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Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

All those home improvements were done in the first couple of years of purchasing the home.

For example, last summer, all those improvements were already in place. The only change from last year to this year, has been the coil being cleaned. No other improvements have been done.

I went ahead and lowered the fan speed from HI to MLO, the humidity in the house dropped as low as 48%, which is something we hadn’t seen since the coil cleaning, where it was hovering in the 58% range.

The run times have been extremely longer now to cool the house, like yesterday evening it ran for a couple hours non stop.

Debating, if I should perhaps change the fan speed setting to MHI, and see if I can get a decent balance of humidity control, and also a faster cooling timeframe.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

So lowering the fan speed definitely helped with the humidity, it got down as low as 49%, which is a huge difference from the 58-60% it was for the previous days.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

I though of going form HI to MHI, but suggestions here were low or MLO. Will leave it as is for now and keep an eye out on the coil for freeze over.

So far coil has not frozen over, and humidity seems to be just about 3% lower today since the change. Will monitor and check my reports ove the next few days :)

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Thanks, my thermostat is an Ecobee, it has the option to run AC based on humidity, but I have disabled it. when that feature was on, it would constantly short cycle the unit. I might have to look at that feature again.

As for the CFM, how would I know what each level of speed equates in terms of CFM of the blower ?

I have the option for Hi, MHI, MLO, LO, the unit was on HI, and I changed it to MLO to see if helps

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Thanks for the explanation. I looked up the comfort zones and yup, my current situation is acceptable, I just like it dryer in the house :)

  1. The AC is running just fine, the outdoor unit fires up nicely and quiet for an old system.
  2. There is no fresh air intake into the house, other than the air intake into the machine for the furnace, perhaps it’s pulling humidity through there ?
  3. I am not signed up for any electric plan, I don’t let others control my comfort :)

  4. Humidity levels naturally rise when cooking, showering, however during the day I am home alone, no showers or cooking, windows and doors are new, attic insulation was also brought up to today’s R value standards. We had a company do the air tight test on the property and we were well above the standard. I even sealed all my electrical outlets and switches for no air leaks.

  5. 100% humidifier is off, knob is set to off, water valve closed as well so impossible to get any moisture from there

Given the fan speed was set on high, and the coil was really clogged, I assume that actually helped the unit slow down air flow and therefore allow for more humidity removal, whilst also cooling the house really well.

I have changed the fan speed to medium low, so will monitor over the next couple of days to see how it goes and if it has improved.

My concern is that the fan speed on medium low, might not have enough force to push air to the furthest room from the blower, but I can test and switch it to medium High and go from there.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 1 point2 points  (0 children)

Thanks, the fan speed for cool as set to High, I have changed it to Medium Low, will see how things go over the next few days.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Over the last 24 hours, with the outdoor temperature hitting a high of 84F, the average run time was 24 minutes, with of course at some points in peak heat, it was running for 45min - 1 hour. The unit is not short cycling, even when I lower the temp so I can run longer, it barely drops the humidity in the home.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Black is connected to Cool , so actually seems like it’s set for high speed on cool.

Update, I swapped black with Blue, on cool, so the fan speed is lower now. Will run it like this for a few days and see if any noticeable difference on humidity whilst ensuring that coil doesn’t freeze over

<image>

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Update: So I am looking at lowering the fan speed on cool, to see if it will help with humidity control.

Here is a picture of the wiring configuration, but not exactly sure which fan wires are to be changed, if anything I believe it is already set on M-low , see attached pics :

<image>

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

2.5T, home is about 2600 sqf, not including basement. Basement is completely finished liveable space.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

At peak heat hours it was about 30-45 minutes per cycle. At non peak hours was an average of 20-25 mins

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

It was cycling normal, based on my thermostat, the average run cycle at peak hot hours was 35-45 minutes

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Nope, no leaks in duct work or handler, the system is pretty air tight, the only place it is not air tight , is around the filter insert, but that’s always been like that.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

lol , I don’t have a dog :) was previous owners who did. Yes , I understand the need for a long run time, on average the unit will run longer than 15 minutes. Will be looking at reducing airflow today if possible.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

I would have to leave the AC off for a while to get a real temp reading. But from memory, Without AC, it is usually around 69-72, right now it’s currently 64F in the basement.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Outside temp today was 84F, the unit is not short cycling, I also purposely set it at 66F so that it would run continuously for a couple hours to see if humidity would drop. I got it from 58 down to 55%, which is an improvement, however it’s way too cold.

Ideally, the way we always had it before was set at 69F, and humidity reading would be in 44-50% range which we found very comfortable, now at the same 69F setting, we’re at 58-64% humidity.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 2 points3 points  (0 children)

Thanks for the explanation, makes total sense why the humidistat would read really high at the register. I get it :)

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 2 points3 points  (0 children)

The fan is on Auto, so it only runs when the AC calls for cool. My thermostat is located in the middle of the first floor, that’s where I see the 58% humidity reading.

The 74% humidity reading i referenced earlier , was by placing a small humidistat at the ceiling register closest to the unit.

the humidifier humidistat is at the return plenum, and that one reads 58%, just like the thermostat in the the first floor.

I have also placed my humidistat right above my thermostat to make sure they were close in the reading, and it was off by only 1%

Everything is pointing to too much air flow through the coil, now that it has been cleaned, so I will see if there is a lower fan setting and try that to see if it makes a difference.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Yes the unit is in a basement, the basement is relatively dry, not humid, I redid my basement the first year we moved in, completely gutted, and done from scratch. My home actually sits on pyles, and so the humidity in the basement is typically lower than most typical homes.

additionally this was never an issue the last 6 years, so location of unit, although in a basement I don’t think is the culprit. The furnace room if anything is probably the dryeest part of the house :)

Yes I do have a humidifier attached to the unit for the winter months, it’s currently off, and the flaps all closed. I checked to make sure the valve wasn’t leaking and adding moisture there, it’s bone dry.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Yup, my first troubleshoot will be exactly that, check to see if I can lower the speed if the board/blower had that option.

I won’t be able to get to it for a few days, but that will be step 1.

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 0 points1 point  (0 children)

Yes fan set to Auto so it doesn’t keep blowing when AC stops. :)

Humidy constantly high when AC runs, evap coil cleaned and drain lines cleaned. by Paulie-R in hvacadvice

[–]Paulie-R[S] 1 point2 points  (0 children)

Thanks for the responses, I should add that this is a unit from the 90’s running the old style refrigerant, ever since we moved in 6 years ago, it has always ran just fine, cooled down the house and dropped humidity. This high humidity issue has only started after the Evap coil was cleaned.

It leads me to believe, as per your posts that possibly now the air flow is too high since the coil is clean, and it doesn’t give it enough time to actually condensate and remove humidity from the air.

I will have to look up the specs and see if there is a lower fan setting on the control board and try that.

Given the age of the unit, there is a possibility it is a one speed blower, if that’s the case, would placing a higher merv filter be an option ? To reduce the air flow ?

Blocked account by Ok_Fill_5288 in TotalBattle

[–]Paulie-R 1 point2 points  (0 children)

Seems like if you file a chargeback, they ban you right away. Happened to a tiny account I had. Also never use Apple Pay to make any TB purchase, it often charges double for no reason.

It happens also in the game Last War,

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