This microprocessor-based relay module provides primary burner control for single-burner industrial applications. It manages semi-automatically fired gas, oil, coal, or combination fuel systems with advanced safety features. The module integrates flame supervision, self-diagnostics, and system status indication into one compact unit.
Core Functionality and Sequence Control
The Honeywell RM7885A1015 operates on 120 Vac (+10/-15%) at 50/60 Hz (±10%) and dissipates a maximum of 10W power. It supports a maximum total connected load of 2000 VA with 15A fusing protection. The module establishes the pilot flame within 10 seconds while the main flame remains intermittent. Five front-panel LEDs provide clear sequence status information for operators. Nonvolatile memory retains flame signal data even during power loss.
Technical Specifications
| Specification | Detail |
|---|---|
| Model | RM7885A1015 |
| Product Type | Relay Module / Burner Controller |
| Voltage | 120 Vac (+10%, -15%) |
| Frequency | 50/60 Hz (±10%) |
| Power Dissipation | 10W maximum |
| Max Connected Load | 2000 VA |
| Fusing | 15A max, Type S/C or equivalent |
| Pilot Flame Period | 10 seconds |
| Main Flame Type | Intermittent |
| Pilot Type | Intermittent |
| Dimensions (Q7800A subbase) | 127 × 127 × 133 mm |
| Dimensions (Q7800B subbase) | 127 × 127 × 155 mm |
| Weight | 0.8 kg to 1.2 kg |
| Operating Temperature | -40°C to +60°C |
| Storage Temperature | -40°C to +66°C |
| Humidity | 85% RH non-condensing |
| Vibration Tolerance | 0.5G environment |
| Approvals | UL, CSA, FM, FCC Class B, SIL 3 capable |
Application Flexibility and Compatibility
This module supports torch-ignited burners, electrically ignited pilots, and conventional knee or foot-operated start stations. For continuous firing or modulating rate applications, the module adapts seamlessly. A shutter drive output and flame signal check during standby further enhance operational safety. The device provides a dedicated terminal for external alarm activation upon flame failure. It works with Q7800A/B subbases and various amplifiers including R7847, R7848, R7849, R7851, R7861, and R7886.
Environmental Ratings and Certifications
This module operates reliably across a wide temperature range from -40°C to +60°C and stores safely from -40°C to +66°C. It withstands humid environments up to 85% RH non-condensing and tolerates vibration levels up to 0.5G. The device holds UL, CSA, FM, and FCC Class B approvals, and it meets SIL 3 capability standards for functional safety. These certifications confirm its suitability for demanding industrial burner management systems.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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