Burner management systems require robust switching and safety functions. The Honeywell RM7840G1014 delivers reliable relay-based control for commercial burners. This module functions as a flame safeguard relay for the 7800 Series. Honeywell designed this unit for gas, oil, and combination fuel applications.
Technical Specifications & Dimensions
This relay module provides switching for burner sequence and safety functions. The table below outlines its core technical parameters.
| Parameter | Specification |
|---|---|
| Power Supply | 120V AC, 50/60 Hz |
| Flame Detection Types | Rectification or UV scanner |
| Pre-purge Timing | Programmable (15 to 600 seconds) |
| Trial for Ignition | Programmable (2 to 15 seconds) |
| Flame Failure Response | 4 seconds maximum |
| Lockout Type | Manual reset required |
| Relay Contact Rating | 10A at 120V AC resistive |
| Pilot Valve Output | 1.0A maximum |
| Main Valve Output | 2.0A maximum |
| Operating Temperature | -40°F to +140°F (-40°C to +60°C) |
| Unit Weight | 0.65 kg (1.43 lbs) |
| Dimensions (WxHxD) | 135 x 110 x 75 mm |
Construction and Interface Layout
This module features a rugged plastic housing with a clear status window. Such a design protects internal relays while showing operational status. Furthermore, the Honeywell RM7840G1014 provides a front-accessible terminal strip for wiring. You will find 18 screw terminals on this interface. Each terminal accepts wire sizes from 0.2 to 2.5 mm². LED indicators show power, flame, and lockout status clearly.
Energy Storage and Relay Switching
Unlike solid-state controls, this unit uses heavy-duty electromechanical relays. The board includes small capacitors for contact arc suppression. Consequently, the Honeywell RM7840G1014 switches inductive loads like valve coils reliably. A synchronous motor-driven cam assembly sequences the relay operations. This mechanical design provides precise timing without a microprocessor. The module does not require any batteries for configuration storage.
Installation and Mounting Requirements
Installing the Honeywell RM7840G1014 takes only a few minutes of work. The unit mounts directly onto a standard 4×4 inch junction box. It also supports panel mounting using the four corner holes. Always disconnect 120V power before wiring this module. The unit uses passive cooling through ventilation slots. This design eliminates fan noise and moving parts. Allow adequate clearance for wire bending and access.
Integration with Burner Systems
This relay module works perfectly with 7800 Series burner controls. It interfaces with flame detectors, ignition transformers, and gas valves. Operators can perform a manual reset after any safety lockout condition. The Honeywell RM7840G1014 also provides separate outputs for pilot and main valves. Consequently, this module remains a reliable choice for burner system repairs. The unit delivers consistent performance across a -40°F to +140°F temperature range.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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