Honeywell RM7895A1014 On-Off Primary Burner Controller
Configured for burner management and flame safeguard execution in commercial combustion applications, the Honeywell RM7895A1014, also cataloged as the RM7895A1014 Burner Control Unit, operates as a microprocessor-based relay module for 120 VAC 50/60 Hz burner systems.
Suffix Breakdown & Model Matrix
- RM7895A1014: Base model designation for the 7800 Series on-off primary burner controller featuring intermittent pilot operation and purge timer card compatibility.
- 7800 Series: Honeywell microprocessor-based burner control platform utilizing plug-in flame amplifiers, purge timers, and universal wiring subbases.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7895A1014 |
| Brand | Honeywell |
| Origin | USA / Global Manufacturing Facility |
| Weight | 1.95 lbs (0.90 kg) |
| Dimensions | 5.0 in x 5.0 in x 5.25 in (127 mm x 127 mm x 133 mm with Q7800A Subbase) |
| Operating Temp | -40 deg C to +60 deg C (-40 deg F to +140 deg F) |
| Power Consumption | 10 W max |
| Operating Voltage | 120 VAC (+10%, -15%), 50/60 Hz |
| Flame Establishing Period | 4 s or 10 s pilot; intermittent main flame |
| Prepurge Timing | Determined by ST7800A plug-in purge timer card |
| Required Components | Q7800A,B Subbases; R78xx Flame Amplifier; ST7800A Purge Timer |
Relay Module Safety Execution and Interlock Logic
The module governs burner sequencing operations through internal microcontroller supervision, coordinating mandatory prepurge cycles and intermittent pilot ignition. Safety interlock circuits are continuously monitored to ensure immediate fail-safe state execution, shutting down fuel valves within milliseconds upon detecting airflow loss or flame signal disappearance. Nonvolatile memory and diagnostic LED annunciation log fault history codes for troubleshooting and regulatory compliance.
Frequently Asked Questions
Q: Can the Honeywell RM7895A1014 module be replaced while the wiring subbase is energized?
A: No. Main electrical power feeding the burner control subbase must be completely disconnected and locked out prior to removing or inserting the relay module to prevent electrical shock or relay damage.
Q: How is the prepurge time interval determined for this controller?
A: The prepurge timing is established directly by installing an ST7800A plug-in purge timer card into the designated slot on the front of the relay module.
Q: What flame signal amplifiers are compatible with the RM7895A1014?
A: The unit accepts standard 7800 Series plug-in amplifiers including R7847, R7848, R7849, R7851, R7852, R7861, and R7886 models depending on the flame sensor type.
Field Installation Guidelines
- Power Isolation: Turn off all primary 120 VAC power feeds supplying the burner management panel before servicing or installing the control module.
- Static Protection: Wear an approved anti-static wrist strap connected to cabinet earth ground while handling the electronic chassis card.
- Subbase Seating: Align the RM7895A1014 module guide pins precisely with the Q7800 wiring subbase slots and press downward evenly until the plug-in connector pins seat completely. Secure the front mounting screw.
- Grounding and Shielding: Verify that the subbase chassis is securely bonded to a low-impedance earth ground to maintain electrical noise immunity and stable flame detector operation.
Honeywell RM7895A1014 On-Off Primary Burner Controller
Honeywell RM7895A1014 On-Off Primary Burner Controller
Configured for burner management and flame safeguard execution in commercial combustion applications, the Honeywell RM7895A1014, also cataloged as the RM7895A1014 Burner Control Unit, operates as a microprocessor-based relay module for 120 VAC 50/60 Hz burner systems.
Suffix Breakdown & Model Matrix
- RM7895A1014: Base model designation for the 7800 Series on-off primary burner controller featuring intermittent pilot operation and purge timer card compatibility.
- 7800 Series: Honeywell microprocessor-based burner control platform utilizing plug-in flame amplifiers, purge timers, and universal wiring subbases.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7895A1014 |
| Brand | Honeywell |
| Origin | USA / Global Manufacturing Facility |
| Weight | 1.95 lbs (0.90 kg) |
| Dimensions | 5.0 in x 5.0 in x 5.25 in (127 mm x 127 mm x 133 mm with Q7800A Subbase) |
| Operating Temp | -40 deg C to +60 deg C (-40 deg F to +140 deg F) |
| Power Consumption | 10 W max |
| Operating Voltage | 120 VAC (+10%, -15%), 50/60 Hz |
| Flame Establishing Period | 4 s or 10 s pilot; intermittent main flame |
| Prepurge Timing | Determined by ST7800A plug-in purge timer card |
| Required Components | Q7800A,B Subbases; R78xx Flame Amplifier; ST7800A Purge Timer |
Relay Module Safety Execution and Interlock Logic
The module governs burner sequencing operations through internal microcontroller supervision, coordinating mandatory prepurge cycles and intermittent pilot ignition. Safety interlock circuits are continuously monitored to ensure immediate fail-safe state execution, shutting down fuel valves within milliseconds upon detecting airflow loss or flame signal disappearance. Nonvolatile memory and diagnostic LED annunciation log fault history codes for troubleshooting and regulatory compliance.
Frequently Asked Questions
Q: Can the Honeywell RM7895A1014 module be replaced while the wiring subbase is energized?
A: No. Main electrical power feeding the burner control subbase must be completely disconnected and locked out prior to removing or inserting the relay module to prevent electrical shock or relay damage.
Q: How is the prepurge time interval determined for this controller?
A: The prepurge timing is established directly by installing an ST7800A plug-in purge timer card into the designated slot on the front of the relay module.
Q: What flame signal amplifiers are compatible with the RM7895A1014?
A: The unit accepts standard 7800 Series plug-in amplifiers including R7847, R7848, R7849, R7851, R7852, R7861, and R7886 models depending on the flame sensor type.
Field Installation Guidelines
- Power Isolation: Turn off all primary 120 VAC power feeds supplying the burner management panel before servicing or installing the control module.
- Static Protection: Wear an approved anti-static wrist strap connected to cabinet earth ground while handling the electronic chassis card.
- Subbase Seating: Align the RM7895A1014 module guide pins precisely with the Q7800 wiring subbase slots and press downward evenly until the plug-in connector pins seat completely. Secure the front mounting screw.
- Grounding and Shielding: Verify that the subbase chassis is securely bonded to a low-impedance earth ground to maintain electrical noise immunity and stable flame detector operation.
