Page 194 - Womens Pavilion
P. 194
“Oil-Less” Scroll Medical Air
3.0 System Operation
When the dryer is in the “Automatic” mode, the 3.6 Emergency Shutdown / Alarms
dew point monitor controls the dryer purge, and
purging depends on the dew point condition. The following conditions may arise during
See Figure 3.7. When the dew point reading is operation.
above the setpoint of -10°C (14˚F), the dryer will
function normally (one tower at system presure,
one tower at 0 psig). When the dew point is below
the setpoint of -10°C (14˚F), the purge valve
will close. In this condition, both towers will be
approximately 100 psig (dependent upon tank
pressure) and the dryer will not shift towers until
the dew point is above -10°C (14˚F).
Figure 3.8 Unit Screens - Shutdown and Alarms
Motor Overload Shutdown - This will shut down
the compressor in question and will not re-start
until the reset button on the starter inside the main
control cabinet is reset and the appropriate reset
button is pressed on the control panel display.
See “Motor overheating” in the Troubleshooting
Section 4.0.
Dryer 2 is in Automatic mode, Dryer 1 is in Off position
High Air Temperature Shutdown - This will shut
Figure 3.7 Main Screen - Dryer Operation down the compressor in question and will not re-
start until the appropriate button is pressed on the
3.5 Normal Shutdown control panel. Before allowing the unit to re-start,
the condition should be checked (see “Compressor
Dryer in Automatic Mode shuts off unexpectedly” in the Troubleshooting
Section 4.0). Even after resetting the alarm and
Disconnect switches-OFF putting the compressor in “Automatic” mode,
the unit may not re-start, depending on system
Main power source-OFF sequencing and system pressure.
Hospital shutoff valve-CLOSED High Inlet Vacuum Shutdown - This will shut
down the compressor in question and will not re-
Air receiver manual tank drain-OPEN start until the appropriate button is pressed on the
control panel. Before allowing the unit to re-start,
Pressure gauge decreasing to 0 psi (0 kPa) the condition should be checked (see “Compressor
shuts off unexpectedly” in the Troubleshooting
Close air receiver manual tank drain when pressure Section 4.0). Even after resetting the alarm and
decreases to 0 psi (0 kPa) putting the compressor in “Automatic” mode,
the unit may not re-start, depending on system
sequencing and system pressure.
3-7 4107 9000 69.06
