Norcold N145 & N150

A well built Norcold N145 or N150 will last the life of your RV when it is protected by the Fridge Defend, this pages shows how to install boiler overheat protection on your fridge.


Norcold N145 or N150 Control Panel

Norcold N145 & N150 Overview

The Norcold N145 and N150 refrigerators are manual control type of refrigerator. This means that one has to hold a button down and ignite the gas flame.

The first figure on this page shows the N145 & N150 control panel, the yellow button is pushed to ignite the LP gas flame. It is on the backside of this button that the Fridge Defend is wired into the system.

Norcold N145 N150 Thermocouple Interrupt

N145 & N150 Wiring

This is the N145 of N150 wiring diagram, where:

• Selector Switch terminals 2B & 2A are wired to the Thermocouple Interrupter.
• This diagram is a block diagram where 'M' is the volt meter.
• The coil on the right is the gas valve.

Norcold N145 Wiring

Norcold N145 N150 Wiring

Yellow is the thermocouple interrupter seen in the above image.

Norcold N400 Fridge

Norcold N145 & N150 Thermocouple Interrupt Adaptor

This is a close up of the above interrupt adaptor circled in red as it would appear on the backside of the selector switch that is pushed to turn on the LP gas.

Norcold N400 Wiring

Referencing the Norcold N145 & N150 Mode Selector Switch image above, the thermocouple interrupt adaptor is wired to the Norcold this switch. Terminals identified as '2A' & '2B' above in the wiring diagram, the wires colors are identified in the manuals as red and black.  We are told that the wires can be orange or red and blue, the installer needs to identify the proper wires .

The ARP relay will be spliced into one of the sets of wires coming from the interrupt adaptor to the selector switch. Two female spade connectors will be used to connect the Fridge Defend Relay at terminals 30 and 87, the normally open terminals of the relay as seen in the figure.

The relay should be mounted as close to the control as possible. That is, the wires to the relay need to be as short as possible.

Please click here for another view for wiring the interrupt adapter.

Please click here if you want to control the 12VDC heater.

Norcold N440 N500 Electric Heater Boiler Tube

ARP Temperature Sensor Install

This photo shows the temperature sensor installed on the boiler tube.

The Norcold N145 series of fridges are very dependable refrigerators as long as the boiler is not allowed to overheat.

The Fridge Defend by ARP could help your refrigerator last the lifetime of your RV!

Norcold Service Manual Downloads

Service Manual Download: N145 & N150

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