RM 8401 • RML 8401 • RMS 8401 • RM 8405 • RML 8405 • RMS 8405 •
RM 8501 • RMD 8501 • RML 8501 • RMS 8501 • RM 8505 • RMD 8505 • RMF 8505 • RML 8505 • RMS 8505 •
RM 8551 • RMD 8551 • RML 8551 • RMS 8551 • RM 8555 • RMD 8555 • RML 8555 • RMS 8555

In order to keep your Dometic 8 series fridge reliable, safe, and efficient the installation of the Fridge Defend is required. This series of RV fridge requires the Fridge Defend + Fan Control to remain cool in hot weather.

Testimonial

I’ve been on the road for a week since I installed the Fridge Defend on my Dometic RML8555, the performance of the fridge is significantly improved. We have driven across the hot and humid south from San Antonio to Atlanta and we are holding 3 degrees in the freezer and 33 degrees in the fridge. I am a big fan of the inside and outside fans ... they are making a difference and do not kill my battery like the other noisy fan I had.

Thanks for the improved efficiency and safety! M Schwarz

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.


RML8555 Cooling Unit

About Dometic 8 Series

The Dometic 8 Series of refrigerator are used in Class-B and Class-C type RVs. For example, the RML8555 is found in Winnebago VIA Class-C. Due to the side-vent arrangement on these types of RV the Fridge Defend + Fan Control is a must to keep these RV refrigerators working in hot weather.

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

Description of Model Number

The figure to the left is a cooling unit for a Dometic RMw 8xyz, where the lower case letters are defined for the models in the following manner:

w: This value can take on the following letters; S= housing with step; T= TecTower; D= large; O= single door fridge with oven.

8: Dometic 8 series RV fridge.

x: 4= 486mm width; 5= 535mm width.

y: 0= standard depth; 5= 55mm depth; 6= 65mm depth.

z: 0= Manual Control; 1= Automatic Control (MES = manual energy select); 5= Automatic Control (AES = automatic energy select).


RML8555 Wiring

ARP Wiring

This image shows the terminal block, the terminals are identified as follows:
(1) Negative/Ground 12 Volt connector for electronics (black wire).
(2) Positive 12 Volt connector for electronics (violet wire).
(3) D+ alternator signal - optional (black wire).
(4) S+ solar panel signal - optional (white wire).
(5) -12VDC heater (white wire).
(6) +12VDC heater - 16A fused (red wire).

Dometic 8 Series AES & MES Wiring

Please click here for detailed wiring instructions.

ARP Fan Install

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


RML8555 VIA

Install Boiler Sensor

This photo is of an RMD 8501 burner and boiler assembly. The boiler housing needs to be opened to install the ARP Control boiler sensor. The boiler housing can be squeezed to unlatch the joint that holds the sheet metal together.

ARP Boiler Sensor Install

Click here for temperature sensor install video.

Dometic Wiring

The yellow arrow in this image shows the location where a tab holds a disk at the bottom of the boiler housing. This tab needs to be bent down to release the disk that is holding the bottom of the boiler housing closed. After all 3 tabs are bent down, remove the inner disk, and then the boiler housing can be squeezed to open, as seen in the below photo.

RML8555 Burner

This photo shows the burner assembly and the boiler housing opened for the installation of the ARP temperature probe. Please note that the burner assembly is at the bottom of the flue tube. The burner attaches to the flue tube with one Phillips screw. To the left of the flue tube is the boiler tube, the boiler tube is easy to identify because the electric heaters are welded to the boiler tube. It is on the boiler tube that the ARP sensor is mounted.


RML8555 Cooling Unit

This is a photo of an RLM 8555 cooling unit without the burner assembly or the boiler housing and insulation blocking the view of the respective tubes within the boiler housing.

The arrow points to the approximate location where the ARP sensor should be installed. Be sure to insulate the sensor and wire exiting the boiler housing very well, the insulation around the wires will protect the wires from being cut by the sheet metal.

Please click here to see further information regarding the location of the ARP boiler sensor.


Dometic Safety Sensor

This photo shows the Fridge Defend safety sensor clipped onto the boiler tube. Please note the fiberglass insulation, GREEN ARROW, packed between the flue tube and the sensor.

Also note that the sensor can be mounted closer to the heaters (RED ARROW). If sensor is close to the heaters, just insulate the sensor very well.

Do wrap fiberglass insulation around the Fridge Defend sensor wires (PURPLE ARROW). If these wires are not protected, the sheet metal can cut the wires.

Please click here to see further information regarding the location of the ARP boiler sensor.


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: RM 8501; RMD 8501; RM 8505; RM2852; DMD 8505

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 10.5 VDC
Maximum DC Power Supply 22 VDC
Maximum AC on 12VDC Supply Line 6 VAC
Board 12VDC Fuse 1 A
Board AC Fuse ---
VAC Operating Range 103-132 VAC
DC Heater Power Rating 130 W
DC Current 10.8 A
DC Heater Resistance per Heater (cold) 0.85 Ohm
DC Fuse 16 A
AC Heater Power Rating 135 W
Current 2.5 A
Heater Resistance per Heater (cold) 106.7 Ohm
Gas Pressure 10.5-11.5 Inch-H2O
Gas Jet ---
Gas Thermocouple 25-35 mVDC
Electrode to Burner Gap ---
Thermistor @ 32degF 27.7 kOhm
Please click here for more information on Dometic thermistor troubleshooting.

FRIDGE MODEL: RM 8551; RML 8551; RM 8505; RMD 8551; RML 8555; RMD 8555

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 10.5 VDC
Maximum DC Power Supply 22 VDC
Maximum AC on 12VDC Supply Line 6 VAC
Board 12VDC Fuse 1 A
Board AC Fuse ---
VAC Operating Range 103-132 VAC
DC Heater Power Rating 170 W
DC Current 14.2 A
DC Heater Resistance per Heater (cold) 106.7 Ohm
DC Fuse 30 A
AC Heater Power Rating 190 W
Current 1.6 A
Heater Resistance per Heater (cold) 75.8 Ohm
Gas Pressure 10.5-11.5 Inch-H2O
Gas Jet ---
Gas Thermocouple 25-35 mVDC
Electrode to Burner Gap ---
Thermistor @ 32degF 27.7 kOhm
Please click here for more information on Dometic thermistor troubleshooting.

Displayed Error Codes & Alarm - Tone

Refrigerators with an electronics system, either MES or AES, indicates a malfunction by the LED (Triangle Icon with !) or display flashing.

If a failure occurs, the indicator LED (Triangle Icon with !) flashes simultaneously. In the case of AES models an acoustic alarm sounds.

DISPLAY

MES Type Fridge AES Type Fridge FAILURE
LED is flashing 230 is flashing 230V mode: "120VAC" not available or voltage too low
LED is flashing 12 is flashing 12V mode: "12V" not available or voltage too low
LED is flashing GAS is flashing GAS/Auto mode: Flame not ignited
All temperature setting LEDs are flashing All temperature setting LEDs are flashing Temperature sensor defective, refrigerator works on mid temperature setting
LED + all temperature setting LEDs are flashing HE1 is flashing 120VAC - Heating element defective
LED + all temperature setting LEDs are flashing HE2 is flashing 12V - Heating element defective

ALARM - BUZZER - ACOUSTIC TONE

AES-Models: Should the door be kept open for too long (more than 2 minutes), an acoustic signal is initiated (pulsing whistle tone).

AES-Models: Should the electronic control detect any failure, an acoustic signal will sound (pulsing whistle tone). At the same time the display starts flashing.

NOTE: If the door is open, the interior lighting is switched off automatically after 2 minutes. TIP: Put phone inside fridge running video to test to see if light goes out when door closed, if light does not go out the door sensor is not working.

TIP: Put phone inside fridge while running video and shut door to test to see if light goes out when door closed. If light does not go out after 2 minutes the door sensor may not be working.

If you cannot find what you need please use the Contact Us form from the top or bottom menus.

The Fridge Defend by ARP - A Small Investment Yielding Huge Returns - Your Safety!

REQUIREMENTS FOR ALL PACKAGES SENT TO ARPC LLC:

Before using the mailing address, email or use the Contact Us form from the upper menus to get current mailing instructions.
Shipment must be authorized beforehand by email, not phone call.
A photo of the ARP installation needs to be emailed to us.
The return must be shipped within 1 week of authorization; tracking number is required; email tracking number to us ASAP.
A note must accompany the package with detailed reason for shipment along with sender return address & phone number.
Full list of return policies are found on the purchase page.

ARPC L.L.C. ~ 3024 Wharton ~ Butte, MT 59701

Fridge Defend
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