Engineered Air HVAC Unit HE70

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 if the fan has permanently lubricated sealed ball bearings

Ensure bearings are factory packed 30 to 50% full

Grease bearings that require lubrication while rotating slowly

Use lithium base lubricant only

Check for extended lubrication lines

Ensure tubing is not factory filled

Select shaft diameter for grease quantity

Inspect the burner for any scale accumulation

Remove any scale from the burner plates

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

Verify the size of the first 2 orifices on the tee casting are #45

Verify the size of all other casting orifices are #42

Check the current position of the slide damper

Adjust the slide damper for seasonal operation

Verify the damper is securely positioned

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

Recommended Motor Lubrication Intervals for motors up to 7.5 HP (5.6 kW)

For motors in severe conditions, grease as specified by the motor manufacturer