Thoreson-McCosh Industrial Dryer TD-90

Ensure the unit is powered off before starting the check

Verify that the Blower Rotation Alarm is installed on the dryer

Is the Blower Rotation Alarm activated?

Is the alarm light on and message displayed on the digital readout?

Manual Rotation Check (if no alarm)

Remove the side panel of the dryer

Is the process blower motor rotating clockwise?

Record amp draw of blower motors

Refer to wiring diagram, insert, and individual motor nameplate for specifications

Dew Point and Air Leak Inspection

Enter the process dew point (max. = −40°F)

Is the process dew point within the acceptable range?

Read instructions completely before attempting to remove the beds.

Set Off/Auto/On switch to On, Set key switch to 'Adjust Setpoints'.

Follow the procedure in Section 8.2 'Forcing a Bed Index'. When the beds are clear of the manifolds, remove power from the dryer.

Loosen the band clamps that hold the bed tight up against the turret plates, and remove the bed from the unit. Remove the band clamps.

Apply power and repeat the previous steps until all the beds have been removed.

Ensure the unit is powered off before starting the procedure.

Verify that the Blower Rotation Alarm is present on the unit.

Blower Motor Rotation Verification

Is the Blower Rotation Alarm activated?

Is the blower motor rotating clockwise?

If the blower motor is not rotating clockwise, reverse any two of the three incoming power leads to the terminal block.

Do not swap the power leads at the blower itself.