Honeywell Self check UV amplifier R7886A1001/U

The Honeywell R7886A1001/U is a self-check UV amplifier designed for use with Honeywell 7800 series relay modules. It monitors flame detectors and internal electronic components 12 times per minute, triggering a safety shutdown via compatible relay modules (7800 and R7140 series) in case of malfunction. The amplifier measures flame signal intensity from 0 to 5.0 V and connects to the relay module via an edge connector configured for its own orientation. It includes flame signal control sockets for voltage measurement. Physical specifications: weight 70 g, dimensions 91 mm (width) x 85 mm (height) x 23 mm (thickness), operating ambient temperature range -40 to 60 °C.

When selecting a replacement amplifier of this type, ensure compatibility with the existing relay module series (e.g., 7800 or R7140) and verify the amplifier's orientation configuration matches the mounting. Check the physical dimensions and weight to fit the existing enclosure, and confirm the ambient temperature range suits the installation environment. The amplifier must be connected via the edge connector to the relay module, so verify the connector type and alignment.

Typical failures of this kind of amplifier include loss of flame signal detection or false shutdowns. Symptoms may include the burner failing to start, intermittent flame loss, or the system locking out with an error code. Check the flame signal voltage at the test sockets, inspect the UV detector and wiring, and verify the amplifier's self-check function operates correctly by observing the check frequency.