Page 188 of 250 Replacing equipment553-3001-520 Standard 17.00 January 20024 Grasp the lip at the top edge of the blower unit. Slide the unit out of theglides and onto the bottom ledge of the pedestal. Lift the unit out of thepedestal.Note: Store the blower unit in an upright position.Installing equipment1 Set the replacement blower unit on the bottom ledge of the pedestal.2 Tilt the back of the blower unit up slightly so it will slide into the pedestalglides (you may need to lift the unit). Gently push the unit into position.3 Tighten the screws on the front of the unit.4 Turn on power to the blower unit:— With AC power, set the circuit breaker to ON (up).— With DC power, set the toggle switch to ON (right).Note: On initial power up the blower may rotate slower than expected.As the sensor detects heat, the blower will rotate more rapidly.5 Fit the grill into the holes in the bottom ledge of the pedestal. Push thegrill back into a locked position.6 Tag defective equipment with a description of the problem andpackage it for return to a repair center.NT8D53CA Power Distribution Unit ACUse this procedure to replace the power distribution unit (PDU) forAC-powered systems.Removing equipment1 Turn off power at the distribution box. If the column is not hardwired,unplug the power cable.2 Remove the grill on the rear of the pedestal. Figure 29 on page 189shows the location of the unit in the rear of the pedestal.DANGERModule covers are not hinged; do not let go of thecover. Lift the cover away from the module and set itout of your work area.
