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Who's Central A/C knowledgeable? #2678281
07/17/19 12:35 PM
07/17/19 12:35 PM
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The Historic Hudson Valley
MONC Offline OP
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So we had Central A/C ( with heat pump ) installed about a year and a half ago.
Last season A/C worked fine .
This season, the A/C runs fine during the day, but in the late evening , the outside compressor is on, and the blower fan is on in the house, but I get barely any air flow.
I have been turning it completely off late at night ( concerned of burning something out ) .
When I turn it back on the next day it blows cold with good air flow until late evening again .

I am thinking the blower motor is fatigued or something.
The belt is brand new, there is no overheating / burning smells , so I don't think it is overheating .

Any ideas, or suggestions ?

Thanks in advance !


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Re: Who's Central A/C knowledgeable? [Re: MONC] #2678282
07/17/19 12:39 PM
07/17/19 12:39 PM
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Charlotte, NC
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Originally Posted by MONC
So we had Central A/C ( with heat pump ) installed about a year and a half ago.
Last season A/C worked fine .
This season, the A/C runs fine during the day, but in the late evening , the outside compressor is on, and the blower fan is on in the house, but I get barely any air flow.
I have been turning it completely off late at night ( concerned of burning something out ) .
When I turn it back on the next day it blows cold with good air flow until late evening again .

I am thinking the blower motor is fatigued or something.
The belt is brand new, there is no overheating / burning smells , so I don't think it is overheating .

Any ideas, or suggestions ?

Thanks in advance !


Does your AC have a HEPA filter? Check the filter and replace and see if that helps.

The other issue that you might be having is that you might have involuntarily signed up for your power company's energy saving program where they reduce power to your AC system during certain hours. That happened to me at one point.

Check and see if there's some kind of module installed on your outside unit's power supply with your power company's name on it.


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Re: Who's Central A/C knowledgeable? [Re: Orange_Crush] #2678289
07/17/19 12:56 PM
07/17/19 12:56 PM
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Nebraska
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If it blows fine all day, but not in the evening and the compressor is running, I would say it is low on freon and the coil is freezing up, blocking air flow.

Re: Who's Central A/C knowledgeable? [Re: 4406bbl] #2678301
07/17/19 01:31 PM
07/17/19 01:31 PM
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Northern OH
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Coil freezing up sounds like the best answer. It has a chance to melt during the night which is why your good the next morning.

Re: Who's Central A/C knowledgeable? [Re: 4406bbl] #2678303
07/17/19 01:33 PM
07/17/19 01:33 PM
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Charlotte, NC
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Originally Posted by 4406bbl
If it blows fine all day, but not in the evening and the compressor is running, I would say it is low on freon and the coil is freezing up, blocking air flow.


I thought about that, but it if a 1.5 year old system is low on freon, He may have bigger problems.


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Re: Who's Central A/C knowledgeable? [Re: Orange_Crush] #2678317
07/17/19 02:15 PM
07/17/19 02:15 PM
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Addison Twp, Mi.
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Idiots where my sister lives were sucking freon/refrigerant from peoples AC units to get high. Almost everyone on here street were hit by these punks.


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Re: Who's Central A/C knowledgeable? [Re: RobG] #2678319
07/17/19 02:24 PM
07/17/19 02:24 PM
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Las Vegas, NV
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Originally Posted by RobG

Idiots where my sister lives were sucking freon/refrigerant from peoples AC units to get high. Almost everyone on here street were hit by these punks.


I learned something new today. Thank-you.
This must be the single benefit to having my AC units up high on my second story roof.

Re: Who's Central A/C knowledgeable? [Re: Tom_440] #2678328
07/17/19 02:41 PM
07/17/19 02:41 PM
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St. Louis, Mo
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Originally Posted by Tom_440
Originally Posted by RobG

Idiots where my sister lives were sucking freon/refrigerant from peoples AC units to get high. Almost everyone on here street were hit by these punks.


I learned something new today. Thank-you.
This must be the single benefit to having my AC units up high on my second story roof.


May not be safe there. They'll send drones to siphon it off... laugh2

Re: Who's Central A/C knowledgeable? [Re: 318 Stroker] #2678356
07/17/19 04:16 PM
07/17/19 04:16 PM
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Downey, CA.
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Go where the blower unit is and check for this. Insulating mats are glued to the sides and top of blower unit to help with noise and keep hot in winter.. They are not glued very well. They fall and restrict airflow. The coil freezes and no cold air. Also make sure the drain line is cleared. Mine was a trane. Also get the cheapest filter you can buy and change them monthly. Expensive filters do not let enough air in and clog up quick.

Last edited by BB14404SPD; 07/18/19 09:59 PM.
Re: Who's Central A/C knowledgeable? [Re: BB14404SPD] #2678551
07/18/19 08:17 AM
07/18/19 08:17 AM
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Perkiomenville PA
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Pop the service cover off the outside unit. It's usually about 4 sheet metal screws at the corner where the wiring and plumbing enters. Look for one or more LEDs on the circuit board that might be flashing. The inside of the cover should have a wiring diagram and a table for decoding the flashes in to actual errors. Generally verify that the outside unit (compressor and fan) are operating correctly when the problem happens. Last time I had mine replaced, it acted up a few times during the first year until I found and fixed a couple of shaky electrical connections from the install.

Getting inside the the inside unit (evaporator and circulation fan) is less easy. The obvious service panel mostly gets you to the control relays and the emergency heater coils. Look for a less obvious panel on a different side of the unit until you can lay hands on the actual fan, squirrel cage, coils, drains, etc. Stare and compare at what's going on day time vs night time.


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Re: Who's Central A/C knowledgeable? [Re: MONC] #2678675
07/18/19 01:15 PM
07/18/19 01:15 PM
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Highland, MI.
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Originally Posted by MONC
So we had Central A/C ( with heat pump ) installed about a year and a half ago.
Last season A/C worked fine .
This season, the A/C runs fine during the day, but in the late evening , the outside compressor is on, and the blower fan is on in the house, but I get barely any air flow.
I have been turning it completely off late at night ( concerned of burning something out ) .
When I turn it back on the next day it blows cold with good air flow until late evening again .

I am thinking the blower motor is fatigued or something.
The belt is brand new, there is no overheating / burning smells , so I don't think it is overheating .

Any ideas, or suggestions ?

Thanks in advance !


Trust me, it is an owl - they are nocturnal. One is messing with you - may be sucking refrigerant to get high while you are sleeping - just like the aforementioned punks.


“Bear in mind that brains and learning, like muscle and physical skill, are articles of commerce. They are bought and sold. You can hire them by the year or by the hour. The only thing in the world not for sale is character.” (Antonin Scalia)
Re: Who's Central A/C knowledgeable? [Re: MONC] #2678705
07/18/19 02:26 PM
07/18/19 02:26 PM
Joined: Apr 2004
Posts: 3,128
The Historic Hudson Valley
MONC Offline OP
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Thanks for all the replies and suggestions.


I did think it might be a filter issue, so I replaced it with a mid-quality filter, and it did not help.
I will check to see if I have some kind of module from the power company on there, but don't think so.

I will check drainage hose.
Was going to check to see if coil was freezing up last night, but the dang thing ran fine all day and night long ! Why? I don't know .

I would think if some kind of insulating mat came unglued it would block the flow entirely, not just during the evening, but will see if I can get in there to check.
My inside unit is older , so new fancy electronics in there.
I will check out side service panel and see if there's any LEDs or other blinking lights for troubleshooting purposes.

Maybe I can get some pics on here for reference.

I do not think idiots or owls are sucking my freon out, people and animals not that sophisticated in these parts, lol .


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Re: Who's Central A/C knowledgeable? [Re: MONC] #2678754
07/18/19 04:59 PM
07/18/19 04:59 PM
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Crook County, ILL
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In Chicago people are stealing AC's, and there are security cages available on the market to enclose them to keep them safe!
https://wgntv.com/2019/07/17/several-central-air-conditioning-units-stolen/

Re: Who's Central A/C knowledgeable? [Re: MONC] #2678879
07/18/19 09:58 PM
07/18/19 09:58 PM
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Downey, CA.
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If you look in the blower unit it could partial of fully block. That was my issue. Run all day then freeze at night. Also due to the air it would get thrown around and then lodge. Go here and see the pictures about 2/3 down.

HVAC

Also I just re-read your post.At work we warranty our installs for two or three years depending on brand. Manufactures have 5 or ten years on compressors. Call the company that installed it.

Last edited by BB14404SPD; 07/18/19 11:04 PM.
Re: Who's Central A/C knowledgeable? [Re: BB14404SPD] #2679044
07/19/19 11:17 AM
07/19/19 11:17 AM
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Tulsa, Oklahoma
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For about $90 per year per unit I have a company come out twice a year to clean and run diagnostics on our HVAC units.

I think it is money well spent and has prevented further problems down the road.

I would also agree with an earlier post that your unit may still be under warranty.

While I think it is unlikely that you would have any sort of utility cut back on your system, if you did it would most likely be effective between 2:00 and 7:00 pm when loads peak.

Re: Who's Central A/C knowledgeable? [Re: 340Cuda] #2679082
07/19/19 12:56 PM
07/19/19 12:56 PM
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The Historic Hudson Valley
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Okay so no utility connections that I could see.
The drain hose looked clear / clean .

When I got late yesterday afternoon, the A/C was on, but NOT blowing well at all ( like I have been experience at night) .
So I took a look at the unit outside , and the coil looked pretty frozen .
I got the ice off with the hose, let it sit awhile then started the A/C again, and it seemed to blow better but not fully.
I ended it up turning it off before going to bed , and when I woke up this morning turned it on, and it blew cold with good air flow from vents.

I agree having a maintenance schedule set up for 90 /100 a year is a good idea, and will pursue that route.
I do NOT want the so-called experts who installed it back to the house, I went through a lot with them, and have concluded they are no experts.

So my question is what causes the coil to freeze like that?
It didn't happen last season ?

Thanks


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Re: Who's Central A/C knowledgeable? [Re: MONC] #2679084
07/19/19 01:00 PM
07/19/19 01:00 PM
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Fort Worth, Texas
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Originally Posted by MONC
So my question is what causes the coil to freeze like that?
It didn't happen last season ?

Thanks


It's low on freon / coolant, whatever they install these days. Gotta be a leak. 2¢

Robert


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Re: Who's Central A/C knowledgeable? [Re: 3hundred] #2679085
07/19/19 01:06 PM
07/19/19 01:06 PM
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The Historic Hudson Valley
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Originally Posted by 3hundred
Originally Posted by MONC
So my question is what causes the coil to freeze like that?
It didn't happen last season ?

Thanks


It's low on freon / coolant, whatever they install these days. Gotta be a leak. 2¢

Robert


Is there a valve that shows the refrigerant level?
How long should the refrigerant last before having to refill / recharge?



Last edited by MONC; 07/19/19 01:08 PM.

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Re: Who's Central A/C knowledgeable? [Re: MONC] #2679086
07/19/19 01:07 PM
07/19/19 01:07 PM
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The Historic Hudson Valley
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Also , after shutting off the A/C entirely at the thermostat, I am still able to turn on the fan manually.
When I do that, the air flow is still weak.
This is why I was thinking it was the blower fan.


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Re: Who's Central A/C knowledgeable? [Re: 3hundred] #2679088
07/19/19 01:12 PM
07/19/19 01:12 PM
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St. Charles, MO
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Originally Posted by 3hundred
Originally Posted by MONC
So my question is what causes the coil to freeze like that?
It didn't happen last season ?

Thanks


It's low on freon / coolant, whatever they install these days. Gotta be a leak. 2¢

Robert


Freezing coil can be caused by low refrigerant OR poor airflow.

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