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FLOWMETER CALIBRATION INSTRUCTIONS
These instrucons are to be performed using the owmeter calibraon feature made available with rmware
version 2.64. See page 54 for informaon on accessing this feature in the programming.
WARNING: It is recommended that this calibraon be performed while the machine is cool and the heang
elements are o. Performing the calibraon while the machine is hot can lead to errors in desired accuracy.
Materials Needed:
• Cup (or pitcher, etc.) with at least 250ml capacity and a wide enough mouth to capture water
dispensed from brew group
• Sloed screwdriver short enough to t under group head (might need “stubby” one)
• Graduated cylinder with 250ml capacity and 2ml resoluon or beer.
WARNING: Some users may prefer to use a scale instead of a graduated cylinder. Note that the density of wa-
ter varies as a funcon of temperature. Grams and milliliters are equivalent for water at 4°C (just above freez-
ing.) However, at brew temperatures water density is closer to 0.97g / ml. Therefore, if you weigh some wa-
ter (in grams) out of a hot brew group and want to calculate its volume (in ml,) you must divide by roughly
0.97.
Calibraon Instrucons:
1. Clean and backush the brew groups.
2. Remove the diuser screens and screws.
3. Ensure the heang element breaker is o.
4. In order to make the starng brew pressures more consistent, run each group briey without the
pump on. This can be done using the BREW VALVES funcon on the TEMPERATURE DISPLAY
screen found in the 2nd level menu (see page 52).
5. In the 2nd level menu, cycle to the FLOWMETER CALIBRATION screen. (see page 54)
6. Posion the cup under the 1st brew group
7. Follow the on screen prompts to dispense a test volume of water into the cup. The machine will automa-
cally stop when the test volume of water has been dispensed (approximately 250 ml).
8. Carefully transfer the water from the cup into the graduated cylinder and measure the volume.
9. Enter the measured volume on the screen.
10. Proceed to the next brew group, repeang steps 6-9 unl all groups are calibrated.
11. Return to the TEMPERATURE OVERVIEW home screen.
Oponal Vericaon:
Note: the vericaon step does not ulize the calibraon program, but is intended to verify that the calibra-
on was successful.
1. In the rst level menu, adjust the volume for program 1 on each group up to 444 TOTAL WATER COUNT.
2. Run program 1 on all of the brew groups for a few seconds to get each group up to pump pressure.
3. Posion the cup under the 1st brew group.
4. Run program 1 to dispense 444 cks worth of water into the cup.
5. Verify with the graduated cylinder that the group has dispensed 100ml of water.
6. Proceed to the next brew group, repeang steps 3-6 unl all of the groups are veried.
7. Turn the heang elements back on and reinstall the diuser screens and screws.
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