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 allAC power is lost.

SECTION 3

ACCOMPONENTS–

HEATING ELEMENT

The heating element is designed to deliver a predeter- mined 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 ele- ment 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 ele- ment.

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 refrig- erator. 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

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 opera- tion; 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

DC COMPONENTS

5.1THERMOSTAT

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 thermo- stat would cause insufficient cooling, no cooling or freezing on all modes.

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Dometic RM7732 AC Voltage Requirements, Accomponents Heating Element, DC Voltage Requirements, DC Components, Section
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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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