FieldBench
Models
Carrierac

26VNA1

Infinity inverter AC · Puron Advance (R-454B)

Current Infinity inverter air conditioner on R-454B (Puron Advance). A2L. Same ABCD drive idea as 24VNA6 — wrong refrigerant to recover as 410A.

Not 24VNA6 (R-410A Infinity inverter). Not 25VNA4 (HP). Not 26TPA8 (two-stage R-454B). Not 26SCA5 (Comfort contactor).

Diagnose this modelInstall notesBoard cross-refField wiring

Refrigerant

R-454B Puron Advance (A2L)

Drive

Inverter scroll · Infinity ABCD

Charge

Weigh-in on an R-454B machine + line-set

This board

Infinity inverter · R-454B

  • Infinity events + outdoor drive.
  • Nameplate R-454B. A 410A 24VNA6 charge chart is the wrong book.
  • No defrost — AC only.

Infinity last 10.

Universal swap

No universal

Carrier 26VNA1 outdoor. No furnace IFC universal. Replace the OEM outdoor control / contactor / drive by the silk.

Silk: 26VNA1

White-Rodgers

—

ICM

—

Honeywell

—
  • Indoor furnace universals (50A55, 50M56U, ICM282B, ICM2811, S9200U). This is not an IFC.
  • Do not ‘adapt’ a furnace board to an outdoor inverter, defrost PCB, or contactor.

After you pull the dead card

  1. 1Photograph the outdoor silk. Indoor 50A55 / ICM282B / S9200U do not belong here.
  2. 2Contactor units: replace the contactor / cap / HPS — there is no universal outdoor board.
  3. 3Inverter / communicating outdoors: OEM drive only. There is no White-Rodgers or ICM outdoor universal.

Field wiring

Written landings for Carrier 26VNA1. Not a factory schematic.

Infinity / Evolution inverter AC
ABCDR-454B · A2L

Four-wire communicating inverter air conditioner. Capacity is serial. No contactor, no dual cap, no reversing valve, no defrost.

Written circuit description only — FieldBench does not redraw maker schematics. Example: R to W closes on a heat call; verify 24V at W1 before you change the IFC.

Open manufacturer PDF

This indoor

Same ABCD as 24VNA6. R-454B plate.

ABCD only

Infinity or Evolution wall control plus a matching indoor.

Infinity / Evolution wall control

Four-wire ABCD. D is 24V hot, not Y.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot — not a cool call24V

Infinity / Evolution indoor

Same ABCD. Indoor CFM is serial. A Comfort 59SC5 does not belong here.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot24V

Outdoor communicating drive

ABCD (or the outdoor comm harness). No Y contactor. No dual cap.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot — still not Y24V

Outdoor line — inverter drive

208/230 into the drive. No contactor slam. DC bus can stay live after the disconnect.

  • L1Line to the driveLine
  • L2Line to the driveLine
  • GNDEquipment groundLine

Landing

  • DataStat A/Bindoor A/Boutdoor A/B

    Data pair. Not 24 VAC Y.

  • 24VStat Cindoor Coutdoor C

    24V common. Still required.

  • 24VStat Dindoor Doutdoor D

    24V hot. D is not Y.

  • LineL1 / L2drive

    208/230. No contactor.

Prove it

  • Wall-control event list first. Bus fault vs drive fault — do not gauge up on a comm code.
  • ABCD landing and polarity. C is still required at the wall control.

Do not

  • Do not land conventional Y on D and walk away.
  • Do not ohm a defrost sensor or an RV solenoid. That is 25VNA4 / 280ANV.
  • Do not change a dual run cap that is not in this cabinet.

Carrier 24VNA6 / 26VNA1 and Bryant 191VAN / 180B. 187B is Evolution two-stage on the same ABCD bus, not this inverter.

Sequence

  1. 1

    Call

    ABCD capacity request. Inverter ramps.

  2. 2

    Protect

    HPS / LPS / drive. No defrost.

Faults on this IFC

Step 1, then 2, then 3. Expected reading and the fail branch sit under each check.

Comm

ABCD / outdoor drop

lockout

Drive or bus. Wall control loses the outdoor.

  1. 1 Let it cool, then read the drive LED

    On Carrier 26VNA1 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. ABCD landing and polarity, outdoor board power, inverter comms harness.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. C still required at the wall control.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter. Indoor must be Infinity-capable. A 24ACC6-style indoor pairing is the wrong mental model.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

HPS / LPS

Pressure protection

lockout

Still real on an inverter.

  1. 1 Let it cool, then read the drive LED

    On Carrier 26VNA1 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Coil, fan, charge by weigh-in — you do not ‘top off’ a Greenspeed.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. Outdoor fan that is actually the inverter-driven fan, not a dual-cap PSC motor.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter. Do not use 24ACC6 piston superheat as the pass/fail.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

Inverter

Drive overcurrent / overheat

lockout

L5/L4-class faults on the drive.

  1. 1 Let it cool, then read the drive LED

    On Carrier 26VNA1 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Compressor to ground, heat sink, supply voltage. Weigh-in vs nameplate.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. These L-codes do not exist on 24ACC6. If you are looking at a contactor, you are on the wrong outdoor.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

Workflows

26VNA1 charge / silent

After a repair or a no-cool on a 26-series Infinity.

  1. 1 Prove the call and the live code

    Confirm R-454B on the plate. Recover with an A2L-capable machine.

    Expect: Write whatever Infinity inverter · R-454B is showing. Infinity last 10.

    If fail: No call at the IFC → stat / harness. Do not change gas parts.

  2. 2 Isolate the first failed step in the sequence

    Weigh-in + line-set. Do not use 24VNA6 410A ounces.

    Expect: Protect: HPS / LPS / drive. No defrost.

  3. 3 Confirm with a number, then the next part

    Bus vs drive on the Infinity control — same fork as 24VNA6, different refrigerant.

    Expect: Charge: Recover and weigh. Nameplate + ounces/ft. Not piston SH. · ABCD: Communicating to the Infinity indoor / 59MN7 family. D is not Y.

    If fail: Stay on this plate. The out-of-range reading is the part.

    If pass: Reading in range → the next step in this workflow is the repair.

Test points

Charge

Recover and weigh. Nameplate + ounces/ft. Not piston SH.

ABCD

Communicating to the Infinity indoor / 59MN7 family. D is not Y.

Drive

Inverter LEDs / last fault. No contactor coil 24 VAC test.

Gotchas

  • 24VNA6 looks identical in the yard and is 410A.
  • 26TPA8 is two-stage R-454B, not this inverter.

Related plates

Install this plate

Install Carrier 26VNA1 as Infinity inverter AC · Puron Advance (R-454B).

Infinity inverter AC · Puron Advance (R-454B)

This plate — not the sister SKU

  • Not 24VNA6 (R-410A Infinity inverter). Not 25VNA4 (HP). Not 26TPA8 (two-stage R-454B). Not 26SCA5 (Comfort contactor).
  • 24VNA6 looks identical in the yard and is 410A.
  • 26TPA8 is two-stage R-454B, not this inverter.

Control on this outdoor

  • Infinity events + outdoor drive.
  • Nameplate R-454B. A 410A 24VNA6 charge chart is the wrong book.
  • No defrost — AC only.

Hardware

  • Refrigerant: R-454B Puron Advance (A2L)
  • Drive: Inverter scroll · Infinity ABCD
  • Charge: Weigh-in on an R-454B machine + line-set

First fire

  1. 1Confirm R-454B on the plate. Recover with an A2L-capable machine.
  2. 2Weigh-in + line-set. Do not use 24VNA6 410A ounces.
  3. 3Bus vs drive on the Infinity control — same fork as 24VNA6, different refrigerant.

Do not on Carrier 26VNA1

  • Not 24VNA6 (R-410A Infinity inverter). Not 25VNA4 (HP). Not 26TPA8 (two-stage R-454B). Not 26SCA5 (Comfort contactor).
  • 24VNA6 looks identical in the yard and is 410A.
  • 26TPA8 is two-stage R-454B, not this inverter.

Maker literature

FieldBench does not host manufacturer files. Each link opens the maker’s own literature page in a new tab.

  • Carrier residential furnacesLiterature searchProduct pages carry current literature. I/O booklets are typically HVACpartners / dealer.Open manufacturer PDF
  • Carrier HVAC resourcesLiterature searchOwner-facing literature hub. Do not invent a 59-series I/O URL.Open manufacturer PDF
  • Carrier residential furnacesLiterature searchSearch Carrier 26VNA1 on the maker’s literature page.Open manufacturer PDF

Warranty and bulletins

Affected models, serial range, symptom, remedy, date. Maker files open on the manufacturer site.

All bulletins

  • Residential limited warranty

    warranty sheet

    Carrier / Bryant registered heat-exchanger terms

    Current 59-series / Evolution / Preferred registered warranty · Limited warranty certificate

    Open factsOpen manufacturer PDF

  • Dealer portals

    dealer

    Where remaining service letters live

    Current-year service letters not on a public literature page · Maker dealer portal

    Open factsOpen manufacturer PDF