Definition and Function:
A combination of a relay and a start capacitor used to help start a struggling compressor.
Not typically installed by manufacturers to lower costs, often added after initial installation.
Need and Usage:
Installed based on system evaluation by a technician, considering load, compressor type, and metering device.
Commonly used when the compressor strains to start.
Sometimes installed during initial setup if deemed necessary by the technician.
Operation:
The relay senses the input signal from the contactor and activates the start capacitor to boost the compressor start.
Once the compressor starts, the relay stops the start capacitor.
Provides additional torque, helping the system handle residual refrigerant in the line.
Sizes and Selection:
Common sizes: 1.5 to 3 ton, 3.5 to 5 ton, and less than 1 ton (appliance-sized).
Select based on system tonnage; do not substitute with a more powerful kit than needed.
Designed to give a little extra power to reduce unnecessary wear on the compressor.
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