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Hitachi SRL Series Instruction Manual page 19

Oilfree scroll compressor
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Operation (continued)
2. Changing the Pressure Settings
The control pressure can be changed with the
switches shown below on the control panel.
An energy saving operation can be performed to
lower wasted energy by lowering the maximum (stop)
pressure. The normal pressure settings of the air
compressor are shown in the figure to the right.
Under the Muti-Drive control mode, the delivery
pressure is to be above the "recovery pressure +
12/15psig", and will not reach the maximum setting
pressure normally. Under Multi-Drive control mode,
more energy savings is possible by lowering the
recovery pressure.
■ Procedure for changing the control pressure setting
Press the "Stop" switch, and drop the pressure in the air receiver to 70psig or lower (it is impossible to
change the control pressure setting if the pressure in the air receiver is above 71psig). Once the
pressure in the air receiver is below 70psig the control pressure setting can be changed by following
the procedure below.
Digital Display
EX. 122PSIG Model
1
Verify that the pressure is indicated on the digital display.
Press the stop switch and then press the start switch and hold both buttons for 5
2
seconds to change the indication on the digital display to PC.
To change the maximum (stop) pressure, press the start switch. The indication on the
3
digital display changes to H122 (this is an example of what the indication on the digital
display will be for the pressure settings from the factory).
Pressing the stop switch will lower the maximum pressure setting by 1 PSIG.
4
Pressing the start switch will raise the maximum pressure setting by 1 PSIG.
After the change in pressure setting has been set, press the Screen Shift switch
5
and the digital display indication will change to PC.
Pressing the Screen Shift switch again will change the digital display indication to the
6
pressure display.
To change the recovery (start) pressure, press the stop switch in steps 3 above to change
the digital display indication to L110 (this is an example of what the indication on the digital
display will be for the pressure settings from the factory) and then change the pressure
settings as shown in steps 4 and later.
Maximum (Stop)
Pressure (psig)
Recovery (Start)
Pressure (psig)
Steps
Steps
5 & 6
Steps
15
Pressure Setting
122PSIG Model 145PSIG Model
122
110
2, 3 & 4
Steps
2 & 4
Digital display
145
115

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