Pfannenberg EB 210, Operating And Maintenance Instructions Manual

Page: 62 / 293

Operating and Maintenance Instructions - Chiller - Series EB 210 - EB 440 © Pfannenberg GmbH Page 62 / 293
EN
3.3.3 Safety and protection devices
Refrigerant circuit
High pressure switch
To avoid excessive pressure of the refrigeration system, the high-pressure switch switches off the compressor and
the condenser fan and triggers a common alarm message.
After checking the cooling circuit, it must be reset manually by pressing the appropriate button on the machine
display.
Antifreeze protection
The antifreeze protection device prevents the evaporator from freezing.
It verifies that the temperature of the coolant in the evaporator does not reach critical values and switches off the
refrigerant circuit when a preset minimum temperature value is reached. At the same time, a common alarm
message is triggered.
Refrigerant filter/dryer
To prevent a malfunction of the refrigerant circuit, a filter dryer is installed which binds dirt particles and moisture.
3.3.4 Main switch
The main switch (on the front panel) serves as a safety device to disconnect the chiller from the power supply.
3.3.5 Control unit / Display
The built-in controller takes over all relevant functions to ensure the operation of the chiller.
These include the function of the cooling circuit, the function of the hydraulic circuit and the transmission of error
messages.
Depending on the device configuration, the controller may differ in design and functionality.
A detailed description of the function and parameterization can be found in a separate document available online
using the machine's serial number or model.
3.3.6 Connections
Electric connection
The electrical panel is equipped with a cable gland for the input of the power cables and a multiple cable gland for
any other wiring, such as signals and alarms. Cable entry is provided on the side of the machine, in
correspondence with the front area where the electrical panel is located. Removing the side panel makes it easy to
route the cables inside the unit and then enter the electrical panel.
Hydraulic connection
The hydraulic connections are located on the back of the unit. These are not flat sealing and must therefore be
sealed during commissioning. The size depends on the chiller type.