Hi BM
Many thanks for all that extremely useful info. The exploded diagram is a bit different to mine (which is about 10 years old). I took a couple of pics:
This overview shows the 'stat to the bottom left. The space available for the new unit is top right, above the fan (but not too close). This is the control unit in more detail.
You can see terminals 12 and 11 on the left, which are for the sensor. It just disappears into the reservoir under the edge of the pump. Not too technical - I think I can do that :smile: (Probably explains why the exploded diagram shows a more recent, slightly improved model!). Mains in and out are on the right - I'm pretty confident I can work out which goes where and does what. Then just have to relate that to the terminals on the new control unit, turn it on, and hope nothing goes bang :-?.
TBH, I just bought a beer tower and tap on Ebay, so my current project is adding another keg to my bar. My present cooler is recirc only - beer lines go from keg to cooling pod to BE. Whilst we're on pics...
I could just add another cooling pod - but you can see space is tight. Instead, plan is a simple (crude?) cooling jacket - beer line threaded through holes in an old towel, tied tight round the keg, and connected to the recirc cooler. Coolant then goes on to the pod, so 2 cold beers from one cooling circuit. If it doesn't work well enough, it will have to be the revived 110 - 1 beer line, plus recirc for the pod. Wish me luck!
Cheers,
Chris