Pressure Limit
Adjustment
The compressor is delivered with pressure switch settings which turn the compressor pump off when it reaches a tank pressure of 135 PSI, and turn it back on when it reaches 105 PSI. Normally these settings should not require any adjustment.
In the event it becomes necessary to change, first make certain the compressor is disconnected from the power source. Then remove the black plastic cover below the On/Off switch. This is done by removing the rubber plug on top of the housing and inserting a Phillips® screwdriver. See
Figure 10.
The hex nut on the top of the exposed switch is used to adjust the pressure limits. See Figure 11. Turn it clockwise to increase the pressure and counterclockwise to reduce. This will move both the maximum pressure shutoff point and the min- imum pressure
After adjusting, replace the cover and reconnect to the power source.
Adjusting Nut
Fig 10. Removing pressure switch cover.
Fig 11. Adjusting nut on pressure switch.
For the G8299, it is possible to control which motor comes on first by adjusting these pressure limits. The machine is set from the factory so the 2 HP pump comes on first to minimize amperage draw. If this is not acceptable, adjust the limits on the 2 HP higher, and set the limits on the 2.5 HP lower so they will operate in reverse of the facto- ry setting.
Do not remove the pressure switch cover with the machine plugged in to power. When the cover is off, the electrical con- nections are uncovered and can be a source of electrical shock. Make the adjust- ments progressively until the desired level is reached, and disconnect from power each time you turn the adjusting nut. Serious personal injury can occur.
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G8297/G8298/G8299 Air Compressors | |||
