Daikin Air Handling Unit OAH015GHAM

WARNING: Mold can cause personal injury. 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. Severe coil damage can result.

Drain all coils as thoroughly as possible.

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

Check freezing point of antifreeze before proceeding to next coil.

Due to a small amount of water always remaining in each coil, there is a diluting effect. The small amount of antifreeze solution remaining in the coil must always be concentrated enough to prevent freeze-up.

NOTE: Carefully read instructions for mixing antifreeze solution used. Some products have a higher freezing point in their natural state when mixed with water.

Daikin Applied is not responsible for the freezing of coils.

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

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

All electrical connections checked and snug

Signs of water damage such as corrosion inspected

Ground conductor and connection integrity checked

Sign off on the electrical system check

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

Filters removed from inside the unit

Prefilter and final filter released

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Filters fully seated in the frame

Upload a photo of the installed filters