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13-25-608 Page 48

3/2 Solenoid Valve (Y) -

This valve controls the position of the inlet valve in response to signals from the

AirSmart Controller. It also provides a small amount of scavenge air to carry off compressor shaft seal oil
challenge. See inlet valve assembly (2) for more information.

Pressure Sensor - Sump Dry Side (B1) -

This device is connected after the minimum pressure valve. It

converts the pressure in the plant air system into an electrical signal for use by the

“ASG2” controller for

monitoring and control load/unload operation.

Pressure Sensor - Sump Wet Side (B2) -

This device is connected to the oil sump. It converts the pressure in

the oil sump into an electrical signal for use by the

“ASG2” controller for monitoring and control. Its signal, when

compared to that of sensor

(B1)

, indicates the pressure loss across the air/oil separator element and it can also

trigger a shutdown event in case an exceedingly high pressure is detected.

Air Filter Vacuum Switch (B3)

This switch is used to monitor air filter condition and alert the user if the filter

requires service or replacement.

Temperature Sensor - Sump Wet Side (R1) -

This device is connected to the oil sump. It measures the

temperature in the compressor discharge port via the

“ASG2” controller. Its signal can trigger a shutdown event

in case an exceedingly high temperature is detected.

Temperature Sensor – Sump Dry Side (R2) –

This device is connected to the outlet side of the air/oil coalescing

element assembly bolted to the discharge of the oil sump. It measures the temperature of the compressed air, via
the ASG2 controller, after final oil separation has been achieved. Its signal can trigger a shutdown event in case
an exceedingly high temperature is detected.

The following items are provided in the Total System Hardware option:

Receiver (21)

- Provides storage of compressed air and serves as a support for the compressor unit and optional

dryer.

Refrigerated dryer (22) -

The [optional] electric refrigerated dryer cools and lowers the dew point of the

compressed air stream delivered by the compressor unit by removing the condensed water vapor entrained.

Dryer bypass valve (23) -

This pair of three-way valves allows the isolation of the refrigerated dryer (from the

compressed air line) for trouble shooting or maintenance purposes.

Drain isolation valve (24) -

This valves isolate the condensate drain device from the compressed air lines, thus

allowing for maintenance and/or temporary condensate drainage functions.

Condensate drain valve (25) -

This device provides automatic condensate drainage from the receiver. It, along

with the receiver, replaces the water separator shipped loose with the basic package.

Pressure relief valve (26) -

This device protects the pressure containing components included with the received

against high pressure exceeding 188.5 psig. Section 9, See page 70, for maintenance information.

Pressure gauge (27) -

This device monitors the compressed air pressure within the receiver.

The following items are provided in the Inlet Flow Modulation Hardware option:

The inlet valve modulation system is employed to match the supply of compressed air delivered by the
compressor to the customer

’s grid demand. Air flow modulation is achieved by gradually throttling (e.g., closing)

the intake valve poppet until a steady state discharge pressure level is reached. A PID algorithm stored in the
ASG2 controller regulates the duration and frequency two-way solenoid valves fill or vent the compressed air
stream that adjust the position of the intake valve poppet

– and thus its throttling setting.