Once you figure that out, your existing chiller should be a perfect stand-in for the grainfather chiller. So I would fill the fermenter with liquid, enough to make sure the temperature sensor, wherever it may be, is covered, plug it into a wall outlet, and then check the voltage against earth ground on those three wires in the XLR type connector, to identify ground, and then all three combinations of wire pairs on that connector (1-2, 1-3, 2-3) for a change in voltage (first), and, if no voltage difference is present, change in resistance (second) when you change the setpoint of that fermenter. The third wire would be power, but if you plug in the fermenter to its own power, you probably don't need that. And one of the the other two wires should be the ground this signal is referenced to. If you power your grainfather fermenter from its own A/C connection, then one of the three wires in the XLR type connector should change either voltage or resistance to ground when the temperature of the liquid in the fermenter moves from below to above the setpoint of this fermenter. Is that available online, or does anybody here have that? According to this (no diagram, though) the grainfather fermenter expects power (and ground, obviously), and I assume it sends a control signal for a valve (or the pump) on the grainfather chiller. Sounds like you need a diagram for the grainfather.
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If I could figure this out, then I'd at least know I can intercept that signal and figure out how to integrate it into my existing setup. I don't know which pin(s), or what voltage. So my assumption is when the temp controller demands cooling, something is sent through that 3-pin connector. This is the only other connector besides glycol in and out. There's a 3-pin kind of XLR style connector on the fermenter. How they use that to call for glycol from their own glycol chiller I have no idea. The Grainfathers have an integrated temp controller. The challenge with trying to fit the Grainfather conicals into this so far is not on the jacket side.
This makes sure the flow of glycol is sent through the fermenter(s) that are demanding it and then the return from the fermenters is returned to the manifold past that valve to ensure the continuous recirculation. The way I've designed my existing setup is I have a control box that powers external temp controllers and when load is called for by those controllers it passes it back through the control box to energize solenoids on the manifold and also a downstream NO valve to close it. So the glycol chiller itself has a recirc pump that requires circulation 100% of the time. Loop #1 only 'learns' about what #2 is doing when it sees the cooling fluid (glycol/water) reservoir getting warmer, but there is no electrical coupling, just this real world physical coupling with loop 2 making loop 1 work harder by heating up the cooling fluid. The setpoint for loop #2 has to be above the setpoint for loop #1, otherwise the two loops are completely independent. Temperature sensor #2 measures your fermenter or beer or whatever temperature, and turns the pump on and off that circulates glycol/water from the reservoir (controlled by loop#1) to your fermenter and back. They keep the cooling fluid at a constant temperature. I have no idea how a grainfather is usually wired, but most liquid systems with a reservoir seem to use two (or more, if you have more than one fermenter or storage keg or whatever you are eventually cooling with the glycol) independent temperature control loops: temperature sensor and loop #1 measure the glycol/water reservoir temperature and turn the primary chiller on and off.
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