HONEYWELL TK-PRR021

Description

Product Description

HONEYWELL TK-PRR021 is a Power Supply and Relay Module or a Power Regulator/Relay Interface for a Honeywell control system, most likely for a Fire Alarm Control Panel (FACP) or a Critical Building Management System (BMS) node. This module is not a PLC CPU but a vital support component that provides conditioned power and relay-based output control. The primary function of the HONEYWELL TK-PRR021 is to perform two critical roles: 1) to convert and regulate incoming AC or DC power to the stable voltages required by the system’s logic boards, and 2) to provide multiple Form-C (SPDT) relay outputs for controlling external devices such as fans, dampers, door locks, or notification appliances (horns, strobes) based on commands from the main controller. The reliability of this combined power and relay unit is essential for the overall availability and functional execution of the safety or control system.

Product Parameters / Technical Specifications

• Manufacturer: Honeywell (Building Technologies or Fire & Security Division)
• System: Honeywell Fire Alarm (e.g., Notifier, Gamewell-FCI) or BMS Panel
• Functional Designation: Power Supply & Relay Module / Power Regulator Relay
• Input Voltage: Accepts a primary power source, typically 120/240VAC, and may also accept a 24VDC battery input for backup.
• Output Voltages: Provides one or more regulated DC output voltages (e.g., 24VDC, 5VDC) to power the system’s control modules, detectors, and logic circuits.
• Relay Outputs: Contains multiple electromechanical relays, often Form-C (SPDT) contacts, rated for specific resistive or inductive loads (e.g., 5A @ 30VDC, 2A @ 120VAC).
• Relay Control: Relays are energized/de-energized by low-voltage control signals from the main system CPU.
• Supervision & Diagnostics: Monitors the health of the power supply (AC fail, battery low) and may provide fault reporting for relay coil or contact status.
• Mounting: Designed as a slide-in or fixed module within a proprietary panel enclosure.
• Certifications: Likely carries critical safety certifications such as UL 864 (for fire alarm control units) and may be UL 508 listed for industrial control.

Advantages and Key Features

• Integrated Design: Combines critical power regulation and high-current switching in a single, system-approved module, simplifying panel design and wiring.
• High Reliability for Life Safety: As a component in potential life-safety systems, the HONEYWELL TK-PRR021 is engineered for extreme reliability and fail-safe operation, often with built-in supervision of its own functions.
• Robust Relay Outputs: The electromechanical relays provide true physical isolation and can switch a wide range of voltages (AC/DC), making them ideal for interfacing with diverse building equipment directly from the low-voltage control system.
• Supervised Power Path: Monitors primary and backup power sources, providing system alerts for power failures to ensure backup batteries are engaged as required.
• Seamless System Integration: Designed to plug directly into the panel’s backplane or dedicated connectors, ensuring reliable communication with the main controller and correct current rating for the system’s load.

Application Cases in Industry

• Fire Alarm Control Panel (FACP) Power & Control: A primary application. The TK-PRR021 provides regulated power to the FACP’s CPU and detector loops, and its relays control HVAC shutdown (smoke control), elevator recall, door release, and fan activation as part of the fire safety plan.
• Building Automation System (BAS) Integration: Used in a BMS panel to power the controller and execute physical commands via relays, such as starting/stopping pumps, opening/closing valves, or locking/unlocking doors based on schedules or alarms.
• Critical Notification Appliance Circuit (NAC) Power: In some designs, may provide the power for or directly drive notification devices like horns and strobes.
• Industrial Monitoring & Control: Can be used in custom industrial panels where a reliable, supervised power source and isolated relay outputs are required for machine safety interlocks or process shutdowns.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Verify Exact System Compatibility: The HONEYWELL TK-PRR021 must be listed for use with your specific fire alarm or BMS panel model (e.g., Notifier NFS-320, Honeywell WEBs). Using an incompatible module can violate the system’s listing and cause operational failure.
2. Understand the Replacement Context: Is this a spare for an existing panel, or for a new installation? For spares, the part number must match the failed unit exactly. For new panels, it must be on the approved parts list from the system design.
3. Relay Load Rating Verification: Before connecting field devices, verify the relay contact ratings (voltage, current AC/DC, inductive/resistive) on the TK-PRR021 and ensure your connected loads (contactors, solenoid valves) are within specifications. Overloading will destroy the relay contacts.
4. Strict Electrical Safety Procedures: Installation or replacement involves live AC mains and battery connections. Follow all lockout/tagout (LOTO) procedures. Only qualified personnel should perform this work.
5. Battery Backup Consideration: If the module handles battery backup, ensure the replacement procedure includes proper handling and connection of the sealed lead-acid batteries, observing correct polarity.
6. Sourcing from Authorized Life-Safety Distributors: This is potentially a life-safety component. Purchase the TK-PRR021 only from authorized Honeywell Fire or Building Solutions distributors. They can guarantee the part is genuine, certified, and suitable for your specific system. Using gray-market parts can have legal and safety implications.

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