MB-685S Fireye Control

Overview

The Fireye MB-685S is a specialized multi-burner control system designed to manage the start-up sequence and monitor the flames of up to 20 individual gas, oil, or combination fuel burners connected to a common valve train. As a fully integrated, microcomputer-based control, it consolidates sequential logic and safety circuitry into a single module. The MB-685S is functionally identical to the standard MB-600S model but is specifically equipped with the MB-685M motherboard, which provides RS-485 communication capabilities for remote monitoring and interfacing.

Features

• Controls and monitors up to 20 individual burners using expansion modules.
• RS-485 communication via the MB-685M motherboard for industrial networking.
• Dynamic on-board diagnostics to identify faulty relays, air switch shorts, and specific burner failures.
• Plug-in modular design allowing for individual replacement of the relay, logic, and power modules.
• On-board DIP switches for easy configuration of sequence and timing to meet specific application needs.
• Support for various flame sensing technologies, including UV, UV self-check, and flame rod.

Specifications

• Model Number: MB-685S
• Supply Voltage: 120 VAC (+10%, -15%), 50/60 Hz
• Power Consumption: 25 VA
• Flame Failure Response Time (FFRT): 3 seconds (+/- 0.5 seconds)
• Pilot Trial for Ignition: Selectable 5, 10, or 15 seconds
• Purge Time: Selectable from 0 to 225 seconds or up to 60 minutes with extension
• Operating Temperature: -40 degree F to +140 degree F (-40 degree C to +60 degree C)
• Agency Approvals: UL recognized (US and Canada) and FM approved

Applications

The MB-685S is engineered for the industrial process heat market, making it ideal for large-scale combustion systems. Common applications include industrial furnaces, ovens, and multi-burner plants where precise start-up sequencing and reliable flame monitoring are critical for safety and operational efficiency. It is particularly used in systems requiring remote data acquisition or integration into a larger plant control network via RS-485.