trane condenser - Is that a hard start kit?
The black cylinder is the start CAPACITOR. The white relay just above it is the start RELAY. Together they make up what some term a "start kit", and certainly not a "compressor saver".
They can be replaced, of course. You should replace both items at the same time. Generally you can get exact replacements at most well stocked HVAC houses.
However, if the unit does not have a start kit, and the compressor has no trouble starting, there is no reason to install a hard start kit.
Last edited by scottmcd9999; 07-19-2012 at 02:17 PM.
Reason: addl text