Engineered Air HVAC Unit HE60

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 for looseness on the shaft

Tighten loose set screws where required

Record any issues or observations

Remove any scale from the burner plates

Ensure that the holes on the burner plates and gas orifices are clear of foreign material

Verify orifice sizes on tee casting

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

Determine lubrication interval based on shaft diameter and speed (RPM)

Is the unit operating 24 hours?

Lubricate with multipurpose roller bearing NLGI No. 2

Re-lubricate while running until purging occurs at seals

Adjust lubrication frequency based on purged grease condition

Lubricate bearings prior to extended shutdown or storage

Rotate shaft monthly to aid corrosion protection

Check the condition of the filters

Is the filter due for replacement based on the schedule or condition?

Replace the filter if necessary

Record the date of filter inspection and replacement in the maintenance log