This story begins with some fridges that had been returned to the retailer for various reasons.
The fridges are Brass Monkey branded and they are retailed through Jaycar Electronics, an Australian
electronics retailer, as well as RTM (Road, Traffic and Marine), an Australian outdoors retailer.
RTM happens to be owned by Jaycar Electronics. The two retailers share some other products between them,
but that's neither here nor there.

Because Jaycar stores couldn't feasibly return these 'dead' fridges to their head office in Rydalmere,
they opted instead to just keep them lying around at their stores taking up space. At some point the
managers got fed up with this arrangement and decided to just leave them outside the shop overnight.
Before doing that however, they irreversibly removed the controller/displays, assuming this would
render them 'unserviceable'.

Enter the crafty sales assistants.

After finding the data sheet for the compressor controllers, it was discovered that the compressors
are low voltage 3 phase units. They have a controller on the side of the compressor body that houses
all the smarts to make it work. It turns out that the displays are nothing more than a thermostat controller.
A simple way to choose set points and display current temps.

The data sheet showed us that by bridging pins, 'C' and 'T', we could call for the compressor to start.
That was a great discovery on its own, but the data sheet revealed more. It suggested the controller could
drive the compressor at different speeds! This function was not being utilised in the fridges being sold.
All fridges, as sold, were running at their lowest speeds, 2200RPM, probably in a bid to ensure the fridges
lasted for as long as possible.

We saw an opportunity to not only get these fridges running, but also drive them to higher speeds to account
for different ambient temps. The higher the ambient temp, the harder it will be for the fridge to get rid of its
heat. This seemed to be a big problem for some customers to get their head around; I saw many fridges mounted
in their vehicles, built into compartments with zero air flow. This is the worst case scenario for a fridge,
particularly when you consider they run at fixed temps.

The controller also had a fault output pin that could drive an LED, with six different faults being displayed.
The faults would be indicated by flashing between 1 and 6 pulses. These faults can be found in the data sheet.
For our purposes, we left this function behind. If the fridge stops running, that was pretty much the end of the line.

So what did we end up with?