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Old 04-08-2012, 09:15 PM   #16
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Air handler not pushing enough air


So I got a new Run Cap for $35... which I thought was a fair price till I saw Allied sells it for $8, but thats OK, helping to support my local companies

hooked it up and it seemed a little better...
then I happened to check and saw that the unit still had the same air filter that I installed in september, apparently the renter didnt know you were supposed to change them

when I took off the dirty filter, I got a decent amount of air coming out the vents... so hopefully that was the main issue...

time will tell...
Thanx a ton for all who offered up some ideas and thoughts....
hoping for another 2 years out of the system before I need to replace it
-Danny

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Old 04-10-2012, 03:09 PM   #17
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Air handler not pushing enough air


That wasnt it.....

Question... everyone I have talked to says that when a motor goes bad, it will just stop... never do they slow down... is that true?
I dont want to pay 300 for a motor if thats not the issue....

Next I guess I will try cleaning the evap coils....
from what Ive read, ill start with a shop vac and brush attachment, then maybe some mild dawn soap and water, and rinse it off, then maybe vacuum again...

hopefully that will help
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Old 04-10-2012, 06:03 PM   #18
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Air handler not pushing enough air


They sometimes run slow, instead of just stopping.

make sue you clean the inlet side, not just the discharge side.
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Old 04-10-2012, 06:07 PM   #19
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Air handler not pushing enough air


would I be correct in assuming the inlet side is the side the air hits first and then cooled off as it goes out the discharge side?
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Old 04-10-2012, 06:19 PM   #20
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Air handler not pushing enough air


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would I be correct in assuming the inlet side is the side the air hits first and then cooled off as it goes out the discharge side?
Yep, you got it.
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Old 04-10-2012, 06:43 PM   #21
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Air handler not pushing enough air


Quote:
Originally Posted by dcastillo View Post
That wasnt it.....

Question... everyone I have talked to says that when a motor goes bad, it will just stop... never do they slow down... is that true?
I dont want to pay 300 for a motor if thats not the issue....

Next I guess I will try cleaning the evap coils....
from what Ive read, ill start with a shop vac and brush attachment, then maybe some mild dawn soap and water, and rinse it off, then maybe vacuum again...

hopefully that will help
Most of the time they just stop,but sometimes they just slow down and run real hot in my experiance anyway
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Old 04-10-2012, 06:45 PM   #22
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Air handler not pushing enough air


That's good... cause the inlet is the easy side to get to....
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Old 04-16-2012, 12:03 PM   #23
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Air handler not pushing enough air


Quote:
Originally Posted by beenthere View Post
They sometimes run slow, instead of just stopping.

make sue you clean the inlet side, not just the discharge side.
Could I check and see if its running slow by reading the current draw to the motor? (with a Clamp meter)

Or is there another way to verify the motor is running at full (proper) speed?

thanx
Danny
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Old 04-16-2012, 12:41 PM   #24
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Air handler not pushing enough air


I have this same issue so I figured I would add my troubleshooting in hopes we can both get this figured out.

You can barely feel any air at all when you put your hand up to the vent.
It doesn't matter if it's on FAN, HEAT, or COOL the air flow coming out of the vents is the same.

I had this problem last year ever since i bought the house and over the winter and cannot seem to get it resolved.


It's a trane XR 11 system. The air handler matches.
It's a 1344 sq foot house, 1 story.
It has 10 flex ducts run off of the main plenum in a spider configuration.
8 are 6 inches and 2 are 4 inches.

- All my duct work is sealed with mastic and foil tape
- I've had the evap coil, and condensor coil cleaned
- the outside fan runs
- inside air handler runs.
- My plenum came made 2 90 degree turns coming out of the air handler so over the winter I modified it and made it a diagonal in hopes that would help... it didn't.

Other than that I'm at a loss of what to do. I've looked into getting in line duct booster fans but they said those are just for if you have 1 or 2 rooms that have low air flow...this is all of them.

Will be payng close attention to this thread to see the results.
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Old 04-16-2012, 12:45 PM   #25
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Air handler not pushing enough air


Quote:
Originally Posted by dcastillo View Post
Could I check and see if its running slow by reading the current draw to the motor? (with a Clamp meter)

Or is there another way to verify the motor is running at full (proper) speed?

thanx
Danny

You can check amperage. Also check the capacitor. Need a meter that reads microfarad (mfd).
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Old 04-16-2012, 12:54 PM   #26
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Air handler not pushing enough air


capacitor is brand new, just installed it.... didnt seem to help...
Thanx
Danny
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Old 04-16-2012, 12:58 PM   #27
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Air handler not pushing enough air


Quote:
Originally Posted by ryanxo View Post
I have this same issue so I figured I would add my troubleshooting in hopes we can both get this figured out.

You can barely feel any air at all when you put your hand up to the vent.
It doesn't matter if it's on FAN, HEAT, or COOL the air flow coming out of the vents is the same.

I had this problem last year ever since i bought the house and over the winter and cannot seem to get it resolved.


It's a trane XR 11 system. The air handler matches.
It's a 1344 sq foot house, 1 story.
It has 10 flex ducts run off of the main plenum in a spider configuration.
8 are 6 inches and 2 are 4 inches.

- All my duct work is sealed with mastic and foil tape
- I've had the evap coil, and condensor coil cleaned
- the outside fan runs
- inside air handler runs.
- My plenum came made 2 90 degree turns coming out of the air handler so over the winter I modified it and made it a diagonal in hopes that would help... it didn't.

Other than that I'm at a loss of what to do. I've looked into getting in line duct booster fans but they said those are just for if you have 1 or 2 rooms that have low air flow...this is all of them.

Will be payng close attention to this thread to see the results.

How's the air flow with the plenum completely off? Does it blow hard? A plenum should be straight, should fit the opening of the rear of the coil perfectly, 3' in length and then you should have the proper sized duct work.

You can check the static pressure (hire someone to do so if need be as you need a magnahelic or a digital manometer) to see how badly the air is being retricted.
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Old 04-16-2012, 01:03 PM   #28
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Air handler not pushing enough air


Quote:
Originally Posted by dcastillo View Post
capacitor is brand new, just installed it.... didnt seem to help...
Thanx
Danny
Check voltage to the unit ,to and through the board and to the motor. What is it at each spot? Check that amperage draw. Usually when a motor begins to weaken it will pull higher amps as it slows down trying to accomplish the work by use of more power, pulling more amps.

Run windings could be weak.

A big thing when motors fail is lack of proper air flow. The motors require a certain amount of cfm to keep them cool enough to not burn up.
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Old 04-16-2012, 01:09 PM   #29
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Air handler not pushing enough air


Ill check the current draw and the voltage to the motor next time I get to the rental unit... hopefully tonight...
thanx for the advice.
Danny
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Old 04-16-2012, 01:20 PM   #30
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Air handler not pushing enough air


Quote:
Originally Posted by Doc Holliday View Post
How's the air flow with the plenum completely off? Does it blow hard? A plenum should be straight, should fit the opening of the rear of the coil perfectly, 3' in length and then you should have the proper sized duct work.

You can check the static pressure (hire someone to do so if need be as you need a magnahelic or a digital manometer) to see how badly the air is being retricted.

How hard is hard? When I had it open it didnt blow any harder than a 20 inch box fan from walmart.

The plenum can only be 3 feet in length? Wow. Mines alot longer than that. See pic here:


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Last edited by ryanxo; 04-16-2012 at 01:29 PM.
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