FieldBench

Bryant

280ANV

Heat pump · Evolution Greenspeed · inverter HP

Bryant Evolution inverter heat pump (factory twin of Carrier 25VNA4 / Greenspeed). Outdoor drive + ABCD. Faults are inverter/comm/sensor, not a contactor-and-cap story. 189BNV is a Preferred inverter cousin — weigh-in still applies; the wall control may not be full Evolution.

Not a 126BNA / 113A / 114A Comfort single-stage (contactor, dual cap, piston/TXV). Not a 926T furnace IFC. Do not charge it like a Comfort piston unit.

Walk this in Diagnose

This plate

Drive
Inverter scroll · variable capacity
Bus
Evolution ABCD to the wall control and indoor
Charge
Weigh-in + line-set. Superheat is not a 410A piston chart.
Sister
Carrier 25VNA4 · 189BNV Preferred inverter cousin

This board

Outdoor inverter + Evolution UI

  • Evolution thermostat events first.
  • Outdoor board / inverter LED for drive faults (overcurrent, discharge, comm). L5/L4-class on the drive.
  • No conventional Y1/Y2 staging — capacity is serial. There is no outdoor contactor to listen for.

Sequence

  1. Call. Wall control requests capacity. Indoor IFC sets CFM. Outdoor inverter ramps.
  2. Defrost. Inverter + IFC coordinate. A failed outdoor coil sensor looks like always iced or never defrosts.

Faults on this IFC

  • Comm

    ABCD / outdoor drop

    lockout

    Drive or bus.

    • ABCD, outdoor board power, inverter comms harness.
  • HPS / LPS

    Pressure protection

    lockout

    Still real on an inverter.

    • Coil, fan, charge by weigh-in — you do not ‘top off’ a Greenspeed.
  • Inverter

    Drive overcurrent / overheat

    lockout

    L5/L4-class faults on the drive.

    • Compressor to ground, heat sink, supply voltage. Weigh-in vs nameplate.

Workflows

No cool, Evolution HP

Fan indoor, outdoor silent.

  1. Stat event list. If it is a bus fault, do not gauge up yet.
  2. Outdoor powered? Inverter LEDs?
  3. Charge is weigh-in plus line-set. Superheat on a variable drive is not a 410A piston chart.
  4. Indoor must be Evolution (987M / 986T / matching fan coil). A 926T on this outdoor is the wrong control scheme on most jobs.

Test points

Charge
Recover and weigh. Nameplate + ounces/ft.
ABCD
Evolution pair. Not Y1/Y2.

Gotchas

  • Carrier 25VNA4 is the factory twin.
  • 189BNV is Preferred inverter — similar drive, not always full Evolution ABCD. Read that outdoor board.

Related plates

  • carrier-25vna4 — Carrier Infinity Greenspeed factory twin.
  • bryant-191van — Evolution inverter AC-only cousin — no RV, no defrost.
  • bryant-987m — Evolution modulating indoor commonly paired on this bus.
  • bryant-135san — Legacy single-stage AC — contactor + dual cap. Opposite of this inverter.