american standard air conditioning
Why does my air conditioning make a loud clunk when it turns on?
Just got a new American Standard furnace that has 90% efficiency, 2 stage blower, A/C Coil and a new humidifier, but kept my old A/C Condenser outside, but got a new A/C coil in the furnace. Every time my A/C cycles on it clunks really loud once – like someone is banging against the side of the sheet metal ductwork.
Did it do this before replacement of the coil? If this is a new problem the indoor coil may have a check valve to allow it to be used in a heatpump application.
One thing thats common on some change outs like you mention is that the sheetmetal plenum expands (or bowes out) when the blower starts. Try running just the blower inside on high speed (some 2 speed furnaces wont allow high speed right off) Keep the (220) high volts off your out door unit while doing this look for and listen to the sound usually above your furnace. The metal plenum is quality but sometimes a fellow gets confused or forgets to put in a cross bend and the firmness of the plenum is not there. A piece of plywood screwed to the plenum can correct this if needed. But besure its not close to any heating vents, though 90% furnace should not present this type of concern.
Im betting on the ducting. It will sound just like you discribed.
It is also possible that 1 your compressor internal mounbting spring has broken or fallen off (no way to fix this as its inside the compressor), 2 your contactor (the switch that allowes the outdooe unit to cycle on and off) may need replacing, 3 you may have a line rubbing or kicking when the outdoor unit starts. Listen carefully to the clunk and try to determine where its comming from. Try turnming the main power (220) to the unit off and the work the thermostat see if the souind disappears or changes. If it changes then the contactor may be and probably is the problem. If it does nothing noisy ans just clicks softly the problem isnt the contactor and you’ll have to feel around to determine where its comming from.
The fellas that put this in for you Im sure will want to try and correct it for you, probably at no charge. If it is caused by their installation job. If its your outdoor unit…. You can live with it, replace the faulty part, or bite the bullet and replace the whole unit. But like I said its probably the ductwork sheet metal.
Let me know if this helps.
Good Cooling and have a great summer.
Oddly installed American Standard 12 SEER central air-conditioner
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