Page 192 - Womens Pavilion

“Oil-Less” Scroll Medical Air

3.0 System Operation

Open the inlet isolation valve on one of the dryers. 3.3 Normal Start-up
The pressure reading on one of the gauges should
be the same as the panel. The other gauge will Hospital shutoff valve - CLOSED.
normally read 0 psig, and airfl ow will be coming
from the dryer purge exhaust muffl er. It is possible, Isolation (shutoff ) valves - OPEN.
but unlikely, that the outlet dew point may be low
enough to activate the purge saving feature at Receiver bypass valve - CLOSED.
start-up. If the purge saving feature is activated,
then both dryer pressure gauges will be at the One air dryer off line with valves CLOSED; the
same pressure as the control panel and there will other air dryer on-line with the valves OPEN.
be no fl ow from the dryer purge exhaust muffl er.
Main electrical power - ON.
Check for air leaks.
Disconnect switches - ON.
Adjust the pressure regulator to the desired
pressure setting. Pump mode to “Automatic” on touchscreen
display.
Open the outlet isolation valve of the dryer/fi lter/
regulator group. Check for air leaks. Pressure increasing to 110 psi.

Open the Dew Point/CO sensor isolation valve. Check that each compressor shuts down as it
reaches its off -limit pressure.
Slowly open the outlet isolation valve to allow air
to fl ow out to the hospital. Check that the mainline regulator is set for the
desired output pressure and adjust if necessary.
Adjust the pressure regulator setting if necessary.
Slowly OPEN the hospital shutoff valve.
If everything appears normal, open the inlet
isolation valve of the other dryer/fi lter/regulator NOTE: Opening the hospital valve may cause a
assembly. If the dryer pressures appear as expected, pressure demand that brings the lag compressors
open the dryer/fi lter/regulator outlet isolation back on-line. This is a normal sequence.
valve. Close the other dryer/fi lter/regulator inlet
and outlet isolation valves. NOTE: The Medical Air system is now on-line
and in the Normal Operating Mode (lead/lag
CAUTION: Only one dryer/fi lter/regulator group operation).
should be on line at a time.
To verify dryer operation, refer to Appendix A for
Adjust the pressure regulator to the desired desiccant dryers.
pressure.

Adjust the pressure regulator setting, if necessary.

The dryer should purge until the dew point
monitor reading is below minus 10°C. If dew
point is below minus 10°C; both pressure gauges
of the on-line dryer will read the same.

Observe the system for normal operation.

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