- My Forums
- Tiger Rant
- LSU Recruiting
- SEC Rant
- Saints Talk
- Pelicans Talk
- More Sports Board
- Fantasy Sports
- Golf Board
- Soccer Board
- O-T Lounge
- Tech Board
- Home/Garden Board
- Outdoor Board
- Health/Fitness Board
- Movie/TV Board
- Book Board
- Music Board
- Political Talk
- Money Talk
- Fark Board
- Gaming Board
- Travel Board
- Food/Drink Board
- Ticket Exchange
- TD Help Board
Customize My Forums- View All Forums
- Show Left Links
- Topic Sort Options
- Trending Topics
- Recent Topics
- Active Topics
Started By
Message
A/c not cooling at night
Posted on 7/6/18 at 8:30 am
Posted on 7/6/18 at 8:30 am
Upstairs unit, runs fine during the day and cools properly.
At night it runs for hours and hours and the temp increases. A/c guy thinks there is a leak but can't find anything. What the crap is going on?
At night it runs for hours and hours and the temp increases. A/c guy thinks there is a leak but can't find anything. What the crap is going on?
8
Posted on 7/6/18 at 8:34 am to BoogaBear
That just doesn't add up. When it's not cooling, have you tried shutting it down for a few minutes, then restarting?
Posted on 7/6/18 at 8:36 am to BoogaBear
My leak occurred in/at the condenser in the attic. ~2K fix.
Posted on 7/6/18 at 8:42 am to BoogaBear
Like alx said that doesn’t make sense. The only thing that I could think of is that it’s freezing up? Is the fan still blowing? It is that would tell you that it isn’t freezing
Posted on 7/6/18 at 8:49 am to bbvdd
Trust me I know it doesn't make sense.
Here is normal operation during the day. The white line is the indoor temperature. The blue block is the A/C running, the white is the fan.
Here it is running overnight. Runs all night and the temp increases to 78. Then it magically starts cooling again in the morning.
ETA: The only difference is at night the doors to the bedrooms are closed for my daughters.
Here is normal operation during the day. The white line is the indoor temperature. The blue block is the A/C running, the white is the fan.
Here it is running overnight. Runs all night and the temp increases to 78. Then it magically starts cooling again in the morning.
ETA: The only difference is at night the doors to the bedrooms are closed for my daughters.
This post was edited on 7/6/18 at 8:52 am
Posted on 7/6/18 at 8:51 am to BoogaBear
Is it mildly freezing up during the day?
Posted on 7/6/18 at 8:53 am to Hammertime
quote:
Is it mildly freezing up during the day?
Not that I'm aware of.
Posted on 7/6/18 at 8:53 am to bbvdd
quote:
Is the fan still blowing? It is that would tell you that it isn’t freezing
If your evaporator coil in the unit itself freezes, the fan will still blow, but you won't get any cold air out of the vents.
I had that problem just a month or so ago. I wound up taking my unit apart enough to get to the coils and saw they were frozen solid. I took my wife's hair dryer and defrosted the thing, and that took almost an hour to get all the ice out the coils and fins. Then I saw where the coils were dirty and took one of those stiff nylon brushes and pulled all the dirt off the coils.
After putting it all back together again, it worked fine and has done so ever since.
I have double filters on my unit and change them regularly and that was only the 2nd or 3rd time I've had to clean the coils on the thing since I put it in back in 92.
Posted on 7/6/18 at 9:03 am to BoogaBear
quote:This could be bad, no? Return air issue?
The only difference is at night the doors to the bedrooms are closed for my daughters.
Posted on 7/6/18 at 9:11 am to gumbo2176
quote:
I have double filters on my unit
That doesn't starve the unit of return air feed?
I know from personal experience, if a unit starts freezing up routinely there's likely a refrigerant leak (too cold on the colds and not enough air flow to get rid of condensate so it freezes up and it enters into a constant state of freeze up and re-freeze until the coil is a block of ice) then the only thing you can do is run the fan itself with no A/C to defrost it..and you better hope your condensate pan is big and your condensate line is not plugged up.
Posted on 7/6/18 at 9:12 am to AlxTgr
No idea? It's cooler up there now with the unit off. It's like it's blowing warm air.
Posted on 7/6/18 at 9:16 am to BoogaBear
Maybe the unit is partially frozen during the day and fully freezes up at night when outside temp drops? Have you tried completely turning the unit off for a day and let it completely thaw out
Posted on 7/6/18 at 9:25 am to al_cajun
Yes, it was off for an entire day last week. Worked fine for a week then back to this. I'm guessing that's why he thinks there is a leak since it keeps freezing up.
Posted on 7/6/18 at 9:39 am to BoogaBear
It's probably running the entire day, freezing, then thawing out at night. Shutting it off for a day let it thaw out somewhat
Posted on 7/6/18 at 9:40 am to NASA_ISS_Tiger
quote:
That doesn't starve the unit of return air feed?
Apparently not since it's been like this since day 1. The pleated filter is in the return air grill and my unit is one of those in the closet type with the return air under the platform the unit sits on.
The hole cut in the bottom of the platform to allow for the return air also has one of those green coarsely woven filters that I remove and clean when I replace the filter in the RA grill.
Posted on 7/6/18 at 9:43 am to gumbo2176
I'm assuming your ac guy is qualified to check pressures.
I would check the outside unit at night to see if the lines are sweating and ice free. Then check the inside unit for ice too.
I would check the outside unit at night to see if the lines are sweating and ice free. Then check the inside unit for ice too.
Posted on 7/6/18 at 9:46 am to gumbo2176
quote:
Apparently not since it's been like this since day 1. The pleated filter is in the return air grill and my unit is one of those in the closet type with the return air under the platform the unit sits on.
The hole cut in the bottom of the platform to allow for the return air also has one of those green coarsely woven filters that I remove and clean when I replace the filter in the RA grill.
Oh, so it has a coarse filter and a fine filter? That makes more sense. I was confused if it had like 2 1600 filters. Mine isn't even rated for 1 1600 rated filter. I have to run 800s in mine which are fine.
Posted on 7/6/18 at 9:47 am to ItzMe1972
He just did a 400 psi pressure check and a 250 psi vacuum check. All is well with both, appears there's no leak.
Now I'm even more confused.
Now I'm even more confused.
Posted on 7/6/18 at 9:58 am to BoogaBear
Try leaving all doors open all the time.
Posted on 7/6/18 at 9:59 am to BoogaBear
There is no such thing as a 250 psi vacumm check ! There is a high side and low side pressure check that helps diagnose system conditions. The only reason to pull a vacumm on the System is to eliminate any moisture and contaminants and prepare for a refrigerant fill.
Page 1 of 4
Popular
Back to top
Follow TigerDroppings for LSU Football News