12 in stock
Honeywell RM7890B1048 Control Module
Honeywell RM7890B1048 Control Module
Brand/Manufacturer: Honeywell
Order Number: RM7890B1048
Type: Control Module
Country of Origin: Sweden
Condition: Original Brand
Lead Time: Available in stock
Payment Term: 100% TT In Advance
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Description
Configured for automatic burner sequence control and primary flame monitoring in 7800 SERIES combustion assemblies, the Honeywell RM7890B1048 (RM7890B1048 Burner Control Unit) provides direct physical/electrical execution. It mounts directly to a Q7800 wiring subbase to supervise intermittent pilot ignition, main flame establishing periods, safety interlock loops, and line-voltage fuel shutoff valve outputs.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7890B1048 |
| Brand | Honeywell |
| Origin | USA / Mexico |
| Weight | 3.00 lbs (1.36 kg) |
| Dimensions | 127 mm x 127 mm x 133 mm (with Q7800 subbase) |
| Operating Temp | -40 deg C to +60 deg C |
| Power Consumption | 10 W nominal |
| Supply Voltage | 120 VAC (+10%, -15%), 50/60 Hz |
| Memory Type | Nonvolatile Memory |
| Pilot Type | Intermittent |
| Pilot Flame Establishing Period | Fixed 4 s or 10 s |
Process Control and DCS Interface Features
The module provides channel-to-channel isolation between low-voltage micro-ampere flame detection circuits, internal microprocessors, and line-voltage switching relays. System status, real-time flame voltage telemetry, and historical lockout codes pass through the integrated serial ControlBus interface to supervisory DCS platforms or plant PLCs without causing signal degradation or introducing interference to critical safety trip loops.
Frequently Asked Questions
Q: What protection does the nonvolatile memory provide in the RM7890B1048?
A: Nonvolatile memory retains all critical lockout history, sequence execution status, and diagnostic operational fault data during a complete loss of primary input power.
Q: Is a separate plug-in purge card required to operate the RM7890B1048?
A: No, unlike purge-dependent 7800 SERIES modules, the RM7890B1048 operates as a non-purge burner control unit while still requiring a plug-in flame signal amplifier and Q7800 subbase.
Field Installation Guidelines
- Ensure all 120 VAC incoming line power feeds to the Q7800 wiring subbase are completely isolated before mounting or removing the module.
- Inspect the rear card-edge contacts to confirm terminals are aligned straight and clean prior to seating into the subbase receptacle.
- Push the module firmly onto the subbase and tighten the central captive retaining screws to prevent loose contact under operational industrial vibration.
- Route flame signal sensor lines and ControlBus communication cables in dedicated conduits separated by at least 150 mm from high-voltage ignition transformer leads.
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Testimonials
Fast Delivery, Excellent Quality
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
Reliable Partner for Original Parts
Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
- David Smith
Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
- David Smith
Professional Service with After-Sales Support"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
Trusted Source for Industrial Automation Spares
We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson
We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson