Written circuit landings: R to W closes on a heat call; verify 24V at W1. Outdoor: Y at the contactor. AR9T96 is W1/W2, not ComfortBridge 1/2. 987M is ABCD, not 926T. Maker schematics open on the manufacturer site — FieldBench does not redraw them.
8 furnace landings · 24 landings · 155 plates
Furnace · single-stage 24V
R / C / W / Y / G
Conventional single-stage furnace IFC. One W. Cool Y passes through to the outdoor. No ComfortBridge, no ABCD, no W2.
AR9S96 · AR9S80 · AM9S96 · GR9S96 · GR9S80 · GMSS96 · +33
Furnace · two-stage 24V
R / C / W1 / W2 / Y / G
Two-stage conventional furnace. W1 low fire, W2 high fire. Outdoor staging is Y or Y1/Y2 — separate from the gas valve.
AR9T96 · AR9T80 · GR9T96 · GR9T80 · GMEC96 · 926T · +15
ComfortBridge / ComfortNet furnace
1 / 2 data — or 24V
Goodman / Amana / Daikin communicating two-stage. Outdoor on 1 and 2 when the outdoor talks. A 24V GSX16 still wants Y, not data.
AMVC96 · ARVT96 · ARVT80 · GMVC96 · GRVT80 · GMVC80 · +2
ComfortBridge modulating furnace
1 / 2 · percent fire
AMVM97 / GMVM97 / ARVM97 / DM97MC. Same 1/2 pair as two-stage ComfortBridge. Capacity is 0–100%, not W1/W2.
AMVM97 · ARVM97 · GMVM97 · GRVM97 · DM97MC
Infinity / Evolution furnace
ABCD
59MN7 / 59TN6 / 987M / 986T class. Four-wire communicating furnace. D is 24V hot, not W and not Y.
59MN7 · 59TN6 · 59TN7 · 58CVA · 987M · 986T · +4
ComfortLink furnace
ComfortLink data pair
Trane XC95m / XC80 / XL95 class. Communicating indoor. S9V2 is 24V CoF/Ht1 — different diagram.
XC95m · XC80 · XL95
iComfort furnace
I+ / I−
SLP99V / SL297NV / EL296V communicating. iComfort S30/S40 on I+ and I−. Many EL296V jobs are still 24V — use that landing if RS wires are empty.
EL296V · SLP99V · SL297NV
EcoNet furnace
E1 / E2 — or 24V
Rheem / Ruud R96V / R98V / R98MV / R972V / R801V. EcoNet on E1/E2. R96TA / R801S stay on the 24V furnace diagram.
R96VA · R98V · R98MV · R972V · R951V · R801V · +1
Single-stage 24V contactor
Conventional Y / C
One cool stage. Indoor transformer, stat Y, outdoor contactor coil. Dual cap on the outdoor. No data pair and no Y2.
GSX16 · ASX16 · 24ACC6 · 24SPA6 · 146SAN · 135SAN · +14
Two-stage 24V · Y1 / Y2
Conventional Y1 / Y2 / C
Two-stage scroll. High stage is Y2 at the outdoor. A single-stage stat never gets you there. Still not Infinity ABCD.
GLXT7C · ALXT7C · 24TPA7 · 26TPA8 · 148TAN · XR17 · +8
Infinity / Evolution inverter AC
ABCD
Four-wire communicating inverter air conditioner. Capacity is serial. No contactor, no dual cap, no reversing valve, no defrost.
24VNA6 · 26VNA1 · 191VAN
Evolution two-stage · ABCD
ABCD (two-stage scroll, not inverter)
Bryant 187B class. Evolution communicating two-stage. ABCD like 191VAN — but there is no inverter drive and no Y1/Y2 Preferred landing.
187B
ComfortBridge two-stage outdoor
1/2 data — or 24V Y1/Y2
Goodman GSXC / Amana ASXC class. Talks ComfortBridge on 1 and 2 when the indoor is GMVC / AMVC / AVPTC. On a 9-speed 24V indoor it is just Y1/Y2.
GSXC18 · ASXC18 · GSZC18
ComfortBridge inverter AC
1/2 data — or 24V Y
GXV9S / AXV9S / GSXV class. Outdoor drive, no reversing valve. Communicating indoor on 1/2. 24V indoor gets Y and C only.
GXV9S · AXV9S
ComfortLink / AccuLink inverter AC
ComfortLink data pair
Trane / American Standard XV18 class. Communicating inverter air conditioner. Not XR16 Y/C. Not XV20i (that outdoor has a reversing valve).
XV18 · XV20i
iComfort variable AC
I+ / I−
Lennox EL18XCV / SL28XCV. iComfort S30/S40 on I+ and I−. EL18XC1 is Y1/Y2 two-stage — different diagram.
EL18XCV · SL28XCV
EcoNet inverter AC
E1 / E2
Rheem / Ruud RA19AY Prestige. EcoNet on E1 and E2. RA14AZ / RA16 / RA17 are 24V — different diagrams.
RA19AY
York Affinity inverter AC
Affinity / Hx communicating pair
York YXV. Affinity communicating inverter. YC2E / YC2F are 24V LX. YXT is two-stage, not this drive.
YXV
Daikin FIT / ComfortNet inverter AC
P1 / P2
DC9VS / DC6VS / DX17VSS FIT. P1/P2 indoor–outdoor. DX16TC / DX13SA / DC5SE are 24V — different diagrams.
DC9VS · DZ20VC
Infinity / Evolution inverter HP
ABCD + RV / defrost on the drive
25VNA4 / 280ANV. Same ABCD as 24VNA6 — plus a reversing valve and defrost on the outdoor drive.
25VNA4 · 280ANV
Single-stage HP · Y + O/B
24V Y / C / O or B
GSZ14 class. Contactor + dual cap + defrost board + reversing valve. O/B direction is board-specific — do not assume Carrier O-on-cool.
GSZ14
Mitsubishi M / MXZ · S1 S2 S3
S1 / S2 / S3
M-series wall and MXZ multi-zone. S1/S2 power, S2/S3 comm on most M-series. Not Daikin P1/P2 and not 24V thermostat cable.
MSZ-FS · MSZ-GL · MXZ-SM
Bosch BOVA / IDS
Comm cable + 24V at the AHU
BOVA 2.0 inverter HP. Communicating cable indoor–outdoor. Conventional 24V stat typically at the air handler (Y / B / G / W / C).
BOVA 2.0