Gardner Denver L4-5C Original User Manual page 38

Solenoid Valve (Y1) - This 2-way valve controls the position of the inlet valve in response to signals from the GD
Pilot Controller.
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 GD Pilot 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 GD Pilot 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.
Temperature Sensor, Sump Wet Side (R1) - This device is connected to the oil sump. It converts the
temperature in the oil sump into an electrical signal for use by the GD Pilot controller for monitoring and control.
Its signal is used to monitor compressor temperature and also trigger a shutdown event in case an exceedingly
high is detected.
(The following items are provided with the Total System variant)
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 valve isolates 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 195.5 psig. Section 9 for maintenance information.
Pressure gauge (27) - This device monitors the compressed air pressure within the receiver.
13-25-629 v03 Page 38