The Honeywell RM7898A1018, also cataloged as the RM7898A1018 Burner Control Unit, operates as a dedicated hardware component for automatic burner sequencing and flame supervision within 7800 Series platforms. This relay module executes pre-ignition, valve proving system (VPS) logic, selectable pilot type control, and early spark termination routines over a 120 VAC supply line.
Hardware Specifications
Parameter
Specification
Model
RM7898A1018
Brand
Honeywell
Origin
Industrial Automation Standard
Weight
1.36 kg (3.00 lbs)
Dimensions
Standard 7800 Series Module Footprint
Operating Temp
-40 deg C to +60 deg C
Power Consumption
120 VAC, 50/60 Hz
System Platform
7800 Series
Pilot Flame Establishing Period
4 or 10 Seconds (Selectable)
Integrated Features
VPS, Selectable Interlocks, Pre-ignition, Early Spark Termination
Channel Isolation and Dynamic Protocol Characteristics
The module utilizes channel-to-channel isolation and structured bus communication parameters across its backplane interface layer. In process automation topologies, electrical isolation prevents common-mode interference from compromising readout accuracy during flame sequence transitions. The module incorporates internal signal filtering and cold junction compensation algorithms within the host burner control architecture to maintain real-time diagnostic reporting during supply voltage fluctuations or high-frequency ignition noise.
Frequently Asked Questions
Q: What input power source does the RM7898A1018 module require for standard operation?
A: The relay module operates on a nominal line supply of 120 VAC at 50/60 Hz.
Q: What options are available for the Pilot Flame Establishing Period (PFEP)?
A: The module supports field-selectable pilot flame establishing timing periods of either 4 seconds or 10 seconds.
Field Installation Guidelines
Turn off all line power to the burner management enclosure before inserting the RM7898A1018 into the subbase.
Ensure the subbase terminal connections are torqued properly and inspect the backplane header pins prior to seating the module.
Keep high-voltage ignition transformer leads isolated from low-voltage field sensor and interlock wiring to minimize electromagnetic interference.
Verify proper continuous equipment grounding to the enclosure chassis bus bar before restoring system supply voltage.
