Delta Mayor D 1 Gr Manual page 51

5.4 SETTING UP
Set the main switch over "1" position.
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This machine is equipped with an auto level module: the boiler fills up automatically (green pilot
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light turns off once it is full)
When the water reaches ideal level, turns the main switch to "2" position.
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Wait until the machine reaches working pressure, open the vapour tap for a few seconds until
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the orange pilot light turns off, and then close it again.
Make sure boiler pressure is approximately at 1 bar.
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If needed, adjust boiler pressure acting on the pressure switch (see chapter 5.5).
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Extract one coffee and verify if the circuit pressure is 9 bar.
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Adjust the pressure trough the pump's by-pass screw (see chapter 5.5)
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Figure 5.4
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