Instructables
Picture of Keurig B60 automatic water filling system
This is a simple project I did to avoid adding water into my machine each time I take a cup of coffee. It's a pretty simple system but it also requires basic plumbing knowledge and electrical / soldering skills :-). This DIY will work with B40/B60 model or maybe other if you have enough place for the small bracket and water level sensor that we'll see in a moment.
 
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Step 1: Ice maker maker tap valve kit

Picture of Ice maker maker tap valve kit
First, get an ice maker self tap valve kit available in most hardware store for 8$-10$

Tap Valve Kit

For 3/8" to 1" O.D. tube
Valve with 1/4" O.D. comp. outlet
25'x 1/4" O.D. polyethylene tube
Compression inserts
1/4" O.D. comp. union
For installation of humidifiers, ice makers, and evaporative coolers

Step 2: Electrical parts - Electric Solenoid Valve Water N/C 12V 1/4"

Picture of Electrical parts - Electric Solenoid Valve Water N/C 12V 1/4
Next you'll need an Electric Solenoid Valve Water N/C 12V 1/4". It should be water type and "normally closed" to work with the system. I've got mine from Ebay for $12.50 http://www.ebay.ca/itm/300628527488

Step 3: Electrical parts - 12 volt relay

Picture of Electrical parts - 12 volt relay
Next you'll need a SPST 12 volt relay. 6$ online http://www.ebay.ca/itm/321025975659

Or you can use one you have lying around.

Step 4: Electrical parts - 12 1Amp + power supply

Picture of Electrical parts - 12 1Amp + power supply
Next you'll need a 1 amp + 12 volt DC power supply. 6$ online http://www.ebay.ca/itm/180883437481


Or you can use one you have lying around. If it's 12 volt dc and 1 amp or more

Step 5: Electrical parts - Water Level Liquid Sensor Float Switch

Picture of Electrical parts - Water Level Liquid Sensor Float Switch
Next you'll need a Water Level Liquid Sensor Float Switch. 2$ online http://www.ebay.ca/itm/160618121548

Step 6: Plumbing / water line installation

Picture of Plumbing / water line installation
You will need to follow the included instructions to install the water valve. The idea here is to get the 1/4 water tube to the Electric Solenoid Valve then to the brewer water reservoir so you can control water flow through the solenoid.

Step 7: Electrical parts - Installation

Picture of Electrical parts - Installation
*WIRING for reference only. Relay pin 85 & 86 are the coil, and 87 & 30 are the switched contactor.

You'll need to wire the solenoid, the relay, the water level switch and the power supply so that the water level switch control the relay that activate the solenoid.

Step 8: Fix the custom bracket

Picture of Fix the custom bracket
007.jpg
You will need to make a custom bracket to hold the water line (hose) and the level switch. You can use a thin aluminum plate and then fix it to the reservoir.
GlenA made it!1 month ago

Hey, thanks man. I just built this for my Jura-Capresso ENA 4. I pretty much used the parts you linked on Ebay. However, I was getting a fill-stop-fill-stop-fill-stop action during the brew cycle. To fix it, I swapped out the relay for an Altronix 6062 timer circuit, which puts a 20 second delay on the fill action. Perfect!

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Clarkdale443 months ago

Hey, its a very nice project. Can you tell me what amps of Relay you have used?

SyCoQc (author)  Clarkdale443 months ago
hello, it's 40A relay cause I had it on hand. You could use a 5 to 10A without problem. There is even one person that suggested to go without a relay but I'm not sure that the little float switch would handle the load. I prefer a small relay. Thanks

K, thanks, i have one lying around, i got it from an old ups circuit. Its 12v 10A, (N.O).

ronmansfield10 months ago
Very nice. Plan to do something like this. Wonder if anyone has thoughts or experience regarding the use of this float switch instead: http://www.ebay.com/itm/251241767990

It appears to be able to carry enough current to make the relay unnecessary.

My system is about the same as SyCoQc (his switch bracket is pretty clever) but I used a stainless steel vertical float valve from Ebay (

http://www.ebay.com/itm/Mini-Stainless-Steel-Liquid-Water-Level-Sensor-Internal-Horizontal-Float-Switch-/221396441174?pt=LH_DefaultDomain_0&hash=item338c419856

drilled a hole in the cover) that is capable of carrying 0.5 ampere so the relay is not necessary and it prevents the relay chatter when the switch closes and the inrush to the valve lowers the voltage for an instant. I've been using my level control system for over 18 months happily as I hated hand filling each day. I've also installed it on my Saeco espresso machine. I would recommend installing a throttle valve on the 1/4 line so there is no vibration due to flow. Lastly, I have reverse osmosis water so using brass fittings is not permissible as the water will actually dissolve the zinc in the alloy resulting with leaks. My whole system cost $28 installed. I used to spend 90 seconds filling both machines so I save around 10 hours a year by automating, it was very satisfying. I wish I had thought of the bracket per SyCoQc to avoid drilling the cover.

SyCoQc (author)  Chucktata7 months ago

The "Sensor Float Switch" I've used is rated at -> Maximum Switching Current: 0.5 A and Max Load Current: 1.0 A. So I think I could have done it without the relay but just wanted to be sure. About the bracket, yes it's a good idea because I'm now using a B70 Platinum model and I've simply swapped my little bracket onto the new reservoir. I'll also soon install a small overflow tube to prevent any spills because one time the float switch or something prevented to stop the water flow. I'll update my instructable. Thanks

MrLE8 months ago

I've been planning on doing this so I thought I would look around and see what anyone else had done. I currently take the tank off the Keurig and fill it from the refrigerator door since that is filtered water. My wife can't handle the large tank so I try to keep it filled. She usually refills it with a large mug if I haven't done my job.

I had planned on finding a valve and float system similar to a toilet tank refill system. So far I haven't found one small enough to fit in the Keurig tank. I still prefer that although they are probably more prone to over filling and over flowing.

I may cave in and use the electric valve and float switch. Instead of the relay I would prefer to go to with an electronic switch. I'm an electrical engineer so that is right down my alley.

Like someone else mentioned it's also a good idea to implement a filter like the ones we use for refrigerator ice and water. It slows down hard water deposits building up in the Keurig.

Nice implementation!

maclakey1 year ago
Do you find that this system "stutters" a bit? The float sensor I bought seems to be a we bit touchy. Any ideas on making it a bit smoother?
SyCoQc (author)  maclakey1 year ago
mine is smooth but I must add that I've set the tap valve to a very low water flow... If water level rise to fast the sensor assembly may stutter (if I remember a few test I did)
I did like you said, and it's working perfectly now... thanks.
that makes sense... I will put a flow valve in line to solve this issue... thanks for the idea!
MikeG-EET1 year ago
I would not buy the cheap 'saddle valve' shown, the kind that pierces the pipe by itself. They are not worth it, and even illegal in some places because they can leak terribly.
pcline21 year ago
This is a nice project that I might try to tackle over the holiday. Could you add an electrical schematic so I don't get the wires mixed up.
SyCoQc (author)  pcline21 year ago
Electrical wiring schematic now added !
Next a decent filtration needs to be added. I always use filtered water since my tap water flavors can vary since it is city water.
blkhawk1 year ago
Clever!