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3 Controller
3.1 General
Control panel
General description
The electronic regulator automatically controls the dryer, i.e.:
• keeps the pressure dew-point stable
• stops the dryer whenever necessary
• restarts the dryer when required
In order to control the dryer and to read and modify programmable parameters, the regulator has a control
panel provided with:
• LEDs indicating the status of the dryer
• a display indicating the operating conditions or a fault
• keys to control the dryer and to access the data collected by the regulator
• buttons to manually start and stop the dryer
In general, the regulator has following functions:
• controlling the dryer
• protecting the dryer
• automatic restart after voltage failure (made inactive)
Controlling the dryer
The regulator keeps the pressure dew-point stable at no load by opening or closing the solenoid valve of
the hot-gas by-pass.
In order to keep the condenser pressure constant:
• For air-cooled versions, the regulator starts and stops the fan motor(s) as necessary.
• For water-cooled versions, the water regulating valve regulates the cooling water flow.
Protecting the dryer
Shut-down
• In case the pressure in the refrigerant circuit is too high, the dryer will be stopped.
• For air-cooled versions, the dryer will also be stopped if there is an overload of a fan motor. Warning.
• A warning message appears if the electronic water drain is malfunctioning.
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