Daikin Air Handling Unit OAH021GHAM

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

Warning: Ensure the unit is turned off before starting the procedure

Filters removed from inside the unit

Prefilter and final filter released

Filters fully seated in the frame

Warning: Cleaning should be performed by qualified personnel

Upload a photo of the drain pan before cleaning

Is there any algae or bacteria growth?

Upload a photo of the drain pan after cleaning

Sign off on the drain pans cleaning

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

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