Engineered Air HVAC Unit HE40

Determine filter-changing intervals based on

Enter the scheduled interval for filter changes (in months)

Is the unit operating with high levels of outside air?

Is the area experiencing heavy frost or snow?

Remove or relocate filters during winter months if necessary

Check for plugged or excessively dirty filters

Record filter quantities, sizes, and types from submittal record

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

Select shaft diameter and speed (RPM) for lubrication schedule

Record the suggested re-lubrication interval based on shaft diameter and speed (RPM)

Is it safe to re-lubricate while running?

Re-lubricate until some purging occurs at seals

Adjust lubrication frequency based on condition of purged grease

Double the lubrication frequency for 24-hour operation

Refer to motor manufacturer for lubrication recommendations

Remove grease drain plugs and operate motor for 15 minutes before replacing plugs

Ensure not to over grease the motor

Select motor lubrication interval based on service hours per day

Check if motor runs in severe conditions and grease as specified by the manufacturer

De-energize the control system.

Close the upstream manual gas valve.

Connect a ¼” (6mm) tube to the outlet pressure tap on the safety shutoff valve.

Immerse the opposite end of the ¼” (6mm) tube vertically ½” (13mm) into a clear container of water.

Count the number of bubbles appearing during a 10 second period.

Is the bubble rate greater than that noted in the manufacturer’s table?

If the bubble rate is greater than noted, choose the action taken

If bubble rate is less than noted in the table, remove the ¼” (6mm) tube, reconnect the outlet pressure tap plug.

Check set screws on fan wheel for looseness

Check set screws on fan bearings for looseness

Check set screws on fan pulley for looseness

Check set screws on motor pulley for looseness

Tighten set screws where required