Daikin Air Handler OAH009GDGM

Warning: Moving belt and fan can cause severe personal injury or death. Always ensure safety measures are in place.

Is the belt tension at the lowest tension at which the belt does not slip under peak load conditions?

Force applied to the belt tension checker

Does the force applied match the required values?

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

Is the V-drive inspected and adjusted if necessary?

Warning: Do not apply belt dressing. This can damage the belt and cause early failure.

Are the belt and fan guards on plenum fan units always in place?

WARNING: Before servicing fans, lock out and tag out all power to the unit. Fans or belts can cause severe personal injury or death

WARNING: Do not open the hinged access door and screw-fastenerd access panels while the unit is operating. Moving parts and strong suction forces can cause severe personal injury or death

Replace the variable pitched motor sheave with a properly sized, fixed sheave

Replace the adjustable sheaves with fixed sheaves

Measure the diameter of the V-belt outer surface where it passes around the sheave (pitch diameter)

Calculate fan speed from the motor nameplate rpm

Sign off on the fan drive maintenance

CAUTION: Bearing overheating potential. Can damage the equipment. Do not over lubricate bearings. Use only a high grade mineral grease with a 200°F safe operating temperature.

Motor Bearings: Supply and return fans-Supply and return fan motors should have grease added after every 2000 hours of operation.

Using the following procedure, re-lubricate the bearings while the motor is warm, but not running

NOTE: Direct-Drive Class Il fans that are supplied with TECO motors have double shielded bearings on frame sizes 140T-280T. These bearings are pre-packed with a long life grease and are not regreaseable. Larger frame size TECO motors are regreaseable and follow the same lubrication recommendations as all other motors

NOTE: Specific greasing instructions are located on a tag attached to the motor. If special lubrication instructions are on the motor, they supersede all other instructions

Recommended Lubricants and Amounts for Fan Motor Bearings

Warning: This procedure requires trained personnel with PPE!

Belt tension slacked off if belts have been installed

Capscrews E loosened but not removed

NOTE: This key projects a small amount providing a grip for removing

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

NOTE: Two-groove sheaves are supplied with both grooves set at the same pitch diameter. To provide the same pitch diameter for satisfactory operation, move both movable flanges the same number of turns. Do not open sheaves more than five turns for A belts or six turns for B belts

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\" 6"

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

Do not loosen any screws other than the two locking screws A in the outer locking ring when adjusting the sheave pitch. Do not operate the drive until the locking screws have been set to the torque specifications

Sign off on the MVP Variable Speed Sheave Maintenance