Now to wire the controller!
I purchased a LOVE TSS2-2100 dual stage controller from Dwyer
so I can control both heat and cool in my chamber.
This diagram shows how to wire it.
So, I wired in sections of 4" #14 solid cable from all the points I needed power, inserted the controller into my hole, and secured it.
I used terminal blocks to make all my jumps.
White wire coming in is common from the systems white wiring picked up from main cooling area, left hand side of this pic. The brown board on the left has an extra spot for additional hook-ups (very handy).
The black is hot from the system's red wiring and I picked it up directly from the original thermostat. I used wire nuts because I was lazy. Maybe I will go back and solder it later...
The green wire is the switch wire and leads to the system end of the red wire located at the original thermostat. This is the connection the controller will switch on/off for cooling.
In the above diagram the black hot wire leads to terminals 5, 7, and 10 to provide hot power. The white common wire leads only to terminal 4. The green wire leads to terminal 8.