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28-07-2010, 02:38 AM #1
Trane Model CVHG 480 Leak Unfound
"Trane" Model CVHG 480 Motor and Compressor send for repairs due to leakage of tubes. Condenser and Evaporator Eddy Current Tested and retubed nine (9) tubes with about 80% -90% wall loss. Pressure tested to 5 PSI and hold pressure for 16 hours without pressure drop.
Vacuum out the moisture but unable to carry out full load, suspected tubes leakage.
All tubes end at tubesheet lightly plugged with rubber taper plugs, expanded all tubes expansion end and reapply pressure with N2 on Condenser side to 8 PSI, scanned all tubes on Condenser and Evaporator with SPM Model L10 Ultrasonic Leak Detector, pressure dropped by 1.2 PSI and maintained at 6.8 PSI. after forty two (42) hours dropped only 1.2 PSI. All the rubber plugs and no rubber plugs drop out, presume tubes not leaking.
Need kindest HELP from all members whoever come across such problems for guidance and advice on such problem.
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