Daikin Air Handling Unit OAH050GHAM

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

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

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

Filters removed from inside the unit

Prefilter and final filter released

Upload a photo of the removed filters

Filters fully seated in the frame

Upload a photo of the installed filters

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.

CAUTION: For safety, stop rotating equipment

Did you add one half of the recommended amount shown in Table 43?

Start bearing, and run for a few minutes

Did you stop bearing and add the second half of the recommended amount?

A temperature rise, sometimes 30°F (1°C), after re-lubrication is normal

Enter the operating temperature of the bearing

Bearing should not exceed 225°F (107°C) for intermittent operation

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