Honeywell R7849A1023 7800 Series Flame Amplifier

The Honeywell R7849A1023, also cataloged as the R7849A1023 Ultraviolet Flame Amplifier, operates as a dedicated hardware component for flame signal detection and evaluation within 7800 SERIES Relay Module platforms. Configured to respond to input signals generated by external ultraviolet sensors, the solid-state plug-in module converts dynamic flame radiation into a standardized 0.0 to 5.0 Vdc signal path. The hardware interfaces directly with the primary safety control module through a keyed printed circuit board edge connector to enforce flame failure response timing during burner operation.

Hardware Specifications

Process Control & Fieldbus Interface Characteristics

The R7849A1023 incorporates dedicated analog signal processing circuitry engineered to isolate low-level ultraviolet sensor inputs from external electromagnetic interference. Featuring front-accessible flame signal test jacks, the module allows non-intrusive measurement of the 0.0 to 5.0 Vdc signal voltage using standard multimeter probes. Onboard channel-to-channel isolation components prevent high-voltage ignition noise from corrupting internal logic lines, maintaining precise timing execution across safety shutdown loops.

Frequently Asked Questions

Q: How does the physical edge connector prevent improper alignment during insertion into a 7800 Series Relay Module?

A: The printed circuit board edge connector is mechanically keyed to match slot orientation on the host 7800 Series Relay Module, preventing inverted or misaligned insertion.

Q: What measurement devices are compatible with the front panel flame signal test jacks?

A: A standard high-impedance DC voltmeter with a minimum 1 megohm/volt rating can be connected directly to the test jacks to monitor the 0.0 to 5.0 Vdc signal voltage.

Q: Can the R7849A1023 amplifier be inserted or removed while the host 7800 Series Relay Module is powered?

A: No, line power to the 7800 Series Relay Module must be disconnected before installing or removing the amplifier card to prevent board-level electrical damage.

Field Installation Guidelines

• Power Isolation: Disconnect all main electrical power supplies feeding the 7800 Series Relay Module before attempting module insertion or extraction.
• Key Alignment & Insertion: Align the keyed edge connector of the R7849A1023 with the designated amplifier slot on the relay module base and press firmly until fully seated.
• Sensor Wire Routing: Route ultraviolet flame sensor leads in dedicated, grounded metal conduit separated from high-voltage ignition transformer cables by at least 100 mm.
• Shield Grounding Practice: Connect sensor cable shields to specified panel ground terminals while keeping shield drains isolated at the sensor end to avoid ground loops.
• Signal Voltage Check: After burner ignition, insert meter leads into the front test jacks to verify a stable flame signal voltage output between 1.25 and 5.0 Vdc under full load.