Product Details
The Honeywell RM7850A1019, also cataloged as the RM7850A 1019 Burner Control Module, operates as a dedicated hardware component for microprocessor-based burner primary safety control within industrial flame safeguard system platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7850A1019 / RM7850A 1019 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.7 kg (1 lb 10 oz) module; 2.0 kg shipping weight |
| Dimensions | 127 mm x 127 mm x 133 mm (with Q7800A Subbase) / 155 mm deep (with Q7800B Subbase) |
| Operating Temp | -40 deg C to +60 deg C (-40 deg F to +140 deg F) |
| Power Consumption | 120 Vac (+10%, -15%), 50/60 Hz (+/-10%) |
| Application | Microprocessor-Based Industrial Burner Programming Control |
| PrePurge Period | Determined by ST7800A Purge Timer Card |
| PostPurge Period | 15 sec |
| Flame Establishing Period | Pilot: 3 sec or 5 sec; Main: 3 sec, 5 sec, or Intermittent |
| Required Accessories | Q7800A/B Subbase, ST7800A Timer Card, R78xx Flame Signal Amplifier |
| Approvals & Directives | CE (EN298), FM (J.I. OYOA9.AF), FCC Part 15 Class B, GASTEC CE-63AP3070/1 |
Advanced Signal Isolation & Flame Loop Protection
Integrated with cold junction compensation (CJC) concepts for thermal stability and channel-to-channel isolation parameters, the device conditions raw flame detector voltages via interchangeable plug-in amplifiers (R7847, R7849, R7861, or R7886). The internal control logic continuously performs 4-20 mA HART loop protocol diagnostics and status evaluations during pre-purge, ignition sequence, and main flame operation. Nonvolatile EEPROM memory retains running history files and safety lockout status across full power loss events without requiring battery backup maintenance.
Frequently Asked Questions
Q: What required modular accessories must be installed for the RM7850A1019 to operate?
A: The module requires a Q7800A or Q7800B Universal Wiring Subbase, an ST7800A Plug-in Purge Timer Card to set the pre-purge duration, and a compatible R78xx series Flame Signal Amplifier (R7847, R7849, R7861, or R7886).
Q: How is the purge time programmed or altered on this burner control module?
A: The pre-purge duration is entirely dictated by the hardware rating of the plug-in ST7800A Purge Timer Card selected; changing purge timing requires swapping the physical timer card on the main unit interface.
Q: What happens to sequence records and fault diagnostics during a total AC power loss?
A: The unit utilizes internal nonvolatile memory to preserve all fault histories, lockout status codes, and operating logs permanently through power interruptions without data loss.
Field Installation Guidelines
- Mount the module onto either a standard Q7800A or Q7800B universal subbase using the provided retaining screws, verifying 5-thread mechanical engagement prior to applying torque.
- Route high-voltage ignition leads in a dedicated metallic conduit isolated from low-voltage signal wires and flame detector sensor wiring to suppress EMI interference.
- Verify that terminal ground connections achieve low-impedance bond directly to the burner housing frame according to industrial field wiring standards.
- Ensure external test points remain accessible for voltage verification before energizing the 120 Vac input feed.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Comprehensive Guide to Instrumentation and Control (I&C) Design Basis
Instrumentation and Control (I&C) Design Basis serves as the foundational technical document for modern plant engineering. Project teams rely on this master specification to govern engineering deliverables across front-end engineering design (FEED) and detailed execution phases. A well-constructed I&C design basis ensures seamless integration among field instrumentation, safety systems, and main control systems. Furthermore, establishing clear technical standards early mitigates execution risks and prevents costly re-engineering during plant commissioning.
The Shift to Flexible IO Modules in Modern Industrial Automation
Traditional control systems rely on dedicated Input Output (IO) cards for industrial automation. Each conventional module processes a single signal type, such as Digital Input (DI), Digital Output (DO), Analog Input (AI), or Analog Output (AO). A standard 16-channel card accepts only one specific channel type across all ports. This inflexible hardware design often creates severe engineering bottlenecks during project execution. Engineers frequently must install entirely new cards to accommodate a single extra sensor. Consequently, late design changes increase control cabinet space requirements and drive up project costs.
DCS Commissioning Steps in Industrial Automation Projects
Commissioning a Distributed Control System (DCS) represents a crucial milestone when deploying modern process automation infrastructure. Field engineers must execute systematic verification steps to transition complex control hardware from static installation to dynamic plant control. Proper commissioning ensures that controllers, I/O modules, network switches, and HMI software operate in strict compliance with engineering design specifications before introducing live process fluids.