DM2652 • DM2662 • DM2663 • DM2672 • DM2682 • DM2683 • RM2607 • RM2611 • RM2612 • RM2620 • RM2652 • RM2662 • RM2663 • RM3604 • RM3607 • RM3662 • RM3663

Dometic DM & RM 6 Cubic Foot Cooling Units

The Dometic's 6 cubic foot model  refrigerators are very efficient for Class-B, Slide-In Campers, and Travel Trailers. The issue with all of the aforesaid RVs is that they see a lot of tilting during everyday driving, thus many of these fridges have a short life. With the Fridge Defend by ARP, one can use their RV as an everyday driver and not worry about damaging the fridge by parking off-level.  We own both a DM2652 and a 22 year old RM3663.

The Fridge Defend is a necessity to keep these fridges safe, reliable, and efficient.

The cooling unit to the left is our demo cooling unit that we bought new for testing the Dometic refrigerators while developing the Fridge Defend control. This cooling unit has been tilted off-level for the purpose of testing over 600 times as of the year 2018, and the count is climbing! The cooling unit was tested for performance when it was brand new, and it has been tested every year since, it runs the same as the day it was new!

This cooling unit has gone from Montana at 10,000 feet of elevation to the Salton Sea at 200 feet below sea level. It has been from 20 degrees F to 110 degrees F operating conditions. Needless to say, we have spent so much time with this cooling unit, we consider it a friend :)

Install Boiler Sensor

The photo to the left is an Amish cooling unit in a DM2652. This temperature sensor (RTD) photo shows the sensor in the correct position. Note that the red arrow points at the flue tube, the flue tube is the first tube you will see when opening the boiler housing. The green arrow points at the boiler tube, where the temperature probe is to be installed. The yellow arrow shows the wire coming off of the temperature probe away from the boiler tube so that insulation can be placed between the wire and the boiler and flue tubes. Please note also the direction of the temperature probe clip, it must face away from the flue tube.

WARNING: The temperature sensor must not be on or touching the flue tube, this will void the Fridge Defend temperature sensor warranty. Insulation must be placed between the flue tube and the temperature sensor.

ARP Boiler Sensor Install

Click here for temperature sensor install video.

Control Location

This drawing shows the typical location to mount the Fridge Defend control box. Because the Fridge Defend is automatic once setup, we recommend mounting the controller in the cooling unit compartment. The controller shown has been mounted on the Dometic refrigerator controller housing, please see information below for wiring information.

Identify Helium Charged Units

To the left is the condenser of a DM2663, this is the configuration of the DM and RM series cooling units which use helium. Helium has a narrower effective operation range and requires the Fridge Defend Fan Controller and Blowers for efficient operation. The ARP Fan Control is a must if your evaporator looks like this example.