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Originally Posted by flange

protect your compressor? yup, keep superheat in the suction gas. to do this, you will need to know how to work on your controller. Get the books and your instruments and work it out. if you dont have either, you got no shot at it.

thank you

Originally Posted by elheese

thanks for you Is it any method to protect my compressor?
EEV IS CARL&i have thermestor &L.P tranceducer that sending a signal to controller and then ordering EEV

no this is not to protect the compressor. This is for proper operation of the unit. I have worked on alot of units with electronic expanssion valves and normaly you have a temperature sensor on the suction line to calculate superheat along with the suction presure transducer. This is the main inputs that the exv uses to open or close. if your temperature sensors are off your exv will try to either close or open when it shouldnt depending if the temp sensors are reading to higher or lower than they should. Eventually you will get errors codes on the user interface. If you are 100% sure that your sensors are reading properly then you might have a bad exv which is not a comon thing. I would then suggest that you follow the proper troubleshooting steps to see if it is the valve or the output board controlling it.

protect your compressor? yup, keep superheat in the suction gas. to do this, you will need to know how to work on your controller. Get the books and your instruments and work it out. if you dont have either, you got no shot at it.

You really need to get a manual for the equipment you are working on. There are several different types of thermistors that will give you different values so you need to know which one you are working with. If you haven't done this already, google the equipment brand in the native language of where you think it was manufactured. Also be persistent with the people on site in finding the manuals that came with equipment. I have found them neatly filed away in the accounting department. Also check with the installing contractor.

You should call out a translator so we can understand what you are asking. My gut tells me you should not be messing with these units.

Originally Posted by flange

Guessing you might have an electronic valve with a superheat controller. lets say its a sporlan for example. there is a sensor in the suction line, and both sensor and valve get wired back to controller somewhere. the controller needs to be looked at to see if sensor is reading correctly, and if it is set right. for many, you need a manual, and in some cases, a display module to troubleshoot issues. google the device or post it here, lots of guys know "how to deal with them".

thanks for you Is it any method to protect my compressor?
EEV IS CARL&i have thermestor &L.P tranceducer that sending a signal to controller and then ordering EEV

I love them. some have over 6,000 steps

Originally Posted by flange

EEV's are used all over the place, not just on mini's or vrv's. they are commonplace these days. you will need lit on whichever one you are playing with, along with the display on some models.

Sometimes, they are a simple PC interface.

I'm liking them so far.

EEV's are used all over the place, not just on mini's or vrv's. they are commonplace these days. you will need lit on whichever one you are playing with, along with the display on some models.

Only use a very high quality DMM, and with a fresh battery or batteries, and very good condition test leads etc. These valves are typically 500 steps between 0 to 10 v's DC as mentioned. Tolerances of the sensors is very minute so a slightly oxidized connection will make radical changes in it's valve response etc.

However they are the future and are not going away that is for sure!

EEV OR SOMETIMES CALLED LEEV, are used on mini splits , vrv, s . from the literature you will get a resistance reading across the coil head , if that ohms ok check the output voltage off the board , mind you the connections are minute you will need minature or sub minature test leads , that wiil clarify the electrical side of an eev

You need to get some lit. on the machine or you are shooting in the dark. My typical experience is that the valve is getting a 0 - 10 VDC signal from a logic board that is getting a signal from a thermistor. Something could be wrong with any three of those components.

Guessing you might have an electronic valve with a superheat controller. lets say its a sporlan for example. there is a sensor in the suction line, and both sensor and valve get wired back to controller somewhere. the controller needs to be looked at to see if sensor is reading correctly, and if it is set right. for many, you need a manual, and in some cases, a display module to troubleshoot issues. google the device or post it here, lots of guys know "how to deal with them".

i have a problem with this unit that give me low pressure alarm and my charge is ok and also my compressor is ok but i am not sure about signal that recieved to expansionto open it if any one helping me ,i will be thanks for him

Yes, I know how to deal with them.

Moved to tech to tech commercial.

Ok, but what do you mean by "deal with"?

We can't read your mind.

i have a uniflair DX units in a data center
and a Carl expansion valve on it

In what context?

electronic expansion valve

does any one know howto deal with electronic expansion valve?