Page 127 - Med Plaza and Cancer Center

"Oil-Less” Medical Air Medical Systems

3.0 System Operation (continued)

3.2 Initial Start-up (continued)

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

The dryer should purge until the dew point monitor reading is below minus 12°C. When dew point is below
minus 12°C, both pressure gauges of the on-line dryer will read the same as the panel pressure gauge.

Observe the system for normal operation.

3.3 Normal Start-up

Hospital shutoff valve - CLOSED.

Isolation (shutoff) valves - OPEN.

Receiver bypass valve - CLOSED.

One air dryer off line with valves CLOSED; the other air dryer on-line with the valves OPEN.

Main electrical power - ON.

Disconnect switches - ON.

H-O-A switches - AUTO (starting all compressor units).

Pressure gauge increasing to 100 psi (689 kPa).

Check that each compressor shuts down as it reaches its off-limit pressure.

Check that the mainline regulator is set for the desired output pressure and adjust if necessary.

Slowly OPEN the hospital shutoff valve.

Note: Opening the hospital valve may cause a pressure demand that brings the lag compressors back on-line.
This is a normal sequence.

Note: The medical air system is now on-line and in the Normal Operating Mode (lead/lag operation).

To verify dryer operation, refer to Appendix A for desiccant dryers.

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