Dometic RM7732, RM7030 service manual Other

Page 28

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732 Refrigerators

SECTION 9

OTHER

9.1LEVELING

In an absorption refrigerator system, ammonia is liquefied in the finned condenser coil at the top of the refrigerator. The liquid ammonia then flows into the evaporator (inside the freezer section) and is exposed to a circulating flow of hydrogen gas, which causes the ammonia to evaporate, creating a cold condition in the freezer.

The tubing in the evaporator section is specifically sloped to provide a continuous movement of liquid ammonia downward by gravity through this section. If the refrigerator is operated when it is not level and the vehicle is not moving, liquid ammonia will accumulate in sections of the evaporator tubing. This will slow the circulation of hydrogen and ammonia gas, or in severe cases, completely block it, resulting in a loss of cooling.

Any time the vehicle is parked for several hours with the refrigerator operating, the vehicle should be level to prevent this loss of cooling. The vehicle needs to be leveled only so it is comfortable to live in (no notice- able sloping of floors or walls).

When the vehicle is moving, the leveling is not critical as the rolling and pitching motion of the vehicle will pass to either side of level, keeping the liquid ammonia from accumulating in the evaporator tubing.

9.2VENTILATION

Ventilation is one of the requirements for proper cooling unit operation. The coach vent system must be able to provide a way to direct the hot air produced by the action of the cooling unit, out away from the installation of the refrigerator.

0" CLEARANCE FROM SIDE OF CABINET

CLEARANCE

FROM

COMBUSTIBLE

MATERIALS

PATH OF

AIR FLOW

The refrigerator extracts heat from the interior of the refrigerator cabinet and dissipates the heat out through the vent system. In a proper installation there should be

as little open space as possible surrounding the sides and top of the refrigerator to achieve proper air flow. All potential dead air pockets should be blocked or baffled to ensure that heat won't be trapped in these spaces and reduce efficiency.

NOTE: Refrigerators should be installed in accordance with appropriate installation instructions received with the refrigerator.

9.3AIR LEAKS

Check the gasket on the doors to be sure of a positive air seal. A simple method to check gaskets is to close the door on a dollar bill, then pull the dollar bill out. If no resistance is felt, the gasket is not sealing properly. This should be done on all four sides of the door. If a gasket is not sealing properly, first warm the gasket material with a hair drier.

DO NOT OVERHEAT AS YOU CAN MELT THE MATERIAL.

Then close the door and the magnetic strip should pull the gasket to the metal frame. Leave door closed until the material has cooled. Then recheck for a positive seal. If a positive seal cannot be achieved, replace the gasket. Also check that the cooling unit is installed properly. The cooling unit's foam block, the portion that surrounds the evaporator coils, must be flush to the cabinet at the back of the refrigerator and have a positive seal. If the cooling unit is not installed properly, remove and install properly.

RM7030:

The refrigerator is secured in the enclosure with six screws and they must be installed in the following order:

First Two Screws installed on front base; Second Two Screws installed in the top frame; Third Two Screws installed in the rear base.

Failure to follow the sequence in securing refrigerator in

enclosure can

 

cause leakage

 

between the

 

frame and

2ND

cabinet.

 

NOTE: Air

 

leaks will

 

cause insuffi-

3RD

cient cooling

 

as well as

 

rapid forma-

 

tion of frost.

 

 

1ST

25

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Contents Foreword Contents Wiring OtherICE Maker ICE Maker ComponentsSymptom Cause Refer to Step Refrigerator Section RM7030 Refrigerator SectionSymptom Cause Refer to Step C,DSymptom Cause Refer to Step ICE Maker Section AES Fully Automatic Mode LP GAS Delay ModeOperation LP GAS OperationAES Display Panel AES Mode Volts AC Operation Flame Failure During LP GAS OperationLOW Voltage Monitor ThermostatGAS Mode Standby Mode of OperationAuto Mode RM7732 Refrigerator OperationDescription of Operating Modes To Shut OFF the RefrigeratorAC Voltage Requirements Accomponents Heating ElementDC Voltage Requirements DC ComponentsThermistor Thermistor AdjusterSolenoid Valve Igniter High Voltage CableFuses ON-OFF SwitchUpper Circuit Board AES Function Switch AC Mode Lamp and SwitchGAS Function Lamp AES Function LampGAS Mode Lamp and Switch Delay Mode Lamp and SwitchGAS Flame Warning Lamp Diagnostic Mode Lower Circuit BoardRM7030 Product No & RM7732 Door Switch LP GAS Requirements ElectrodeClimate Control Heater Test PortLP GAS Components Manual GASOrifice ThermocoupleWiring Internal WiringBurner Flue BaffleTypical Wiring Diagram for Volts AC RM7732 Typical Wiring Diagram Other Securing the Refrigerator Ambient Temperature Door PositionSmooth FIT, Proper Seal Cooling UnitInterior Liner Seal to Frame ICE Maker Operation ICE Maker ComponentsMold Heater ICE EjectorMold Switches Shutoff ARMTiming Motor Water ValveSchematics on Pages 32 Through ICE Maker AssemblyDometic RM7030/RM7732 Refrigerators Dometic RM7030/RM7732 Refrigerators Water Fill Adjustment ICE Maker OtherICE Maker Typical Wiring Diagram Water Supply

RM7030, RM7732 specifications

The Dometic RM7732 and RM7030 are two innovative refrigeration solutions designed for those who enjoy outdoor adventures such as camping, RVing, and boating. These refrigerators are engineered to provide reliable cooling performance while prioritizing energy efficiency and ease of use.

The Dometic RM7732 is a three-way refrigerator that operates on 12V DC, 110V AC, and propane. Its versatility makes it an ideal choice for those who may not always have access to an electric power source. With a capacity of 7.3 cubic feet, it can hold a substantial amount of food and beverages, making it perfect for extended trips. The RM7732 also boasts an impressive temperature range, allowing it to maintain optimal cooling conditions even in varying outdoor temperatures. Its sleek design includes a reversible door, providing flexibility in installation and use.

On the other hand, the Dometic RM7030 is a double-door refrigerator that combines style with functionality. This model also supports three-way operation: propane, 12V DC, and 110V AC. It offers a slightly smaller capacity than the RM7732 but is still equipped to handle the needs of a small family or group. One of its standout features is its efficient absorption cooling technology, which ensures that the refrigerator operates quietly, making it an excellent choice for nighttime use.

Both models feature an electronic ignition system that simplifies the process of starting the propane function. The intuitive control panel on each unit allows users to easily select the preferred power source and adjust the temperature settings. Energy-efficient LED lighting inside the refrigerators enhances visibility while consuming minimal power.

Dometic has incorporated advanced insulation materials in both the RM7732 and RM7030 to reduce energy consumption, ensuring that food stays cooled even under high ambient temperatures. The sturdy construction is designed to withstand the rigors of outdoor use, and the units are built to last.

In summary, the Dometic RM7732 and RM7030 refrigerators are excellent choices for outdoor enthusiasts seeking reliable, versatile, and energy-efficient cooling solutions. With their range of power options, impressive capacities, and user-friendly features, they are well-equipped to handle the demands of any adventure while keeping your provisions fresh and cool.
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