Daikin Air Handler CAH009GHAM

Filters removed from inside the unit

Wire clips rotated to release filters

Clean filters fully seated in the frame

Pressure drop for installed filters

Typical filter pressure drop for clean filters at rated air flow

Final pressure drop for front loaded filters

Prefilters removed to check the pressure drop of the final filters

Adjust motor base forward to release belt tension

Remove the belts for easier adjustment

Loosen, but do not remove both of the locking setscrews A in the outer locking ring by using a hex key or torque wrench with a hex bit

Adjust sheave to desired pitch diameter by turning the outer locking ring, using a spanner wrench or drift inserted into the three holes that are located 120° apart on the ring

Ensure pitch diameter is within the sheave range. One complete turn of the outer locking ring changes the pitch diameter 0.233

Tighten BOTH locking screws A in the outer locking ring before operating the drive. Use a torque wrench and tighten to the value

Replace belts and adjust the motor base to tension the belts properly

Ensure no screws other than the two locking screws A in the outer locking ring are loosened when adjusting the sheave pitch. Do not operate the drive until the locking screws have been set to the torque specifications

Warning: Moving belt and fan can cause severe personal injury or death. Always use approved equipment and ensure floor surfaces are dry and free of oil or grease.

General Rules of Tensioning: The ideal tension is the lowest tension at which the belt does not slip under peak load conditions. Check tension frequently during the first 24 to 48 hours of operation. Over tensioning shortens belt and bearing life. Keep belts free from foreign material that can cause slippage.

Is the belt free from foreign material that can cause slippage?

Measure the force applied to the belt tension checker

Does the measured force match the ideal values?

Inspect V-drive on a periodic basis. Adjust tension if the belt is slipping. Do not apply belt dressing. This can damage the belt and cause early failure.

Is the belt and fan guards on plenum fan units in place?

Is the fan locked and tagged out to prevent accidental start up?

Belt tension slacked off if belts have been installed

Capscrews E loosened but not removed

Pitch diameter adjusted by opening or closing the movable flanges by half or full turns

Setscrews D and capscrews E tightened

Belt tension readjusted if belts have been installed, or belts installed and tension adjusted if not previously installed

All keys are in place and all setscrews and all capscrews are tight before starting the drive

Check all moving parts for wear

Check bearing collar, sheave, and wheel hub setscrews, sheave capscrews, and bearing hold-down bolts for tightness

Annually check and snug all electrical connections

Inspect for signs of water damage such as corrosion and repair if necessary

Check ground conductor and connection integrity and correct if needed