Which version of flotronic chiller is this if its flotronic 1 with the 2 digit display code 68 is A circuit Low Superheat which means T6 and T8 are the wrong thermistors to change it should have been T5 and T7.
Problem with chiller code 68, low suction superheat. Compressor body colder than normal as if exv valve is overfeeding refrigerant. Circuit A running normal so excluded water flow issues. Replaced T6 and T8 sensors, no fix. Checked all plug connections and reseated all connections at processor brd. Voltage pulse check at driver board good on power up. Replaced exv and new filter drier core, restart and still overfeeding and tripping code 68. I manually throttled the manual line valve and raised the superheat and the compressor stayed on line. Could the processor be bad and only on the B circuit. I installed this chiller 22 yrs ago and it has had several sensors replaced through the years and other wise good with original compressors still operating well. Any thoughts why it would be overfeeding refrigerant.
Which version of flotronic chiller is this if its flotronic 1 with the 2 digit display code 68 is A circuit Low Superheat which means T6 and T8 are the wrong thermistors to change it should have been T5 and T7.
sorry it is code 69 giving me the problem, circuit B. my bad
ok, does the circuit attempt to pumpdown on start up, can you hear or feel the EXV pulsing shut on start up.
Sounds like the valve is sitting open and not closing to lower superheat.
Why did you replace the EXV and thermistors. Do you have the controls manual for this chiller.
You could try pumping the circuit down and opening the EXV and then carry out the quick test to drive the EXV open and closed just make sure you have a spare O ring for the EXV
Did you measure the correct 25 ohms on the EXV from the connector pulled off the mother boards? This way you are testing the exv cable and the motor.
There is a exv valve voltage output test in the manual.
On Friday I checked and it was tripped off on code 69. I reset and also removed the main processor board, removed and reseated the eprom chip, cleaned and burnished all pin connections and restarted. It was running normal and not flooding the compressor, pressures/superheat stable. For what ever reason after removing the board the left compressor starts first which is circuit B, the right was starting as number 2. I read that the board randomly alternated lead lag. I had ohmed the motor/cable, checked all. The thermistors are usually the culprit. The exv was original on this circuit and the piston showed some wear marks. I thought it was originally sticking open. I will know tomorrow how it fared over the weekend. Normally if it trips the facility security calls me when the remote alarm light is on. I hate crap like this, it takes a lot of time away from other jobs.
I have a a 30gn 190 flotronic that codes 38 no pump out 40 low oil & 45 no oil The main reason for these supposidly is EXV which has been changed twice This is all pn the A circuit & A-1 comp fails. B circ seems to b bullet proof. You say you took PSIO board out ? Reseated the Eprom Chip ? Just what did that look like ? I spoke with a tech who worked for Carrier for ever and in 5 minuets told me what was wrong with my 97 unit and it sounds like your problem... is it fixxed ? My dealer is working on a getting a reman'd PSIO for me.