approximately mid-range and adjust it toward "MIN" or MAX" to obtain the desired cabinet temperatures. Remember, at the "MAX" setting, the heating element/burner is running continuously and the lower cabinet temperatures are obtained.

1.2 RM7030 (Product No. 921890401)

AES DISPLAY PANEL

AES MODE

1. Move the AES mode selector button (2) to the DOWN position. If 120 volts AC is available, the AC mode indicator lamp "A" will illuminate indicating AC operation. If 120 volts AC is not available, the GAS mode indicator lamp "C" will illuminate and the control system will automatically switch to GAS operation.

2. If the CHECK indicator lamp "D" illuminates and the GAS mode indicator lamp "C" is off, the controls have failed to ignite the burner in the GAS mode. GAS operation may be reset by pressing main power ON/OFF button (1) to the OFF then ON position.

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732

Refrigerators

3. Press the TEMPERATURE SELECTOR button (3) until the lamp at the desired position is illuminated.

4. When operating in the AES mode, the AES mode indicator lamp "B" will illuminate. The control system will automatically select between AC and GAS operation with AC having priority over GAS. Either the AC indicator lamp "A" or the GAS indicator lamp "C" will illuminate depending on the energy source selected by the control system. If the control system is operating with AC energy and it then becomes unavailable, the system will automatically switch to GAS. As soon as AC becomes available again, the control will switch back to AC regardless of the status of GAS operation.

GAS MODE

1. Move the AES mode selector button (2) to the UP position. The GAS mode indicator lamp "C will illuminate. After 45 seconds the burner should be ignited and operating normally.

2. On the initial refrigerator start-up, it may take longer than 45 seconds to allow air to be purged from the gas line. If the gas does not ignite within 45 seconds, the CHECK indicator lamp "D" will illuminate and the GAS mode indicator lamp "C" will go off. To reset when the CHECK indicator lamp "D" is illuminated, press the main power ON/OFF button (1) to the OFF then ON position.

If the control is switched to AC operation while the CHECK indicator lamp is on, it will function properly, but the CHECK indicator lamp will not go off until the main power ON/OFF button is pressed to the OFF then ON position. NOTE: Do not continue to reset GAS operation if the CHECK indicator lamp continues to be illuminated after several tries. If repeated attempts fail to start the LP gas operation, check to make sure that the LP gas supply tanks are not empty and all manual shutoff valves in the lines are open.

3. Press the TEMPERATURE SELECTOR button (3) until the lamp at the desired position is illuminated.

THERMOSTAT

The thermostat on the refrigerator controls both the gas and electric operation, thereby eliminating the necessity of resetting each time a different energy source is employed.

After the initial start-up, the thermostat should be moved from "COLDEST" to the desired temperature setting, usually about mid-setting.

If for some reason the display module becomes nonfunctional, the control system will revert to fully automatic operation  selecting the best energy source available with AC and GAS priority. The temperature of the refrigerator will be maintained at the MID position within normal temperature tolerances. The power module will continually attempt to reestablish operation of the display module.

The second standby mode of operation will execute when a failure of the temperature sensing device or associated electronic circuitry occurs. If this should occur, the control system will operate on the energy source selected via the control panel. The cooling unit will run continuously on the selected energy source. The refrigerator will continue to operate in this mode indefinitely or until a new sensor is installed and the system is reset.

1.3 RM7732 REFRIGERATOR OPERATION

2-WAY DISPLAY PANEL

AUTO MODE

Press the AUTO mode selector button (2) to the DOWN position. If 120 volts AC is available, the AC mode indicator lamp (A) will illuminate indicating AC operation. If 120 volts AC is not available, the GAS mode indicator lamp (C) will illuminate and the control system will automatically switch to GAS operation.

If the CHECK indicator lamp (D) illuminates and the GAS mode indicator lamp (C) is OFF, the controls have failed to ignite the burner in the GAS mode. GAS operation may be reset by pressing the main power ON/ OFF button (1) to the OFF then ON position. (See GAS MODE.

Press the TEMPERATURE SELECTOR button (3) until the lamp at the desired position is illuminated.

STANDBY MODE OF OPERATION

This control system contains a feature where it will continue to operate the cooling system in the event of a failure of a major operating component. Two different modes of operation can occur in this category.

DOMETIC® RM7030/RM7732 Refrigerators

DIAGNOSTIC SERVICE MANUAL

GAS MODE

Move the AUTO mode selector button (2) to the UP position. The GAS mode indicator lamp (C) will illuminate. After 45 seconds the burner should be ignited and operating normally.

On the initial refrigerator start-up, it may take longer than 45 seconds to allow air to be purged from the gas line. If the gas does not ignite within 45 seconds, the CHECK indicator lamp (D) will illuminate and the GAS mode indicator lamp (C) will go off. To reset when the CHECK indicator lamp (D) is illuminated, press main power ON/OFF button (1) to the OFF then ON position.

NOTE: DO NOT continue to reset GAS operation if the CHECK indicator lamp continues to be illuminated after several tries.

Press the TEMPERATURE SELECTOR button (3) until the lamp (E) at the desired position is illuminated.

THERMOSTAT

The thermostat on the refrigerator controls both the gas and electric operation, thereby eliminating the necessity of resetting each time a different energy source is employed.

After the initial start-up, the thermostat should be moved from "COLDEST" to the desired temperature setting is usually about mid-setting.

GAS MODE

When operating in the GAS mode, the AUTO mode indicator lamp (B) will be off and the GAS mode indicator lamp (C) will be illuminated. This mode provides LP gas operation only. The control system will activate the ignition system and will attempt to light the burner for a period of approximately 45 seconds. If unsuccessful, the CHECK indicator lamp (D) will illuminate and the GAS mode indicator lamp (C) will turn off.

To restart GAS operation, press the main power ON/ OFF button (1) to the OFF and then ON position. The control system will attempt a new 45 second ignition sequence.

If the refrigerator has not been used for a long time or the LP tanks have just been refilled, air may be trapped in the supply lines. To purge the air from the lines may require resetting the main power ON/OFF button (1) three or four times. If repeated attempts fail to start the LP gas operation, check to make sure that the LP gas supply tanks are not empty and all manual shutoff valves in the lines are open.

If the control is switched to AC or DC operation while the CHECK indicator lamp is on, it will function properly, but the CHECK indicator lamp will not go off until the main power ON/OFF button is pressed to the OFF then ON position.

TO SHUT OFF THE REFRIGERATOR

The refrigerator may be shut off while in any mode of operation by pressing the main power ON/OFF button (1) to the UP (OFF) position. This shuts off all DC power to the refrigerator, including the interior light.

DESCRIPTION OF OPERATING MODES

AUTO MODE

When operating in the AUTO mode, the AUTO mode indicator lamp (B) will illuminate. The control system will automatically select between AC and GAS operation with AC having priority over GAS. Either the AC indicator lamp (A) or the GAS indicator lamp (C) will illuminate depending on the energy source selected by the control system. If the control system is operating with AC energy and it then becomes unavailable, the system will automatically switch to GAS. As soon as AC becomes available again, the control will switch back to AC regardless of the status of GAS operation.

STANDBY MODE OF OPERATION

If for some reason the display module becomes nonfunctional, the control system will revert to full automatic operation selecting the best energy source available with AC as first priority, and GAS as the second priority. The temperature of the refrigerator will be maintained at the MID position within normal temperature tolerances. The power module will continually attempt to reestablish operation of the display module.

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732

Refrigerators

SECTION 2

AC VOLTAGE REQUIREMENTS

The refrigerator is a 120 volt AC, 60 Hz appliance. The proper operating range is 100 to 132 volts. Check the AC volts at the receptacle where the refrigerator is attached. If voltage is outside of the proper operating range, correct the power source problem.

On RM7030 (Product No. 921890401) and RM7732, if voltage drops below 100 volts, cooling efficiency will decrease with voltage decrease. The refrigerator will not switch to another mode of operation until all AC power

is lost.

SECTION 3

AC COMPONENTS HEATING ELEMENT

The heating element is designed to deliver a predetermined amount of heat to the cooling unit. To check a heating element, remove the heater leads from the printed circuit board and measure for proper resistance across the two leads with a properly calibrated ohm meter. This check is to be done with the heating element at room temperature. The proper ohms for each of the two RM7030 and RM7732 heating elements is 69, with a tolerance of ten percent. If the resistance is outside the tolerance range, replace the heating element.

terminals at the back of the refrigerator. If power is outside the operational range, correct the power supply problem. The power supply to the refrigerator must be fused. Maximum fuse size: 5 amps.

With the refrigerator operating on AC or gas mode, if voltage to the refrigerator slowly drops to or below 9.5 volts DC, the gas flame will come on and will not be thermostatically controlled. Low DC volts (below 9.5) could cause over-cooling.

B. RM7030 (Prod. No. 921890401) & RM7732

For the refrigerator to operate on any mode, DC voltage must be supplied to the terminals at the rear of the refrigerator.

The operational range of the unit is a minimum of 9.6V DC to a maximum of 22V DC. The unit will automatically shut down until voltage has decreased to 18V DC. The refrigerator requires at least 9.6V DC for proper operation; however, the panel lights will continue to illuminate until voltage has dropped to 4V DC or below.

Connecting the refrigerator to an unregulated converter can result in improper operation of the refrigerator. Do not use the body or chassis of the RV as a substitute for either of the two conductors. Proper polarity is crucial for refrigerator operation. Check for proper DC voltage at the positive and negative terminals at the back of the unit. If the voltage is outside the operational range, correct the power supply problem.

SECTION 5

SECTION 4

DC VOLTAGE REQUIREMENTS

A. RM7030 (Product No. 921890201 &

921890301)

For the refrigerator to operate on any mode, DC voltage must be supplied to the terminals at the rear of the refrigerator and must be connected directly to the battery of the RV. The operational range is 10.5 to 15 volts DC. Connecting the refrigerator to an unregulated converter can result in improper operation of the refrigerator. Do not use the body or chassis of the RV as a substitute for either of the two conductors. Proper polarity is crucial for the operation of the refrigerator. Check for proper voltage at the positive and negative

DC COMPONENTS

5.1 THERMOSTAT RM7030 (Product No. 921890201 & 921890301)

The thermostat operates on DC volts and regulates the inside refrigerator temperature on all modes, by making and breaking the circuit to the printed circuit board. The internal mechanism breaks contact (continuity) when adequate cabinet temperature has been reached. Check the thermostat for continuity. This check should be made at room temperature with the thermostat turned all the way to MAX. Another check would be to use a jumper wire with insulated clips and bypass the thermostat.

NOTE: Use care when doing this test. Do not short to thermostat casing. Also remove jumper after testing is completed.

If the above test allows the refrigerator to operate and/ or the continuity test proves the thermostat to be defective, replace the thermostat. A defective thermostat would cause insufficient cooling, no cooling or freezing on all modes.

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