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Noisy compressor at start and end of defrost cycle

Goodman GSZ130241A / ARUF182416
The Goodman unit now sounds like this during the defrost cycle:
The unit ran reasonably quiet for several months (installed Nov 2008) with just a very short clang at start.

New HVAC tech had a quick look at unit and is returning in a day or so when he has more time to remove refrigerant as a start in diagnosing problem.
Here is what he found:
40 F outdoor ambient - 73 F indoor
Hi PR 410 / Lo PR 96 Discharge temp 158

Air handler tested w/ actual measured voltage/current:
Hi speed: 19 F temp rise = 947 CFM
Mid speed: 21 F temp rise = 856 CFM

Unit was originally charged by weight (6 oz added) by different tech who said unit was installed correctly. They state that this is ''normal'' noise.

Could the factory overcharge (if that is the case) or other malfunction creating high pressures cause permanent damage to scroll resulting in this noise?

The unit heated (and defrosted) very good and the original noise levels were better than a neighbors unit. I was very pleased with it until it started making this noise.

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  • lmpearson Feb 19, 2009

    About 7 to 8 amps if I remember correctly.

    Unit is not cycling on overload. It runs 20 min on 40 min off at 35 outdoor. No tripping of Hi pressure switch.

    Still awaiting tech. He mentioned overtightened "bullet" on indoor coil or possible valve malfunction on outdoor unit. His first plan of attack is to reduce charge while checking pressures. Worst case scenario is complete system purge, check components for proper sizing/functioning, pulling good vacuum and recharge by weight.

    Here's Goodman's heating data sheet that came with units:
    At 40 F data sheet shows 212/54 @ 7.0 A
    Page 18
    GSZ130241A* / AR*F182416**

    Tech says pressures not correct for 410. See anomalies between different unit tonnage.

    I now understand that a good HVAC tech is much more important than anything else - even brand of unit.

  • lmpearson Feb 19, 2009

    Static pressure was not checked. Airflow check using 5 KW aux heater strip w/o heat pump:
    Air handler tested w/ ACTUAL measured voltage/current:
    CFM = KW X 3514 X 1.08 / TR
    237 VAC / 20.0 A
    4.74 KW
    Hi speed: 19 F temp rise 74 to 93 = 947 CFM
    Mid speed: 21 F temp rise 72 to 93 = 856 CFM

    Heat pump (about 40 F outdoor temp)
    BTU = CFM x TR / 1.08
    Using 856 CFM I came to 20,631 BTU for temp rise 72 to 98

  • videotecho May 11, 2010

    Internal pressure safety control should prevent damage but continued high system pressures are hard on any compressor.

    Did tech also check the current draw? An overcharge would cause noise, high discharge pressure, compressor cycling on the overload, and higher current draw than what's shown on the system data plate.


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Overcharged temperature split times cfm gives you btu's did he check static pressure .50 or less

Posted on Feb 19, 2009

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