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HVACMac 08-13-2011 01:06 PM

Blower Motor Wiring reversed?
 
2 Attachment(s)
With the triple digits 100-115 temps out here in Oklahoma I've found the upstairs A/C cannot keep up with the heat. Herein lies problem as I see it. I think the blower motor is wired incorrectly. In the winter the air blowing out of the registers are far greater than in the summer. Its just a trickle in the summer. Not enough air is moving to adequately cool the upstairs. My downstairs unit, (separate A/C heating unit- top from bottom) blows a great amount of air. Filters have been cleaned, same goes for condensers fins outside-All cleaned.

Below are photos.

Here is what I have:
Three wires coming in and five wires coming out of the Blower motor. Here is how it's connected, also see pics below.

Three wires / Five wires (blower motor)
Red ------- Blue
Black ------ Black
White ----- White
____ ------ Red Capped
____ ------ Green connected to housing


On the blower motor is a label showing the wiring diagram.
Another label is found on the shroud or blower motor housing.

The 2nd photo shows how it is connected.

My question:

Does this connection confirm the blower motor is connected improperly, esp for summer use? In other words, as connected is this why in the summer the A/C air discharge is so light? Naturally, if it is incorrectly connected how do I then correct it?
Looking fwd to your help?
TIA,
Ron

biggles 08-13-2011 01:26 PM

cap the blue(that was connected to that power in red) and connect the 2 reds together RED is LOW for Heat............ Black is HI for cooling.now to see if the fan runs in hi speed shut the stat and only switch the FAN to ON should have the hi fan blowing...if not the heat and cool fan relays wires(Black/RED) within the furnace are backwards..:wink:you can't check LO fan with the heat from the stat because it cycles thru a time delayon that board in the furnace in the heating season not like the stat as FAN/ON from the subbase...lets hear back:whistling2:

JJboy 08-13-2011 01:29 PM

High speed on colling model
Med high speed or Med speed to heating mode

HVACMac 08-13-2011 02:16 PM

Quote:

if not the heat and cool fan relays wires(Black/RED) within the furnace are backwards..:wink:you can't check LO fan with the heat from the stat because it cycles thru a time delayon that board in the furnace in the heating season not like the stat as FAN/ON from the subbase...lets hear back:whistling2:
The pic posted shows two relays. I see a transformer, next to it is a small brown relay and above it to the right is a large aluminum Honeywell relay? Your thoughts?
http://imgs.inkfrog.com/pix/msmikee/relays.jpg

JJboy 08-13-2011 02:21 PM

Black wire should be connected in high speed on control board. Check also if A-coil is clean. Filter is clean.

Could be low on refrigerant. But you need hook up the gauges to check this

HVACMac 08-13-2011 02:42 PM

1 Attachment(s)
Quote:

Originally Posted by JJboy (Post 706421)
Black wire should be connected in high speed on control board. Check also if A-coil is clean. Filter is clean.

Could be low on refrigerant. But you need hook up the gauges to check this

Forgot to say, Freon is fine. All filters are clean. A-Coil has been is cleaned. As to "black wire to control board" thats a big unknown to me, Have no idea where to even look.


Ron

JJboy 08-13-2011 02:55 PM

To make sure your AC is running ok, you need to get the temp at the return and just after the a-coil. If the temp difference is under 15 you have some problem. If not, It's insulation problem.

HVACMac 08-13-2011 03:16 PM

Quote:

Originally Posted by JJboy (Post 706447)
To make sure your AC is running ok, you need to get the temp at the return and just after the a-coil. If the temp difference is under 15 you have some problem. If not, It's insulation problem.

Hey Jj, thx. I think that is way beyound my limited expertise. A month or so ago a HVAC man did check the freon levels and found them to be fine. He check temps using his gauges. But, not sure what he was referencing. Ron

JJboy 08-13-2011 03:38 PM

I'm in Texas. I know it's hard to keep inside the house cold when outdoor temp is 105-110. I think your AC is running ok. You have to leave your AC running all night to remove all the heat. :thumbsup:

HVACMac 08-13-2011 04:02 PM

I hear that! TX was nearly as hot as us.
The downstairs unit really can keep the first floor cold AND it really can blow air. While upstairs the A/C has to contend with the attic heat and the evaporator/Furnace/ducts are all in the attic too! So its hot all around. Not surprised its struggling with 105+ degrees. Worse, temps are even hotter in the attic.
But, what concerns me, is the low volume of air coming out of the registers. Doesn't make sense to me and is why Im posting hoping to find an answer or least some direction before I call the A/C man. Ron

JJboy 08-13-2011 04:18 PM

Assuming that AC is okay. It's just a sensation that air is not flowing properly during hot days. I bet this ends during normal days. This is the same thing when AC is low of refrigerant.

HVACMac 08-13-2011 04:25 PM

Exactly. Where Iam stumped is the volume of air I am NOT getting as compared to downstairs. Downstairs air rushes out from every register with great volume. Upstairs is only a whisper. I' am wondering maybe a faster RPM motor is needed?

Master of Cold 08-13-2011 04:29 PM

I guess you missed post #2..

beenthere 08-13-2011 04:36 PM

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.

JJboy 08-13-2011 04:39 PM

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 )


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