SPAN PressureGuard APM Owner's Manual page 10

5. When power switch is turned to ON, the unit will begin performing a system check. This
fills the air system completely, in order to confirm the proper connection and function
of both the mattress and the control unit prior to a patient being placed on the surface.
If the mattress is completely empty of air, this can take as long as 20 minutes. Since this
is rarely the case, however, this typically takes no more than 2.5 minutes.
6. The "Low Pressure" indicator light will remain on until this process is complete.
7. When system check is complete, "Low Pressure" indicator light will turn off and "normal
pressure" light will turn on. System is now ready to be set for the next user.
NOTE: If "Low Pressure" remains on after 30 minutes, call for service.
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P10773 R2 CO# 2619