Testing A Cera-Mite Start-Assist Capacitor

Discussion in 'HVAC Heating & Cooling' started by wc770, Dec 30, 2017.

  1. wc770

    wc770 New Member

    Joined:
    Dec 30, 2017
    Location:
    Georgia
    Hello. I have a Carrier heat pump on which the fan (outside unit) is not turning. There is a loud hum coming from the unit. The blades on the fan turn reasonable easy (about a 1/2 revolution with a medium force push). The capacitor tests out as possibly bad. I just have a basic multi-meter to test it with. So, I'm going to order one to replace it.

    But, the unit also has a Cera-Mite assist capacitor in it, as shown below. Is there a way to test one of these? Thanks.
    [​IMG]
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Isolate one lead of the capacitor, and short across the leads to discharge in case there is a residual charge.

    Hook up an ohmmeter across the 2 terminals. If there is a range switch, select high range ohms/kohms/megohms.. The meter should initially show a low resistance but climb to several megohms or infinity pretty quickly. An analog meter is nice for that, but digital should work too.

    There are multimeters now that can actually give you a measurement of the μF. The regular ohmmeter test just checks for gross problems.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. wc770

    wc770 New Member

    Joined:
    Dec 30, 2017
    Location:
    Georgia
    OK, I'll give that a try. Thanks for the help.
     
Similar Threads: Testing Cera-Mite
Forum Title Date
HVAC Heating & Cooling Testing 2nd stage furnace (jumper wire) Mar 5, 2021
HVAC Heating & Cooling Radon testing Sep 21, 2014
HVAC Heating & Cooling Propane leak testing Apr 8, 2014
HVAC Heating & Cooling Testing Gas Fireplace Dec 12, 2010
HVAC Heating & Cooling Testing for air pressure in a house. May 17, 2008

Share This Page