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.
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 PDFComfortBridge indoor
GMVC96 / AMVC96 / AVPTC / ARVT96 on the data pair.
CoolCloud / communicating control
Menus live on the indoor. Do not land R/C on 1 and 2.
- 1DataData
- 2DataData
Communicating indoor
One master on the bus. 1/2 polarity matters.
- 1DataData
- 2DataData
- R24V for accessories24V
- CCommon24V
ComfortBridge pair
Indoor 1 and 2 to outdoor 1 and 2. Polarity matters. This is not 24V Y.
- 1DataData
- 2DataData
Outdoor line
208/230 through the disconnect to the contactor line side.
- L1LineLine
- L2LineLine
- GNDEquipment groundLine
Landing
- DataIndoor 1outdoor 1 · indoor 2outdoor 2
Data. Not 24 VAC.
- LineL1 / L2outdoor
208/230
24V indoor (GR9 / AR9 / GMEC)
9-speed or CT indoor. No ComfortBridge menus.
Wall thermostat
Two-stage cool. A single-Y stat never pulls high.
- R24V hot24V
- C24V common24V
- Y1Low-stage cool24V
- Y2High-stage cool24V
- GIndoor fan24V
- WHeat. Stays at the indoor.24V
Indoor IFC / AHU
Y1 and Y2 both have to leave this cabinet on high.
- RTransformer hot24V
- CCommon — run it to the outdoor24V
- Y1Low-stage in / out24V
- Y2High-stage in / out24V
- GBlower24V
- W1Heat24V
Outdoor — Y1 / Y2
Low vs high is these two screws, not an inverter L-code.
- Y1Low-stage request24V
- Y2High-stage request24V
- C24V common24V
Outdoor line
208/230 through the disconnect to the contactor line side.
- L1LineLine
- L2LineLine
- GNDEquipment groundLine
Landing
- 24VStat Y1/Y2/Cindooroutdoor Y1/Y2/C
~24 VAC. Data wire is a miswire.
Prove it
- Identify the indoor first. Communicating indoor = 1/2. 24V indoor = Y1/Y2.
- Comm faults are invalid on a 24V hookup.
Do not
- Do not land data wire on a GR9T96 / AR9T96 / GR9S96.
- Do not apply this to GSX16 / GLXS4B or GXV9S / AXV9S.
1 and 2 are the published ComfortBridge pair.