Honeywell Analytics 301-EM-RFSA-US3 Controller

The Honeywell Analytics 301-EM-RFSA-US3 Controller is a high-performance multi-gas detection system engineered for demanding mechanical rooms and industrial refrigeration plants. This Type 3 US configuration features an integrated horn and strobe for immediate local notification, ensuring compliance with ASHRAE 15 and B52 safety standards. Designed to manage up to 20 remote sensors, it supports Modbus RS-485 and 4-20mA communication for seamless integration into existing BAS or PLC networks. The unit utilizes dual infrared technology for precise refrigerant leak detection (0-1000 ppm) across common fluids like R134A, R22, and R123, alongside electrochemical sensing for CO and NO2 monitoring. With four DPDT 5A relays and a wide operating temperature range down to -40°F, this controller provides robust gas mechanical room safety. It serves as the direct replacement for legacy models M-512428, VA301EM-RFSA, and VA301EM-RFSA-20.

Key Benefits for Technicians:

• Universal Compatibility: Monitors toxic and combustible gases including R11, R12, R123, R125, R404A, and R507 via a decentralized network.
• Industrial Build: Enclosed in a NEMA 1 housing with a backlit LCD display and multi-color status indicators for real-time diagnostics.
• Reduced Wiring Costs: Supports a transmission distance of up to 500 feet, allowing for centralized control of distant sensing points.
• Safety Redundancy: Features a built-in 65 dBA audible alarm and visual strobe to maintain regulatory compliance in cold storage and pharma labs.
• Simplified Maintenance: Standardized 6-month calibration intervals and 20 ppm relay differentials prevent nuisance tripping and simplify service calls.

Common Questions & Technical Support:

Does this controller support Modbus communication for remote monitoring?
Yes, the 301-EM-RFSA-US3 utilizes RS-485 Modbus protocol, allowing contractors to pull data points directly into a master controller or SCADA system.

Can I use this for ASHRAE 15 compliance in mechanical rooms?
Standard refrigerant monitoring applications require localized audio-visual alarms; this controller includes the necessary horn and strobe to meet typical safety code requirements.

How many sensors can be connected to a single 301-EM unit?
The system is designed to manage up to 20 individual sensing zones, making it ideal for large-scale facilities like cold storage or agricultural warehouses.

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.