Paragon B877-20 Timer

The Paragon B877-20 is a specialized program module designed for precise defrost control in commercial refrigeration systems. Operating at 208-240V AC 60 Hz, this even half-hour circuit module features an integral solenoid termination, allowing for instantaneous transfer when energized by an external pilot device like a thermostat or pressure switch. Engineered for heavy-duty industrial environments, the module utilizes a synchronous motor to drive the timing mechanism, ensuring reliable defrost initiation up to 12 times per day. The mechanical defrost termination is fully adjustable from 6 to 106 minutes, providing technicians with the flexibility to fine-tune cycles based on specific evaporator load requirements. With two SPDT snap switches rated at 10 Amps and 1/3 HP, the B877-20 offers robust switching capacity for compressors and defrost heaters. Its slip-in design allows for rapid field replacement within the frame without disturbing existing program settings or disassembling the entire timer assembly.

Key Benefits

• Solenoid-Actuated Termination: Enables immediate defrost termination via external temperature or pressure controls for improved system efficiency.
• High-Frequency Scheduling: Supports 1 to 12 daily operations with a minimum 2-hour interval between successive defrost cycles.
• Universal Component Compatibility: Designed for seamless integration into the Paragon RM series multi-circuit frames and 8000 series systems.
• Field Serviceability: Features 3/16-inch male push-on terminals and a spring-loaded clip bar for fast installation and maintenance.
• Industrial Grade Durability: Built with a sealed, permanently lubricated gear train to withstand rigorous commercial freezer and refrigerator applications.

Common Questions

How do I set the defrost duration on the B877-20?
The duration is controlled by the 2-hour dial on the program module. You can manually adjust the mechanical termination from 6 to 106 minutes in one-minute increments by positioning the trippers at the desired intervals.

What is the purpose of the solenoid in the B877-20 module?
The solenoid facilitates "demand defrost" termination. While the timer initiates the cycle, the solenoid allows an external sensor to end the defrost period instantly once the coil is clear, preventing unnecessary heat gain in the refrigerated space.

Can this module replace an older B848-20 unit?
Yes, the B877-20 is a direct functional replacement for the B848-20 and is compatible with existing RM series drive motors and frames, provided the 240V power requirements are met.

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.