Configured for continuous UV flame sensing validation in 7800 Series Safeguard Controls, the Honeywell R7861A1026 (R7861A Flame Signal Amplifier) provides direct physical/electrical execution of dynamic self-check safety monitoring.

Order Code Matrix & Physical Variant

The R7861A1026 belongs to the R7861A dynamic self-check amplifier series. It installs directly into the card guide assembly of a 7800 Series Relay Module via printed circuit board edge connectors. The unit interfaces with C7061A or C7061F dynamic self-check ultraviolet flame detectors, driving the shutter mechanism while reading flame signal voltage.

Technical Performance Parameters

Process Safeguard & Signal Isolation Integrity

Operating on Honeywell 7800 Series burner management systems, the module interfaces directly with a 4-20 mA HART loop protocol environment through system supervisory cards. It drives the shutter circuit of dynamic self-checking UV scanners 12 times per minute to continuously verify sensing tube response, providing channel-to-channel isolation that prevents false flame indication during electronic component failures.

Scope of Delivery

• 1 x Honeywell R7861A1026 Dynamic Self-Check Flame Signal Amplifier Module
• 1 x Product Instruction Sheet

Wiring & Mounting Procedures

• Power Interruption: Disconnect power supply before installing or removing the amplifier to prevent electrical shock or control unit damage.
• Orientation & Insertion: Align the circuit board edges with the guide slots inside the 7800 Series relay module and push firmly until the edge connector seats completely.
• Leadwire Routing: Run detector wiring in dedicated grounded metal conduit. Never run flame signal leadwires in the same conduit with high-voltage ignition cables.
• Shielding Rules: Ensure proper grounding of scanner shield lines at the control enclosure end only to avoid ground loop noise.

Frequently Asked Questions

• Q: What flame detectors are compatible with the R7861A1026 amplifier?

  A: The R7861A1026 is specifically designed to operate with Honeywell C7061A and C7061F dynamic self-check ultraviolet flame detectors.

• Q: Can the R7861A1026 be inserted or removed while the system is powered?

  A: No. Power must be completely disconnected from the 7800 Series relay module subbase prior to plugging in or extracting the amplifier card.

• Q: How is the flame signal voltage measured on this unit?

  A: Flame signal voltage ranges from 0.0 to 5.0 VDC and can be measured using a high-impedance DC voltmeter across the test jacks on the 7800 Series module front panel.

• Q: What is the typical flame failure response time for this module?

  A: The flame failure response time (FFRT) is 2.0 or 3.0 seconds, dictated by the specific 7800 Series relay module model selected.

• Q: How does the dynamic self-check function operate?

  A: The amplifier cycles an oscillating shutter inside the C7061 scanner 12 times per minute to simulate flame loss and test tube response continuously.

• Q: What causes the flame signal to fluctuate on the meter test jacks?

  A: Slight signal fluctuation occurs normally due to the periodic shutter interruption during dynamic self-check operation.

• Q: What is the operating temperature envelope for field enclosures?

  A: Ambient operating temperatures outside the module housing must remain between -40 deg C and 60 deg C (-40 deg F and 140 deg F).

• Q: Are special cables required between the detector and amplifier?

  A: Standard NEC Class 1 color-coded leadwires rated for operating temperature are used inside dedicated grounded metal conduit.