Daikin Air Handling Unit OAH008GHAM

Warning: Disconnect and lock electrical power source before starting the procedure

Check tightness of all bearing, wheel, and sheave setscrews (or capscrews)

Refer to Table 28 on page 42 for more details

Recheck belt tension and adjust if necessary

Belts that are tensioned sufficiently to slip one to two seconds at startup perform satisfactorily, extending life and reducing vibration

If re-tensioning is necessary, be certain to retain sheave alignment

Sign off on the 48 Hours Air Handling Unit Check

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 II 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 re-greaseable. Larger frame size TECO motors are re-greaseable 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.

Table 43: Recommended Lubricants and Amounts for Fan Motor Bearings

NEMA Size 56 to 140: Amount to Add (oz.)

NEMA Size 140: Amount to Add (oz.)

NEMA Size 180: Amount to Add (oz.)

Clean drain pan regularly so mold does not develop

Coils can freeze due to air stratification or failure of outdoor air dampers and/or preheat controls

Do not depend on routine draining of water cooling coils for winter shutdown as insurance against freeze-up

Drain all coils as thoroughly as possible and then treat in the following manner

• Fill each coil independently with an antifreeze solution using a small circulating pump and again thoroughly drain

Warning: Cleaning should be performed by qualified personnel

If the drain pan is overflowing, report the issue to the maintenance team and stop the procedure

Drain pan cleaned successfully?

Upload a photo of the cleaned drain pan

Sign off on the drain pans cleaning

WARNING: Moving belt and fan can cause severe personal injury or death. During installation and filter maintenance: Verify that the belt and fan guards on plenum fan units are always in place. Lock and tag out fans to prevent accidental start up. Do not enter the filter compartment until the fan is completely stopped. Use approved equipment for reaching filters located above normal reach. Do not step on filter frames or unit components. Floor surfaces must be dry and free of oil or grease.

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

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