RM2352 • RM2353 • RM2452 • RM2453 • RM2552 • RM2553

The Fridge Defend by ARP helps keep your Dometic reliable while increasing safety and efficiency This is the install page for the 3, 4, & 5 cubic foot series of manual control Dometic fridge.


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.

Dometic 3, 4, & 5 Cubic Foot Manual Control RV Refrigerators

The Dometic 3, 4, & 5 cuft fridges are very efficient as long as the cooling unit boiler is not allowed to overheat. The problem with these refrigerators is that they are mostly found in slide-in campers, class-b, and other everyday driver type RV conversions. As a result there is a high failure rate due to off-level use and other factors associated with everyday driving that destroys the cooling unit. These refrigerators have the controls on top of the fridge, thus the fridge needs to be moved out to access the top controls.  In addition, a relay and thermocouple adaptor are required, these parts are not provided with the standard Fridge Defend kits.

Please click here to see how the ARP Control can make your Dometic safer, more reliable, & efficient.

Wiring Diagrams

RM2353; RM2453; or RM2553 3-Way

For the 3-way models that have relay #6. please click here for further details.

ARP Boiler Sensor Install

Click here for temperature sensor install video.

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.

ARP RM2353 RM2453 Wiring

Interrupt Adapter Top Mount Manual Controls

RM2352; RM2353; RM2452: RM2453: RM2552: RM2553

For the manual type control where one has to hold down a button and ignite the LP gas, the Norcold part number 621737 thermocouple interrupt adaptor is required. This photo is an RM2353 with the interrupt adaptor installed and wired to a relay which is controlled by the ARP Control.

Adaptor Wiring

This drawing shows how the Norcold Part Number 621737 and Tyco Relay Part Number 0-1432793 are combined to turn off the LP Gas in the event that the boiler overheats. The interrupt adaptor is inserted between the thermocouple and the gas safety valve as seen in the photo above. Keep the orange and blue wires, as seen in this drawing, as short as possible, that is mount the relay as close as it can to the interrupt adaptor. Also, use as heavy gauge wire as practical for the the orange and blue wires. This circuit is very low voltage, thus any resistance can result in issues.

Click here for interrupt adapter wiring details.

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: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
ARP Control Boiler Temperature 170-180 170-180 170-180 Celsius
Off-Level Operating Limit dependent on ambient and ARP boiler temp.
Minimum DC Power Supply 9.6 9.6 9.6 VDC
Maximum DC Power Supply 22 22 22 VDC
Maximum AC on 12VDC Supply Line 6 6 6 VAC


FRIDGE MODEL: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
Board AC Fuse 5 5 5 Amp
Board 12VDC Fuse 3 5 3 Amp

AC Power

FRIDGE MODEL: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
Operating Range 100-132 100-132 VAC

DC Heaters

FRIDGE MODEL: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
DC Heater Power Rating 150 175 175 Watts
Current 12.5 15 15 Amps
Heater Resistance per Heater (cold)0.96 0.8 0.8 Ohms
Fuse 30 30 30 Amps

AC Heaters

FRIDGE MODEL: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
AC Heater Power Rating 175 210 210 Watts
Current 1.5 1.8 1.8 Amps
Heater Resistance per Heater (cold) 80 67 67 Ohms

LP Gas

FRIDGE MODEL: RM2352; RM2353 RM2452; RM2453 RM2552; RM2553 Units
Gas Pressure 10.5-11.5 10.5-11.5 10.5-11.5 inch w.c.
Gas Jet #39 #43 #43
Gas Thermocouple 25-35 25-35 25-35 mili-Volts
Electrode to Burner Gap 3/16 3/16 3/16 inch
Please click here for more information on Dometic thermistor troubleshooting.

Dometic Service Manual Downloads

Service Manual Download: RM2452, RM2453, RM2552, RM2553

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