Engineered Air HVAC Unit HE221/O

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

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

Is the unit operating 24 hours?

Lubricate with multipurpose roller bearing NLGI No. 2

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

Adjust lubrication frequency based on condition of purged grease

Lubricate bearings prior to extended shutdown or storage

Rotate shaft monthly to aid corrosion protection

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.

Refer to motor manufacturer for lubrication recommendations

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

Select motor lubrication interval based on service hours

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

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

Ensure torque for Dodge SC 203-215 series 3/4” shaft is between 66-80 in-lb (7.5-9 Nm)

Ensure torque for Dodge SC 203-215 series 1”, 1 3/16”, 1 7/16” shaft is between 126-156 in-lb (14-18 Nm)