Hitachi UX Twin Nozzle Service Manual page 43

3 The rotating speed of the pump can be changed to 3.0Hz, 4.0Hz or 7.0Hz.
Please note that the pump operating frequencies of UX-Twin nozzle machine are
different from those of UX-Single nozzle machine.
[Caution]
The pumps and solenoid valve can be operated simultaneously however, operate them
with care when the solenoid valve are turned on while pump is activated because it is not a
steady operation.
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