Product Overview
The RM7890B1048 relay module is a microprocessor-based integrated burner control . It handles single burner on/off applications for gas, oil, coal, or combination fuels . This advanced digital control provides flame supervision, system diagnostics, and automatic burner sequencing . It includes a valve proving feature to test seat integrity before each start .
Key Specifications
| Parameter | Specification |
|---|---|
| Model | RM7890B1048 |
| Type | 7800 Series Relay Module |
| Input Voltage | 120 Vac (+10%, -15%) |
| Frequency | 50/60 Hz (±10%) |
| Power Dissipation | 10W maximum |
| Max Total Load | 2000 VA |
| Weight | 0.8–0.9 kg |
| Dimensions (W x H x D) | 127 x 127 x 133 mm (with Q7800A subbase) |
| Operating Temperature | -40°C to +60°C |
| Storage Temperature | -40°C to +66°C |
| Humidity | 85% RH max, non-condensing |
| Vibration Limit | 0.5G max |
| Pilot Type | Intermittent |
Hardware & Connectivity
The RM7890B1048 system consists of the relay module, a Q7800 subbase, and a plug-in flame amplifier . Five LEDs provide sequence and status information at a glance . The module connects to the Q7800A or Q7800B universal wiring subbases . It supports interchangeable amplifiers including R7847, R7848, R7849, R7851, R7852, R7861, or R7886 models .
Memory & Safety Features
Nonvolatile memory retains history files and sequencing status even after a power loss . The valve proving system checks the integrity of safety shutoff valves before ignition . Blinking LED fault annunciation provides rapid troubleshooting guidance . This module is SIL 3 capable in a properly designed safety instrumented system .
Environmental Compliance
This unit carries approvals from UL, FM, Swiss Re, and meets FCC Class B emissions standards . It operates reliably in demanding industrial environments, from -40°C to +60°C. The module requires a vertical mounting position for optimal thermal performance . Install the unit where relative humidity never reaches the saturation point .
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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