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Electronic Expansion Valve (EEV) After 1/20
A traditional TXV uses springs and a temperature bulb to open and close a valve port that controls the flow
of refrigerant entering the evaporator coil. An electronic expansion valve (EEV) controls the refrigerant
flow much more precisely, increasing the performance and efficiency of the refrigeration system. The EEV
controls the flow of Refrigerant by opening and closing the valve port based on the response to signals sent
to the EEV by an electronic controller. The electronic Control bases these signals by processing
information provided from a temperature sensor and pressure transducer located on the discharge side of
the evaporator coil.
These sensors monitor the evaporator superheat and protects the compressor from any liquid flood back
under low superheat conditions.
EEV Controller Settings
The
electronic expansion valve controller also allows the use of different types of refrigerants without the
need to change the expansion valve.
The controller is set from the factory to run on 449A refrigerant and will not need any changes to the
control unless another refrigerant is used.
Note: Check your State and Local regulations for approved refrigerants for your install location.
Federal Industries is not liable for any alternate refrigerants used.
The control is located in the front left corner of evaporator tub under the Display Deck Pan.
Note: Never change any of the other setting other than the refrigerant type. It may also be necessary
to change the superheat setting only when using a different refrigerant
.
Changing Refrigerant
•
Access the set point mode by pressing and holding the
button until Ctl displays on the screen.
•
Use the
up or down arrows
to advance through the available set points until rFG displays on
the screen and press the
botton.
•
Use the
up or down arrows until the desired refrigeration displays on the screen and press and
hold the
button until rFG once again displays on the screen.
•
Press the
to return to escape the settings menue.
Changing Superheat
•
Access the set point mode by pressing and holding the
button until Ctl displays on the screen.
•
Use the
up or down arrows
to advance through the available set points until SSP displays on
the screen and press the
botton.
•
Use the
up or down arrows to set the desired superheat displays on the screen and press and
hold the
button until SSP once again displays on the screen.
•
Press the
to return to escape the settings menu.
