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

In order to save money and keep your 6 cubic foot Dometic RV fridge safe, the Fridge Defend by ARP should be installed. This page shows the installation for the models listed above.

REQUIRED TO DOWNLOAD INSTALLATION INSTRUCTIONS - WEB PAGES ARE SUPPLEMENTAL - EACH VERSION OF CONTROL HAS INTRICACIES REQUIRING THE WRITTEN INSTRUCTIONS.

Table of Contents

Instructions: Subjects are listed on left. Click the link to the right to go directly to the subject matter on this page.


Dometi Cooling Unit with ARP Control

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.

Click here to see how the ARP helps prevent fires while improving reliability and efficiency.

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 :)


Amish Cooling Unit with ARP Control RTD Sensor

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.


RV Cooling Unit Wiring

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.


DM2662 Condenser

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.


Wiring ARP Control on 6 and 7 Cubic Foot Dometic Fridge

RM2607; RM2611; RM2612; RM3604; RM3607; RM3662 (Early 2-Way)

Please click here for the details of wiring the 2-way models without the boiler thermal switch recall.

RM2652; DM2652; RM2662; DM2662; DM2682 (Late 2-Way with Recall)

Click here if your fridge has a boiler thermal switch that is wired in line with the power supply.

RM2607; RM2611; RM2612; RM2653; RM2663; RM3604; RM3607; RM3663 (Early 3-Way Models)

For the early 3-way models where all of the current is routed through the power supply to the fridge control. The ARP can not power the 3-way heater and a relay is required.

DM2663; DM3683 (Late 3-Way Models)

For the newer 3-way models that have a relay controlling the 12VDC heater, please click here for further details.

ARP Fan Install

Please click here for the ARP blower fan and temperature sensor installation.

Please see the full ARP User Manual and Installation Guide for more information needed before using your ARPrv Control.

Please click here an install on a Winnebago Micro Minnie with a DM2652RBX.

Dometic Service Manual Repair Specifications

Please note that all of the following specifications are believed to be accurate. If any errors are found, please bring them to our attention as soon as possible. For critical specification please contact Dometic as they make changes to their specifications without notice.

FRIDGE MODEL: RM2607; RM2611; RM2612; RM3604; RM3607

Parameter Value
Fridge Defend Boiler Temperature 185-195 °C
Fan Control Absorber Coil Temperature 120-135 °F
Off-Level Operating Limit Click Here
Minimum DC Power Supply 9.6 VDC
Maximum DC Power Supply 22 VDC
Maximum AC on 12VDC Supply Line 6 VAC
Board 12VDC Fuse 3 A
Board AC Fuse 5 A
VAC Operating Range 100-132 VAC
DC Heater Power Rating 215 W
DC Current 18 A
DC Heater Resistance per Heater (cold) 0.67 Ohm
DC Fuse 30 A
AC Heater Power Rating 295 W
Current 2.5 A
Heater Resistance per Heater (cold) 48 Ohm
Gas Pressure 10.5-11.5 Inch-H2O
Gas Jet #53
Gas Thermocouple 25-35 mVDC
Electrode to Burner Gap 3/16 inch
Please click here for more information on Dometic thermistor troubleshooting.

FRIDGE MODEL: RM2652; RM2662; RM2663; RM3662; RM3663;

Parameter Value
Fridge Defend Boiler Temperature 185-195 degC
Fan Control Absorber Coil Temperature 120-135 degF
Off-Level Operating Limit Click Here
Minimum DC Power Supply 9.6 VDC
Maximum DC Power Supply 22 VDC
Maximum AC on 12VDC Supply Line 6 VAC
Board 12VDC Fuse 3 A
Board AC Fuse 5 A
VAC Operating Range 100-132 VAC
DC Heater Power Rating 215 W
DC Current 18 A
DC Heater Resistance per Heater (cold) 0.67 Ohm
DC Fuse 30 A
AC Heater Power Rating 295 W
Current 2.7 A
Heater Resistance per Heater (cold) 44 Ohm
Gas Pressure 10.5-11.5 Inch-H2O
Gas Jet #58
Gas Thermocouple 25-35 mVDC
Electrode to Burner Gap 3/16 inch
Please click here for more information on Dometic thermistor troubleshooting.

Dometic Service Manual Downloads

Service Manual Download: RM2652, DM2652, RM2662, DM2662 RM2663, DM2663.

Service Manual Download: RM2607, RM2611, RM2612, RM3604, RM3607, RM3662, RM3663

Service Manual Download RM2604 (manual control).

Service Manual Download: RM72620, RM2820

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