Carrier Packaged and Dedicated Outdoor Air Units 50TC

Outdoor hood inlet filters cleaned

Fan shaft bearing locking collar tightness checked

Condenser coil cleanliness checked

Sign off on the 3 Monthly Inspection

Shut off the unit power supply and apply the appropriate lockout/tagout procedures

Remove the condenser-fan assembly (grille, motor, and fan)

Upload a photo of the adjusted fan height as shown in Fig. 32

Replace the condenser-fan assembly

Sign off on the condenser-fan adjustment

Loosen the four motor mounting nuts that attach the motor to the blower rail

Loosen the two jack bolt locking nuts beneath the motor mounting plate. Turn the jack bolt locking nut counterclockwise to loosen

Turn the jack bolts counterclockwise to loosen and clockwise to tighten

Adjust the V-belt for proper tension

Make sure the fan shaft and motor shaft are parallel before tightening the motor mount nuts

Tighten the four motor mounting nuts

Check the V-belt tension. Make adjustments as necessary

Re-tighten the four motor mounting nuts

Shut off the main unit power supply, and use the approved lockout/tag-out procedures.

Loosen the belt by loosening the motor adjustment bolts as described in the Belt Adjustment section.

Loosen the movable pulley flange setscrew.

Warning: Increasing fan speed increases load on the motor. Do not exceed maximum speed specified in the Product Data or motor amperage listed on the unit rating plate.

Set the movable flange at the nearest keyway or flat of the pulley hub and tighten the setscrew to torque of 72 ± 5 in.-lb (8.14 ± 0.56 Nm).

Sign off on the fan speed change

Warning: This procedure requires trained personnel with PPE!

Connect service gages to suction and discharge pressure fittings

Check if suction pressure drops and discharge pressure rises

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

Check if the evaporator fan is rotating in the wrong direction

Turn off power to the unit. Use applicable lockout/tag-out procedures

Reverse any two of the unit power leads

Reapply power to the compressor