APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
20950 Issue 1 April 98 B--9
The output air is checked by a pressure switch and a small amount,
controlled by an inline orifice, is allowed to leak onto a humidity
sensor. A failure in either the pressure or humidity is detected by the
electronics system.
ThePeltierheatsinkassemblyhasasecondoutputconnection,through
a solenoid valve to a vent and a third output connection through a
Pressure Relief Valve (PRV) (to the same vent). Opening the solenoid
valveperiodicallyejectsthecondensationcaughtinthePeltierheatsink
assembly. The PRV limits the air pressure to a factory setting of 4bar.
Compressor
Filter
Needle
Valve
Vent
Clean Air
Output
Pressure
Relief Valve
Solenoid
Valve
Peltier
Heatsink
Assembly
Airdryer System
Pressure
Switch
Humidity
Sensor
Pressure
Regulator
30500P--3
Inline
Orifice
The Peltier heatsink assembly has a thermally insulated condenser
where the compressed air is cooled, and a heatsink that dissipates the
heat taken from the air. The heatsink is cooled by a fan that draws air
into the cabinet througha filter. This air alsoprovides generalcooling
and is expelled by a fan on the opposite side of the cabinet.
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