Part 1
Yes, it's probably sacrilege. Yes, I've argued that a PID on a pressurestat-controlled single boiler heat exchanger machine is unnecessary. And it is. So why have I done it to my bullet proof 2-group commercial Grimac?
I like digital readouts. The Sirai pressurestat is probably more than 20 years old, and while still performing well, is getting on a bit, with below-par contacts I've cleaned a couple of times now. And to adjust temperature is a bit of a pain, partly dismantling the machine covers to reach the pressurestat.
I put a lot of thought into the project. Out of necessity. No guides to follow. No instructions. No wiring diagram for the Grimac. Anyway, I bought an inkbird PID, 240v, with an overkill 40 amp solid state relay.
I'll detail the how in another post. For now, it's taken 1 1/2 days solid work, and there's some more to be done.
It's working, and we had our first espresso and latte tonight. Is it superior to the Sirai pressurestat control? Doubt it. But it's fun. Easy to adjust. And nothing blew up.
More to come.
Yes, it's probably sacrilege. Yes, I've argued that a PID on a pressurestat-controlled single boiler heat exchanger machine is unnecessary. And it is. So why have I done it to my bullet proof 2-group commercial Grimac?
I like digital readouts. The Sirai pressurestat is probably more than 20 years old, and while still performing well, is getting on a bit, with below-par contacts I've cleaned a couple of times now. And to adjust temperature is a bit of a pain, partly dismantling the machine covers to reach the pressurestat.
I put a lot of thought into the project. Out of necessity. No guides to follow. No instructions. No wiring diagram for the Grimac. Anyway, I bought an inkbird PID, 240v, with an overkill 40 amp solid state relay.
I'll detail the how in another post. For now, it's taken 1 1/2 days solid work, and there's some more to be done.
It's working, and we had our first espresso and latte tonight. Is it superior to the Sirai pressurestat control? Doubt it. But it's fun. Easy to adjust. And nothing blew up.
More to come.


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