marc5180
01-09-2006, 06:03 PM
Hi all
i was sent today to change a compressor and an inverter board on a Panasonic cu-280mx51xp 2 pipe VRF, with 2 compressors. The refigerant had been changed in the factory from R22 to R407c when it was first installed. So after i had fitted the compressor and inverter board i recharged with what was written on the label on the condensor 21.7kg of R407c. I got the charge in then turned the power on and started her up. On my guages i was getting 6 bar on the suction (85psi) and 14 bar (200psi) on the discharge. I felt the discharge line leaving the compressor and it was luke warm, i then turned the fans off for a few mins to check if the compressor was ok ( to see if it built up the head pressure, which it did slowly) I left it running for about half an hour in which time i put all of the indoors ( there are 7 indoors in total) on test mode. In all this time the compressor that i changed didnt come on once. i turned the power off as i noticed that the inverter compressor connection was a bit loose on the inverter board so i tightened it up then turned the power back on but nothing happened. So i went upstairs and found each one of the controllers flashing "E27" which indicates numerous things from reverse phase protection to compressor open phase. I spoke to a few guys from Panasonic but didnt really get much help. One suggested in could be a new outdoor board, the other guy sugested it could be a transmission error between the indoor units. Any help from you guys would be appreciated
Cheers
i was sent today to change a compressor and an inverter board on a Panasonic cu-280mx51xp 2 pipe VRF, with 2 compressors. The refigerant had been changed in the factory from R22 to R407c when it was first installed. So after i had fitted the compressor and inverter board i recharged with what was written on the label on the condensor 21.7kg of R407c. I got the charge in then turned the power on and started her up. On my guages i was getting 6 bar on the suction (85psi) and 14 bar (200psi) on the discharge. I felt the discharge line leaving the compressor and it was luke warm, i then turned the fans off for a few mins to check if the compressor was ok ( to see if it built up the head pressure, which it did slowly) I left it running for about half an hour in which time i put all of the indoors ( there are 7 indoors in total) on test mode. In all this time the compressor that i changed didnt come on once. i turned the power off as i noticed that the inverter compressor connection was a bit loose on the inverter board so i tightened it up then turned the power back on but nothing happened. So i went upstairs and found each one of the controllers flashing "E27" which indicates numerous things from reverse phase protection to compressor open phase. I spoke to a few guys from Panasonic but didnt really get much help. One suggested in could be a new outdoor board, the other guy sugested it could be a transmission error between the indoor units. Any help from you guys would be appreciated
Cheers