Daikin Air Handling Unit OAH017GHAM

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.

Before servicing lock out and tag out all power to the unit

Fans or belts cause severe personal injury or death

Do not open the hinged access door and screw-fastened access panels while the unit is operating

Moving parts and strong suction forces can cause severe personal injury or death

Upon completion of the air balance, replace the variable pitched motor sheave with a properly sized, fixed sheave

A matching fixed sheave provides longer belt and bearing life and minimizes vibration

Disconnect and lock electrical power source

Check tightness of all bearing, wheel, and sheave setscrews (or capscrews). Refer to Table 28 on page 42

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

WARNING: Rotating fan can cause severe injury or death. Before servicing fans, lock out and tag out power

WARNING: Fire/electric shock hazard can cause property damage, personal injury or death. Wire fan power supply and ground motor frame in accordance with local electric codes

WARNING: Fan motor requires overload protection. Failure to provide motor overload protection can result in fire, property damage, electric shock, personal injury, or death. Connect motor to an overload protective device rated in compliance with local electric codes

CAUTION: Do not overheat fan motor. High air temperatures in the fan section can cause the fan motor to burn out. On draw-through air handlers or air handlers with the fan section down the air stream from the heating section, the discharge air temperature of the heating section must not exceed 104°F (40°C)

WARNING: Maximum operating altitude should not exceed 15,000 feet. When performing startup and service, always take thorough safety precautions. Only trained, experienced personnel should perform these functions

CAUTION: Equipment damage due to loose fasteners represents improper start-up and equipment abuse. It is not covered by the warranty. Before entering fan section, make sure that fan electrical power source is disconnected and locked in the OFF position

Check that the unit is completely and properly installed with ductwork connected

Check that construction debris is removed and filters are clean

Check that all electrical work is complete and properly terminated

Removing and Replacing Components

Before removing component, lock out and tag out all power to the unit

Fans and belts can cause severe personal injury or death

See page 12 for instructions on removing panels and opening fan access doors to remove or replace components

The fan shaft, motor, and any drive components can be removed and replaced through the access door opening

If required, the side panel can be removed for additional access

If fan replacement is required, the entire fan assembly can be pulled out the side of the cabinet for housed fan assemblies