Norcold N410 | N411 | N412 | Service Manual

Norcold N410 - N411 - N412 Series

This photo is a Norcold 410 cooling unit with the an early ARP Control mounted on the factory refrigeration controller cover. Please see next image for the newer style Fridge Defend type controller. The Norcold N410, N411, and N412 all have slightly different controller and cooling unit configurations, but the principles behind the operation and control of the different models is all similar. Please note that there is a black and yellow pair of wires going to the electric heating elements in the photo to the left. One wire pair is for 12VDC heat source and the other is for 120VAC heat source to drive the refrigeration process. Due to the high amperage draw for the 12VDC, most users only run the 12VDC when they are driving, we do not recommend using the 12VDC heaters as they can damage the fridge without the Fridge Defend protecting the cooling unit.

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

This figure shows the Fridge Defend wiring for a typical Norcold fridge installation. Please note that there is not a mechanical relay to wire on the newer versions of the ARP Control. Please make sure that the RV Power in has a fuse on the RV that limits the current to 5 amps.

This next photo shows a close up of a control mounted on a Norcold N412.3. All of the parts of the v1.0 ARPrv kit are shown, with the exception of the temperature sensor which is shown in the next photo. Please note that this is a data collection control because there is a header on the right of the ARP Control housing. Piggyback wiring connectors (not included in kit at this time) are used to connect the ARPrv Control positive and negative leads to the Norcold controller power lines. The ARPrv Control relay can either interrupt the power to the Norcold control, or open one of the wires going to the boiler housing thermal switch.

The final photo shows the boiler housing door open, and the Fridge Defend boiler sensor is clipped onto the boiler tube of an N411. All versions of the control use the same sensor installation. Please note that insulation is placed between the boiler temperature probe and the boiler tube. This installation is helpful because the temperature sensor cable is isolated from the boiler tube. Do your best to insulate the boiler housing so that heat loss does not affect the cooling efficiency of your fridge.