Greenheck Warehouse Make Up Air Unit DGX-120

Repair and replacement of the coil and the connecting piping, valves, etc., must be performed by a qualified individual

Inspect the coil for signs of corrosion and/or leaks

Inspect the coil’s surface for foreign material. If the coil surface needs cleaning, clean the coil from the leaving air-side so that foreign material will be washed out of the coil rather than pushed farther in

Inspect and clean the drain pan to prevent the growth of algae and other organisms

Be sure to read and follow the coil manufacturer’s recommendations before using any cleaning fluid

Caution must be used to avoid injury when venting the coil

High pressure and/or high temperature fluids can cause serious injuries

Sign off on the cooling coil maintenance

Warning: Ensure the fan is turned off and disconnected from power before starting the procedure.

Check if the fan bearings match the maximum load and operating conditions.

Check if the fan has been stored for more than three months.

If the fan has been stored for more than three months, follow the next steps.

Purge the bearings with new grease.

Sign off on the fan bearing lubrication procedure.

Warning: Ensure the burner is turned off and cooled down before starting the maintenance.

Inspect the burner for accumulation of scale on both the upstream and downstream sides of the mixing plates.

Remove foreign material with a wire brush.

Visually check that all holes in the mixing plates are clear.

If any burner ports are plugged (even partially), clear them with a piece of wire or another appropriate tool. Do not enlarge burner ports when clearing a blockage as performance could be affected.

Replace or tighten any loose or missing fasteners on the mixing plates.

Always use appropriate fasteners.

Inspect and clean the flame rod or UV scanner.

Occasional replacement of the flame rod and spark rod may be necessary to ensure optimum unit performance.

Test the circulating fluid for sediment, corrosive products and biological contaminants

Describe the corrective measures taken if any contaminants were found

Maintain adequate fluid velocities and proper filtering of the fluid

Are automatic air vents utilized?

If automatic air vents are not utilized, periodic venting of the coil is recommended to remove accumulated air

Sign off on the chilled water coil maintenance

Is the media brushed lightly with a soft bristle brush while flushing with water?

Is the amount of mineral build-up reduced?

Is there a large amount of mineral build-up?

If yes, clean or replace the media and increase the water bleed-off or drain and fill rate.

Is the cooling media within its useful life of 3 to 5 years?

Is the evaporative media installed correctly after reinstallation?

Is the replacement media from the same manufacturer and the same size as the original media?

Sign off on the evaporative cooling module maintenance