Author Topic: Slow running fan  (Read 3348 times)

Offline shovel52

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Slow running fan
« on: June 04, 2009, 03:11:29 PM »
This spring when I turned my window  unit on it was dead. I cleaned the terminals of the
capacitor which is a 40 for the compressor and a 5 for the fan and tried it again,
and it did come on but the fan is running slow. It doesn't appear to be running warm or making any type of noise and the motor is not stiff. I have tried 3 different 5 micro farad caps on the fan but none make any difference. Also the fan has 3 speeds and switching the control knob makes no difference in the speed. I don't think I have any wires switched. The fan has a brown and red wire coming from the motor and i have those going to the 5 micro farad cap. the compressor has a red and white going to the 40, which is in the same can.
The brown from the fan and white from the compressor  share the same common terminal on the can. Also the motor seems to be running backwards. Shouldn't the blades blow through the condenser coil and out the back? It is not, it sucks air in. Anyone?

Model ar1800xw0

Offline Icehouse

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Re: Slow running fan
« Reply #1 on: June 04, 2009, 03:57:33 PM »
The fan is blowing correctly, however sounds like a voltage problem. The capacitor is like giving it a "push" to get going.
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Offline jumptrout51

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Re: Slow running fan
« Reply #2 on: June 04, 2009, 09:00:34 PM »
Both brown wires from the fan motor should go to the 5 mfd cap.
The red wire from the fan could go to the common on the 40 mfd cap.
The other wires from the fan motor would go to the speed control.
I am sure RM will correct me.
Take a Kid fishing.

Offline JWWebster

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Re: Slow running fan
« Reply #3 on: June 04, 2009, 09:37:19 PM »
Can you post any pictures?
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I love fan letters! LOL

Offline Repair-man

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Re: Slow running fan
« Reply #4 on: June 05, 2009, 05:33:43 AM »
Both brown wires from the fan motor should go to the 5 mfd cap.
The red wire from the fan could go to the common on the 40 mfd cap.
The other wires from the fan motor would go to the speed control.
I am sure RM will correct me.


Yes, I am in a correcting mood :)
The red wire goes to the COM terminal on the capcitor, as does the L2 wire back to the  control panel. The brown wire goes on the capacitor terminal marked FAN. What this person is not telling you is that the other 3 wires, BLK, BLU, and ORG also connect to the back of the motor and go to the speed control.

The motor must turn such that the air is sucked in the side intakes and discharged thru the back away from the house. If it will not change speed or the direction is wrong, replace the motor. You should not separate the capacitors if possible, but get the proper 3-terminal one made for the unit!

For more info, see the following:

Tech Sheet for AR1800
« Last Edit: June 05, 2009, 05:39:02 AM by Repair-man »
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Offline JWWebster

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Re: Slow running fan
« Reply #5 on: June 05, 2009, 10:31:30 AM »
You could remove the orange (lo speed) and blue (med speed) wires and put them where they wont short against anything and run it on high. If it speeds up then it probably is a bad switch. Jimbo is right the motor has a red wire for common(weird) and mounts on the dummy post of the fan switch along with L2.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline Icehouse

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Re: Slow running fan
« Reply #6 on: June 05, 2009, 10:58:39 AM »
 >:( Another instance when manufacturer's fail to follow a standard wiring code, but again this from the same company that owns and uses the Brazilian Nightmare "Embraco".  :P
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline Repair-man

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Re: Slow running fan
« Reply #7 on: June 05, 2009, 11:07:25 AM »
You could remove the orange (lo speed) and blue (med speed) wires and put them where they wont short against anything and run it on high. If it speeds up then it probably is a bad switch. Jimbo is right the motor has a red wire for common(weird) and mounts on the dummy post of the fan switch along with L2.

Or, you could just jumper the black wire from the motor to the L1 side where the cord feeds the selector switch. If the fan does run on high speed, the switch is bad.


Ice, a lot of these were also made with LG parts.
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Offline Icehouse

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Re: Slow running fan
« Reply #8 on: June 05, 2009, 12:23:21 PM »
 :) I meant that they are not conforming to standard wiring color codes but they also use those garbage compressors.
Hey "Copeland" who always bragged about made in the USA now has them made in Poland  :'( :'(
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline jumptrout51

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Re: Slow running fan
« Reply #9 on: June 05, 2009, 01:11:01 PM »
His explanation led me to believe he was using 2 caps not a dual cap.
He said he changed out the 5 mfd 3 times.
He also said he has 2 brown wires, which normally would be power in power out for a single cap.
And yes the red(com) wire would go to L2.
I could not find a diagram myself. Just giving info from logic of most systems.
I am with JW...send me a picture of this weirdo.
Take a Kid fishing.

 

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