Honeywell RM7850A1019 Relay Module Full Programming 120V CE Approved

RM7850A1019 | Honeywell Burner Control Relay Module 120V 15S PP

The Honeywell RM7850A1019 is an advanced microprocessor-based integrated burner control designed for industrial thermal applications. Please download the Honeywell RM7850A Installation Manual to review the terminal wiring diagrams and safety logic sequences before installation.

Technical Engineering Data

• Model Number: RM7850A1019
• Supply Voltage: 120 Vac (+10%/-15%) at 50/60 Hz frequency range
• Sequence Timing: 15-second fixed Post-Purge with LHL-LF/HF Proving logic
• Safety Rating: SIL 3 Capable for high-integrity Safety Instrumented Systems (SIS)
• Flame Establishing Period: 3s/5s for Pilot; 3s/5s or Intermittent for Main flame
• Power Dissipation: Relay module consumes 10W maximum; KDM adds 3W maximum
• Environmental Tolerance: Operating range from -40°C to +60°C (-40°F to +140°F)
• Vibration Resistance: Certified for 0.5G continuous vibration industrial environments
• Memory: Nonvolatile flash memory retains fault history and lockout status without power
• Approvals: CE (EN298), GASTEC (CE-63AP3070/1), Factory Mutual (J.I. OYOA9.AF)

Oiltech Controls’ Insight & Review

• The RM7850A1019 stands out for its internal “Run/Test” switch, allowing engineers to verify ignition sequences without external bypasses.
• We recommend this unit for high-output burners where LF/HF (Low Fire/High Fire) proving is a critical safety requirement.
• The modular architecture enables plug-in amplifiers to be swapped rapidly, reducing downtime during sensor technology upgrades.
• Field performance confirms that the die-cast construction handles industrial interference better than generic controllers.
• For rapid technical assistance, email info@oiltechcontrols.com or message WhatsApp: +86 158 8020 0923.

Target Equipment & Compatibility

• Forced draft gas and oil burners requiring European Community timing standards.
• Large-scale industrial boilers and thermal oxidizers with modulation requirements.
• Compatible with Q7800A/B wiring subbases and R7847/R7849/R7861 amplifiers.
• Replacement for legacy 7800 series modules in SIL-rated safety loops.
• Process furnaces utilizing intermittent pilot ignition sequences.

Order Logistics & Warranty

• Condition: 100% Brand new original Honeywell factory-sealed module.
• Warranty: Industry-standard 12-month full replacement warranty.
• Dispatch Time: Fast processing within 24-28 hours from order confirmation.
• Shipping Methods: Global express delivery via Fedex, UPS, and DHL.
• Packaging: Secure industrial-grade packaging to prevent ESD or transit damage.

Professional FAQ & Engineering Guide

• Q1: Is the RM7850A1019 compatible with 230V systems?
  No, the RM7850A1019 is strictly for 120V systems; using 230V will damage the internal circuits.
• Q2: How do I set the Pre-Purge time for this module?
  The pre-purge duration is not programmable; it is defined by the specific ST7800A Purge Timer Card you insert into the unit.
• Q3: What does the “LHL” designation mean for my burner?
  It stands for Low-High-Low, meaning the control proves both the low-fire and high-fire positions before proceeding with the sequence.
• Q4: Can I retrieve fault codes without the optional display module?
  While the five LEDs provide basic sequence status, the S7800 KDM display is required for detailed failure code history and diagnosis.
• Q5: Buying Tip: Does this include the wiring subbase?
  No, the RM7850A1019 is the relay module only. You must ensure you have a Q7800A or Q7800B subbase already installed or order one separately.

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