What Is the Minimum Time an Ac Compressor Should Be Off Before It Is Run Again
And so your Ac is working fine but makes a loud slamming-like noise when information technology shuts off. What could exist causing it? There are a number of possible causes. We've broken down the most common by where the noise is originating from: inside or exterior of your home.
Keep in mind, though, that without hearing the banging sound ourselves, it's difficult to correctly diagnose. Then for added peace of mind, we always recommend having a professional person AC tech take a look (especially if this is a new noise).
Need firsthand assistance with your air conditioner problem? Call us at (602) 842-0009 or schedule online today and we'll transport ane of our cooling techs right over.
If the noise is coming from inside your home…
Complaint: It sounds like in that location is a door inside the ducts that is slamming shut when the air conditioner turns off.
Indoor cause #1: Air filter is slamming against the grille
Most homes in the Phoenix surface area have return vents located in the ceiling of the home.
A typical return vent in the ceiling of a Gilbert home.
And inside the grilles of these vents is your air filter.
The same return vent open, showing the filter and duct backside the vent.
When your air conditioner turns on, these ducts suck in air from your habitation. Under sure conditions, the air filter may get sucked up confronting the top of the duct box. And then, when the AC turns off, the filter drops to the grille, making a slamming or thumping noise.
This is non a normal operating noise and is usually a sign of i of the following underlying problems:
An air filter that is too restrictive
Some homeowners install highly efficient air filters to improve the air quality of their home. Normally, this is a good idea. But if you go a filter that is likewise efficient (noted by a MERV rating of 10+) and merely ane-inch thick, information technology can restrict the amount of airflow through the filter.
As the air conditioner tries to pull more air through the filter, the filter itself can go sucked up into your ductwork.
The fix: You take 2 options:
- Replace the filter with a less restrictive, but less efficient, filter—While a bones air filter won't improve your habitation's air quality, it besides won't crusade the slamming problem.
- Upgrade to an air scrubber—An air scrubber is basically a thicker (up to six-inches) air filter, which catches more airborne contaminants (grit, smoke, etc) without restricting besides much airflow.
Your air filter is dirty
When your air filter gets too muddied, the clay restricts the airflow to your air conditioner. And but like we explained higher up, that can crusade the filter to get sucked up into the duct as the AC attempts to pull in more air.
The set: Clean or supersede the air filter.
Your render ducts are undersized
If your render ducts are too pocket-size, the speed of the air going through the returns can get powerful enough to suck an air filter upward to the duct.
The fix: You'll demand an Air-conditioning repair company to run new ductwork.
Indoor cause #2: A closing damper
Some air workout systems have dampers in them to modify the corporeality of airflow flowing to dissimilar parts of your home. The slamming noise may be the damper closing after the AC shuts off.
The fix: You may not demand to do annihilation, equally this could be normal functioning. But if the banging is extremely loud, contact an HVAC company to check it out, as the damper may demand to exist repaired or replaced.
Indoor cause #three: Expanding/contracting ducts
If you have sheet metal ducts, you may exist hearing creaking noises from the ducts expanding and contracting from the pressure and temperature changes.
The set up: Most likely your ducts are improperly sized for the amount of air going through them, which is what'south causing them to "pop" equally your air conditioner turns on and off. Or the ducts might not be reinforced properly. You'll need to have an Ac company discover and fix the duct problem.
Indoor cause #4: Problem with the fan
At that place may exist a problem with the fan in your indoor unit (or air handler) that'due south causing the blower bicycle to bang against another part of the unit. For example, the fan'due south mounts can get loose, which tin throw information technology off balance every bit it slows downwardly, causing it to hitting its enclosure.
The fix: The blower wheel assembly may demand to exist repaired or replaced past an AC professional.
If the dissonance is coming from outside your habitation…
Complaint: When your AC condenser (exterior unit) shuts off, at that place'south a loud bang that sounds like something hit a wall.
Outdoor cause #i: Compressor'due south internal support springs are shot
The compressor is the part of your outdoor unit that pumps refrigerant to and from your indoor unit.
And inside the sealed compressor casing are many parts, including the refrigerant pump. Virtually of these pumps are mounted on back up springs. But when a support spring breaks, the pump isn't held evenly whatever longer.
This makes it sort of like a spinning peak: when it'southward going quickly, its momentum keeps it upright and counterbalanced. Just as it slows down information technology starts wobbling.
It'due south the same for a compressor with a cleaved leap. When the air conditioner turns off, the pump loses momentum, which can cause it to knock against the example of the compressor and create a banging or slamming noise.
The gear up: To get rid of the dissonance, you'd take to replace the whole compressor since information technology is a single, sealed part. And replacing a compressor is expensive!
So, if information technology's non nether warranty, nosotros recommend you just leave information technology. The sound isn't necessarily an indication that the compressor volition fail anytime soon.
Outdoor cause #two: Fan knocking confronting unit of measurement
Your outdoor unit too contains a fan. And just like the indoor fan, parts can become loose. And and so the fan can hit other parts of the outdoor unit, causing a slamming sound.
The gear up: Depending on the consequence, you may need a whole new fan associates, or a few bolts may demand to be tightened.
Detect the source of your Ac'southward slamming racket
To figure out which of these problems is causing the slamming noise you're hearing, you demand a trained tech to listen to information technology. If you're in the Phoenix area, George Brazil can help. We've been serving the Valley since 1955.
Source: https://georgebrazilhvac.com/blog/why-does-my-air-conditioner-make-a-slamming-noise-when-turning-off
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