-
Compressor amperage
Last I checked, the 2~ compressor should draw amperage on common start run during startup, then the relay takes the start capacitor out after getting to a specific back emf(voltage) or starting amps.
Then you should only have common and run amperage. Other than bad relays what would cause amperage on the start winding during operation…. or is my thought process wrong? 😑
-
7 Replies
-
Depends on the compressor winding design and the start system design. If it’s a PSC wound compressor, they have to have a cap current feed to run.
-
Depending on what make compressor your working on, check the field component manual for the right relay, cap, overload and possible wiring of them. I always carried both the Copeland and Tecumseh pocket books for that. They give you cut out voltage design of the relays as well. All units with a run cap will have current flow on the start winding.
-
Right, it’s not a CSCR. It’s CSIR, like most refrigeration compressors. the start leg should not draw amperage.
-
Beef, what make and model compressor are we talking about?
-
See pic. 😁
-
That’s a Copeland PFV. That means it’s a capacitive start, permanent split capacitor motor. Yes you will have current flow on the start winding in run mode. It uses both a start and run capacitor.
The Start is a 914-008-51
Run is 914-037-10
relay is a 940-001-55
You can find all this in the electrical parts guide.
-
Finally found the digital copy of the Electrical Handbook
Log in to reply.