Engineered Air HVAC Unit HE171/O

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 there heavy frost or snow in the area?

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

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 the motor lubrication interval based on service hours per day

Specify greasing instructions for motors running in severe conditions as per 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.

Outdoor Air Intakes, Mixing Sections and Dampers

Check cleanliness of outdoor air intakes, screens, and adjacent areas

Inspect integrity of outdoor air intakes, screens, and adjacent areas

Verify proper operation of outdoor air intakes, screens, and adjacent areas

Remove tie-down bolts, straps and blocks

Set all associated electrical switches, controls, thermostats and main disconnect switch to 'OFF' position.

Close all manual valves and field piping valves.

Confirm that all shipping materials have been removed.

Check all bearings, drive and fan set screws for tightness.

Check drive alignment and belt tension.

Inspect all electrical wiring for loose connections.