Technical Service: How to Drain the Brew Tank

WARNING: The video depicts a service job intended for a trained service technician. Do not attempt this on a hot machine. Failure to turn off machine may result in severe injury! Unplug your machine before removing any body panels. Failure to cut power to the machine may result in high voltage shock or other severe injury! Any users performing this service should exercise extreme caution. If you have any questions regarding this service, please contact your distributor, a service professional, or Synesso, Inc.

We will start by shutting off the water supply and element breaker (make sure the machine is cooled off). The first step is to take the pressure off the brew pressure gauge and off the brew group(s). We can accomplish this from the handheld controller “Temperature Overview” screen. We will press and hold the home (upper right) button, press and release the 4th line (lower left) button, then release the home button to access programming menu level two. Press the down arrow button until the “Temperature Display” and “Brew Valves” screen is shown and press the 4th line button once so that the word “Normal” is flashing. The text should change to “On” after pressing the up arrow button; this turns on the brew valves and drains your pressure down to zero. When the brew pressure gauge is drained to zero, turn your brew valves back off (so “Normal” is displayed) and now we can drain the brew tanks.

Remove the lower front panel on your machine to expose the brew tanks, then loosen the brass drain caps on the first and subsequent brew tank(s) and watch for water to drip. If water is spraying, you have not yet fully depressurized. If water is not spraying, you are good to go. Notice that water is not running out when you take the cap off; this is because there is no air travelling into the brew tank. As soon as air is available, water is going to run out! To aim the exhaust water into the drain pan, install a length of 3/8” diameter rubber tubing over each brew tank drain fitting and put them in the pan towards the drain. Press the up arrow again on the handheld controller to turn the brew valves on and watch as water begins to drain from the tanks. Air is going in through the grouphead diffuser holes and water can travel out the bottom of the brew tank.

TIP: If you are not done in less than five minutes, the electronics will cycle off and you will have to start this process over again.

When draining is complete and no more water comes out, be sure that the brew tank(s) are completely drained, and the process has not prematurely ended due to being timed out. You can now turn off your brew valves, remove the drain tubing, and reinstall the drain caps. The drain cap does not need to be tightened very hard; it should just be snug.

CAUTION: Always remember that wires are live when the electronics are on; do not touch or adjust the wires in any way.

With dry brew tanks, you can now remove the brew valves and begin cleaning procedures or a start descaling process. To refill these tanks, turn on the water supply and allow air to bleed out during a normal cycling/engaging of the brew process. All done!

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