York Rooftop Unit Y12CC04C1LABAB

Is the unit equipped with power exhaust fans or a return air fan?

Belt Tension Adjustment Procedure

Loosen the four bolts holding the motor base to the channels

Adjust the belt by turning nuts 'A' (see detail 'B')

Apply a perpendicular force to one belt at the midpoint of the span using a belt tension checker

Enter the deflection distance obtained (in inches)

Select the fan type and motor horsepower

Ensure power is disconnected from the unit before maintenance

Do not attempt to lubricate bearings with the unit in operation

Switch the bypass VFD manually on the front of the bypass enclosure in the fan cabinet

Set the ON/OFF rotary power switch to ON

Set the BYPASS/OFF/DRIVE switch S1 to DRIVE

Set the HAND/STOP/AUTO switch S2 to AUTO

Set the TEST/NORMAL switch S3 to NORMAL

Label all wires prior to disconnection

Filter Inspection and Replacement

Is the dimensional size of the replacement filter the same as the replaced filter?

Verify proper operation after servicing

Label all wires prior to disconnection

Verify that outdoor fan motors are permanently lubricated

Is lubrication desired for outdoor fan motors?

Verify that vendor motors are factory lubricated for 10-year life

Verify proper operation after servicing

Ensure power is disconnected from the unit

Do not lubricate bearings with the unit in operation

Check motor for accumulations of dust blocking cooling slots

Check for loose, damaged, or misaligned drive components

Check that all mounting bolts are tight

List any defective parts that need replacement