For layout, the dosing pump would have to go on top of the fridge. I had originally been thinking of having the dosing pump in the fridge, but I want the extra space and flexability afforded by having the dosing pump outside.
Plus for this type of fridge, its the freezer that actually cools down the rest of the fridge. So if the dosing pump was very high up it might frees the liquids inside of the actual pumps...
Time to measure twice and cut once!
I got out the square and made my marks on the top of the fridge where the line would be going through for the dosing pumps. This too a few min and bit of sketching things out on paper as I wanted the dosing pump the be dead square about the fridge and I wanted the lines to be able to into the fridge perfectly straight.
To make sure the holes were perfectly lines up I punched the holes... yes with a scribe.... but still.
First the holes were drilled at 1/8"
Then the were drilled out larger
And a pic from inside the fridge
If you are going to try this yourself I think it is worth mentioning that the holes for the lines that we drilled were just slightly smaller that the diameter of the tube. Not by enough to pinch the line, but by just enough that Trina had to work at it for a while and twist the lines as they went in to get them to fit.
A decent interference fit should mean that you have zero air movement between the fridge and the lines. You will always have some temp lost due to the lines coming out of the fridge being cold and transmitting the cold to the outside, but it will be minimal.
Here are the lines installed through the top of the fridge.
And now finally with the fridge done we can install it under the tank and start to transfer the livestock over and fill the new tank!