Daikin Air Handling Unit OAH085GHAM

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

If the coil is dirty, proceed with the following steps

Use a chemical coil cleaner on multiple row coils

Enter the name of the chemical cleaner used

I have read and followed the chemical cleaner’s instructions

Warning: Some cleaners may contain harsh chemicals. Use with caution.

Check for any damage to fins while cleaning

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.)

Drain pans in any air conditioning unit may have some moisture

Algae, etc., can grow due to airborne spores and bacteria

Periodic cleaning is necessary to prevent this buildup from plugging the drain and causing the drain pan to overflow

Keep the drain pans clean to prevent the spread of disease

Cleaning should be performed by qualified personnel;

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

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.

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. Inspect V-drive on a periodic basis.

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

Tension Measurement Procedure: Measure the belt span. See Figure 105. Place belt tension checker squarely on one belt at the center of the belt span. Apply force to the checker, perpendicular to the belt span, until the belt deflection equals belt span distance divided by 64. Determine the force applied while in this position.

Enter the force applied to the belt

Compare this force to the values in Table 47.

Sign off on the Fan Drive Belt Adjustment