Technical Overview
The Honeywell RM7838A1014 is a microprocessor-based integrated burner control for semi-automatically fired single-burner applications. It handles gas, oil, coal, or combination fuel systems with exceptional safety and functional capability. This relay module replaces the older R4138A, B, C, and D models, though it does not include an override for momentary power interruptions. The complete system requires several additional components: a Q7800A or Q7800B wiring subbase, a compatible plug-in flame amplifier, and an ST7800A purge timer card.
The Honeywell RM7838A1014 delays fuel admission to the combustion chamber until the control proves the pilot flame. It then continuously monitors the main flame throughout the entire run period. Five LEDs provide clear sequence information on the front panel, and the included keyboard display module offers system status indication. A non-volatile memory retains fault history and lockout status even after a complete power loss. The pilot flame establishing period is selectable between 4 and 10 seconds, thereby offering application flexibility.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model Number | RM7838A1014 |
| Product Type | Burner Controller / Relay Module |
| Voltage | 120 Vac (+10/-15%) |
| Frequency | 50/60 Hz (±10%) |
| Power Dissipation | 10W maximum |
| Maximum Connected Load | 2000 VA |
| Fuse Rating | 15A maximum, Type SC Fast Blow |
| Pilot Flame Establishing Period | 4 or 10 seconds (selectable) |
| Main Flame Establishing Period | Intermittent |
| Pre-Purge | Determined by ST7800A Purge Timer Card |
| Post-Purge | 15 seconds |
| Operating Temperature | -40°C to +60°C (-40°F to +140°F) |
| Storage Temperature | -40°C to +66°C (-40°F to +150°F) |
| Humidity Rating | 85% RH continuous, noncondensing |
| Vibration | 0.5G environment |
| Dimensions (with Q7800A) | 127 x 127 x 133 mm |
| Dimensions (with Q7800B) | 127 x 127 x 155 mm |
| Weight | 0.7 kg (1 lb 10 oz) |
Key Features
Microprocessor-Based Safety – The advanced processor delivers a level of safety and functional capability beyond conventional controls.
Non-Volatile Memory – The module retains history files and lockout status after power loss, ensuring data persistence.
Selectable Pilot Timing – The 4 or 10-second pilot flame establishing period provides flexibility for different burner configurations.
Interchangeable Amplifiers – Plug-in flame amplifiers simplify field replacement and customization.
Keyboard Display Module – The integrated KDM provides system status indication and fault diagnostics.
Required Components
The Honeywell RM7838A1014 requires several separately purchased components: a Q7800A or Q7800B Universal Wiring Subbase, a compatible plug-in flame signal amplifier (R7847, R7848, R7849, R7851, R7852, R7861, or R7886), an ST7800A Plug-in Purge Timer Card, and a flame detector compatible with the chosen amplifier.
Applications
This burner controller excels in industrial combustion systems, including boilers, process furnaces, kilns, and heaters. It is particularly well-suited for power generation facilities, chemical processing plants, and manufacturing environments where semi-automatic burner sequencing is required.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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