OK, I’m lazy. I use a Keurig coffee maker. My wife does not drink coffee and I like the convenience of the one-cup-at-a-time system.
Over the years, Keurig has made changes in their design that only aggravate the user. Their original B60 was a nice machine. It was not overly noisy and mostly reliable.
In the second generation, Keurig introduced “quiet brew” technology to be used in the B65 and higher models. They still made the B60, but used a overly noisy pump (louder than my alarm clock). Now, perhaps this was done in the spirit of reliability; perhaps the noisier pump is more reliable, I don’t know. But I do know that the noisy pump annoys me to no end.
Now, I want to replace the water pump with a ice maker solenoid. I would plum the ice maker solenoid to my reverse osmosis water (I only use RO water in my Keurig to prevent hard water problems).
From what I can determine, the Keurig uses a 12V DC pump for the water (all the components on the Keurig are 12V DC it would seem). The ice maker solenoid is 120V AC-25 watt. So I would need a 12V relay to take the 12V signal for the water pump and use it to open the ice maker solenoid. Then, plum the RO water supply (which is under somewhere between 8 and 60 PSI–it’s a captive air tank that is at 8 PSI empty and the full pressure is dependent on water line pressure, but it cannot exceed the water line pressure which is 60 PSI per my water supplier).
So, what have I not considered? I can get a 12V relay that is rated to switch 125V AC at 20 amps. My ice maker solenoid is rated at 25 watts or 0.2 amps. I am guessing the 12V draw by the solenoid would be less than that of the water pump, so that should be OK. There is a check valve between the water pump and the water tank, but I cannot believe it would take more than 8 PSI to open (the minimum pressure from the RO system), so even with a near-empty tank, it should still fill the hot water tank of the Keurig.
Has anyone else tried to do this? Can anyone find an issue I haven’t considered?