Product Details
The Honeywell RM7840L1018, also cataloged as the RM7840L 1018 Burner Control Module, operates as a dedicated hardware component for microprocessor-based burner primary safety control and sequence execution within industrial flame safeguard system platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7840L1018 / RM7840L 1018 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.7 kg (1 lb 10 oz) module |
| 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 Burner Program Control |
| PrePurge Period | Determined by ST7800A Purge Timer Card |
| PostPurge Period | Configurable / Model dependent |
| Flame Establishing Period | Pilot: 3 sec or 5 sec; Main: 3 sec, 5 sec, or Intermittent |
| Required Accessories | Q7800A/B Universal Subbase, ST7800A Timer Card, R78xx Flame Signal Amplifier |
| Approvals | UL Listed, FM Approved, CSA Certified |
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 modular components are required to complete an operational RM7840L1018 control assembly?
A: An operational assembly requires the RM7840L1018 module, a Q7800A or Q7800B Universal Wiring Subbase, an ST7800A Plug-in Purge Timer Card to set the pre-purge timing, and an R78xx series Flame Signal Amplifier module.
Q: How is pre-purge timing established on the RM7840L1018 module?
A: The pre-purge duration is dictated entirely by the hardware rating of the plugged-in ST7800A Purge Timer Card; 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 EEPROM memory to preserve all fault histories, lockout status codes, and operating sequence logs permanently through power interruptions without data degradation.
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
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