Greetings,
I had a tech just replace my 11 year old rheem/ruud 4 ton heat pump and air handler (rhslhm4821ja) for a newer version rheem/ruud 4 ton heat pump/air handler (RH1T4821STANJA). I'm having an issue with the return vents whistling after the install. This was never an issue on the older units, and it pushed more air than current setup. The tech adjusted the motor to T2 from T4 speed to soften the whistle, but it's still there. The tech opened another return vent near the air filter (next to air handler) but it helped a little with noise. Once the filter is removed, whistle is gone. It doesn't matter if it's a highly restrictive, less, even tried washable ones to see if it would change.
I'm puzzled since I didn't have any issues before, but now on much lower setting it still whistles. What changed for the return vents to be so restrictive? Are these newer motors that much more powerful? I've compared old vs. new max CFM and it's 1400 vs. 1600. What would be a cost effective solution here? Do I need 3.5 tons now? Open more return vents? Expand current ones? I'm confused. The tech did not measure static pressure, but I'll have him do it when he comes back.
I had a tech just replace my 11 year old rheem/ruud 4 ton heat pump and air handler (rhslhm4821ja) for a newer version rheem/ruud 4 ton heat pump/air handler (RH1T4821STANJA). I'm having an issue with the return vents whistling after the install. This was never an issue on the older units, and it pushed more air than current setup. The tech adjusted the motor to T2 from T4 speed to soften the whistle, but it's still there. The tech opened another return vent near the air filter (next to air handler) but it helped a little with noise. Once the filter is removed, whistle is gone. It doesn't matter if it's a highly restrictive, less, even tried washable ones to see if it would change.
I'm puzzled since I didn't have any issues before, but now on much lower setting it still whistles. What changed for the return vents to be so restrictive? Are these newer motors that much more powerful? I've compared old vs. new max CFM and it's 1400 vs. 1600. What would be a cost effective solution here? Do I need 3.5 tons now? Open more return vents? Expand current ones? I'm confused. The tech did not measure static pressure, but I'll have him do it when he comes back.
source https://hvac-talk.com/vbb/threads/2243745-Air-whistle-from-the-return-vents-on-new-unit?goto=newpost
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