Description
The Packard PR9169 is a potential (voltage) relay designed to assist single-phase hermetic and semi-hermetic compressors in achieving a fast, reliable start. Featuring a 332V coil pickup voltage, this relay works in conjunction with a start capacitor to boost starting torque, then drops the capacitor out of the circuit once the compressor motor reaches operating speed — protecting both the capacitor and the motor windings from prolonged start current.
How It Works
Potential relays sense the back-EMF (counter electromotive force) generated by the compressor’s start winding as the motor accelerates. When the back-EMF reaches the relay’s pickup voltage (332V), the normally-closed contacts open and remove the start capacitor from the circuit. This precise switching action ensures a smooth, efficient start every time.
Key Features
- 332V coil pickup voltage for accurate start-winding sensing
- Normally-closed contact design — opens on motor acceleration
- Compatible with single-phase hermetic compressor applications
- Compact, industry-standard form factor for easy installation
- Designed for use with external start capacitors in hard-start applications
- Packard quality construction for long service life in demanding HVAC/R environments
Typical Applications
- Residential and light commercial air conditioning compressors
- Heat pump compressors requiring hard-start assistance
- Refrigeration compressors with single-phase motors
- Replacement of failed or weak OEM potential relays
Installation Notes
Always verify the coil voltage rating matches the back-EMF specification of the compressor being serviced. Consult the compressor nameplate or manufacturer’s data sheet to confirm compatibility before installation. Disconnect all power before servicing electrical components.
Reviews
There are no reviews yet.