ac humming

Reply

  #1  
Old 09-15-05, 06:04 AM
qtip
Visiting Guest
Posts: n/a
ac humming

here is my problem. air in house is hot. Went outside and unit has a low humming sound. Blade does not turn. Any advise?
 
Sponsored Links
  #2  
Old 09-15-05, 12:09 PM
DNT1
Visiting Guest
Posts: n/a
A lot of units use a dual capacitor which controls both the condensor fan and compressor if niether the fan nor compressor is running when the thermostat is calling for cooling and unit is producing a humming sound it is likely the capacitor, replace it and report back.
 
  #3  
Old 09-15-05, 06:59 PM
qtip
Visiting Guest
Posts: n/a
a friend came by and we checked unit. We took panel off and pushed a switch and unit started. he said the problem is relay switch. Is this the same thing as a capacitor? Also cannot find name of unit. All it says is, SUPER HIGH EFFICIENCY 7000. On inside it says by INTER-CITY PRODUCTS? HELP!!!!
 
  #4  
Old 09-15-05, 08:06 PM
DNT1
Visiting Guest
Posts: n/a
Well if it was the contactor that he pushed and the unit came on, it is technically a electromechanical relay does it look like this? http://toad.net/~jsmeenen/contactor.html
 
  #5  
Old 09-18-05, 05:46 PM
Sambolino
Visiting Guest
Posts: n/a
Unhappy Fan problems with outside unit

I'm encountering similar problems. When the system calls for cooling, the outside unit 'hums' and the fan blades don't spin. If I start the blades spinning, all is well and the unit operates just fine. So, I'm guessing it's not the fan motor but the 'switch' that starts the fan motor. Is this a capacitor issue?
 
  #6  
Old 09-18-05, 07:43 PM
DNT1
Visiting Guest
Posts: n/a
Big S yours sounds like a capacitor problem check out this site for some capacitor info might help you locate yours http://www.yorkcapacitor.com/products-motor%20run.html
 
  #7  
Old 09-19-05, 05:14 AM
mattison's Avatar
Member
Join Date: Mar 2003
Location: Cinti, OH
Posts: 5,549
Received 0 Votes on 0 Posts
qtip

You need to get a voltage reading on the control side of the contactor to verify whether or not you have 24 volts present.
 
  #8  
Old 09-19-05, 06:21 AM
Sambolino
Visiting Guest
Posts: n/a
Start vs. run

Thanks DNT1 and mattison! I'm expecting (when I open up the unit) to find a bulging capacitor. Since I can get the unit cooling by manually turning the fan blades (before the compressor cuts off), is this a 'start' cap issue?
 
  #9  
Old 09-20-05, 05:25 AM
mattison's Avatar
Member
Join Date: Mar 2003
Location: Cinti, OH
Posts: 5,549
Received 0 Votes on 0 Posts
Sambo,

Your problem indeed sounds like a capacitor. Make sure you turn off the power to the unit before getting in there and dischage the capacitor by shorting across its terminals with a well insulated screwdriver before touching it.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: