Results 1 to 6 of 6
Thread: copeland semi hermetic run on
-
27-01-2010, 09:35 PM #1
copeland semi hermetic run on
hi all..I am new to this site and am trying to get an answer to a weird situation.
I have a single phase compressor for a commercial refrigeration unit that continues to run briefly after shut down, and shakes a lot also. I've replaced the capacitors and potential relay, voltage is within rated and amp draw is also within rated..
During operations the unit is quiet and amp draw normal, start up amp draw normal also.
I am starting to think it may be due to worn bearings that allow crank shaft to shift upon de energizing voltage.....??????
Any one have any ideas?? any help would be great
thanks
-
27-01-2010, 09:56 PM #2
Re: copeland semi hermetic run on
Hi and welcome to the forum.
What type of compressor is it?
Some machines will run backwards during pressure equalization.Brian - Newton Abbot, Devon, UK
Retired March 2015
-
27-01-2010, 10:35 PM #3
Re: copeland semi hermetic run on
I would try turning it off by the main isolator to see if it still does it, i've seen faulty contactors and wiring faults do strange things.
If it still does it then maybe its a mechanical problem, maybe its snaped a rod or something.
I once had a condenser fan motor that run backwards for five seconds and off for ten then on again and this was due to faulty control circuit wiring.
Jon
-
28-01-2010, 01:50 AM #4
-
28-01-2010, 02:07 AM #5
Re: copeland semi hermetic run on
the compressor is shut down by contactor that controls one line of power.....second line is fed live at all times....the contactor is controlled by voltage from electronic controller....ive checked the contactor and contacts as well as voltage and all is checking out normally....this is what makes it a weird problem....
copeland semi hermetic....not sure of m/n at time of this reply...sorry
-
28-01-2010, 02:17 AM #6
Re: copeland semi hermetic run on
Last edited by powell; 28-01-2010 at 02:50 AM.
Thousands of HVACR manufacturers links! Visit: www.hvacrinfo.com
Similar Threads
-
oil level indication / sample port in hermetic compressor
By friocold2008 in forum Supermarket RefrigerationReplies: 8Last Post: 17-11-2009, 10:30 PM -
DC Hermetic Compressors
By riggsby in forum Air ConditioningReplies: 1Last Post: 18-01-2008, 06:19 PM -
do we need a hermetic or semi hermetic comp.?
By duraid in forum FundamentalsReplies: 14Last Post: 17-04-2007, 05:52 PM -
Hermetic reciprocating versus hermetic scroll
By Cofreth in forum Technical DiscussionsReplies: 26Last Post: 19-11-2005, 06:29 PM