Honeywell RM7895C1012 Control Modules
Configured for burner management and flame safety safeguarding in commercial heating appliances, the Honeywell RM7895C1012, also cataloged as the RM7895C1012 Burner Control Unit, operates as a dedicated microprocessor-based relay module for 120 VAC 50/60 Hz burner applications.
Suffix Breakdown & Model Matrix
- RM7895C1012: Base model designation for the 7800 Series relay module featuring prepurge timing, interrupted pilot operation, and selectable interlock configurations.
- 7800 Series: Honeywell microprocessor-based burner control platform supporting plug-in programmer modules and keyboard display modules.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7895C1012 |
| Brand | Honeywell |
| Origin | USA / Global Manufacturing Facility |
| Weight | 2.12 lbs (0.96 kg) |
| Dimensions | 5.0 in x 5.0 in x 5.0 in (standard 7800 chassis form factor) |
| Operating Temp | -40 deg C to +60 deg C |
| Power Consumption | 10 W max |
| Operating Voltage | 120 VAC (+10%, -15%), 50/60 Hz |
| Flame Establishing Period | 4 s or 10 s pilot; 10 s main flame |
| Nonvolatile Memory | EEPROM fault storage and lockout history |
Relay Module Safety Execution and Interlock Logic
The module governs burner sequencing operations through micro-controller supervision, enforcing mandatory prepurge timing, interrupted pilot cycles, and delayed main valve actuation. Internal safety logic continuously monitors selectable interlock circuits, air flow switches, and limit controls to ensure instantaneous fail-safe state execution upon detecting flame loss or pressure anomalies. Nonvolatile EEPROM memory logs fault history codes and diagnostic cycles, isolating transient system errors from permanent lockout conditions.
Frequently Asked Questions
Q: Can the Honeywell RM7895C1012 module be replaced while the burner subbase is energized?
A: No. Main electrical power to the burner control subbase must be completely isolated and locked out prior to removing or inserting the relay module to prevent electrical shock or relay chatter damage.
Q: How is pilot flame establishing timing configured?
A: Pilot flame establishing periods are configured via selectable jumper settings or plug-in programming keys supported within the 7800 Series architecture.
Q: What action does the module take upon a flame signal loss during running cycles?
A: The internal safety circuit initiates an immediate safety shutdown, closing fuel valves and entering a nonvolatile lockout state within 4 seconds of flame signal disappearance.
Field Installation Guidelines
- Power Isolation: Turn off all main 120 VAC power feeds supplying the burner management panel before handling the control chassis.
- Static Control: Wear an approved anti-static wrist strap connected to earth ground when handling the microprocessor module card.
- Subbase Seating: Align the RM7895C1012 module guide pins with the Honeywell wiring subbase and press straight down firmly until the plug-in terminals mate fully. Secure the front chassis retaining screw.
- Wiring and Grounding: Ensure the subbase earth ground terminal is connected to a low-impedance earth ground rod to maintain electrical noise immunity and safe flame amplifier operation.
Honeywell RM7895C1012 Control Modules
Honeywell RM7895C1012 Control Modules
Configured for burner management and flame safety safeguarding in commercial heating appliances, the Honeywell RM7895C1012, also cataloged as the RM7895C1012 Burner Control Unit, operates as a dedicated microprocessor-based relay module for 120 VAC 50/60 Hz burner applications.
Suffix Breakdown & Model Matrix
- RM7895C1012: Base model designation for the 7800 Series relay module featuring prepurge timing, interrupted pilot operation, and selectable interlock configurations.
- 7800 Series: Honeywell microprocessor-based burner control platform supporting plug-in programmer modules and keyboard display modules.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | RM7895C1012 |
| Brand | Honeywell |
| Origin | USA / Global Manufacturing Facility |
| Weight | 2.12 lbs (0.96 kg) |
| Dimensions | 5.0 in x 5.0 in x 5.0 in (standard 7800 chassis form factor) |
| Operating Temp | -40 deg C to +60 deg C |
| Power Consumption | 10 W max |
| Operating Voltage | 120 VAC (+10%, -15%), 50/60 Hz |
| Flame Establishing Period | 4 s or 10 s pilot; 10 s main flame |
| Nonvolatile Memory | EEPROM fault storage and lockout history |
Relay Module Safety Execution and Interlock Logic
The module governs burner sequencing operations through micro-controller supervision, enforcing mandatory prepurge timing, interrupted pilot cycles, and delayed main valve actuation. Internal safety logic continuously monitors selectable interlock circuits, air flow switches, and limit controls to ensure instantaneous fail-safe state execution upon detecting flame loss or pressure anomalies. Nonvolatile EEPROM memory logs fault history codes and diagnostic cycles, isolating transient system errors from permanent lockout conditions.
Frequently Asked Questions
Q: Can the Honeywell RM7895C1012 module be replaced while the burner subbase is energized?
A: No. Main electrical power to the burner control subbase must be completely isolated and locked out prior to removing or inserting the relay module to prevent electrical shock or relay chatter damage.
Q: How is pilot flame establishing timing configured?
A: Pilot flame establishing periods are configured via selectable jumper settings or plug-in programming keys supported within the 7800 Series architecture.
Q: What action does the module take upon a flame signal loss during running cycles?
A: The internal safety circuit initiates an immediate safety shutdown, closing fuel valves and entering a nonvolatile lockout state within 4 seconds of flame signal disappearance.
Field Installation Guidelines
- Power Isolation: Turn off all main 120 VAC power feeds supplying the burner management panel before handling the control chassis.
- Static Control: Wear an approved anti-static wrist strap connected to earth ground when handling the microprocessor module card.
- Subbase Seating: Align the RM7895C1012 module guide pins with the Honeywell wiring subbase and press straight down firmly until the plug-in terminals mate fully. Secure the front chassis retaining screw.
- Wiring and Grounding: Ensure the subbase earth ground terminal is connected to a low-impedance earth ground rod to maintain electrical noise immunity and safe flame amplifier operation.
