Carrier 38TDB Guía para resolver problemas descargar pdf (Pagina 22)

Software Revs 3,5,6,8,10, 12 Infinity /Evolution Troubleshooting (Rev. 2)

10-12-2006

TABLE 1

Advance Troubleshooting

Fan Coil / Furnace / 2-stage Communication Bus

FE Control Board

Furnace Control Board

Two-Speed Control Board

-Voltage Readings -

With board Power applied, and No U.I. connected, all other devices disconnected

A to B ~3 vdc

A to C ~3 vdc

B to C ~.01 to 0.3 vdc

C to D 24 vac

The above readings are meant to prove that the communication driver is not dead or shorted.

It does not guarantee that the unit will communicate. If communication problems exist and

voltage read good, an external short in the thermostat wiring, or a mis-applied accessory

may be the cause.

-Voltage Readings -

With board Power applied, and U.I. Applied, all other devices disconnected

A to B ~2.5 to 3.9 vdc (pulsating)

A to C ~2.5 to 3.9 vdc (pulsating)

B to C ~0.1 to 0.9 vdc (pulsating)

C to D 24 vac

The above readings are meant to prove the communication drivers are functioning, are not

open or shorted, and wiring between devices is OK. If voltages check out OK and

communication problems still exist, it could be a board problem.

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Carrier 38TDB Guía para resolver problemas Pagina 22