Engineered Air HVAC Unit DJ140/HRP

Lubrication of Dodge Fan Bearings — Spherical Roller Bearing, Solid Pillow Block

Select shaft diameter and speed (RPM) for lubrication schedule

Select lubrication interval based on RPM

Is the unit operating 24 hours?

Lubricate with multipurpose roller bearing NLGI No. 2

Re-lubricate while running until purging occurs at seals, if safety permits

Adjust lubrication frequency based on purged grease condition

Lubricate bearings prior to extended shutdown or storage

Rotate shaft monthly to aid corrosion protection

Determine filter-changing intervals based on

Enter the scheduled interval in months

Does the unit operate with high levels of outside air?

Check for plugged or excessively dirty filters

Verify filter quantities, sizes, and types from submittal record

Use same size and type for replacement

Check and clean High Velocity Permanent filters

Check set screws for looseness on the shaft

Tighten set screws where required

Record any issues found during the check

Enter torque applied to set screws (in-lb)

Was the torque applied within the specified range for the shaft diameter?

Refer to bearing manufacturers’ literature for other types of bearings

Inspect coils and drain pans for cleanliness and biological growth

Clean the external surface of finned coils using a low pressure water spray and a brush

Ensure no high pressure steam or water is used for cleaning

Verify cleaning additives or solutions are compatible with coil materials or coatings

Use a fin comb to straighten any damaged or bent fins

Drain and blow out water coils with compressed air

Fill and drain coils several times with appropriate strength pre-mixed inhibited HVAC glycol or other suitable fluid

Check set screws on fan wheel for looseness

Check set screws on fan bearings for looseness

Check set screws on fan pulleys for looseness

Check set screws on motor pulleys for looseness

Tighten set screws where required

Refer to Table I for bearing setscrew torques