I have a customer with a 4 ton 698BNX048000 2 speed heat pump. It vibrates in low speed heat. The 4 ton replaced a 3 ton 698BNX036000. The three ton had no vibration issues. Condensers were the only thing changed. 76 foot line-set, long line-set applications followed. Pulled to below 500 microns, added charge for line length and checked by chart per manuf chart. Charge is correct. Air handler is a match for both condensers, is FE4ANF005000. Is one story home with A/H in conditioned attic(foamed roof) in up flow position app 12' above condenser.
Have changed compressor after Bryant tech visit and tech recommendation. Still vibrates. Before changing compressor, the access suction only small line to point on suction line between compressor and accumulator broke at point where it attached to suction line. Both Bryant tech and I agree it was probably due to vibration.
Am concerned if source of vibration is not found that even if vibration is not transmitted to A/H it will still be cause of failure in condenser.
Installed system in new home in 10/07/2004, replaced 3 ton with 4 ton in 5/03/2006. The install was deemed as fine by two Bryant service tech. Any help would be appreciated. Also , who pays? The customer was offered a 10 year parts and labor warranty. The vibration has not been the only issues, have also had numerous VC/VH VOLTS AND CHANGED START CAP AND RELAY TWICE. Rick
QuoteSuction line noise and vibration.
The scroll compressor produces two very close frequencies. These may result in a low level "beat" frequency which can be detected as noise coming along the suction line into a house. Elimination of the "beat" can be achieved by lessening either of the frequencies (see the third paragraph).
A second situation that may exist is that under some conditions the normal starting motion of the compressor can transmit an "impact" noise along the suction line. Three phase compressors may be more pronounced due to their higher starting torque.
Common remedies for these noises are to add a shock loop in the suction line, insure that an angled service valve is fastened to the unit, or add a suction line muffler.
These sounds are not usually associated with heat pump systems because of the reversing valve and tubing bends that are components of the system.
BTW what do you mean by VC/VH Volts?