Honeywell RM7895B1013 Control Relay

The Honeywell RM7895B1013, also cataloged as the RM7895B1013 Burner Control Unit, operates as a dedicated hardware component for safety sequence execution and continuous airflow monitoring within 7800 SERIES burner control systems. The module mounts directly onto a standard wiring subbase to manage intermittent pilot ignition, dynamic airflow switch verification, selectable interlock safety loops, and line-voltage fuel valve outputs.

Hardware Specifications

Process Control and DCS Interface Features

The module relies on high-integrity channel-to-channel isolation between low-voltage flame sensor inputs, internal control microprocessors, and line-voltage load outputs. Integrated ControlBus communication capabilities permit live transmission of sequence states, flame signal voltage values, and historical lockout diagnostic codes directly to supervisory plant DCS networks and Honeywell automation architectures without introducing signal noise or safety circuit loading.

Frequently Asked Questions

Q: What is the function of the dynamic airflow check on the RM7895B1013?

A: The dynamic airflow check continuously monitors the state of the airflow switch during burner sequence execution, verifying that the switch opens upon shutdown and closes during air proved sequence phases.

Q: Is the dust cover removable on the RM7895B1013 module?

A: Yes, the protective dust cover shields internal relay components and dip switches from airborne dust and debris, but can be accessed during subbase installation and configuration.

Field Installation Guidelines

1. Disconnect all 120 VAC power lines feeding the Q7800 subbase before mounting or removing the relay module.
2. Verify subbase terminal block connections against the site schematic to ensure proper load polarity and wiring integrity.
3. Push the module firmly onto the subbase receptacle until card-edge contacts engage completely, then tighten the captive retaining screws.
4. Keep low-voltage flame signal cables and ControlBus communication wiring separated from high-voltage ignition leads by at least 150 mm to avoid noise interference.