Paragon 8145-20 Timer

The Paragon 8145-20 Defrost Timer is a heavy-duty commercial refrigeration control designed for time-initiated and temperature- or pressure-terminated defrost cycles. Operating at 240V AC 60Hz, this synchronous motor-driven switch is the industry-standard direct replacement for the S8145-20. It features a high-capacity 40-amp, 2-HP rated contact set, making it ideal for electric defrost heaters and hot gas solenoid applications in reach-ins and walk-in freezers. The time-initiated defrost cycle is adjustable from 4 to 110 minutes, providing precise control over evaporator coil clearance. Its durable NEMA 1 enclosure houses a positive-frequency vibration-resistant motor, ensuring reliable performance in demanding mechanical rooms. Technicians prefer the 8145 series for its fail-safe terminal configuration and the ability to integrate with remote temperature or pressure switches for exact termination, preventing unnecessary heat gain in the refrigerated space and maintaining strict cabinet setpoints.

• High Amperage Rating: Reliable 40-amp non-inductive switching handles heavy heater loads without contact welding.
• Universal Compatibility: Serves as the drop-in S8145-20 replacement for seamless field service upgrades.
• Flexible Defrost Scheduling: Supports 1 to 6 defrost cycles per day with minimum 4-hour intervals between starts.
• Fail-Safe Operation: Adjustable back-up timer ensures defrost termination even if the temperature or pressure switch fails to trip.
• Rugged Construction: Steel enclosure with knockouts simplifies conduit banking and protects internal components from debris.

Can I use the 8145-20 to replace a 120V model?
No, this unit is specifically rated for 240V clock motors. Applying 120V will result in timing inaccuracies or failure to cycle, while applying 240V to a 120V motor will cause immediate coil burnout.

How does temperature termination work on this model?
The Paragon 8145-20 uses a remote sensing thermostat or pressure switch wired to the solenoid coil. Once the evaporator reaches the preset temperature, the switch energizes the high-speed reset motor to end the defrost cycle instantly.

Is this compatible with hot gas defrost systems?
Yes, the SPDT switching logic allows for the management of compressor bypass and evaporator fan delay, provided the load does not exceed the 2-HP motor rating.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.