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Old 08-13-2011, 06:03 PM   #16
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Blower Motor Wiring reversed?


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Originally Posted by Master of Cold
I guess you missed post #2..
Could have sworn I answered. Yes, I did follow suggestion to cap blue, replace w/ red. Nothing changed. As far seeing if wires are switched on relays, I posted pics. But, I think this is what separates the men from the boys. Might be a bit too complicated for this newbie.

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Old 08-13-2011, 06:06 PM   #17
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Blower Motor Wiring reversed?


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Originally Posted by beenthere
What size is the A/C, and what size is the return air grille. have you removed the air filter and ran it to see if it blows more air out.
2.5 tons ruud, air grille= 18"x12", both air filter removed, no change.
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Old 08-13-2011, 06:14 PM   #18
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Blower Motor Wiring reversed?


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Originally Posted by JJboy
What I am trying to say that your problem is not AC. The problem is more serious, insulation, load calculation, ducts calculation.

The blower motor is already setup in high speed in cooling mode ( motor black wire )
That may well be the case all the above, except I still do not understand why the volume of air coming out is so minimal.
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Old 08-13-2011, 06:41 PM   #19
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Blower Motor Wiring reversed?


What jj is saying is that when the air temp coming out of the vents is close to the same as the room, the volume of air does not feel like it does when it is 20 degrees colder. The temperature drop across your skin is a stronger sensation than the airflow.

The blower motor may well be having issues. You could swap the red and black wires and see if anything changes.
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Old 08-13-2011, 08:21 PM   #20
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Blower Motor Wiring reversed?


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Originally Posted by HVACMac View Post
2.5 tons ruud, air grille= 18"x12", both air filter removed, no change.

Thats too small for a 2.5 ton system. Its only good for about 1 ton.
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Old 08-13-2011, 08:35 PM   #21
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Blower Motor Wiring reversed?


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Originally Posted by beenthere

Thats too small for a 2.5 ton system. Its only good for about 1 ton.
I see you have never been to Florida
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Old 08-13-2011, 09:20 PM   #22
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Blower Motor Wiring reversed?


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I see you have never been to Florida

LOL... Actually, I have been there. ROFL.
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Old 08-13-2011, 09:52 PM   #23
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Blower Motor Wiring reversed?


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Originally Posted by beenthere View Post
Thats too small for a 2.5 ton system. Its only good for about 1 ton.
How do you do this calculation? I thought 18"x12" would be good for 1300 CFM, 2.5 ton
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Old 08-13-2011, 10:04 PM   #24
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Blower Motor Wiring reversed?


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Originally Posted by Master of Cold View Post
What jj is saying is that when the air temp coming out of the vents is close to the same as the room, the volume of air does not feel like it does when it is 20 degrees colder. The temperature drop across your skin is a stronger sensation than the airflow.

The blower motor may well be having issues. You could swap the red and black wires and see if anything changes.
I do understand what jj is saying and agree to a certain point. Sensation is only part of the diagnosis. What I am failing to communicate is the actual airflow IS a wisp. I have these bright orange plastic 1/4" x 8" long streamers hanging from the bdrm registers. I can not only feel the lack of airflow I can see it too! Limp as a dish rag. I mean, you'd think hi speed blowing would stiffen these streamers straight out.
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Old 08-13-2011, 10:16 PM   #25
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Blower Motor Wiring reversed?


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Originally Posted by beenthere

Thats too small for a 2.5 ton system. Its only good for about 1 ton.
CORRECTION

Remeasured, duct is 15" dia. Covered by rectangular grill.
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Old 08-13-2011, 10:22 PM   #26
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Blower Motor Wiring reversed?


that silver covered HONEYWELL is the fan/hi limit for the heating side...i got it .......they wired the hi speed into the heat limiter and the low speed into that black relay.test this shut the stat off system and fan in auto...go down pull that silver cover and turn it clock wise and tell use what speed the fan comes on.like i said the ON/AUTO on the subbase is cooling fan control only the heat "high limit" and fan on/off are threw that silver limit control during the winter..the speed wires have to be backwards....are the round fins on the fan squirrel clean of dirt dust crap run your index finger along them
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Old 08-13-2011, 10:41 PM   #27
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Blower Motor Wiring reversed?


Is that blower motor original, looking at the hp rating on the motor it might be a little light for 2.5 tons of air.
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Old 08-14-2011, 12:23 AM   #28
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Blower Motor Wiring reversed?


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Originally Posted by biggles
that silver covered HONEYWELL is the fan/hi limit for the heating side...i got it .......they wired the hi speed into the heat limiter and the low speed into that black relay.test this shut the stat off system and fan in auto...go down pull that silver cover and turn it clock wise and tell use what speed the fan comes on.like i said the ON/AUTO on the subbase is cooling fan control only the heat "high limit" and fan on/off are threw that silver limit control during the winter..the speed wires have to be backwards....are the round fins on the fan squirrel clean of dirt dust crap run your index finger along them
Woohoo, thx biggles!! Glad the pics posted were of some use. I'll give it try, let's hope your idea works! I'll be right on it in the morn.

Yes, one of the 1st things I did. Pulled the blower squirrel cage out and clean it. I also peeked into- top of the evaporator, looks generally clean.
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Old 08-14-2011, 12:24 AM   #29
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Blower Motor Wiring reversed?


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Originally Posted by SKIP4661
Is that blower motor original, looking at the hp rating on the motor it might be a little light for 2.5 tons of air.
Have no idea, came w/ house ten yrs ago.
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Old 08-14-2011, 05:53 AM   #30
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Blower Motor Wiring reversed?


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How do you do this calculation? I thought 18"x12" would be good for 1300 CFM, 2.5 ton
For a 300FPM velocity. L * W * 1.6 = CFM

A 12X20 Hart&Cooley #650 return filter grille is listed as 343 CFM at 300 FPM, 457 CFM at 400 FPM, 571 CFM at 500 FPM, 685 CFM at 600 FPM, and 800 CFM at 700 FPM.


A filter grille is not suppose to have air going through it at duct velocity.

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