Page 30 - Select Specialty

"Oil-Less” Scroll Medical Air Medical Systems

3.0 System Operation (continued)

3.2 Initial Start-up (continued)

Start each compressor by turning the H-O-A switch to the “Auto” position. Allow each compressor module to
operate for a short time (15 to 30 seconds) and check for any unusual noises or vibrations.

If everything appears normal, allow each compressor to run in the “Auto” mode until pressure builds in the air
receiver. The lag compressor should stop when the panel gauge pressure reaches 105 psig. Pushing the reset
button on the control panel can now silence the lag alarm. The lead compressor should stop when the panel
gauge pressure reaches 110 psig. Check for any leaks in the piping up to the inlet isolation valves of the
dryers. Repair leaks, if needed.

Open the inlet isolation valve on one of the dryers. The pressure reading on one of the gauges should be the
same as the panel pressure gauge. The other gauge will normally read 0 psig, and airflow will be coming from
the dryer purge exhaust muffler. It is possible, but unlikely, that the outlet dew point may be low enough to
activate the purge saving feature at start-up. If the purge saving feature is activated, then both dryer pressure
gauges will be at the same pressure as the control panel gauge and there will be no flow from the dryer purge
exhaust muffler. Check for air leaks.

Adjust the pressure regulator to the desired pressure setting.

Open the outlet isolation valve of the dryer/filter/regulator group. Check for air leaks.

Open the dew point sensor isolation valve.

Open the CO sensor isolation valve.

Slowly open the outlet isolation valve to allow air to flow out to the hospital.

Adjust the pressure regulator setting if necessary.

If everything appears normal, open the inlet isolation valve of the other dryer/filter/regulator assembly. If the
dryer pressures appear as expected, open the dryer/filter/regulator outlet isolation valve. Close the other
dryer/filter/regulator inlet and outlet isolation valves.

CAUTION: Only one dryer/filter/regulator group should be on line at a time.

Adjust the pressure regulator to the desired 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 as the panel pressure gauge.

Observe the system for normal operation.

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