i got a call for a 3 door reach in freezer down,unit has a history 4 pages long, original call my company sent a new guy out there who "topped the system off"so when i got the recall i put my gauges on and holy sh** he topped it off all right i was at something like 55/370 with c.p.r vave cranked all the way open,so i recovered the charge evacuated and recharged the unit it ran for three days and went down and we had just about every tech in my company there ever since i wound up back there friday and i think every part on this unit has been replaced since i was last there about 2 weeks ago,anyway the box had a compressor put in on thursday and never went below 16 degrees f i recovered the charge (again)took out the t.x.v it was all stopped up with oil i then took out the evap.and flushed out like a cup of oil and then flushed the rest of the system (using nitro)i installed a new t.x.v matched to compressor and design box temp. (0-10 degrees F)pulled a good vaccumm 485 microns and weighed in proper charge to no avail i still couldent get the box to pull down properly i left it a 18 degrees after 6 hrs of trying to pull it down and i am all out of ideas any help would be appreciated.
traulsen m/n g31010jc s/nT349200f96 design temp 0-10
R-404a pressures were 15/248
box temp 18 degrees ambiant in room 75