FieldBench

Bryant

880TA

Furnace · Evolution 80% · two-stage · metal vent

Bryant Evolution 80% two-stage (current 880TA; 355CAV is the older Infinity-80 badge twin of Carrier 58CVA). Category I metal vent. No PVC collector. 31 is chimney/inducer, never a 96% trap. 355CAV door cards are an older IFC generation — confirm THAT sticker.

Not 926T / 916S condensing. A 31 here is metal-vent draft. Not 800S Legacy single-stage 80% (no ABCD). Not 987M.

Maker PDFs

Walk this in Diagnose

This plate

AFUE
80% · Category I metal vent
Staging
Two-stage gas · two-speed inducer · metal-vent draft switch
Bus
Evolution ABCD on communicating SKUs

This board

Evolution / two-digit IFC (80% metal vent)

  • 13/33 limit, 14/34 ignition, 31 draft, 24 fuse — same numbers as 96% Bryant boards, different vent.
  • No secondary condensate path. Do not dump a ‘trap’ that is not there.
  • 355CAV / 355MAV older variable 80% — similar metal-vent 31, different IFC generation. Read that door card.

Sequence

  1. Low. Inducer → metal-vent prove → HSI → low fire. 31 if the chimney will not prove.
  2. High. High fire, still Category I. Wind and shared chimneys show up here.

Faults on this IFC

  • 24

    Fuse

    warn

    24 V fuse.

    • ABCD miswire, HUM, valve.
  • 31

    Draft / PS

    lockout

    Metal vent will not prove. Not a 96% trap.

    • Chimney liner, cap, common-vent tables, inducer wheel.
    • PS hose to the inducer housing can hold flue condensate on a long metal run — still Cat I.
  • 33 / 13

    Limit

    warn

    Airflow. 80% A-coils still dirty.

    • Filter, coil on top, blower, Evolution heat CFM. Rollout manual reset.
  • 34 / 14

    Ignition

    lockout

    HSI / gas / rod.

    • Fix 31 draft before a fair 34 test.
  • ABCD

    Communication

    lockout

    Wall control or outdoor dropped (communicating SKUs).

    • A/B/C/D, polarity, C, no 24V on D.

Workflows

31 on 880TA / 355CAV

Do not cut a condensate trap.

  1. This furnace has no secondary drain. Look at the metal vent and the inducer wheel.
  2. Common-vented water heater: venting table / liner, not a switch.
  3. Then the PS hose on the inducer housing.

Test points

Vent
Cat I tables. Spillage at the draft hood / inducer inlet is a fail.

Gotchas

  • 355CAV is the older Bryant Infinity 80 you will see in basements. 880TA is the current Evolution 80. Same metal-vent 31 idea; confirm the door card.
  • Carrier 58CVA is the factory twin of 355CAV.

Related plates

  • carrier-58cva — Carrier Infinity 80 factory twin of 355CAV.
  • bryant-800s — Legacy 80% single-stage 24V. Same metal vent, no Evolution bus.
  • bryant-926t — Preferred 96. A 31 there is PVC/trap, not a chimney.