Home Improvement Asked on December 3, 2020
I recently had new HVAC installed. I am noticing it being little louder than what I had previously. The new system is American Standard 80% efficiency with ECM blower motor. My question is
Can I reduce the fan speed to make it little quieter? – I asked the contractor who installed it and he said he can certainly changed the fan speed but there might be and issue that your ac may get icing. So is that true that by reducing fan speed may create icing issue?
AC is not Turing off automatically even when temp reached to set point. I have checks that the fan is on auto setting and thermostat shows the set temp. If I increase the set temp to higher than what is currently on display then it shuts off automatically but when it gets to desired temp, it does not shut off automatically.
What could be the issue? Thermostat or faulty wiring?
Thank you in advance.
If the evaporator will ice up depends on the type of control if it is orifice or capillary tube control it may Ice up but if a thermal expansion valve called TXV this regulates the flow and it should not but I have seen TXV controlled system ice up a few times. As far as your system not shutting off when the temp is reached this is to keep the system from short cycling there is a setting sometimes called “dead band” usually around 3 degrees and is set in your thermostat it may be a setting like +2 -2 this would be a 4 degree dead band or the thermostat won’t turn the heat on until 2 degrees below set point and won’t shut off until 2 over set point same with the ac, you can usually change these I change mine based on season +0 -2 is my summer setting and +2 -0 is my winter setting. If it takes 10 minutes to change 1 degree a 2 degree dead band is ok but if you reduce it two far your energy cost will go up and the life of your system may be reduced from the repeated startups.
Answered by Ed Beal on December 3, 2020
What I get from searching on your model is that your condensing unit is a basic single compressor model with a modest SEER of 14 or 16 depending on which evaporator and air handler it's paired with so I doubt you have a variable speed compressor, although you might have a two speed condensing fan.
However, your air handler inside is described as having a variable speed motor. This could mean it is continuously variable in a range during cooling or just has two speeds in which a higher speed is used for a/c and a lower speed is used for heating. Can you tell if the fan is varying in speed? Is it louder sometimes and quieter others?
The long run time of your air handler after setpoint is reached is unusual in my experience but could be a feature of this type of air handler. For the time being I suggest you just use it without over controlling, but keep records on how long the air handler is running.
Answered by Jim Stewart on December 3, 2020
Thanks folks for taking time answering my question.
I upgraded to new thermostat and now my AC cycles fine. (10-15 min on avg hot day).
Answered by Mayur on December 3, 2020
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