Carrier 38TDB Instrukcja Naprawy Pobierz pdf (Strona 15)

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

10-12-2006

Checking Airflow, Static Pressure and RPM in the Service Menu

• The airflow displayed in the Service screen is requested airflow, not actual airflow.

• The static pressure displayed in the Service Screen is calculated based on requested

airflow, RPM and known system characteristics.

• The RPM displayed in the Service screen is actual RPM.

• Accuracy of static pressure readings is limited on some furnaces when RPM reaches

1100

RPM data can be used as an indicator of restrictive ductwork. When RPM maxes out, the Blower

Cutback flag is communicated to the furnace or fan coil control. This begins the Blower Cutback

algorithm which protects the motor from running at extreme conditions. The cutback algorithm is

explained in this document in the description of the EXCESS STATIC PRESSURE system

event.

Most furnaces and fan coils will deliver the requested airflow up to the maximum RPM. When a

system is not able to deliver the requested CFM at high static pressures, the accuracy of the

static pressure calculation is limited. See airflow information in Product Data to determine airflow

performance.

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Carrier 38TDB Instrukcja Naprawy Strona 15