Danfoss had a really nice thing going with one of their controllers called a "room controller" where it had a small screen where you could read the superheat across the evaporator, temperature of air in and temperature of the air out, pressure in bar and converted to temperature as well as real temperature and core temperature if you had a defrost sensor installed.
The whole thing was door mounted, which was nice, because it could be mounted in the door, so you or the customer could access it without opening the cabinet door.

it was all viewable on a 2 inch screen, with graphic showing the placement of the sensors, and it was so well done that you could just flick through the pages and and just like that, you had the health of that particular room/evaporator.
it was easy to understand for the customer if you were trying to get information over the phone.

I've been looking for pictures of this one, but I can only find pictures of the new ones.

The systems I have been on, this controller has been used to simply control the superheat across the evaporator, and monitor

this controller is now discontinued and has been replaced by a controller that looks like this:
IMG107317854064.jpg

it has to be mounted to a DIN rail inside the cabinet, it's impossible to explain to the customer how to access the information you need over the phone.
While it works as it should, it's utterly useless when something is not working.


So together with a friend of mine, I am working on a solution.

7" touch screen PLC
Base application is 1 compressor unit and freezing room, cold room and cool room.
you can choose PID regulator for all three rooms to maintain superheat, or on/off regulator for the solenid if a TX valve is used (regulates on room temperature)
If cold or cool room needs to cooling, freezing room will also run, unless on defrost, to give the compressor enough load to run.

on screen choice whether HP/LP is pressure switches or 0-10V/4-20mA sensors (HP switch required, if regulations in your country does not require a HP switch, put a jumper in)
same for Oil pressure, on screen selection if it's OP minus LP or OP minus HP or if a differential pressure switch is fitted.

for a basic system like this, the selling price would be around USD 2.500,-
that is for a complete control unit for the whole system, hang it on the wall and connect the wires.

compared to the danfoss EKC controllers, all the settings would be in plain text when you enter the setup menu instead of having to to parameter r12 to change something.
you can go to the settings menu, make changes to the superheat, then straight back to the overview to see the opening degree of the valve, instead of having to wait for the controller to timeout and go back to the main screen...
Not to talk about the EKC or AK-cc controllers where you will end up with callouses on your fingers while trying to keep an eye on all the different measurements... All that will be accessible on one page...


While it's not new technology.

With the selling price being $2.500, is this something that would appeal to anyone?
Having it all easily accessible on a 7" touch screen, compressor control and room control for 3 rooms in one unit (doesn't have to be freeze, cold and cool, from the screen it can be sat to whatever temperature you want )


And by easily accessible, I mean that it has been designed so that a service person can throw a glance at the screen as he walks by, and have all the information he needs, instead of having to go through five different menus to get information

And we are of course accepting any input towards features that is wanted