The original compressor-heatpump starting issue is documented at Air-conditioner fan & compressor fails to start. I installed a new capacitor before the technician arrived.
The HVAC technician immediately suspected and removed:
and installed what seems to be a SUPCO SPP6 Relay/Capacitor Hard Start Kit:
I think technician measured the currents and used compressor the LRA / RLA to replace. CERA-MITE device.
I assume (please challenge if not correct) that the SUPCO SPP6 increases drives the starter such that starting torque is increased. I understand that it somehow reduces the transient starting current, so as to avoid blowing out fuses.
- Do the devices serve the same function? How are they different (if at all)?
- Are either of these devices simply supplemental capacitors to augment the charge available to start the compressor?
- Is does the booster augment the voltage, charge or both to increase the starting torque?
- How does the SPP6 reduce the starting current, while (I assume) increasing starting torque?
- What exactly does the compressor RLA=23.5 (Rated Load Amps) indicate?
- and LRA=105 (Lock Rotor Amps) indicate?
- How do I know (test) if the compressor is on "final approach" or that this is just a routine parts replacement (heat pump is older: unknown age but in the range of 12-25 years).