Inducer Mechanical Fault

 

Cause: The safety circuit between S1 and S2 is open on the VFD.

 

     VSAD: The Motor High Limit or Fan High Limit or tilt Switch is open.

     VSUB: The Motor High Limit is open.

 

Solution: Varies; see below.

 

     VSAD: Check the continuity of the Motor High Limit, Fan High Limit

                 and Tilt Switch to determine which is open. If there is no

                 continuity for either of the limits or the switch, contact your

                 Tjernlund Products Representative for a replacement. If all

                 have continuity, verify that the wiring between the VFD and

                 the fan provides continuity. If continuity does not exist

                 between the VFD and fan, replace the existing wiring.

 

     VSUB: Check the continuity of the Motor High Limit to determine if it

                 is open. If there is no continuity, contact your Tjernlund

                 Products Representative for a replacement. If there is

                 continuity, verify that the wiring between the VFD and the fan

                 provides continuity. If continuity does not exist between the

                 VFD and fan, replace the existing wiring.

 

NOTE: When clearing the Fault History, if "unclearable" appears, ensure you have only the system activated for which you have on site.

 

i.e. If Combustion Air is activated but no combustion air system is present, the CPC-3 is looking for a safety circuit closure where no safety circuit is present. Deactivate Combustion Air and reset the CPC-3 to allow for Fault History to be cleared.